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

Granite City, Illinois Weather

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

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

Granite City, IL
Saturday, July 4 at 12:05 PM
91
°
Partly Cloudy
Feels like
100°
Humidity
59%
Wind
6 mph
Sunrise
12:41 AM
Sunset
3:28 PM
Granite City, IL
Hour by hour · 24h
24-Hour ForecastGranite City, IL: 24-hour forecast. Temperatures range from 71 to 96 degrees Fahrenheit with a 27% chance of precipitation at 1 AM.
L 71°H 96°
Granite City, IL
7-day forecast
  1. Today
    Jul 4
    Overcast
    18%
    —
    96°77°—
  2. Sunday
    Jul 5
    Heavy Rain
    29%
    0.87″
    84°71°-12°
  3. Monday
    Jul 6
    Overcast
    24%
    —
    88°70°+4°
  4. Tuesday
    Jul 7
    Overcast
    —
    —
    86°69°-2°
  5. Wednesday
    Jul 8
    Overcast
    10%
    —
    94°69°+8°
  6. Thursday
    Jul 9
    Light Drizzle
    31%
    —
    97°76°+3°
  7. Friday
    Jul 10
    Thunderstorm
    45%
    0.02″
    91°74°-6°
Granite City, IL
Next 24 hours · Hot now
HOT 90°65°85°105°12p6p12a6anow 91°high 96°low 71°PRECIP %
Granite City, IL
Anemometer · 24h winds · from true
NESW
From · True
WSW
247° · veering 27°
Direction
WSW
247°
Sustained
6
mph
Gust
12
mph
Peak 24h
24
avg 6
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 6 · pk 24 @ 9:00p
0102030MPHB1B2B3B4B5B6B7-21h-18h-15h-12h-9h-6h-3h-24hNOWpk 3017SUSTGUST
−24h−18h−12h−6hnow
Light breeze veering 27° from the wsw.
Granite City, IL
Barometer · 24h pressure · mb
STORMRAINCHANGEFAIRDRY9901000101010201030
Pressure · mb
1000.8
+0.2 mb in 3h · steady · 29.55 inHg
Now
1000.8
mb
3h
+0.2
mb
12h
-0.6
mb
24h
-2.3
mb
Regime · RAIN
STORM
RAIN
CHANGE
FAIR
DRY
24h · Pressure · mb
range 1000–1003
9951000STORM|RAIN10051010RAIN|CHG1015CHG|FAIR10201025FAIR|DRY1030-21h-18h-15h-12h-9h-6h-3h-24hNOW1003.1999.61000.8
−24h−18h−12h−6hnow
Damp, unsettled regime — wet weather lingers nearby.
Granite City, IL
Air quality
41
AQI
Good
→0 in 6h▲Peak ~69 @ 11 PM

AQI 41 (Good), driven by Ozone. Ozone at AQI 65 now. With UV 6.2 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 38 around 1 PM.

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

PM 2.5Good
12.0μg/m³
PM 10Good
13μg/m³
NO₂Good
4μg/m³
OzoneDRIVERUnhealthy SG
116μg/m³
UV IndexHigh
6.0

What's driving it

Ozone × UV × Sky

Ozone at AQI 65 now. With UV 6.2 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 38 around 1 PM.

Present
AQI 65
UV peak
6.2 at 1 PM
Sky at peak
partly cloudy
Projected peak
AQI 38

PM × Wind × Precip

PM2.5 at 12.0 µg/m³ (AQI 56) with a 0.92 fine-to-coarse ratio and 6 mph wind — combustion smoke trapped in calm air, not road dust.

