Flat Rock, Illinois Weather
Sun climbs to its northern throne. Day 88 of spring. Read this microseason across nine climate regions →
Flat Rock weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 15Mostly Clear——77°60°—
- TuesdayJun 16Light Rain42%0.07″82°56°+5°
- WednesdayJun 17T-storm w/ Hail70%—86°57°+4°
- ThursdayJun 18Thunderstorm70%0.51″75°65°-11°
- FridayJun 19Light Drizzle16%—77°58°+2°
- SaturdayJun 20Overcast——76°55°-1°
- SundayJun 21Light Showers39%0.01″82°61°+6°
AQI 26 (Good), driven by Ozone. Ozone at AQI 43 now. With UV 8.8 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 50 around 1 PM.
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 43 now. With UV 8.8 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 50 around 1 PM.
- Present
- AQI 43
- UV peak
- 8.8 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 50
PM × Wind × Precip
PM2.5 at 5.4 µg/m³, PM10 at 6.0 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.90
- Wind
- breezy
- Recent rain
- 0h in last 6h
- Pattern
- background
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).
A summer fog for fair, a winter fog for rain.
- Moonrise
- 5:28 AM
- Moonset
- 8:32 PM
- In sign
- ♋︎ Cancer
Sun climbs to its northern throne
Flat Rock at a glance
- Today vs. normal: 76°F — typical for the season
- Last frost: April 9 (climatological average for this latitude)
- Microseason: Jun 11–15
- Planting window: Stake and prune tomato suckers. Watch for squash vine borers.
16-Day Forecast — Flat Rock
- Mon77°60°2%
- Tue82°56°42%
- Wed86°57°70%
- Thu75°65°70%
- Fri77°58°16%
- Sat76°55°8%
- Sun82°61°39%
- Mon84°67°43%
- Tue77°68°24%
- Wed77°64°12%
- Thu79°65°10%
- Fri80°61°18%
- Sat72°61°39%
- Sun89°72°36%
- Mon78°64°29%
- Tue77°62°33%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Peak growing season
As of June 15, 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 — Flat Rock
SPC has placed Flat Rock in the Slight Risk category for severe thunderstorms day after tomorrow.
- TODAYNONENo severe risk
- TOMORROWMRGLMarginal Risk
- DAY 3SLGTSlight Risk
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 Flat Rock
- 62427