11-day outlook — past day 10 this is an outlook from the end of the GFS run: expect differences of several degrees.
Morning
Light rain
13°
Feels like 13°
Wind↑ ENE 5 km/h
Gusts11 km/h
Humidity 98 %
💧 4.7 mm
Evening
Drizzle
11°
Feels like 11°
Wind↑ N 14 km/h
Gusts32 km/h
Humidity 87 %
💧 0.4 mm
12-day outlook — past day 10 this is an outlook from the end of the GFS run: expect differences of several degrees.
Morning
Overcast
10°
Feels like 10°
Wind↑ NNE 7 km/h
Humidity 78 %
Evening
Clear sky
12°
Feels like 12°
Wind↑ S 5 km/h
Gusts12 km/h
Humidity 69 %
13-day outlook — past day 10 this is an outlook from the end of the GFS run: expect differences of several degrees.
Morning
Partly cloudy
10°
Feels like 9°
Wind↑ SSE 9 km/h
Gusts30 km/h
Humidity 87 %
Evening
Partly cloudy
16°
Feels like 16°
Wind↑ SSE 18 km/h
Gusts44 km/h
Humidity 59 %
14-day outlook — past day 10 this is an outlook from the end of the GFS run: expect differences of several degrees.
Morning
Light rain
13°
Feels like 13°
Wind↑ SSE 18 km/h
Gusts46 km/h
Humidity 79 %
💧 1.2 mm
Chicago forecast in charts · next 7 days
The week ahead: highs and lows
▲ This week runs +8.2° warmer than usual
Highs Lows Usual for the season (1991–2020 average)
Hourly detail
Temperature (°C) Rain (mm) Wind (km/h)
Chicago climate: what a normal year looks like
The hottest stretch is July, when afternoons average 28 °C; the coldest is January, when nights average −7 °C. Between those two months the average temperature changes by 28 °C.
Nights typically freeze from December to March, the coldest averaging −7 °C in January.
From 15 h 13 min of daylight in late June to 9 h 08 min in late December.
There is no real dry season: monthly rainfall stays between 57 mm and 114 mm on average.
Forecast highs for the coming week average 19 °C, 3 °C warmer than a normal October (16 °C).
30-year averages (1991–2020)
Month
Typical high
Typical low
Rainfall
Jan
−1 °C
−7 °C
66 mm
Feb
1 °C
−6 °C
57 mm
Mar
6 °C
−1 °C
73 mm
Apr
13 °C
5 °C
114 mm
May
19 °C
11 °C
112 mm
Jun
25 °C
17 °C
102 mm
Jul
28 °C
20 °C
94 mm
Aug
26 °C
19 °C
98 mm
Sep
23 °C
15 °C
78 mm
Oct
16 °C
8 °C
87 mm
Nov
9 °C
3 °C
74 mm
Dec
2 °C
−4 °C
65 mm
Whole year
14 °C
7 °C
1,020 mm
Source: our own processing of the ERA5 reanalysis (Copernicus/ECMWF) for 41.85° N, 87.65° W, 1991–2020. ERA5 averages over a 0.25° grid (about 25 km): hills, a coastline or the heat of the city itself can shift local values by a degree or two.
Air you breathe in Chicago: pollution and pollen
2/6
Fair
European Air Quality Index (EAQI), from Copernicus CAMS
PM2.511µg/m³
PM1011µg/m³
Copernicus CAMS model, updated several times a day.
Rain radar around Chicago
Rain observed over the last two hours by official weather radars around Chicago, followed by the radar forecast for the next hour where the weather service provides one.
Rain radarLast two hours, then forecast where available · drag the timeline
Moon over Chicago
Waning gibbous
87 % illuminated · 18.3 days
Rise 18:05 Set 09:41
Fri30/1079%
Sat31/1069%
Sun1/1159%
Mon2/1149%Last quarter
Tue3/1138%
Wed4/1128%
Thu5/1119%
Fri6/1112%
Sat7/116%
Sun8/112%
Mon9/110%
Tue10/111%New moon
Moonrise and moonset in local time (America/Chicago); phase and lit fraction from a synodic calculation.
Look up a past day in Chicago
Curious about the weather in Chicago on a given day? Choose a date: we read it from the ERA5 reanalysis (ECMWF / Copernicus C3S), which runs until about a week ago.
Chicago weather at a glance
This page gathers everything about the weather in Chicago, Illinois: conditions now, the forecast for each part of the day and the trend for the coming week. At the moment the sky is “light rain”, it is 21 °C (feels like 24 °C) and the wind blows at 15 km/h.
Expected range today: 16 °C to 21 °C and around 3 mm of rain. The forecast comes from the AtmoAtlas engine, which combines ECMWF-AIFS, NOAA GFS and DWD ICON, adjusts cloud cover with METAR reports and uses convective energy (CAPE) to flag storms.
Use the Chicago forecast in your own website or app: one JSON call returns weather, air quality, tides and sun and moon times. The free key needs no card.
