Weather StoryAlmanac, microseasons, and the day's weather story.

St. Louis, Missouri Weather

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

St. Louis weather forecast — hour by hour, 7-day outlook, NOAA radar

St. Louis, MO
Saturday, July 4 at 5:53 AM
76
°
Mostly Clear
Feels like
84°
Humidity
90%
Wind
3 mph
Sunrise
12:41 AM
Sunset
3:28 PM
St. Louis, MO
Hour by hour · 24h
24-Hour ForecastSt. Louis, MO: 24-hour forecast. Temperatures range from 73 to 97 degrees Fahrenheit.
L 73°H 97°
St. Louis, MO
7-day forecast
  1. Today
    Jul 4
    Drizzle
    18%
    0.05″
    97°76°—
  2. Sunday
    Jul 5
    Light Drizzle
    17%
    0.02″
    84°73°-13°
  3. Monday
    Jul 6
    Overcast
    25%
    —
    88°71°+4°
  4. Tuesday
    Jul 7
    Clear
    12%
    —
    91°70°+3°
  5. Wednesday
    Jul 8
    Overcast
    13%
    —
    98°70°+7°
  6. Thursday
    Jul 9
    Light Drizzle
    29%
    —
    90°72°-8°
  7. Friday
    Jul 10
    Drizzle
    30%
    —
    89°72°-1°
St. Louis, MO
Next 24 hours · Mild now
HOT 90°65°85°105°12a6a12p6pnow 76°high 97°low 73°PRECIP %
St. Louis, MO
Anemometer · 24h winds · from true
NESW
From · True
NNE
029° · backing 120°
Direction
NNE
029°
Sustained
3
mph
Gust
3
mph
Peak 24h
19
avg 5
Beaufort · 1 · LIGHT AIR
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 19 @ 8:00p
01020304050MPHB1B2B3B4B5B6B7B8B9-21h-18h-15h-12h-9h-6h-3h-24hNOWpk 486SUSTGUST
−24h−18h−12h−6hnow
A whisper of wind — leaves barely shift on the trees.
St. Louis, MO
Barometer · 24h pressure · mb
STORMRAINCHANGEFAIRDRY9901000101010201030
Pressure · mb
999.3
0.0 mb in 3h · steady · 29.51 inHg
Now
999.3
mb
3h
0.0
mb
12h
+0.2
mb
24h
-1.7
mb
Regime · STORM
STORM
RAIN
CHANGE
FAIR
DRY
24h · Pressure · mb
range 998–1002
9909951000STORM|RAIN10051010RAIN|CHG1015CHG|FAIR10201025FAIR|DRY1030-21h-18h-15h-12h-9h-6h-3h-24hNOW1002.3997.7998.9
−24h−18h−12h−6hnow
Deep low — expect rough seas, strong wind, and persistent rain.
St. Louis, MO
Air quality
48
AQI
Good
→-2 in 6h

AQI 48 (Good), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM2.5 at 7.7 µg/m³ (AQI 43) with a 0.95 fine-to-coarse ratio and 3 mph wind — combustion smoke trapped in calm air, not road dust.

OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.

PM 2.5DRIVERGood
7.7μg/m³
PM 10Good
8μg/m³
NO₂Good
10μg/m³
OzoneGood
56μg/m³
UV IndexLow
0.0

What's driving it

PM × Wind × Precip

PM2.5 at 7.7 µg/m³ (AQI 43) with a 0.95 fine-to-coarse ratio and 3 mph wind — combustion smoke trapped in calm air, not road dust.

PM2.5/PM10
0.95
Wind
calm
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/m³330
St. Louis, MO
Sky cover · visibility · 24h
Cloud cover
33%
MOSTLY CLEAR
100%0%−24h−18h−12h−6hnow
Visibility
29.2mi
UNLIMITED
80 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
10:53 UTC · St. Louis, MO · 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
10:53 UTC · St. Louis, MO · NOAA NESDIS / STAR · 5-min cadence · up to 10000 px
St. Louis, MO
Satellite · infrared · animated
St. Louis, MO
Loading IR frames…
IR · cloud-top temp© RainViewer · Carto
St. Louis, MO
Almanac · Saturday, July 4
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
Civil dawn
5:11 AM
Sunrise
12:41 AM
Daylight
14h 47m
Sunset
3:28 PM
Civil dusk
9:01 PM
Planting note
Harvest early potatoes. Begin drying onions on the surface.
St. Louis, MO
The moon
Waning Gibbous
82% illuminated
Moonrise
10:54 PM
Moonset
10:08 AM
In sign
♓︎ Pisces
St. Louis, MO
Microseason
Jul 1–5

Cicadas claim the scorching afternoon

bird
Jan 151% of the yearDec 31

Read this microseason across nine climate regions →

St. Louis at a glance

  • Today vs. normal: 3°F above the seasonal normal for this latitude
  • Last frost: April 8 (climatological average for this latitude)
  • Microseason: Jul 1–5
  • Planting window: Harvest early potatoes. Begin drying onions on the surface.

