Belleville, IL weather and climate in 2025
Day
21 °C
Night
8 °C
Sea
0 °C
Precipitation
81 mm
in month
Rainy days
9 days
in month
Daylight
11 hours
average
Sunshine
7 hours
average
Humidity
69 %
Day
21 °C
Night
8 °C
Sea
0 °C
Precipitation
81 mm
in month
Rainy days
9 days
in month
Daylight
11 hours
average
Sunshine
7 hours
average
Humidity
69 %
Overview: Belleville, IL
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Weather overview for Belleville, IL
Weather overview
Located in Illinois, Belleville experiences a variety of weather patterns throughout the year, from cold and snowy winters to warm and humid summers. On average, daytime temperatures peak at 31 °C (88 °F) in July, while night temperatures can drop to as low as -5 °C (22 °F) in January. With a shifting count of rainy days across the months, residents and visitors should be prepared for 12 days of rainfall in May, the wettest month. Whether you're dressing for brisk morning walks or hot afternoons by the park, understanding Belleville's climate can guide your daily choices.
January weather
January in Belleville greets you with its chilly embrace, boasting a daytime high temperature of 4 °C (40 °F). With 7 days of precipitation, it's essential to layer up and prepare for potential snowy days.
February weather
February's cold breeze persists in Belleville with daytime temperatures reaching up to 7 °C (44 °F) and nights that often dip to -4 °C (25 °F). Residents may see 8 days of rain or snow within the month.
March weather
As spring approaches, March sees a notable rise in temperatures in Belleville with a daytime high of 13 °C (56 °F). The number of wet days jumps up to 10 days, signaling the beginning of the transition season.
April weather
Belleville's weather in April offers more warmth with average high temperatures of 19 °C (67 °F). With rain occurring on 11 days of the month, April showers indeed bring May flowers.
May weather
May marks the wettest month in Belleville, with rain expected on 12 days. Daytime temperatures continue to climb, reaching an average high of 24 °C (76 °F).
June weather
June in Belleville heats up with summer around the corner, boasting an average high temperature of 29 °C (84 °F). Rain is seen less frequently, occurring on an average of 11 days.
July weather
July's blazing heat defines Belleville's midsummer as temperatures soar to an average high of 31 °C (88 °F). Yet, with 10 days of rain, there’s a chance for cooling down from the heat.
August weather
August's high temperatures in Belleville are similar to July, averaging 31 °C (87 °F). The hydrangeas may thrive as the rain does not shy away, with 10 days of precipitation to expect.
September weather
As fall approaches, September invites Belleville into cooler days with an average high of 27 °C (81 °F). The rain eases slightly to an average of 8 days.
October weather
October in Belleville offers brisk temperatures, averaging a high of 21 °C (69 °F). Rain is seen around 9 days, perfect for witnessing the warm fall colors.
November weather
The crisp air of November ushers in cooler days in Belleville, with temperatures topping off at an average of 13 °C (56 °F). Expect to see rain on 9 days throughout the month.
December weather
December in Belleville is marked by a clear drop in temperature, with daytime highs reaching only an average of 6 °C (43 °F). Rainfall remains frequent at an average of 8 days.
FAQs
How cold can it get at night in Belleville during January?
January nights in Belleville can be quite cold, with an average low temperature of -5 °C (22 °F). Be sure to have warm blankets and heating prepared for the winter chill.
What are the daytime temperatures like in Belleville for February?
The days in February can show a slight temperature increase with an average high of 7 °C (44 °F), hinting at the forthcoming spring.
What can I expect from March weather in Belleville?
March in Belleville brings a mix of chilly and mild days. With an average high of 13 °C (56 °F), you'll experience the early signs of spring but don’t put away your winter coat just yet.
Are April days in Belleville warm enough for outdoor activities?
April days become pleasantly warm with an average high of 19 °C (67 °F). It's a great time to start enjoying outdoor activities as you watch nature revive.
What type of weather does May bring to Belleville?
May brings a mix of warm temperatures with a daily high averaging 24 °C (76 °F), setting the stage for summer, but be aware of the potential increase in humidity.
What is the typical temperature range for Belleville in June?
June days in Belleville can be quite balmy with temperatures ranging broadly, but expect daytime highs to hit around 29 °C (84 °F). Perfect for enjoying long days under the sun.
How hot does it get in Belleville during July?
Hot is the operative word for Belleville in July, with scorching average daytime highs of 31 °C (88 °F). Staying hydrated and protected from the sun is crucial.
What can I expect from the weather in Belleville during August?
Belleville in August remains hot and summery with a high temperature of 31 °C (87 °F), and you’ll want to take advantage of the warm evenings as well.
Do temperatures in Belleville start to cool down in September?
Yes, September is the beginning of the transition to cooler weather in Belleville, with a noticeable drop in the average high temperature to 27 °C (81 °F).
Are temperatures in Belleville comfortable in October for outdoor events?
Outdoor enthusiasts can rejoice as October brings comfortable temperatures with an average high of 21 °C (69 °F) – ideal for enjoying autumn's palette.
How does the temperature in Belleville change as winter approaches?
As winter nears, you’ll feel a distinct chill with November's average high temperature dipping to 13 °C (56 °F), with colder nights hinting at the coming winter.
Will I experience freezing temperatures in Belleville during December?
December days tend to feel quite chilly with a high of 6 °C (43 °F) on average, but nighttime temperatures can dip below freezing, so bundle up!
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