Harrisburg (PA) Weather & Climate: Best Time to Visit

The climate in Harrisburg is known for significant temperature differences throughout the year, making the weather dynamic. Average maximum daytime temperatures range from a comfortable 30°C (86°F) in July, the warmest time of the year, to a chilly 3°C (37°F) during cooler months like January.

At night, you can expect temperatures ranging from 19°C (66°F) in July to around -6°C (21°F) during January.

Check out our detailed temperature page for more information.

Temperature ranges by month

Harrisburg has a notably wet climate with abundant precipitation, recording 1195 mm (47 in) of rain/snowfall per year. While rainfall varies throughout the year, each season offers its own charm. June brings wetter days averaging 135 mm (5.3 in) of precipitation, spread over 14 rainy days.

In contrast, the driest month November experiences a drier climate, with about 65 mm (2.6 in) of rainfall spread across 9 rainy days. For more details, please visit our Harrisburg Precipitation page.

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

The average number of days each month with precipitation

Seasonal changes in sunshine hours are quite dramatic in Harrisburg. While July receives considerable daily sunshine with up to 10.3 hours, December marks the darkest time of the year, where sunshine is scarce with only 4.2 hours of sunlight per 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 Harrisburg.

The city experiences its highest humidity in September, reaching 73%. In April, the humidity drops to its lowest level at 59%. What does this mean? Read our detailed page on humidity levels for further details.

Relative humidity over the year