15-Day Forecast — St. Louis

  1. Sat96°76°18%
  2. Sun84°73°17%
  3. Mon88°71°25%
  4. Tue91°70°12%
  5. Wed98°70°13%
  6. Thu90°72°29%
  7. Fri89°72°30%
  8. Sat95°76°19%
  9. Sun99°75°11%
  10. Mon106°84°3%
  11. Tue89°75°4%
  12. Wed90°69°10%
  13. Thu92°68°10%
  14. Fri98°76°6%
  15. Sat89°75°15%

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

Live wind & temperature near St. Louis

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 — St. Louis

SPC has placed St. Louis in the Marginal Risk category for severe thunderstorms today.

  • TODAYMRGLMarginal Risk
  • TOMORROWTSTMGeneral Thunderstorms
  • DAY 3TSTMGeneral Thunderstorms

Isolated severe storms possible. Limited threat for hail or damaging wind.

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: Frost quiets the live oaks.January 6–10: Still water thickens with ice.January 11–15: Springs begin to move beneath ice.January 16–20: Cardinal dawn calls grow bolder.January 21–25: Late January thaw pulses.January 26–31: Last freeze locks the land.February 1–5: February's lengthening light.February 6–10: Warming winds thaw the margin.February 11–15: Magnolia blooms break the gray.February 16–20: Mockingbirds resume the dawn chorus.February 21–25: Rain replaces the last snow.February 26–28: Mist clings to greening valleys.March 1–5: The green pulse awakens.March 6–10: Hibernators emerge to call.March 11–15: Dogwood and redbud ignite.March 16–20: Swallowtails emerge from winter silk.March 21–25: Light crowns the dogwood canopy.March 26–31: Redbud cascades over the thaw.April 1–5: Thunder announces the wet season.April 6–10: Barn swallows carve the warming sky.April 11–15: Magnolia blooms and falls in a breath.April 16–20: First rainbows arch over thunderheads.April 21–25: Reeds push through marsh water.April 26–30: Frost retreats; seedlings rise free.May 1–5: Warblers flood the canopy in waves.May 6–10: Tulip poplar lights the forest crown.May 11–15: Shad pulse upstream through rapids.May 16–20: Roses open on the Piedmont edge.May 21–25: Fireflies scout the humid dusk.May 26–31: Frog choruses rise from every wetland.June 1–5: Fireflies pulse through the magnolias.June 6–10: Kudzu climbs deeper into green.June 11–15: Sun climbs to its northern throne.June 16–20: Heat settles and the rain begins.June 21–25: The longest day turns toward shadow.June 26–30: Fireflies drift through Spanish moss.July 1–5: Cicadas claim the scorching afternoon.July 6–10: Thunderheads boil and break at dusk.July 11–15: Thunder builds each drowsy afternoon.July 16–20: Cicadas claim the long noon.July 21–25: Dog days drape the earth in haze.July 26–31: Katydids begin their rasping chorus.August 1–5: Dusk arrives one minute earlier each night.August 6–10: Meteorological summer's turning page.August 11–15: Cool winds gather at the margins.August 16–20: Dog-day cicadas rise.August 21–25: Heat breaks in creek beds.August 26–31: Monarchs gather strength.September 1–5: Harvests begin in earnest.September 6–10: Dew beads on resurrection fern.September 11–15: Raptors trail the thermals.September 16–20: Day and dark find balance.September 21–25: Thunder quiets the land.September 26–30: Insects retreat below.October 1–5: Swamp waters recede.October 6–10: Maples ignite the ridge.October 11–15: Asters crown the meadows.October 16–20: Crickets sing at dusk.October 21–25: Frost paints the garden.October 26–31: Light rains whisper down.November 1–5: Sweetgum Turns Crimson.November 6–10: Camellia Blooms Break Through.November 11–15: Earth Stiffens Underfoot.November 16–20: Bare Limbs Hold the Light.November 21–25: First Frost Grips the High Ground.November 26–30: North Wind Strips the Last Leaves.December 1–5: Darkness Falls Before Dinner.December 6–10: Winter Locks the Land.December 11–15: Wildlife Retreats to Shelter.December 16–20: Ice Edges Deepen Inward.December 21–25: The Sun Begins its 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 scorching afternoon

Dog-day cicadas emerge in waves, their rasp dominating every sunny hour; heat peaks above 90 degrees daily.

