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Emmaus, Pennsylvania Weather

Cicadas claim the afternoon. Day 14 of summer. Read this microseason across nine climate regions →

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

Emmaus, PA
Saturday, July 4 at 5:13 PM
96
°
Clear
Feels like
99°
Humidity
34%
Wind
6 mph
Sunrise
1:36 AM
Sunset
4:35 PM
Emmaus, PA
Hour by hour · 24h
24-Hour ForecastEmmaus, PA: 24-hour forecast. Temperatures range from 74 to 96 degrees Fahrenheit with a 45% chance of precipitation at 12 AM.
L 74°H 96°
Emmaus, PA
7-day forecast
  1. Today
    Jul 4
    Overcast
    29%
    —
    96°73°—
  2. Sunday
    Jul 5
    Heavy Rain
    57%
    2.2″
    90°73°-6°
  3. Monday
    Jul 6
    Heavy Drizzle
    95%
    0.04″
    78°70°-12°
  4. Tuesday
    Jul 7
    Drizzle
    83%
    0.02″
    73°64°-5°
  5. Wednesday
    Jul 8
    Light Drizzle
    26%
    —
    77°62°+4°
  6. Thursday
    Jul 9
    Overcast
    13%
    —
    86°64°+9°
  7. Friday
    Jul 10
    Light Drizzle
    48%
    0.02″
    82°68°-4°
Emmaus, PA
Next 24 hours · Hot now
HOT 90°65°85°105°6p12a6a12pnow 96°high 96°low 74°PRECIP %
Emmaus, PA
Anemometer · 24h winds · from true
NESW
From · True
WNW
288° · veering 43°
Direction
WNW
288°
Sustained
6
mph
Gust
15
mph
Peak 24h
18
avg 5
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 5 · pk 18 @ 7:00p
01020MPHB1B2B3B4B5-21h-18h-15h-12h-9h-6h-3h-24hNOWpk 208SUSTGUST
−24h−18h−12h−6hnow
Light breeze veering 43° from the wnw.
Emmaus, PA
Barometer · 24h pressure · mb
STORMRAINCHANGEFAIRDRY9901000101010201030
Pressure · mb
996.3
-2.1 mb in 3h · falling rapidly · 29.42 inHg
Now
996.3
mb
3h
-2.1
mb
12h
-1.5
mb
24h
-1.3
mb
Regime · STORM
STORM
RAIN
CHANGE
FAIR
DRY
24h · Pressure · mb
range 996–999
9909951000STORM|RAIN10051010RAIN|CHG1015CHG|FAIR10201025FAIR|DRY1030-21h-18h-15h-12h-9h-6h-3h-24hNOW999.3996.3996.3
−24h−18h−12h−6hnow
Deep low still deepening — rough seas, strong wind, persistent rain.
Emmaus, PA
Air quality
92
AQI
Moderate
↑+34 in 6h▲Peak ~98 @ 10 PM

AQI 92 (Moderate), driven by Ozone. AQI up 34 in the last 6 hours — air quality is degrading. Ozone at AQI 86 — peak already passed at 1 PM under clear skies. Levels should ease through evening.

OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion during the projected peak around 10 PM.

PM 2.5Good
7.8μg/m³
PM 10Good
8μg/m³
NO₂Good
2μg/m³
OzoneDRIVERUnhealthy SG
129μg/m³
UV IndexModerate
2.1

What's driving it

Ozone × UV × Sky

Ozone at AQI 86 — peak already passed at 1 PM under clear skies. Levels should ease through evening.

Present
AQI 86
UV peak
1.8 at earlier today
Sky at peak
clear
Projected peak
AQI 86

PM × Wind × Precip

PM2.5 at 7.8 µg/m³ (AQI 43) with a 0.93 fine-to-coarse ratio and 6 mph wind — combustion smoke trapped in calm air, not road dust.

PM2.5/PM10
0.93
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 TREND50100SATSUNMONTUEWEDTHUFRISAT7-DAY PM2.5 TREND · μg/m³480
Emmaus, PA
Sky cover · visibility · 24h
Cloud cover
0%
CLEAR
100%0%−24h−18h−12h−6hnow
Visibility
102.5mi
UNLIMITED
104 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
21:13 UTC · Emmaus, PA · 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
21:13 UTC · Emmaus, PA · NOAA NESDIS / STAR · 5-min cadence · up to 10000 px
Emmaus, PA
Satellite · infrared · animated
Emmaus, PA
Loading IR frames…
IR · cloud-top temp© RainViewer · Carto
Emmaus, PA
Almanac · Saturday, July 4
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
Civil dawn
5:04 AM
Sunrise
1:36 AM
Daylight
14h 59m
Sunset
4:35 PM
Civil dusk
9:10 PM
Planting note
Harvest early potatoes. Begin drying onions on the surface.
Emmaus, PA
The moon
Waning Gibbous
78% illuminated
Moonrise
10:56 PM
Moonset
10:05 AM
In sign
♓︎ Pisces
Emmaus, PA
Microseason
Jul 1–5

Cicadas claim the afternoon

plant
Jan 151% of the yearDec 31

Read this microseason across nine climate regions →

Emmaus at a glance

  • Today vs. normal: 25°F above the seasonal normal for this latitude
  • Last frost: April 19 (climatological average for this latitude)
  • Microseason: Jul 1–5
  • Planting window: Harvest early potatoes. Begin drying onions on the surface.

