Decatur (AL) Weather & Climate: Best Time to Visit

The climate in Decatur is known for significant temperature differences throughout the year, making the weather dynamic. Average maximum daytime temperatures range from a very warm 32°C (90°F) in August, the warmest time of the year, to a chilly 10°C (50°F) during cooler months like January.

At night, you can expect temperatures ranging from 21°C (70°F) in August to around -1°C (30°F) during January.

Check out our detailed temperature page for more information.

Temperature ranges by month

Decatur has a notably wet climate with abundant precipitation, recording 1412 mm (56 in) of rain/snowfall per year. While rainfall varies throughout the year, each season offers its own charm. December brings wetter days averaging 171 mm (6.7 in) of precipitation, spread over 12 rainy days.

In contrast, the driest month June experiences a drier climate, with about 82 mm (3.2 in) of rainfall spread across 11 rainy days. For more details, please visit our Decatur Precipitation page.

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

The average number of days each month with precipitation

The relative humidity is high throughout the year in Decatur.

The city experiences its highest humidity in July, reaching 73%. In April, the humidity drops to its lowest level at 63%. What does this mean? Read our detailed page on humidity levels for further details.

Relative humidity over the year