Berwyn, Illinois Weather
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Climate of Berwyn: monthly averages
Based on 25 years of satellite and reanalysis data (2001-2025), July is usually the hottest month in Berwyn, with average daytime highs around 25°C. February is the coolest, when nights typically fall to about -5°C and frost is possible on the coldest nights. That is a wide yearly range of roughly 30°C, so the seasons feel very different from each other.
The area receives about 980 mm of rain in a typical year. Most of it falls from May to June and August, and May is the wettest month at roughly 117 mm.
For outdoor plans and travel, July and September usually offer the most comfortable weather in Berwyn, with mild days and relatively little rain.
| Month | Avg high | Avg low | Rainfall | Humidity |
|---|---|---|---|---|
| Jan | 0° | -5° | 48 mm | 86% |
| Feb | 0° | -5° | 54 mm | 84% |
| Mar | 5° | -1° | 62 mm | 82% |
| Apr | 10° | 4° | 95 mm | 81% |
| May | 15° | 9° | 117 mm | 83% |
| Jun | 21° | 15° | 102 mm | 81% |
| Jul | 25° | 20° | 95 mm | 78% |
| Aug | 25° | 20° | 105 mm | 77% |
| Sep | 22° | 16° | 86 mm | 76% |
| Oct | 15° | 10° | 99 mm | 77% |
| Nov | 9° | 4° | 61 mm | 80% |
| Dec | 3° | -2° | 58 mm | 85% |
Source: NASA POWER (MERRA-2 reanalysis), averaged over the roughly 50 km grid area around Berwyn. Values describe typical conditions, not a forecast.
About Berwyn weather
Berwyn is a place in Illinois's humid continental climate, shaped by its Great Lakes and prairie geography, located about 14 km west of Chicago. Berwyn gets warm, humid summers (June–August) each year. Berwyn closes out the year with cold winters (December–February) with regular snow, colder near Lake Michigan. This page shows live, auto-refreshing weather for Berwyn: current conditions, an hourly breakdown, a 16-day outlook, a date-lookup tool for any past or future date, and real-time air quality, sourced from Open-Meteo. Local timezone: America/Chicago.
Frequently asked questions
Berwyn is about 14 km west of Chicago, in Illinois.
Berwyn sees cold winters (December–February) with regular snow, colder near Lake Michigan.
The live current conditions, hourly forecast and 16-day outlook above are pulled in real time for Berwyn's exact coordinates. No fixed schedule, the page updates whenever you load it.
July is usually the hottest month in Berwyn, with average daytime highs of about 25°C and nights around 20°C.
The coldest nights come in February, when the average low is about -5°C and daytime highs reach around 0°C. Frost is possible on clear, calm nights.
Berwyn receives about 980 mm of rain in a typical year. May is the wettest month at roughly 117 mm, and the main rainy period is May to June and August.
July and September usually offer the most comfortable weather in Berwyn, with mild daytime temperatures and little rain.
In November Berwyn typically sees daytime highs near 9°C and lows near 4°C, with about 61 mm of rain over the month and average humidity around 80%. Check the live forecast above for this week's actual conditions.
Up to 16 days ahead using the extended forecast and date picker above; further-out or historical dates use the same date lookup tool.
The current temperature for Berwyn updates automatically at the top of this page — scroll to the hourly strip below to see how it's expected to change over the day.
Berwyn's day-to-day weather follows the broader pattern of Illinois described above. See the hourly weather forecast or the air quality index for more detail.