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Riverdale Park, Maryland Weather

Cicadas claim the afternoon. Day 15 of summer. Read this microseason across nine climate regions →

Riverdale Park weather forecast — hour by hour, 7-day outlook, NOAA radar

Riverdale Park, MD
Saturday, July 4 at 9:19 PM
84
°
Overcast
Feels like
90°
Humidity
62%
Wind
5 mph
Sunrise
1:47 AM
Sunset
4:36 PM
Riverdale Park, MD
Hour by hour · 24h
24-Hour ForecastRiverdale Park, MD: 24-hour forecast. Temperatures range from 78 to 98 degrees Fahrenheit with a 32% chance of precipitation at 8 PM.
L 78°H 98°
Riverdale Park, MD
7-day forecast
  1. Today
    Jul 4
    Overcast
    34%
    —
    102°82°—
  2. Sunday
    Jul 5
    Heavy Rain
    51%
    1.6″
    98°75°-4°
  3. Monday
    Jul 6
    Light Showers
    82%
    —
    86°75°-12°
  4. Tuesday
    Jul 7
    Thunderstorm
    82%
    0.01″
    80°72°-6°
  5. Wednesday
    Jul 8
    Light Drizzle
    37%
    0.02″
    79°69°-1°
  6. Thursday
    Jul 9
    Overcast
    13%
    —
    96°69°+17°
  7. Friday
    Jul 10
    Light Drizzle
    42%
    0.01″
    98°75°+2°
Riverdale Park, MD
Next 24 hours · Warm now
HOT 90°70°88°105°6p12a6a12pnow 85°high 98°low 78°PRECIP %
Riverdale Park, MD
Anemometer · 24h winds · from true
NESW
From · True
SW
216° · backing 89°
Direction
SW
216°
Sustained
5
mph
Gust
13
mph
Peak 24h
15
avg 3
Beaufort · 2 · LIGHT BRZ
0
CALM
<1
1
LIGHT AIR
1–3
2
LIGHT BRZ
4–7
3
GENTLE BRZ
8–12
4
MOD BRZ
13–18
5
FRESH BRZ
19–24
6
STRONG BRZ
25–31
7
NEAR GALE
32–38
24h · sust vs gust · mph
avg 3 · pk 15 @ 9:00p
01020MPHB1B2B3B4B5-21h-18h-15h-12h-9h-6h-3h-24hNOWpk 184SUSTGUST
−24h−18h−12h−6hnow
Light breeze backing 89° from the sw.
Riverdale Park, MD
Barometer · 24h pressure · mb
STORMRAINCHANGEFAIRDRY9901000101010201030
Pressure · mb
1012.7
+3.1 mb in 3h · rising rapidly · 29.91 inHg
Now
1012.7
mb
3h
+3.1
mb
12h
-1.7
mb
24h
-1.1
mb
Regime · CHANGE
STORM
RAIN
CHANGE
FAIR
DRY
24h · Pressure · mb
range 1010–1014
9951000STORM|RAIN10051010RAIN|CHG1015CHG|FAIR10201025FAIR|DRY1030-21h-18h-15h-12h-9h-6h-3h-24hNOW1014.41009.51012.6
−24h−18h−12h−6hnow
Pressure climbing through the change line — drier air pushing in.
Riverdale Park, MD
Air quality
111
AQI
Unhealthy for Sensitive Groups
↑+12 in 6h

AQI 111 (Unhealthy for Sensitive Groups), driven by PM2.5. AQI up 12 over the last 6 hours (gradual rise). PM2.5 at 12.5 µg/m³ (AQI 57) with a 0.95 fine-to-coarse ratio and 5 mph wind — combustion smoke trapped in calm air, not road dust.

CAUTION Sensitive groups (children, elderly, respiratory conditions) should limit prolonged outdoor exertion.

PM 2.5DRIVERModerate
12.5μg/m³
PM 10Good
13μg/m³
NO₂Good
11μg/m³
OzoneUnhealthy SG
105μg/m³
UV IndexLow
0.0

What's driving it

Ozone × UV × Sky

Ozone at AQI 50 now. With UV 0.0 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 9 around 1 PM.

Present
AQI 50
UV peak
0.0 at 1 PM
Sky at peak
partly cloudy
Projected peak
AQI 9

PM × Wind × Precip

PM2.5 at 12.5 µg/m³ (AQI 57) with a 0.95 fine-to-coarse ratio and 5 mph wind — combustion smoke trapped in calm air, not road dust.

