Collinsville, Illinois Weather
Cicadas claim the scorching afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Collinsville weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Heavy Rain22%0.91″90°76°—
- SundayJul 5Heavy Rain33%0.31″84°73°-6°
- MondayJul 6Clear23%—82°68°-2°
- TuesdayJul 7Clear——82°62°0°
- WednesdayJul 8Overcast11%—93°65°+11°
- ThursdayJul 9Overcast31%—92°73°-1°
- FridayJul 10Overcast44%—94°74°+2°
AQI 41 (Good), driven by Ozone. Ozone at AQI 85. Overcast through the UV peak window (cloud cover ~98%) — afternoon ozone should stay flat.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
Ozone × UV × Sky
Ozone at AQI 85. Overcast through the UV peak window (cloud cover ~98%) — afternoon ozone should stay flat.
- Present
- AQI 85
- UV peak
- 5.8 at 1 PM
- Sky at peak
- overcast
- Projected peak
- AQI 33
PM × Wind × Precip
PM scrubbed by 3 hours of recent rain — PM2.5 down to 11.8 µg/m³, PM10 to 12.9 µg/m³.
- PM2.5/PM10
- 0.91
- Wind
- breezy
- Recent rain
- 3h in last 6h
- Pattern
- washed out
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).
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
- Moonrise
- 10:53 PM
- Moonset
- 10:07 AM
- In sign
- ♓︎ Pisces
Cicadas claim the scorching afternoon
Collinsville at a glance
- Today vs. normal: 4°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: 62234
16-Day Forecast — Collinsville
- Sat90°76°22%
- Sun84°73°33%
- Mon82°68°23%
- Tue82°62°9%
- Wed93°65°11%
- Thu92°73°31%
- Fri94°74°44%
- Sat79°65°26%
- Sun78°60°6%
- Mon80°59°6%
- Tue78°59°11%
- Wed83°59°10%
- Thu89°65°23%
- Fri90°71°17%
- Sat81°68°20%
- Sun77°68°30%
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 — Collinsville
SPC has placed Collinsville 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.
ZIP codes in Collinsville
- 62234