Forsyth (IL) Weather & Climate: Best Time to Visit

The climate in Forsyth is known for significant temperature differences throughout the year, making the weather dynamic. On average, daytime temperatures range from a comfortable 30°C (86°F) in July to a very cold 2°C (36°F) in January.

Nighttime temperatures range from 18°C (64°F) in July to -8°C (18°F) in January.

Check out our detailed temperature page for more information.

Temperature ranges by month

Forsyth has a notably wet climate with abundant precipitation, recording 1052 mm (41 in) of rain/snowfall per year. The seasons in Forsyth bring significant changes in precipitation. The wettest month, June, receives high rainfall, with an average of 147 mm (5.8 in) of precipitation. This rainfall is distributed across 13 rainy days.

In contrast, the driest month, January, experiences much less snow/rainfall, totaling 44 mm (1.7 in) over 9 snowy/rainy days. These distinct seasonal differences provide diverse experiences throughout the year. For more details, please visit our Forsyth Precipitation page.

The mean monthly precipitation over the year, including rain, hail, and snow

The average number of days each month with precipitation

In Forsyth, summer days are longer and more sunny, with daily sunshine hours peaking at 10.7 hours in July. As the darker season arrives, the brightness of the sun becomes less. December sees a soft sun for only 4.3 hours per average day.

Visit our detailed sunshine hours page for more information.

Monthly hours of sunshine

Daily hours of sunshine

Daily percentage of sunshine

The relative humidity is high throughout the year in Forsyth.

The city experiences its highest humidity in December, reaching 78%. In April, the humidity drops to its lowest level at 65%. What does this mean? Read our detailed page on humidity levels for further details.

Relative humidity over the year