Mattoon (IL) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Mattoon.
Climate overview of Mattoon
The climate in Mattoon, Illinois, United States of America, is marked by large temperature swings across the seasons, ranging from 30°C (86°F) in July to 2°C (36°F) in January.
The city receives considerable rain/snowfall, with around 1129 mm (44 in) annually. April is the wettest month. It has warm summers and cold winters.
Mattoon Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Mattoon - and find the best time to visit.
Monthly Temperature in Mattoon
In Mattoon, temperatures differ significantly between summer and winter months. Typically, average maximum daytime temperatures range from a comfortable 30°C (86°F) in July to a chilly 2°C (36°F) in the coolest month, January.
Nights vary from 19°C (66°F) in July to around -7°C (19°F) during the colder months.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Mattoon
Mattoon experiences significant rain/snowfall throughout the year, averaging 1129 mm (44 in) of precipitation annually. The climate in Mattoon shows significant variation throughout the year. Expect high rainfall in April, the wettest month, with an average of 149 mm (5.9 in) of precipitation over 12 rainy days.
In contrast, the driest month January offers drier and sunnier days, with around 56 mm (2.2 in) of snow/rainfall over 9 snowy/rainy days. For more details, please visit our Mattoon Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Best Time to Visit Mattoon
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: September
- Warmest weather: June, July and August
- Seasonal pattern: Warm summers and cold winters
- Coldest conditions: January, with freezing nights around -7°C (19°F).
Frequently asked questions about the climate in Mattoon
What is the best time to visit Mattoon?
September typically offers the most optimal weather in Mattoon. In contrast, January, February and December tend to have less optimal conditions. Mattoon has warm summers and cold winters.
What temperatures can I expect in Mattoon?
Daytime highs range from 2°C (36°F) in January to 30°C (86°F) in July. Nighttime lows range from -7°C (19°F) to 19°C (66°F). Temperatures vary considerably through the year.
How much rain does Mattoon get?
Annual rainfall is around 1129 mm (44 in). April is the wettest month with 149 mm (5.9 in), while January is the driest with 56 mm (2.2 in).
Mattoon 3-Day Forecast
Mattoon on the map
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