Monthly climate averages for West Chicago, United States. Based on 10-year ERA5 reanalysis data.
Dfa Hot-Summer Continental
Climate OverviewWest Chicago, United States in September has warm conditions, with highs averaging 24.7°C (76°F).
This month falls at the beginning of Autumn.
Daily highs in September gradually drop from around 26°C (79°F) at the start to 22°C (72°F) by month's end.
September sees fairly even rainfall, totalling about 80 mm across the month.
Expect around 10.0h of sunshine at the start of September, decreasing to 8.6h by the end.
The warmest days tend to fall around the 18th, averaging 26.6°C (80°F).
Compared to August, this month is about 3°C cooler with 2 fewer rainy days. Temperatures begin dropping heading into October.
Daily averages based on historical data (2016–2025)
Daytime temperatures around 25°C (76°F) are ideal for full-day outdoor exploration.
Rain usually comes in shorter passing showers rather than all-day rain.
2 of the last 5 yearly records were warmer than this month's long-run average.
| Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | 0°C / -7°C | -4°C / -12°C | 9days (60 mm) Wet | 5h Fair | 74% Muggy | 2.1 Moderate | Poor | View Details |
| February | 3°C / -6°C | -1°C / -11°C | 7days (48 mm) Good | 6.9h Fair | 69% Muggy | 3.4 Moderate | Poor | View Details |
| March | 10°C / 0°C | 6°C / -4°C | 11days (91 mm) Wet | 7.6h Good | 67% Muggy | 4.5 Moderate | Poor | View Details |
| April | 15°C / 4°C | 13°C / 1°C | 13days (114 mm) Wet | 8.6h Good | 67% Muggy | 5.4 High | Fair | View Details |
| May | 21°C / 11°C | 21°C / 9°C | 13days (130 mm) Wet | 10h Excellent | 69% Muggy | 6.7 High | Good | View Details |
| June best | 27°C / 17°C | 29°C / 17°C | 12days (112 mm) Wet | 11.7h Excellent | 68% Muggy | 7.1 Very High | Excellent | View Details |
| July best | 28°C / 19°C | 31°C / 21°C | 12days (109 mm) Wet | 11.8h Excellent | 72% Muggy | 7 High | Excellent | View Details |
| August best | 27°C / 18°C | 30°C / 20°C | 11days (89 mm) Wet | 11.1h Excellent | 73% Muggy | 6.5 High | Excellent | View Details |
| September best | 25°C / 16°C | 25°C / 15°C | 9days (78 mm) Wet | 9.5h Good | 71% Muggy | 5.3 High | Excellent | View Details |
| October best | 17°C / 9°C | 15°C / 6°C | 9days (95 mm) Wet | 7.2h Good | 69% Muggy | 3.8 Moderate | Good | View Details |
| November | 9°C / 1°C | 5°C / -3°C | 7days (53 mm) Good | 6.1h Fair | 70% Muggy | 2.5 Moderate | Poor | View Details |
| December | 3°C / -4°C | -1°C / -8°C | 8days (53 mm) Wet | 5.1h Fair | 73% Muggy | 1.8 Low | Poor | View Details |
Summer clothing like shorts, t-shirts, and sundresses will be comfortable. Bring a light cardigan for air-conditioned spaces.
A waterproof jacket or compact umbrella is recommended for occasional showers.
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