About Illinois
From Chicago's iconic skyline to Route 66 history, Illinois blends urban excitement with prairie landscapes and Abraham Lincoln heritage.
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Daylight, UV and air quality in Illinois
Live conditions, updated continuously — sun times calculated for this exact location.
- Sunrise
- 05:44
- Sunset
- 18:00
- Golden hour
- 17:24
- Blue hour
- 18:27
Sources: Open-Meteo and our own solar calculations
Climate in Illinois month by month
Long-term averages 1991–2020 — what the weather is normally like, not a forecast.
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Day | 1° | 4° | 10° | 17° | 22° | 27° | 29° | 28° | 25° | 18° | 10° | 4° |
| Night | -7° | -5° | 0° | 6° | 12° | 17° | 20° | 19° | 15° | 9° | 2° | -4° |
| Precipitation (mm) | 53 | 53 | 75 | 106 | 121 | 105 | 96 | 79 | 76 | 78 | 71 | 57 |
| Rain days (days) | 8 | 7 | 10 | 12 | 13 | 12 | 10 | 10 | 8 | 9 | 8 | 8 |
| Sunshine (h/day) | 5.7 | 7 | 8.3 | 8.9 | 10.4 | 11.7 | 12.2 | 11.5 | 10 | 7.9 | 6.4 | 5.5 |
| Colour shows how well the month suits a trip |
Source: Open-Meteo ERA5 reanalysis, 1991–2020
Chance of rain in Illinois month by month
How often it normally rains — share of days with at least 1 mm, averaged over 1991–2020.
Driest period
August – February
Driest month
February · 25%
Wettest month
May · 42%
Chance of rain
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain probability | 27% | 25% | 32% | 40% | 42% | 41% | 33% | 31% | 27% | 30% | 28% | 26% |
Rain days per month
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain days (days) | 8 | 7 | 10 | 12 | 13 | 12 | 10 | 10 | 8 | 9 | 8 | 8 |
Source: Open-Meteo ERA5 reanalysis, 1991–2020
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Where to stay in Illinois
An interactive map of hotels and apartments in Illinois, from our partner Stay22.
Weather in Illinois
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Things to do in Illinois
Tours and activities in Illinois, from our partner GetYourGuide.
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Travel businesses that pay to be visible here.
Paid partner placements. GlobeFellas is compensated by these businesses. It never affects our rankings, ratings or climate data.