Pontiac (IL) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Pontiac.
Climate overview of Pontiac
Temperatures in Pontiac, Illinois, United States of America, vary greatly throughout the year. July is the hottest month at 29°C (84°F), while January is the coldest at 0°C (32°F).
The city has a wet climate, receiving around 1022 mm (40 in) of rain/snowfall per year. Despite the high annual total, it has warm summers and very cold winters. July is the wettest month.
Pontiac Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Pontiac - and find the best time to visit.
Monthly Temperature in Pontiac
The climate in Pontiac is known for significant temperature differences throughout the year, making the weather dynamic. On average, daytime temperatures range from a comfortable 29°C (84°F) in July to a very cold 0°C (32°F) in January.
Nighttime temperatures range from 18°C (64°F) in July to -9°C (16°F) in January.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Pontiac
Pontiac has a notably wet climate with abundant precipitation, recording 1022 mm (40 in) of rain/snowfall per year. The seasons in Pontiac bring significant changes in precipitation. The wettest month, July, receives high rainfall, with an average of 111 mm (4.4 in) of precipitation. This rainfall is distributed across 10 rainy days.
In contrast, the driest month, January, experiences much less snowfall, totaling 50 mm (2 in) over 9 snowy days. These distinct seasonal differences provide diverse experiences throughout the year. For more details, please visit our Pontiac 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 Pontiac
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: May, June, July, August, September and October
- Warmest weather: June, July and August
- 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 Pontiac
What is the best time to visit Pontiac?
May, June, July, August, September and October typically offer the most optimal weather in Pontiac. In contrast, January, February, March, November and December tend to have less optimal conditions. Pontiac has warm summers and very cold winters.
What temperatures can I expect in Pontiac?
Daytime highs range from 0°C (32°F) in January to 29°C (84°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 Pontiac get?
Annual rainfall is around 1022 mm (40 in). July is the wettest month with 111 mm (4.4 in), while January is the driest with 50 mm (2 in).
Pontiac 3-Day Forecast
Pontiac (IL) 3-Day Forecast
Pontiac on the map
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