Chicago Climate and Average Weather
Climate of Chicago: average temperatures, rainfall and seasons month by month.
Climate in Chicago month by month
Average high, average low and total rainfall, based on three years of reanalysis data.
| Month | Avg high | Avg low | Rainfall | Rating |
|---|---|---|---|---|
| January | 29° | 17° | 2,9 in | ★★☆☆☆ |
| February | 40° | 25° | 0,7 in | ★★★☆☆ |
| March | 51° | 34° | 4,1 in | ★★★☆☆ |
| April | 59° | 43° | 4,4 in | ★★★☆☆ |
| May | 67° | 51° | 2,7 in | ★★★★☆ |
| June | 79° | 64° | 5,0 in | ★★★★☆ |
| July | 82° | 68° | 5,0 in | ★★★★☆ |
| August | 79° | 66° | 3,1 in | ★★★★☆ |
| September | 75° | 61° | 3,6 in | ★★★★☆ |
| October | 64° | 50° | 3,1 in | ★★★★☆ |
| November | 50° | 38° | 2,7 in | ★★★☆☆ |
| December | 38° | 27° | 2,7 in | ★★☆☆☆ |
Climate type: Continental. Source: Open-Meteo archive (ERA5).
Recent extremes in Chicago
Highest and lowest readings observed in the last 3 years of reanalysis data - not all-time records.
How Chicago compares with nearby places
Annual averages, and the difference against Chicago.
| Place | Distance | Avg temp | vs here | Annual rain |
|---|---|---|---|---|
| Cook County | 0 mi | 52°F | about the same | 40 in |
| Indiana Dunes National Park | 34 mi | 52°F | about the same | 42 in |
| Starved Rock State Park | 80 mi | 53°F | +33°F warmer | 39 in |
| Milwaukee | 81 mi | 50°F | 34°F cooler | 35 in |
| Wisconsin | 122 mi | 49°F | 35°F cooler | 33 in |
Climate by airport in Chicago
1 airports mapped in this atlas
Climate by district in Chicago
2 districts and neighborhoods mapped in this atlas
Climate by zip / postal code in Chicago
1 zip and postal codes mapped in this atlas
Climate by area code in Chicago
1 area codes mapped in this atlas
Best time to visit Chicago
Go in May, June, August, September and October. These months score highest on comfortable temperatures, low rainfall and useful daylight.
Hardest months: January, February and December - expect the least comfortable mix of heat, cold or rain.
What this means for Chicago
Today is slightly cooler than average for August. The forecast high of 73°F is 6.5°F below the 79°F typical for this month.
Rain is very unlikely today - plans do not need a backup.
No weather-related travel disruption is expected today. Roads and airports should run normally.
Northern Hemisphere, so peak summer falls in June to August.
The gap between the warmest and coldest month averages 84°F.
What to pack, what to skip
- Lightweight, light-coloured clothing and a refillable water bottle
- Sunglasses, a brimmed hat and SPF 30+
- If your dates are flexible, avoid January, February and December - historically the least comfortable months here.
Summary
Chicago is a city in Illinois. Chicago is known for Architecture, deep-dish and lakefront. It has a population of about 2.7 million.
Right now it is 63°F (17°C) in Chicago with clear. It feels like 61°F. Today runs from 59°F to 73°F. Chance of precipitation is 5%. Sightseeing conditions score 9.6/10 - excellent - go now.
The best time to visit Chicago is May, June, August, September and October. The climate is continental. January, February and December tend to be the least comfortable months. July is the warmest month with average highs near 82°F, while January is the coldest with lows near 17°F.
The closest major airport is O'Hare International Airport (ORD), about 16 mi away. Nearby highlights include Indiana Dunes National Park, Starved Rock State Park and Lake Michigan.
In plain terms. Today is slightly cooler than average for August. The forecast high of 73°F is 6.5°F below the 79°F typical for this month. The best window to be outside is roughly 10 AM to 1 PM, when temperature, rain chance and wind line up best. stargazing is the strongest bet in Chicago today at 9.8/10. No weather-related travel disruption is expected today. Roads and airports should run normally.
Compiled from this page's own data: atlas facts plus live Open-Meteo readings.
Quick facts about Chicago
| Type | City |
|---|---|
| State | Illinois |
| Country | United States |
| Continent | North America |
| Coordinates | 41°52′41.2″N 87°37′47.3″W (41.8781, -87.6298) |
| Population | 2.700.000 |
| Known for | Architecture, deep-dish and lakefront |
| Local time | 8:27 AM (UTC-05:00) |
| Best months | May, June, August, September and October |
| Climate | Continental |
Weather map for Chicago
Animated model layers. Pick a layer to load it.
Animated layers by Windy. For pin-level detail and nearby places, see the interactive map below.
Explore Chicago
Every topic we hold for this place, and the same topic for the places around it.
Climate for related places
Frequently asked questions
Where is Chicago?
Chicago is a city in Illinois. Its coordinates are 41.8781, -87.6298. It lies in North America.
What is the weather like in Chicago right now?
It is currently 63°F (17°C) with clear. Humidity is 64% and wind is 5 mph.
When is the best time to visit Chicago?
May, June, August, September and October offer the most comfortable conditions in Chicago, which has a continental climate. January, February and December are usually the hardest months for outdoor plans.
What time zone is Chicago in?
Chicago observes America/Chicago (UTC-05:00). The local time is 8:27 AM.
How many people live in Chicago?
Chicago has a population of approximately 2.7 million.
What is the nearest airport to Chicago?
The closest airports are O'Hare International Airport (ORD), 16 mi away.
What are the top things to do in Chicago?
Popular options include Indiana Dunes National Park, Starved Rock State Park and Lake Michigan.
What places are in Chicago?
Chicago covers 5 places in this atlas, including O'Hare International Airport, The Loop, Wicker Park, ZIP Code 60601 and Area Code 312.
Related articles
Data sources and methodology
| Place data | USPOTUS Atlas dataset (cities-us) - coordinates, hierarchy and facts. |
|---|---|
| Forecast and observations | Open-Meteo (ECMWF and national models). |
| Air quality and pollen | Copernicus CAMS via Open-Meteo. US AQI scale. |
| Climate averages | ERA5 reanalysis via the Open-Meteo archive, aggregated over 3 years. |
| Official alerts | US National Weather Service. |
| Method | Scores, comparisons and advice on this page are computed from the inputs above. Distances are straight-line. Nothing is estimated where data is missing - the block is simply not shown. |
Last updated August 24, 2026 at 8:27 AM local time. Live blocks refresh every 15 minutes; climate averages monthly.
