Mettawa (IL) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Mettawa.
Climate overview of Mettawa
Mettawa, Illinois, United States of America, experiences significant temperature variation throughout the year. Summers bring daytime highs of 28°C (82°F) in July, while winters cool to -1°C (30°F) in January.
Rain/snowfall is high, totalling around 1015 mm (40 in) per year. July is the wettest month and January the driest. The city also experiences warm summers and very cold winters. The most sunshine falls in July, with an average of 10.6 hours of daily sunshine.
Mettawa Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Mettawa - and find the best time to visit.
Monthly Temperature in Mettawa
Depending on the time of the year, temperatures range from comfortable to very cold in Mettawa. Average maximum daytime temperatures range from a comfortable 28°C (82°F) in July, the warmest time of the year, to a very cold -1°C (30°F) during cooler months like January.
At night, you can expect temperatures ranging from 18°C (64°F) in July to around -9°C (16°F) during January.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Mettawa
Mettawa has a relatively rain/snowy climate with high precipitation levels, averaging 1015 mm (40 in) of rain/snowfall annually. Significant seasonal changes in precipitation occur throughout the year. In the wettest month, July it receives high rainfall, averaging 116 mm (4.6 in) of precipitation, recorded across 11 rainy days. In contrast, the driest month January brings less snowfall, with 43 mm (1.7 in) over 10 snowy days. For more details, please visit our Mettawa Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Sunshine Hours in Mettawa
Seasonal changes in sunshine hours are quite dramatic in Mettawa. While July receives considerable daily sunshine with up to 10.6 hours, December marks the darkest time of the year, where sunshine is scarce with only 3.6 hours of sunlight per day.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Daily percentage of sunshine
Humidity in Mettawa by Month
The relative humidity is high throughout the year in Mettawa.
The city experiences its highest humidity in December, reaching 76%. In May, the humidity drops to its lowest level at 64%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Best Time to Visit Mettawa
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: July and August
- Most sunshine: June and July
- Fewer rainy days: January, February, March, September and November
- Seasonal pattern: Warm summers and very cold winters
- Coldest conditions: January, with freezing nights around -9°C (16°F).
Frequently asked questions about the climate in Mettawa
What is the best time to visit Mettawa?
September typically offers the most optimal weather in Mettawa. In contrast, January, February, March, November and December tend to have less optimal conditions. Mettawa has warm summers and very cold winters.
What temperatures can I expect in Mettawa?
Daytime highs range from -1°C (30°F) in January to 28°C (82°F) in July. Nighttime lows range from -9°C (16°F) to 18°C (64°F). Temperatures vary considerably through the year.
How much rain does Mettawa get?
Annual rainfall is around 1015 mm (40 in). July is the wettest month with 116 mm (4.6 in), while January is the driest with 43 mm (1.7 in).
How sunny is Mettawa?
Mettawa receives around 2,509 hours of sunshine per year. July is the sunniest month with 319 hours, while December is the cloudiest with just 107 hours. Overall, Mettawa enjoys abundant sunshine.
Mettawa 3-Day Forecast
Mettawa (IL) 3-Day Forecast
Mettawa on the map
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