PM2.5/PM10
0.95
Wind
light
Recent rain
0h in last 6h
Pattern
stagnant smoke

Trends

Seven days of AQI and PM2.5.

Hourly air-quality data from the Copernicus Atmosphere Monitoring Service, charted across the past and next several days. Dashed lines mark the AQI breakpoints at 50 (Good → Moderate) and 100 (Moderate → Unhealthy for Sensitive Groups).

7-DAY AQI TREND50100SUNMONTUEWEDTHUFRISATSUN7-DAY PM2.5 TREND · μg/m³320
Riverdale Park, MD
Sky cover · visibility · 24h
Cloud cover
100%
OVERCAST
100%0%−24h−18h−12h−6hnow
Visibility
56.5mi
UNLIMITED
115 mi0 mi−24h−18h−12h−6hnow
Earth · GOES-19 ABI
Full Disk · Visible · GeoColor
GOES-19 full disk Visible · GeoColor
True-color daytime, blue/IR sandwich at night
01:19 UTC · Riverdale Park, MD · NOAA NESDIS / STAR · up to 10848 px
Continental US · GOES-19 ABI
CONUS Sector · Visible · GeoColor
GOES-19 CONUS Visible · GeoColor
Daytime true-color, blue-light/IR sandwich at night
01:19 UTC · Riverdale Park, MD · NOAA NESDIS / STAR · 5-min cadence · up to 10000 px
Riverdale Park, MD
Satellite · infrared · animated
Riverdale Park, MD
Loading IR frames…
IR · cloud-top temp© RainViewer · Carto
Riverdale Park, MD
Almanac · Saturday, July 4
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
Civil dawn
5:16 AM
Sunrise
1:47 AM
Daylight
14h 49m
Sunset
4:36 PM
Civil dusk
9:09 PM
Planting note
Harvest early potatoes. Begin drying onions on the surface.
Riverdale Park, MD
The moon
Waning Gibbous
77% illuminated
Moonrise
11:24 PM
Moonset
11:17 AM
In sign
♓︎ Pisces
Riverdale Park, MD
Microseason
Jul 1–5

Cicadas claim the afternoon

fish
Jan 151% of the yearDec 31

Read this microseason across nine climate regions →

Riverdale Park at a glance

  • Today vs. normal: 11°F above the seasonal normal for this latitude
  • Last frost: April 10 (climatological average for this latitude)
  • Microseason: Jul 1–5
  • Planting window: Harvest early potatoes. Begin drying onions on the surface.

16-Day Forecast — Riverdale Park

  1. Sat102°82°34%
  2. Sun98°75°51%
  3. Mon86°75°82%
  4. Tue80°72°82%
  5. Wed79°69°37%
  6. Thu96°69°13%
  7. Fri98°75°42%
  8. Sat86°70°38%
  9. Sun80°70°22%
  10. Mon86°65°20%
  11. Tue92°66°17%
  12. Wed91°68°33%
  13. Thu92°68°37%
  14. Fri91°71°42%
  15. Sat91°72°44%
  16. Sun91°69°46%

Forecast data from Open-Meteo (CC BY 4.0).

Right now in the garden

Peak growing season

As of July 5, the growing season is at its peak — frost is months away. Continue succession-planting beans and summer squash. Start fall brassicas (broccoli, cabbage, kale) from seed indoors for transplanting in late summer.

SPC Convective Outlook

Storm Prediction Center — Riverdale Park

SPC has placed Riverdale Park in the Enhanced Risk category for severe thunderstorms today.

  • TODAYENHEnhanced Risk
  • TOMORROWSLGTSlight Risk
  • DAY 3TSTMGeneral Thunderstorms

Numerous severe storms likely. Tornadoes, large hail, and damaging wind gusts possible across the area. Track NWS warnings if storms develop.

Source: NOAA / NWS Storm Prediction Center categorical convective outlook. Outlooks are re-issued multiple times per day; this page reflects the most recent SPC polygons covering the city’s coordinates.

