Peoria, IL weather and climate in 2025
Day
30 °C
Night
18 °C
Sea
0 °C
Precipitation
102 mm
in month
Rainy days
10 days
in month
Daylight
15 hours
average
Sunshine
10 hours
average
Humidity
72 %
Day
30 °C
Night
18 °C
Sea
0 °C
Precipitation
102 mm
in month
Rainy days
10 days
in month
Daylight
15 hours
average
Sunshine
10 hours
average
Humidity
72 %
Overview: Peoria, IL
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Weather overview for Peoria, IL
Weather overview
Peoria, Illinois experiences a range of temperatures throughout the year, with chilly winters that can drop to an average low of -9 °C (16 °F) in January to warm summers peaking at an average high of 30 °C (85 °F) in July. Precipitation patterns are also variable, with January typically being the driest month, receiving about 43 mm (1.71 in) of rainfall, and the wettest month being May with an average rainfall of 107 mm (4.22 in).
January weather
January in Peoria starts off with a chilly winter chill with daytime temperatures averaging a cool 0 °C (33 °F). Nighttime lows can dip down to -9 °C (16 °F) which means layers are essential. January often boasts the fewest wet days of the year at 9, leading to crisp and dry winter days.
February weather
As February arrives, Peoria remains cold with an average daytime high of 3 °C (37 °F). The nights are still freezing, averaging -7 °C (20 °F), so staying bundled up is important. While wet days are slightly less frequent than in January at 8, the weather can still pack a punch.
March weather
March sees the first signs of spring as temperatures rise to an average high of 10 °C (50 °F) during the day. Nighttime temperatures are still chilly at -1 °C (30 °F), but with 10 of wet days, the snow begins to give way to rain.
April weather
April showers bring May flowers to Peoria, with temperatures warming to a pleasant daytime high of 17 °C (63 °F). Nights are milder but can still be brisk averaging 5 °C (40 °F). Expect rain with an average of 11.
May weather
May in Peoria is when the city truly blooms with an average daytime high of 23 °C (73 °F) and milder nights at about 11 °C (51 °F). Acclaimed as the wettest month, there's an average of 12 of rain, so it’s smart to keep rain gear accessible.
June weather
Summer arrives in June with Peoria enjoying warm days with an average high of 28 °C (82 °F). The nights are comfortably warm with an average low of 16 °C (61 °F). June has a slight respite from the rain with 10 expected to be wet.
July weather
July represents the peak of summer with the highest temperatures in the year, reaching an average high of 30 °C (85 °F). The balmy nights have an average low of 18 °C (65 °F). Rain is still a possibility with an average of 10.
August weather
August in Peoria is only slightly cooler than July, with a daytime high averaging 29 °C (84 °F). The nights are still quite warm, with an average low of 17 °C (63 °F). On average, you can expect 9 of rain.
September weather
As summer concludes, September in Peoria brings more moderate temperatures with an average high around 25 °C (78 °F) and cooler nights at 12 °C (54 °F). An average of 9 experience rain, providing relief from the summer heat.
October weather
In October, the cool crisp air arrives in Peoria with daytime temperatures averaging 18 °C (65 °F). Nighttime can feel quite brisk with an average of 6 °C (42 °F). With an average of 9 for rain, umbrellas should be kept close at hand.
November weather
November in Peoria ushers in colder temperatures with a daytime high around 10 °C (50 °F). As the nights grow colder averaging 0 °C (32 °F), winter clothing becomes necessary. Precipitation is slightly more frequent than October at 9.
December weather
December in Peoria brings back the winter chill, with average daytime highs of just 2 °C (36 °F) and cold nights dipping to an average of -6 °C (21 °F). An average of 9 have precipitation, and the holidays often feature picturesque snowscapes.
FAQs
How should I dress for a January day in Peoria, IL?
Dressing in warm layers is crucial for January in Peoria, IL. Expect to wear heavy coats, hats, gloves, and thermal clothing to stay comfortable against the average high of 0 °C (33 °F) and biting nights of -9 °C (16 °F).
Is February in Peoria as cold as January?
February in Peoria is marginally warmer with daytime highs around 3 °C (37 °F), but it's still quite cold, especially at night with lows of -7 °C (20 °F)—so remain prepared for the cold!
Does Peoria warm up in March?
Yes, March marks the beginning of warmer days in Peoria with an average high of 10 °C (50 °F), but nights can still be quite cold, so a mix of winter and spring attire is appropriate.
Is April a good time to start outdoor activities in Peoria?
April's warmer days averaging 17 °C (63 °F) make it a great time to begin enjoying outdoor activities in Peoria, although nights still require a jacket.
What temperatures can I expect during the day in May in Peoria?
May brings warmer days to Peoria with an average high of 23 °C (73 °F) which is perfect for enjoying spring's full bloom, but still grab a light jacket for the evenings.
What kind of weather does June bring to Peoria, IL?
June offers invitingly warm weather in Peoria with daytime highs around 28 °C (82 °F), perfect for summer activities, and pleasant nights that may require just a light cover-up.
Is July the hottest month in Peoria?
July indeed has the highest daytime temperatures in Peoria, topping off at an average high of 30 °C (85 °F), so summertime cool-offs are a must!
Does August continue to be hot in Peoria?
August maintains much of July's heat with only a slight dip to a daily high of 29 °C (84 °F), so air conditioning and trips to the lake remain on the agenda.
Is September a pleasant month weather-wise in Peoria?
September is a lovely transition month with comfortable daytime temperatures of 25 °C (78 °F), signaling the start of a beautiful autumn in Peoria.
Are October days in Peoria warm enough for outdoor activities?
Outdoor activities are still very much enjoyable in October with mild temps averaging 18 °C (65 °F) offering perfect weather for fall festivities.
What's the temperature like in Peoria during November?
November sees a significant drop in temperature in Peoria with an average high of 10 °C (50 °F) and the approach of winter should prompt you to bundle up.
How cold does it get in Peoria during December?
December brings the cold in Peoria, with highs around 2 °C (36 °F) and lows of -6 °C (21 °F), so heavy winter wear is essential for comfort in this festive month.
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