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

July is St. Louis's warmest stretch (~81°F) and January its coldest (~31°F); precipitation crests in May at 4.4 inches and ebbs in January to 2.1 inches.

MonthMean tempPrecipRainy days
January31°2.1″13
February35°2.3″12
March45°4.0″16
April57°4.3″15
May66°4.4″17
June75°4.2″15
July81°2.7″13
August80°2.9″13
September72°2.6″11
October60°2.8″11
November45°3.6″13
December34°3.0″12

Regional context

St. Louis's climate, from NOAA NCEI 1991-2020 station normals, pairs 31°F Januarys with 81°F Julys — a 50°F swing. About 39.1 inches of precipitation falls over roughly 161 days a year.

St. Louis's precipitation spreads evenly: May peaks at 4.4 inches on 17.2 wet days, while January holds 2.1 inches over 12.7 — no month dominates St. Louis's rain calendar. That even rhythm groups St. Louis with places like Wellston, MO, Hillsdale, MO and Uplands Park, MO.

By mid-April the frosts ease in St. Louis, opening the season for peas, lettuce, spinach, and radishes. In St. Louis, warm-season transplants — tomatoes, peppers, basil — wait two weeks past St. Louis's frost date. It shuts near mid-November, when freezes return to St. Louis and tender plants need cover. In St. Louis, low spots run 4-7°F colder than nearby slopes, nudging St. Louis's frost dates a week.

Similar climates: Wellston, MO, Hillsdale, MO, Uplands Park, MO, Pine Lawn, MO, Velda Village Hills, MO.

Naturalist notes

Late May brings the peak blooming period for native elderberry shrubs throughout the St. Louis area.

Ruby-throated hummingbirds typically arrive in St. Louis during the first week of May as spring migration reaches its peak.

Frequently asked

When does it freeze in St. Louis?
St. Louis's last spring frost lands near mid-April, and in St. Louis the first fall frost follows around mid-November.
What is the rainy season in St. Louis?
St. Louis sees its heaviest rain in May (around 4.4 inches), part of roughly 39 inches a year.
What is the warmest month in St. Louis?
St. Louis peaks in July, when the mean runs near 81°F.
What is the coldest month in St. Louis?
January is St. Louis's coldest month, averaging about 31°F.
When can I start a vegetable garden in St. Louis?
Hardy spring crops go in near mid-April in St. Louis; tender peppers and squash wait 10–14 days.
How many rainy days does St. Louis get?
St. Louis averages about 161 days with measurable rain or snow each year.
What hardiness zone is St. Louis?
Because St. Louis bottoms near 31°F in January, that winter low sets St. Louis's USDA zone — verify by ZIP.
What is the 10-day forecast for St. Louis?
St. Louis'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 St. Louis?
See this week's day-by-day rain chances for St. Louis in the daily forecast above, and the next 24 hours in the hourly chart.
What is the weather like right now in St. Louis?
Current conditions for St. Louis and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
How often is the St. Louis forecast updated?
The St. Louis forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
When are sunrise and sunset in St. Louis?
Today's sunrise and sunset times for St. Louis 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 St. Louis?
The next few days in St. Louis's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.

Climate

In St. Louis, Missouri, the humid subtropical climate runs from about 31°F in January to 81°F in July, a 50°F seasonal range.

In a typical year St. Louis records about 39 inches of precipitation on around 161 days.

From 38.6°N, St. Louis sees a 50°F seasonal swing that governs St. Louis's planting and frost windows.

All cities in Missouri →

ZIP codes in St. Louis

  • 63110
  • 63111
  • 63112
  • 63113
  • 63115
  • 63116
  • 63118
  • 63120
  • 63107
  • 63106
  • 63104
  • 63103
  • 63102
  • 63101
  • 63109
  • 63108
  • 63155
  • 63139
  • 63137
  • 63143
  • 63147
  • 63150
  • 63156
  • 63157
  • 63158
  • 63160
  • 63163
  • 63164
  • 63166
  • 63169
  • 63177
  • 63178
  • 63179
  • 63180
  • 63188
  • 63197

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.