PM2.5/PM10
0.92
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/m³320
Granite City, IL
Sky cover · visibility · 24h
Cloud cover
56%
PARTLY CLOUDY
100%0%−24h−18h−12h−6hnow
Visibility
61.4mi
UNLIMITED
82 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
17:05 UTC · Granite City, IL · 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
17:05 UTC · Granite City, IL · NOAA NESDIS / STAR · 5-min cadence · up to 10000 px
Granite City, IL
Satellite · infrared · animated
Granite City, IL
Loading IR frames…
IR · cloud-top temp© RainViewer · Carto
Granite City, IL
Almanac · Saturday, July 4
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
Civil dawn
5:10 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.
Granite City, IL
The moon
Waning Gibbous
80% illuminated
Moonrise
10:53 PM
Moonset
10:08 AM
In sign
♓︎ Pisces
Granite City, IL
Microseason
Jul 1–5

Cicadas claim the scorching afternoon

bird
Jan 151% of the yearDec 31

Read this microseason across nine climate regions →

Granite City at a glance

  • Today vs. normal: 18°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.

ZIP code: 62040

16-Day Forecast — Granite City

  1. Sat96°77°18%
  2. Sun84°71°29%
  3. Mon88°70°24%
  4. Tue86°69°8%
  5. Wed94°69°10%
  6. Thu97°76°31%
  7. Fri91°74°45%
  8. Sat91°75°25%
  9. Sun80°65°6%
  10. Mon79°61°6%
  11. Tue81°63°11%
  12. Wed84°67°12%
  13. Thu84°68°14%
  14. Fri82°69°10%
  15. Sat87°71°13%
  16. Sun93°75°16%

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 — Granite City

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

  • TODAYSLGTSlight Risk
  • TOMORROWTSTMGeneral Thunderstorms
  • 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: 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

Granite City's warmest month is July (~81°F mean) and its coldest is January (~31°F). Rainfall peaks in May (4.4 inches) and bottoms out in January (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

Granite City'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.

No season owns Granite City's rain: May reaches 4.4 inches across 17.2 days and January keeps 2.1 inches on 12.7, an even spread through Granite City's year. That lines Granite City up with places like Madison, IL, Mitchell, IL and Pontoon Beach, IL, fed by overlapping storm tracks.

The cool-season window in Granite City starts at mid-April, when nights stop freezing — think peas, lettuce, spinach, and radishes. Hold Granite City's tender crops — tomatoes, peppers, basil — until 10-14 days past Granite City's last frost. Granite City's window closes around mid-November as overnight lows return below freezing. Within Granite City, cold-air pooling chills low spots by 5-10°F, shifting Granite City's local frost dates.

Similar climates: Madison, IL, Mitchell, IL, Pontoon Beach, IL, Venice, IL, Fairmont City, IL.

Frequently asked

When does it freeze in Granite City?
Granite City's last spring frost lands near mid-April, and in Granite City the first fall frost follows around mid-November.
What is the rainy season in Granite City?
May is the wettest month in Granite City, about 4.4 inches on average; the year totals roughly 39 inches.
What is the warmest month in Granite City?
The warmest stretch in Granite City comes in July, around 81°F on average.
What is the coldest month in Granite City?
On average January is the chilliest month in Granite City, about 31°F.
When can I start a vegetable garden in Granite City?
Granite City's last frost (mid-April) cues hardy greens; in Granite City, hold heat-lovers two weeks past.
How many rainy days does Granite City get?
Granite City records around 161 days of measurable precipitation annually.
What hardiness zone is Granite City?
Granite City's USDA zone comes from its January mean (31°F); enter the ZIP on the USDA lookup for the number.
What is the 10-day forecast for Granite City?
Granite City'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 Granite City?
See this week's day-by-day rain chances for Granite City in the daily forecast above, and the next 24 hours in the hourly chart.
What is the weather like right now in Granite City?
Current conditions for Granite City and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
How often is the Granite City forecast updated?
The Granite City forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
When are sunrise and sunset in Granite City?
Today's sunrise and sunset times for Granite City 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 Granite City?
The next few days in Granite City's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.

Climate

Granite City's humid subtropical climate in Illinois pairs 31°F Januarys with 81°F Julys, 50°F apart across the seasons.

Across the year, Granite City collects about 39 inches of precipitation over roughly 161 days with measurable rain or snow.

The 50°F gap between Granite City's summer and winter, at 38.7°N, shapes Granite City's frost calendar.

All cities in Illinois →

St. Louis, MO weather →

ZIP codes in Granite City

  • 62048
  • 62040

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.