Illinois weather
Today's sky, the hour-by-hour rain chance and the 16-day forecast for Illinois, United States. Like most weather services, we show Illinois at one spot: Chicago, its largest city. At 4:30 PM local time it was cloudy and 14°C (57°F). Little to no rain in the next 24 hours. Best months for weather: Jun–Sep.
Current conditions
- Clouds
- 100%
- Chance of rain
- 4%
- Rain
- 0.0 mm/h
Hourly Forecast
Little to no rain in the next 24 hours
Daily Forecast
Best Time to Visit
Peak season Jun–SepOff season Nov–Apr
About Chicago weather
Is it raining in Chicago right now?
No. It’s cloudy and 14° right now. Little to no rain in the next 24 hours.
What’s the weather like in Chicago this week?
Over the next 7 days, expect highs of 13–20° and lows of 11–16°. Rain is likely on 3 of 7 days (Tuesday, Wednesday, Friday). The driest day looks like Sunday.
Has it been raining in Chicago lately?
Barely. The past 7 days were mostly dry, with 0.0 mm of rain in total.
What should I pack for Chicago?
For the coming week, bring an umbrella or rain jacket and a warm layer for the evenings.
Illinois weather by month
When is the best time to visit Illinois?
Based on weather alone, the best time to visit Illinois is Jun–Sep, according to NASA's 2001–2025 climate averages. Nov–Apr tends to be the least pleasant. Average highs run from 0°C (32°F) in January to 25°C (77°F) in July.
What is the rainiest month in Illinois?
May is the wettest month, with about 117 mm (4.6 in) of rain on average. January is the driest, with about 48 mm (1.9 in).
What is the hottest month in Illinois?
July is the warmest, with average highs of 25°C (77°F) and lows of 20°C (68°F). January is the coolest, with highs of 0°C (32°F) and lows of -5°C (23°F).
Does Illinois have a rainy season?
Not a strong one. No month averages more than 150 mm of rain; the wettest is May at about 117 mm (4.6 in).
Illinois weather month by month
Sources: 2001–2025 monthly averages from NASA POWER (MERRA-2 reanalysis for Chicago), forecast and current conditions from Open-Meteo. Page updated . How we rate months
Compare places in Illinois
Weather can differ a lot within Illinois: coasts, hills and mountains each have their own climate.
| Place | Best months | Rainy months | Highs | Rain a year |
|---|---|---|---|---|
| Chicago | Jun–Sep | None | 0–25°C | 982 mm |
| Aurora | May–Sep | None | -1–29°C | 984 mm |
| Rockford | May–Sep | None | -3–28°C | 966 mm |
| Joliet | May–Oct | None | 0–29°C | 984 mm |
| Naperville | May–Sep | None | -1–29°C | 984 mm |
| Peoria | May–Oct | None | 1–30°C | 984 mm |
| Springfield | Apr–Oct | None | 1–30°C | 1,001 mm |
| North Peoria | May–Oct | None | 1–30°C | 984 mm |
| Elgin | May–Sep | None | -1–29°C | 984 mm |
| Waukegan | May–Sep | None | -2–28°C | 971 mm |
| West Town | Jun–Sep | None | 0–25°C | 982 mm |
| Champaign | Apr–Oct | None | 1–29°C | 1,029 mm |
Cities and towns in Illinois
- Chicago
- Aurora
- Rockford
- Joliet
- Naperville
- Peoria
- Springfield
- North Peoria
- Elgin
- Waukegan
- West Town
- Champaign
- Near North Side
- Cicero
- Belmont Cragin
- Bloomington
- Arlington Heights
- Evanston
- Schaumburg
- Bolingbrook
- South Lawndale
- Logan Square
- Decatur
- West Ridge
- Palatine
- Lincoln Park
- Portage Park
- Skokie
- Des Plaines
- Orland Park
- Tinley Park
- Oak Lawn
- Irving Park
- Berwyn
- Chicago Lawn
- Uptown
- Edgewater
- Mount Prospect
- Rogers Park
- Normal
- Wheaton
- Oak Park
- Hoffman Estates
- Albany Park
- South Shore
- Downers Grove
- Glenview
- Elmhurst
- Auburn Gresham
- Brighton Park
- Lombard
- DeKalb
- Ashburn
- Moline
- Plainfield
- Urbana
- Belleville
- Bartlett
- Buffalo Grove
- Gage Park
- New City
- Quincy
- Lincoln Square
- Streamwood
- Crystal Lake
- Carol Stream
- Avondale
- Romeoville
- Rock Island
- Carpentersville
- Hanover Park
- Wheeling
- Park Ridge
- Addison
- Calumet City
- North Lawndale
- North Center
- Lower West Side
- Glendale Heights
- Oswego
- Bridgeport
- Northbrook
- Chicago Loop
- Woodridge
- Elk Grove Village
- Pekin
- St. Charles
- West Lawn
- Greater Grand Crossing
- West Englewood
- Danville
- Mundelein
- Chatham
- Galesburg
- Gurnee
- Algonquin
- Chicago Heights
- Niles
- Highland Park
- North Chicago
- Upper Alton
- Burbank
- Granite City
- Lake in the Hills
- O'Fallon
- Lansing
- Glen Ellyn
- South Chicago
- Oak Forest
- Round Lake Beach
- West Chicago
- Wilmette
- East Saint Louis
- Alton
- Hyde Park
- Kankakee
- McHenry
- Batavia
- Carbondale
- Vernon Hills
- Englewood
- Huntley
- New Lenox
- Melrose Park
- Harvey
- Woodstock
- Lockport
- Belvidere
- Edwardsville
- Westmont
- Elmwood Park
- Collinsville
- Freeport
- Homer Glen
- Rolling Meadows
- Woodlawn
- Zion
- Maywood
- Blue Island
- Loves Park
- Morton Grove
- Dolton
- East Peoria
- Roselle
- Lisle
- Machesney Park
- Morgan Park
- Wasco
- Near South Side
- Grand Boulevard
- South Elgin
- Darien
- Bloomingdale
- South Holland
- Villa Park
- Park Forest
- Geneva
- East Moline
- Charleston
- Crest Hill
- Grayslake
- East Garfield Park
- Libertyville
- Douglas
- Lake Zurich
- Mokena
- Evergreen Park
- Montgomery
- Lake Forest
- Homewood
- Alsip
- Bellwood
- West Elsdon
- Matteson
- Jacksonville
- Deerfield
- Brookfield
- Mount Greenwood
- Frankfort
- Bourbonnais
- Goodings Grove
- Macomb
- Round Lake
- Yorkville
- Bensenville
- Ottawa
- Franklin Park
- Mattoon
- Cary
- Marion
- Godfrey
- West Garfield Park
- Sycamore
- Hinsdale
- Kenwood
- Palos Hills
- North Aurora
- Fairview Heights
- Country Club Hills
- Lemont
- Shorewood
- Westchester
- Washington
- Bridgeview
- Prospect Heights
- Morton
- La Grange
- Bradley
- McKinley Park
- Dixon
- Mount Vernon
- Sterling