Cicero, Illinois Weather
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Climate of Cicero: monthly averages
Based on 25 years of satellite and reanalysis data (2001-2025), July is usually the hottest month in Cicero, 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 Cicero, 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 Cicero. Values describe typical conditions, not a forecast.
About Cicero weather
Cicero sits within Illinois's humid continental climate, shaped by its Great Lakes and prairie geography, about 11 km west of Chicago. Conditions turn hot with warm, humid summers (June–August). By December, expect cold winters (December–February) with regular snow, colder near Lake Michigan. This page shows live, auto-refreshing weather for Cicero: 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
Cicero is about 11 km west of Chicago, in Illinois.
Cicero 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 Cicero's exact coordinates. No fixed schedule, the page updates whenever you load it.
July is usually the hottest month in Cicero, 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.
Cicero 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 Cicero, with mild daytime temperatures and little rain.
In November Cicero 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.
Live temperature for Cicero is shown at the top of this page and refreshes automatically — see the hourly breakdown below for how it changes through the day.
Cicero'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.