January 1–5: The year turns in silence.January 6–10: Ice thickens on still water.January 11–15: Shortest shadows lengthen.January 16–20: Pheasants begin to call.January 21–25: Springs begin to thaw.January 26–31: Chickadees announce dawn.February 1–5: East wind softens the frost.February 6–10: Sap begins to rise.February 11–15: First snowdrops appear.February 16–20: Red-winged blackbirds return.February 21–25: Rain begins to replace snow.February 26–28: Skunk cabbage pushes through ice.March 1–5: Ice withdraws from the reservoir.March 6–10: Crocuses open to weak sun.March 11–15: Peepers call from the marsh.March 16–20: Woodcocks spiral at dusk.March 21–25: Equinox — light overtakes dark.March 26–31: Forsythia opens along the fences.April 1–5: Cherry blossoms drift like snow.April 6–10: Warblers appear in the understory.April 11–15: Magnolias bloom and fall in a day.April 16–20: Dogwoods float above the forest.April 21–25: Lilacs perfume the evening.April 26–30: Last frost releases the garden.May 1–5: Warblers flood the Ramble.May 6–10: Tulip poplars light their candles.May 11–15: Shad run up the rivers.May 16–20: Roses open along the stoops.May 21–25: Firefly scouts appear at dusk.May 26–31: Strawberries ripen in the sun.June 1–5: Fireflies rise from the lawn.June 6–10: Elderflowers open in hedgerows.June 11–15: Solstice approaches — longest light.June 16–20: Honeysuckle sweetens the night.June 21–25: Solstice — the sun stands still.June 26–30: Lightning bugs drift through oaks.July 1–5: Cicadas claim the afternoon.July 6–10: Queen Anne's lace lines the roads.July 11–15: Thunder builds each afternoon.July 16–20: Corn reaches for the tassels.July 21–25: Dog days settle in the haze.July 26–31: Katydids begin their chorus.August 1–5: Night falls a minute earlier.August 6–10: Sunflowers face the morning.August 11–15: Goldenrod begins to bloom.August 16–20: Crickets pulse through warm nights.August 21–25: First cool morning surprises.August 26–31: Monarchs stage for flight.September 1–5: School buses reappear.September 6–10: Asters purple the roadsides.September 11–15: Hawk migration over the Hudson.September 16–20: Equinox — dark overtakes light.September 21–25: Apples hang heavy on the branch.September 26–30: Geese begin to chevron south.October 1–5: Witch hazel blooms as others fade.October 6–10: Maples begin to blaze.October 11–15: Frost paints the garden black.October 16–20: Oaks turn bronze and russet.October 21–25: Leaves rattle down the gutters.October 26–31: Clocks fall back — dusk at five.November 1–5: Ginkgos drop overnight.November 6–10: Last leaves cling stubbornly.November 11–15: Juncos arrive from the north.November 16–20: Bare branches reveal the sky.November 21–25: First flurries dust the rooftops.November 26–30: Woodsmoke curls through the block.December 1–5: Darkness settles before dinner.December 6–10: Holly and winterberry persist.December 11–15: Shortest day approaches.December 16–20: Ice begins to form at the edges.December 21–25: Solstice — the sun begins return.December 26–31: The year turns in silence.🌱February 14 — First skunk-cabbage spathes thaw their way up☀️March 20 — Spring equinox — day and night balance🌸April 5 — Cherry blossoms peak in the parks🐦May 10 — Warbler migration peaks along the coast✨May 25 — First fireflies scout the meadows at dusk🌞June 21 — Summer solstice — longest day🦗July 25 — Peak cicada chorus in the afternoons🌊August 18 — Warmest sea-surface temperatures of the year🍂September 22 — Autumn equinox — the slow turn❄️October 25 — First widespread frost in the suburbs🍁November 10 — Peak leaf color across the Hudson Valley🌙December 21 — Winter solstice — longest night

Microseason · July 1–5

Cicadas claim the afternoon

Annual cicada buzz begins, peaking in the heat of the day.

Day 186 of 365 · Wedge 37 of 72

The solar year drawn as a wheel of 72 five-day windows. Each wedge is one microseason; the four colored arcs mark winter, spring, summer, and autumn; the small icons sit at notable phenological events. The crimson pointer creeps clockwise as the year turns.

