Local weather forecast

Weather in Flat Rock, IL

Updated 2026-08-11 11:00 local time · ZIP codes 62427

Sunny
Now82°F

Sunny

High / Low98° / 76°
Rain chance5%
Wind14 mph
Weather alerts

Active alerts

1
Heat Advisory issued August 11 at 1:38AM EDT until August 11 at 9:00PM EDT by NWS Indianapolis IN

* WHAT...Heat index values up to 105 expected. * WHERE...Lawrence, Daviess, Greene, Knox, Martin, and Sullivan Counties. * WHEN...From noon today to 9 PM EDT this evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses.

Safety instructions

Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors.

Hourly

Next hours

NowSunny82°3% rain
12 PMSunny96°3% rain
1 PMSunny97°2% rain
2 PMSunny97°2% rain
3 PMSunny98°2% rain
4 PMSunny97°1% rain
5 PMSunny95°2% rain
6 PMSunny93°2% rain
7 PMSunny88°3% rain
8 PMClear84°4% rain
9 PMClear82°7% rain
10 PMClear81°7% rain
Forecast

3-day weather forecast

Today2026-08-11
Sunny
98° 76°Sunny
Rain 5%Gust 15 mph
Tomorrow2026-08-12
Sunny
91° 73°Sunny
Rain 71%Gust 12 mph
Thursday2026-08-13
Patchy rain nearby
84° 70°Patchy rain nearby
Rain 85%Gust 11 mph
Conditions

Weather details

Feels like86°F
Humidity74%
Pressure30.00 inHg
Visibility10 mi
Wind14 mph SW
Wind gusts18 mph
Precipitation0.00 in
UV index6
Daylight

Sunrise, sunset and moon

Sunrise06:00 AM
Sunset07:50 PM
Moonrise04:03 AM
Moon phaseNew Moon
Practical guide

Weather insights for today

Umbrella not essential

Rain chance stays relatively low over the next 12 hours (up to 7%).

Choose light, breathable clothing

It feels like 86°F with winds near 14 mph.

Best window: 8 PM

84°F, 4% rain chance and 9 mph wind.

Driving conditions look generally normal

Visibility is around 10 mi; gusts may reach 23 mph.

Run with a few weather adjustments

Current temperature is 82°F, wind 14 mph, rain chance up to 7%.

High UV protection needed

UV index is 6. Sunscreen, shade and protective clothing are recommended.

Flat Rock weather today

Sunny and 82°F in Flat Rock, IL. Today's high is 98°F with a 5% rain chance. Winds are around 14 mph with gusts near 18 mph. Relative humidity is 74%, pressure is 30.00 inHg, and visibility is about 10 miles.

Tonight and tomorrow in Flat Rock

Sunrise is at 06:00 AM and sunset is at 07:50 PM. Tomorrow's forecast calls for Sunny with a high near 91°F and a low near 73°F. The maximum rain chance is 71%.

Nearby

Weather near Flat Rock

Illinois

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