Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
In September, the average high-temperature in Downingtown marginally drops from a warm 81.1°F (27.3°C) in August to a still moderately hot 75°F (23.9°C). Downingtown records a consistent low-temperature of 57.7°F (14.3°C) during September nights.Humidity
In Downingtown, the average relative humidity in September is 79%.Rainfall
In Downingtown, in September, it is raining for 12.5 days, with typically 1.89" (48mm) of accumulated precipitation. Throughout the year, there are 145.6 rainfall days, and 26.81" (681mm) of precipitation is accumulated.Snowfall
June through September are months without snowfall.Daylight
In Downingtown, the average length of the day in September is 12h and 26min.On the first day of the month, sunrise is at 6:31 am and sunset at 7:33 pm. On the last day of September, in Downingtown, sunrise is at 6:58 am and sunset at 6:46 pm EDT.
Sunshine
In September, the average sunshine is 8.7h.UV index
The average daily maximum UV index in September in Downingtown, Pennsylvania, is 4. A UV Index estimate of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for the ordinary person.Note: In September, the maximum UV index of 4 suggests these recommendations:
Take precautions - Protection against sun damage is advised. Considering the Sun's intensity during midday, it's wise to minimize direct exposure. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly.
Frequently asked questions
What are September temperatures in Downingtown?
What is the average humidity in September in Downingtown?
How many days does it rain in September in Downingtown?
When it does not snow in Downingtown?
Does it snow in Downingtown in September?
How many hours of daylight does Downingtown have in September?
What time are sunrise and sunset in September in Downingtown?
How long on average sun shines in September in Downingtown?
How high is the UV index in September in Downingtown?
Average temperature in September
Downingtown, PA
- Average high temperature in September: 75°F
The warmest month (with the highest average high temperature) is July (84°F).
The month with the lowest average high temperature is January (35.4°F).
- Average low temperature in September: 57.7°F
The month with the highest average low temperature is July (66.2°F).
The coldest month (with the lowest average low temperature) is January (23.7°F).
Average pressure in September
Downingtown, PA
- Average pressure in September: 30.06"Hg
The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in September
Downingtown, PA
- Average wind speed in September: 5.6mph
The windiest months (with the highest average wind speed) are January and March (8.5mph).
The calmest months (with the lowest average wind speed) are July and August (5.2mph).
Average humidity in September
Downingtown, PA
- Average humidity in September: 79%
The months with the highest relative humidity are February, May and October (80%).
The month with the lowest relative humidity is April (75%).
Average rainfall in September
Downingtown, PA
- Average rainfall in September: 1.89"
The wettest month (with the highest rainfall) is August (3.31").
The driest month (with the least rainfall) is February (1.61").
Average rainfall days in September
Downingtown, PA
- Average rainfall days in September: 12.5 days
The month with the highest number of rainy days is May (16.8 days).
The month with the least rainy days is January (6.7 days).
Average snowfall in September
Downingtown, PA
- Average snowfall in September: 0"
The month with the highest snowfall is March (3.46").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Downingtown, PA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (4.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Downingtown, PA
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in September: 8h and 4min
The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).
Average sunshine days in September
Downingtown, PA
- Average sunshine days in September: 16.3 days
The month with the most sunshine days is December (20.5 days).
The month with the least sunshine days is May (12.3 days).
Average UV index in September
Downingtown, PA
- Average UV index in September: 4
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in September
Downingtown, PA
- Average cloud cover in September: 39
The month with the most cloud cover is February (Cloud cover 49).
The month with the least cloud cover is July (Cloud cover 32).
Average visibility in September
Downingtown, PA
- Average visibility in September: 5mi
The months with the highest visibility are January, February, March, April, June, July, August, October, November and December (6mi).
The months with the lowest visibility are May and September (5mi).
Downingtown, Pennsylvania, USA
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