Chicago Weather
Chicago weather today, the 14-day forecast, and average temperature, rain and what to wear for every month — compared against Hong Kong. Best months to visit: May, Jun, Jul, Aug, Sep and Oct.
Chicago current weather
Chicago now (local time 05:00)
11°C
Clear
- Feels like
- 9°
- Humidity
- 81%
- Wind
- 11 km/h
Next 7 days · what to wear
9° – 26°C
Mostly dry all week
👕 Short sleeves with a light long-sleeve or jacket for cool mornings and evenings.
Chicago 14-day forecast
Today
10/4
☁️
20°
11°
💧8%
Mon
10/5
🌤️
16°
9°
💧0%
Tue
10/6
🌤️
23°
11°
💧0%
Wed
10/7
☁️
25°
16°
💧3%
Thu
10/8
☁️
20°
15°
💧3%
Fri
10/9
☁️
19°
15°
💧4%
Sat
10/10
☁️
26°
16°
💧2%
Sun
10/11
☁️
22°
16°
💧8%
Mon
10/12
🌦️
20°
16°
💧23%
Tue
10/13
🌦️
19°
13°
💧26%
Wed
10/14
☀️
17°
11°
💧22%
Thu
10/15
☀️
17°
11°
💧20%
Fri
10/16
⛅
19°
10°
💧16%
Sat
10/17
🌤️
17°
11°
💧14%
Best time to visit Chicago
On temperature and rainfall, the most comfortable months in Chicago are May, Jun, Jul, Aug, Sep and Oct. The hottest month is July (average high 25°C) and the coldest is January (average low -5°C).
Chicago climate by month
| Month | Avg high | Avg low | Rain | Humidity | vs Hong Kong |
|---|---|---|---|---|---|
| Jan | 0°C | -5°C | 48 mm | 86% | -19°C |
| Feb | 0°C | -5°C | 54 mm | 84% | -20°C |
| Mar | 5°C | -1°C | 62 mm | 82% | -18°C |
| Apr | 10°C | 4°C | 95 mm | 81% | -17°C |
| MayBest | 15°C | 9°C | 117 mm | 83% | -15°C |
| JunBest | 21°C | 15°C | 102 mm | 81% | -10°C |
| JulBest | 25°C | 20°C | 95 mm | 78% | -7°C |
| AugBest | 25°C | 20°C | 105 mm | 77% | -6°C |
| SepBest | 22°C | 16°C | 86 mm | 76% | -9°C |
| OctBest | 15°C | 10°C | 99 mm | 77% | -14°C |
| Nov | 9°C | 4°C | 61 mm | 80% | -16°C |
| Dec | 3°C | -2°C | 58 mm | 85% | -18°C |
Data: NASA POWER 2001–2020 climatology (MERRA-2, elevation-corrected); Hong Kong comparison uses HKO 1991–2020 normals.
Chicago weather month by month: what to wear
Chicago in OctoberBest monthThis month
October in Chicago is chilly: average highs of 15°C and lows of 10°C, around 99 mm of rain (some rain) and 77% humidity — about 14°C colder than Hong Kong. It's one of the most comfortable months of the year to visit.
👕 Long sleeves with a light jacket or sweater.
Chicago in November
November in Chicago is cold: average highs of 9°C and lows of 4°C, around 61 mm of rain (mostly dry) and 80% humidity — about 16°C colder than Hong Kong.
👕 A warm coat over a sweater, plus a scarf.
Chicago in December
December in Chicago is freezing: average highs of 3°C and lows of -2°C, around 58 mm of rain (mostly dry) and 85% humidity — about 18°C colder than Hong Kong.
👕 A down jacket, thermal base layers, scarf and gloves; snow is possible.
Chicago in January
January in Chicago is freezing: average highs of 0°C and lows of -5°C, around 48 mm of rain (mostly dry) and 86% humidity — about 19°C colder than Hong Kong.
👕 A heavy down jacket, thermals, gloves, a hat and non-slip shoes; snow is possible.
Chicago in February
February in Chicago is freezing: average highs of 0°C and lows of -5°C, around 54 mm of rain (mostly dry) and 84% humidity — about 20°C colder than Hong Kong.
👕 A down jacket, thermal base layers, scarf and gloves; snow is possible.
Chicago in March
March in Chicago is cold: average highs of 5°C and lows of -1°C, around 62 mm of rain (mostly dry) and 82% humidity — about 18°C colder than Hong Kong.
👕 A down jacket, thermal base layers, scarf and gloves.
Chicago in April
April in Chicago is chilly: average highs of 10°C and lows of 4°C, around 95 mm of rain (some rain) and 81% humidity — about 17°C colder than Hong Kong.
👕 A sweater plus a coat or windbreaker.
Chicago in MayBest month
May in Chicago is chilly: average highs of 15°C and lows of 9°C, around 117 mm of rain (some rain) and 83% humidity — about 15°C colder than Hong Kong. It's one of the most comfortable months of the year to visit.
👕 Long sleeves with a light jacket or sweater.
Chicago in JuneBest month
June in Chicago is pleasantly warm: average highs of 21°C and lows of 15°C, around 102 mm of rain (some rain) and 81% humidity — about 10°C colder than Hong Kong. It's one of the most comfortable months of the year to visit.
👕 Short sleeves with a light long-sleeve or jacket for cool mornings and evenings.
Chicago in JulyBest month
July in Chicago is pleasantly warm: average highs of 25°C and lows of 20°C, around 95 mm of rain (some rain) and 78% humidity — about 7°C colder than Hong Kong. It's one of the most comfortable months of the year to visit.
👕 Short sleeves, plus a light layer for air-conditioned interiors.
Chicago in AugustBest month
August in Chicago is pleasantly warm: average highs of 25°C and lows of 20°C, around 105 mm of rain (some rain) and 77% humidity — about 6°C colder than Hong Kong. It's one of the most comfortable months of the year to visit.
👕 Short sleeves, plus a light layer for air-conditioned interiors.
Chicago in SeptemberBest month
September in Chicago is pleasantly warm: average highs of 22°C and lows of 16°C, around 86 mm of rain (some rain) and 76% humidity — about 9°C colder than Hong Kong. It's one of the most comfortable months of the year to visit.
👕 Short sleeves with a light long-sleeve or jacket for cool mornings and evenings.
FAQ
›What is the best time to visit Chicago?
On temperature and rainfall, the most comfortable months in Chicago are May, Jun, Jul, Aug, Sep and Oct. The hottest month is July (average high 25°C) and the coldest is January (average low -5°C).
›What's the weather like in Chicago in October, and what should I wear?
October in Chicago is chilly: average highs of 15°C and lows of 10°C, around 99 mm of rain (some rain) and 77% humidity — about 14°C colder than Hong Kong. It's one of the most comfortable months of the year to visit. What to wear: Long sleeves with a light jacket or sweater.
›What's the weather like in Chicago in November, and what should I wear?
November in Chicago is cold: average highs of 9°C and lows of 4°C, around 61 mm of rain (mostly dry) and 80% humidity — about 16°C colder than Hong Kong. What to wear: A warm coat over a sweater, plus a scarf.
›When is the rainy season in Chicago?
Chicago is wettest in May, with about 117 mm on average, and driest in January, with about 48 mm.
›How cold does Chicago get? Does it snow?
The coldest month is January, averaging 0°C by day and -5°C at night. Nights regularly drop below freezing and snow is possible.
Planning a trip to Chicago?
More United States weather
Popular destinations in October
Forecast data: Open-Meteo.com (CC BY 4.0), refreshed every 3 hours. Hottest month: July; coldest: January.