Willow Grove (PA) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Willow Grove.
Climate overview of Willow Grove
Temperatures in Willow Grove, Pennsylvania, United States of America, vary greatly throughout the year. July is the hottest month at 30°C (86°F), while January is the coldest at 4°C (39°F).
With around 1282 mm (50 in) of annual rain/snowfall, Willow Grove has a notably wet climate. However, this rain/snowfall is not evenly distributed — the city has very warm summers and cold winters. The wettest month is August. The sunniest month is July, with 9.2 hours of sunshine per day on average.
Willow Grove Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Willow Grove - and find the best time to visit.
Monthly Temperature in Willow Grove
The climate in Willow Grove is known for significant temperature differences throughout the year, making the weather dynamic. Average daytime temperatures reach a very warm 30°C (86°F) in July. In January, the coolest month of the year, temperatures drop to a chilly 4°C (39°F).
At night, temperatures range from around 20°C (68°F) in July to -5°C (23°F) in January.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Willow Grove
Willow Grove has a notably wet climate with abundant precipitation, recording 1282 mm (50 in) of rain/snowfall per year. Willow Grove experiences moderate seasonal variation in rainfall, with monthly averages ranging from 138 mm (5.4 in) in August, the wettest month, and 76 mm (3 in) in February, the driest month. For more details, please visit our Willow Grove 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 Willow Grove
Willow Grove can be enjoyed more throughout the sunniest month of July under a blue sky, with approximately 9.2 hours of sunshine daily. In contrast, the city experiences much darker days in December, with only 4.7 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
Water Temperature in Willow Grove
The mean water temperature over the year ranges from 5°C (41°F) in February to 25°C (77°F) in August.
Water temperature over the year
Humidity in Willow Grove by Month
The relative humidity is high throughout the year in Willow Grove.
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 Willow Grove
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
- Best for swimming: July, August and September.
- 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 Willow Grove
What is the best time to visit Willow Grove?
May, June, August and September typically offer the most optimal weather in Willow Grove. In contrast, January, February and December tend to have less optimal conditions. Willow Grove has very warm summers and cold winters.
What temperatures can I expect in Willow Grove?
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 Willow Grove get?
Annual rainfall is around 1282 mm (50 in). August is the wettest month with 138 mm (5.4 in), while February is the driest with 76 mm (3 in).
How sunny is Willow Grove?
Willow Grove 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, Willow Grove enjoys abundant sunshine.
Willow Grove 3-Day Forecast
Willow Grove (PA) 3-Day Forecast
Willow Grove on the map
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