Planting calendar

MonthPlantHarvest
January——
February——
March——
Aprillettuce, peas, spinach, radishes—
Maylettuce, peas, spinach, radishes, tomatoes, peppers, beans, squashlettuce, peas, radishes
Junetomatoes, peppers, beans, squashlettuce, peas, radishes
Julytomatoes, peppers, beans, squashtomatoes, beans, summer squash
August—tomatoes, beans, summer squash
Septemberfall brassicas, garlic (overwinter), carrotstomatoes, beans, summer squash
Octoberfall brassicas, garlic (overwinter), carrotswinter squash, tomatoes (last)
November——
December——

A year in weather

Riverdale Park peaks at about 78°F in July and bottoms near 32°F in January; August brings the heaviest rain (4.2 inches) and October the least (2.6 inches).

MonthMean tempPrecipRainy days
January32°3.3″13
February35°2.8″12
March44°3.4″15
April55°3.7″17
May63°3.5″18
June72°3.9″17
July78°3.2″17
August77°4.2″18
September70°3.4″14
October59°2.6″11
November46°3.6″12
December37°3.9″14

Regional context

Per NOAA NCEI 1991-2020 normals, Riverdale Park runs from a 32°F January mean to 78°F in July, a 46°F seasonal spread, with near 41.5 inches of precipitation across about 175 wet days.

Rainfall in Riverdale Park stays even across the calendar: August tops out at 4.2 inches over 17.8 rainy days, and October still logs 2.6 inches across 11.1 — a narrow range for Riverdale Park. It is a balanced pattern Riverdale Park shares with places like East Riverdale, MD, Edmonston, MD and University Park, MD.

Once Riverdale Park passes mid-April, overnight freezes fade and peas, lettuce, spinach, and radishes can be sown. Tomatoes and peppers do best set out two weeks later in Riverdale Park, once nights clear the mid-40s°F. By mid-November, frost is back in Riverdale Park — protect or harvest anything tender. A creek-bottom lot in Riverdale Park can lag Riverdale Park's last frost 7-10 days behind a south slope.

Similar climates: East Riverdale, MD, Edmonston, MD, University Park, MD, Bladensburg, MD, Hyattsville, MD.

Frequently asked

When does it freeze in Riverdale Park?
Riverdale Park's last spring frost lands near mid-April, and in Riverdale Park the first fall frost follows around mid-November.
What is the rainy season in Riverdale Park?
Rainfall in Riverdale Park peaks in August near 4.2 inches, out of about 42 inches annually.
What is the warmest month in Riverdale Park?
On average July tops the year in Riverdale Park at about 78°F.
What is the coldest month in Riverdale Park?
The coldest stretch in Riverdale Park falls in January, around 32°F on average.
When can I start a vegetable garden in Riverdale Park?
In Riverdale Park, sow peas and hardy greens around mid-April; Riverdale Park's tomatoes and peppers wait two weeks more.
How many rainy days does Riverdale Park get?
Riverdale Park records around 175 days of measurable precipitation annually.
What hardiness zone is Riverdale Park?
Since January in Riverdale Park averages 32°F, Riverdale Park's USDA zone follows that floor — confirm it by ZIP.
What is the 10-day forecast for Riverdale Park?
Riverdale Park's extended outlook — daily high and low temperatures and precipitation chances for each upcoming day — is in the daily forecast above.
Will it rain this week in Riverdale Park?
See this week's day-by-day rain chances for Riverdale Park in the daily forecast above, and the next 24 hours in the hourly chart.
What is the weather like right now in Riverdale Park?
Current conditions for Riverdale Park and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
How often is the Riverdale Park forecast updated?
The Riverdale Park forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
When are sunrise and sunset in Riverdale Park?
Today's sunrise and sunset times for Riverdale Park are in the Almanac section above, along with civil dawn, civil dusk, and day length. Day length is longest near the summer solstice and shortest near the winter solstice.
How accurate is the weather forecast for Riverdale Park?
The next few days in Riverdale Park's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.

Climate

Set in a warm-summer humid continental zone, Riverdale Park, Maryland swings from 32°F in the heart of winter to 78°F at midsummer — a 46°F arc.

In a typical year Riverdale Park records about 42 inches of precipitation on around 175 days.

Riverdale Park sits at 39.0°N; that 46°F seasonal swing frames planting windows and frost dates across Riverdale Park.

All cities in Maryland →

Silver Spring, MD weather →

ZIP codes in Riverdale Park

  • 20737
  • 20740
  • 20738

Climate normals from the Open-Meteo Climate API. Köppen approximation from NOAA NCEI U.S. Climate Regions. See methodology for data sources, editorial rules, and corrections. Maintainer: Brian Tighe.