Horsham (PA) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Horsham.
Climate overview of Horsham
The climate in Horsham, Pennsylvania, United States of America, is marked by large temperature swings across the seasons, ranging from 30°C (86°F) in July to 4°C (39°F) in January.
The city receives considerable rain/snowfall, with around 1285 mm (51 in) annually. August is the wettest month. It has very warm summers and cold winters. July is the sunniest month, averaging 9.2 hours of sunshine per day.
Horsham Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Horsham - and find the best time to visit.
Monthly Temperature in Horsham
In Horsham, temperatures differ significantly between summer and winter months. Typically, average maximum daytime temperatures range from a very warm 30°C (86°F) in July to a chilly 4°C (39°F) in the coolest month, January.
Nights vary from 20°C (68°F) in July to around -5°C (23°F) during the colder months.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Horsham
Horsham experiences significant rain/snowfall throughout the year, averaging 1285 mm (51 in) of precipitation annually. Horsham offers a pleasant mix of wetter and slightly drier months. The difference in precipitation between the wettest month August (138 mm (5.4 in)) and the driest month February (75 mm (3 in)) is not too significant. For more details, please visit our Horsham Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Sunshine Hours in Horsham
For those who appreciate different seasons, Horsham serves as an ideal destination. Expect longer, more sun-filled days in July with an average of 9.2 hours of sunshine daily, and embrace the darker days in December, offering only 4.7 hours of daily sunlight.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Daily percentage of sunshine
Humidity in Horsham by Month
The relative humidity is high throughout the year in Horsham.
The city experiences its highest humidity in September, reaching 72%. In April, the humidity drops to its lowest level at 61%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Best Time to Visit Horsham
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, August and September
- Warmest weather: July and August
- Most sunshine: June and July
- Fewer rainy days: January, February, March, September and November
- Seasonal pattern: Very warm summers and cold winters
- Coldest conditions: January, with freezing nights around -5°C (23°F).
Frequently asked questions about the climate in Horsham
What is the best time to visit Horsham?
May, June, August and September typically offer the most optimal weather in Horsham. In contrast, January, February and December tend to have less optimal conditions. Horsham has very warm summers and cold winters.
What temperatures can I expect in Horsham?
Daytime highs range from 4°C (39°F) in January to 30°C (86°F) in July. Nighttime lows range from -5°C (23°F) to 20°C (68°F). Temperatures vary considerably through the year.
How much rain does Horsham get?
Annual rainfall is around 1285 mm (51 in). August is the wettest month with 138 mm (5.4 in), while February is the driest with 75 mm (3 in).
How sunny is Horsham?
Horsham receives around 2,500 hours of sunshine per year. July is the sunniest month with 275 hours, while December is the cloudiest with just 140 hours. Overall, Horsham enjoys abundant sunshine.
Horsham 3-Day Forecast
Horsham on the map
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