ZIP code: 18049

16-Day Forecast — Emmaus

  1. Sat97°73°29%
  2. Sun90°72°57%
  3. Mon78°70°95%
  4. Tue73°64°83%
  5. Wed77°62°26%
  6. Thu86°64°13%
  7. Fri82°68°48%
  8. Sat84°70°27%
  9. Sun80°66°29%
  10. Mon76°65°20%
  11. Tue85°64°17%
  12. Wed85°63°34%
  13. Thu88°65°45%
  14. Fri90°67°39%
  15. Sat88°69°39%
  16. Sun87°75°49%

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

Right now in the garden

Peak growing season

As of July 4, 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 — Emmaus

SPC has placed Emmaus in the Slight Risk category for severe thunderstorms today.

  • TODAYSLGTSlight Risk
  • TOMORROWSLGTSlight Risk
  • DAY 3TSTMGeneral Thunderstorms

Scattered severe storms possible. A few tornadoes, hail, and damaging wind gusts possible.

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 185 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

Emmaus peaks at about 75°F in July and bottoms near 29°F in January; December brings the heaviest rain (4.3 inches) and February the least (2.9 inches).

MonthMean tempPrecipRainy days
January29°3.4″14
February31°2.9″13
March40°3.7″16
April51°4.0″17
May60°4.1″17
June69°4.1″17
July75°3.4″15
August74°4.1″18
September67°3.9″15
October56°3.2″12
November43°3.8″13
December33°4.3″14

Regional context

Per NOAA NCEI 1991-2020 normals, Emmaus runs from a 29°F January mean to 75°F in July, a 47°F seasonal spread, with near 44.9 inches of precipitation across about 180 wet days.

No season owns Emmaus's rain: December reaches 4.3 inches across 13.8 days and February keeps 2.9 inches on 12.8, an even spread through Emmaus's year. It is a balanced pattern Emmaus shares with places like Dorneyville, PA, Macungie, PA and Wescosville, PA.

Around mid-April, Emmaus sheds its freezing nights — kale, peas, spinach, and parsnips go into Emmaus's beds. Emmaus's heat-lovers — tomatoes, peppers, squash — hold off until Emmaus's frost risk clears, 10-14 days on. By mid-November, frost is back in Emmaus — protect or harvest anything tender. A creek-bottom lot in Emmaus can lag Emmaus's last frost 7-10 days behind a south slope.

Similar climates: Dorneyville, PA, Macungie, PA, Wescosville, PA, Cetronia, PA, Allentown, PA.

Frequently asked

When does it freeze in Emmaus?
Frost typically leaves Emmaus by mid-April and returns to Emmaus near mid-November.
What is the rainy season in Emmaus?
Rainfall in Emmaus peaks in December near 4.3 inches, out of about 45 inches annually.
What is the warmest month in Emmaus?
On average July tops the year in Emmaus at about 75°F.
What is the coldest month in Emmaus?
The coldest stretch in Emmaus falls in January, around 29°F on average.
When can I start a vegetable garden in Emmaus?
Around mid-April, start frost-hardy crops in Emmaus; tomatoes and basil belong a fortnight later.
How many rainy days does Emmaus get?
Emmaus records around 180 days of measurable precipitation annually.
What hardiness zone is Emmaus?
With January around 29°F, Emmaus's zone reflects that minimum — the USDA ZIP map confirms Emmaus's band.
What is the 10-day forecast for Emmaus?
Emmaus'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 Emmaus?
See this week's day-by-day rain chances for Emmaus in the daily forecast above, and the next 24 hours in the hourly chart.
What is the weather like right now in Emmaus?
Current conditions for Emmaus and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
How often is the Emmaus forecast updated?
The Emmaus forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
When are sunrise and sunset in Emmaus?
Today's sunrise and sunset times for Emmaus 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 Emmaus?
The next few days in Emmaus'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, Emmaus, Pennsylvania swings from 29°F in the heart of winter to 75°F at midsummer — a 46°F arc.

Yearly precipitation in Emmaus totals around 45 inches, spread over about 180 days of rain or snow.

Emmaus sits at 40.5°N; that 46°F seasonal swing frames planting windows and frost dates across Emmaus.

All cities in Pennsylvania →

Allentown, PA weather →

ZIP codes in Emmaus

  • 18049
  • 18098
  • 18099

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.