Rainbow, IL Weather Forecast

Feedback E-mail the Weather

Quick Weather Clicks

Rainbow, IL Weather Forecast

Current Conditions

Settings
Rainbow IL weather  - Overcast - 72°F
Overcast
72°F
Updated 6:20 am
Feels Like 74°F
Humidity 87%
Wind NE 6 mph
Barometer  30.02 in
Dew Point 68°F
Rainbow IL weather  - Overcast - 22°C
Overcast
22°C
Updated 6:20 am
Feels Like 23°C
Humidity 87%
Wind NE 10 km/h
Barometer  101.6 kPa
Dew Point 20°C

Rainbow Weather Forecast

TODAY TONIGHT LABOR DAY MONDAY NIGHT TUESDAY TUESDAY NIGHT WEDNESDAY WEDNESDAY NIGHT THURSDAY THURSDAY NIGHT FRIDAY SATURDAY
Rainbow, IL Weather - Today Mostly Sunny Rainbow, IL Weather - Tonight Partly Cloudy Rainbow, IL Weather - Labor Day Sunny Rainbow, IL Weather - Monday Night Mostly Clear Rainbow, IL Weather - Tuesday Mostly Sunny Rainbow, IL Weather - Tuesday Night Partly Cloudy Rainbow, IL Weather - Wednesday Partly Sunny Rainbow, IL Weather - Wednesday Night Partly Cloudy Rainbow, IL Weather - Thursday Partly Cloudy Rainbow, IL Weather - Thursday Night Mostly Clear Rainbow, IL Weather - Friday Mostly Clear Rainbow, IL Weather - Saturday Mostly Clear
Mostly Sunny Partly Cloudy Sunny Mostly Clear Mostly Sunny Partly Cloudy Partly Sunny Partly Cloudy Partly Cloudy Mostly Clear Mostly Clear Mostly Clear
Hi: 85°FHi: 29°C
Lo: 61°FLo: 16°C Hi: 81°FHi: 27°C
Lo: 61°FLo: 16°C Hi: 90°FHi: 32°C
Lo: 71°FLo: 22°C Hi: 89°FHi: 32°C
Hi: 81°FHi: 27°C
Lo: 65°FLo: 18°C
Hi: 81°FHi: 27°C
Lo: 65°FLo: 18°C
Hi: 85°FHi: 29°C
Lo: 61°FLo: 16°C
Hi: 85°FHi: 29°C
Lo: 61°FLo: 16°C
Hi: 85°FHi: 29°C
Lo: 61°FLo: 16°C
POP = Probability of Precipitation.
Weather Outlook Updated: 437 AM CDT Sun Sep 06 2026 Rainbow, IL Weather - WeatherWorld.com

Trending Headlines

Rainbow Radar Loop

Use the map search tool if you want to place a location marker on the radar map...

Rainbow Quick Facts

National Two Day Weather Forecast


E-mail the Rainbow Weather Forecast

Voice your opinion or tell us about page issues...

Rainbow Forecast Discussion

Meteorlogic Glosserator
Instant definitions for any meteorological term.

Issued: 557 AM CDT Sun Sep 6 2026

Key Messages

  • Welcomed relief is in store for today and Monday, with high temperatures in the 80s for most locations and dropping heat indices into the 80s, near 90.
  • High heat and humidity return Tuesday and Wednesday. Wednesday looks to be the hottest, bringing another risk for triple- digit heat index values. There is a 20-30% chance of heat indices greater than 100 degrees south of I-70 Wednesday afternoon.

Discussion

... Issued at 134 AM CDT Sun Sep 6 2026

A backdoor cold front pushed into the ar...