Willow Grove Weather in September

September in Willow Grove averages 25°C (77°F) during the day and 15°C (59°F) at night. Quite a bit of rainfall is typical this month, with around 109 mm (4.3 in) on average. An umbrella is a good idea.

Rainfall in Willow Grove in September

Records from the past 30 years suggest around 9 days of rain, with 109 mm (4.3 in) average for the month. When showers do arrive, they tend to be on the heavier side. Worth being prepared even if rain days are not that numerous.

Temperature in Willow Grove in September

Daytime temperatures in Willow Grove reach 25°C (77°F) in September, dropping to 15°C (59°F) at night. Conditions stay fairly consistent through the month, making it easier to plan what to wear. With overnight lows of 15°C (59°F), evenings can feel noticeably cooler than the daytime. An extra layer is a good idea, though the cool air makes for a good night's sleep.

Sunshine in Willow Grove in September

There are approximately 218 hours of sunshine this month, resulting in mostly clear days.

Average water temperature in September

The water is 22°C (72°F) this month — warm enough that getting in requires no effort at all. Good conditions for swimming, snorkeling, or just floating around.

If you favor pleasant temperatures and minimal rainfall, September is one of the best months to visit Willow Grove.

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• January
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For a detailed overview over the year and the best time to visit the United States of America, check out our Willow Grove's climate page.

Willow Grove Temperature in September

Min Temperature 15°C (59°F)  

Max Temperature 25°C (77°F)  

Water Temperature 22°C (72°F) *  

Chance of Rain 29%  

Precipitation 109 mm (4.3 in)  

Rainy days 9 days  

Humidity 72% *  

Sunshine 218 hours *  

Percentage Sunshine 59% *  

* Data from: Philadelphia, the United States of America (21 KM, 13 Miles).

What to Wear in Willow Grove in September

Warm but pleasant conditions in Willow Grove in September. Focus on lightweight, maybe with natural fabrics, cotton blend shirts, comfortable shorts, and breathable footwear. A light cover-up for sun protection is smart too. Expect heavy rainfall, so bring good rain protection and waterproof bags. The water temperature sits at about 22°C (72°F), making it perfect for swimming and water activities. Don't forget to pack your favorite swimwear and perhaps some snorkel gear. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.

What To Do in Willow Grove in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

9/10

Cycling

7/10

Walking

7/10

Camping

6/10

Outdoor sports

7/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our Willow Grove's climate page.

More climate data for Willow Grove

Temperature Rainfall Sunshine Humidity Water Temp

See the full Willow Grove climate overview or explore weather in the United States of America.