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
September's arrival aligns with a minor decrease in average high-temperatures, from August's warm 79.3°F (26.3°C) to an agreeable 72.3°F (22.4°C). September witnesses an average nighttime temperature of 52°F (11.1°C).Humidity
In Grassflat, the average relative humidity in September is 80%.Rainfall
In Grassflat, during September, the rain falls for 12.7 days and regularly aggregates up to 1.65" (42mm) of precipitation. Throughout the year, there are 159 rainfall days, and 23.46" (596mm) of precipitation is accumulated.Snowfall
In Grassflat, snow does not fall in June through September.Daylight
The average length of the day in September is 12h and 28min.On the first day of September, sunrise is at 6:39 am and sunset at 7:44 pm. On the last day of the month, sunrise is at 7:08 am and sunset at 6:55 pm EDT.
Sunshine
In Grassflat, the average sunshine in September is 8.4h.UV index
In Grassflat, the average daily maximum UV index in September is 3. A UV Index value of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to Sun's UV rays for average individuals.Note: The maximum UV index, 3 during September, leads to the following recommendations:
Be mindful. Individuals with a lighter skin tone may suffer burns in less than 30 minutes. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. Tightly woven clothing, when worn loosely, shields effectively against the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in September?
What is the average humidity in September?
How many days does it rain in September?
When it does not snow?
Does it snow in September?
How many hours of daylight does Grassflat have in September?
When is the sunrise / sunset in September?
How long on average sun shines in September?
What is the UV index reading in September?
Average temperature in September
Grassflat, PA
- Average high temperature in September: 72.3°F
The warmest month (with the highest average high temperature) is July (81.3°F).
The month with the lowest average high temperature is January (30.6°F).
- Average low temperature in September: 52°F
The month with the highest average low temperature is July (59.2°F).
The coldest month (with the lowest average low temperature) is January (18°F).
Average pressure in September
Grassflat, 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 (29.95"Hg).
Average wind speed in September
Grassflat, PA
- Average wind speed in September: 5.5mph
The windiest month (with the highest average wind speed) is January (8.5mph).
The calmest month (with the lowest average wind speed) is August (5mph).
Average humidity in September
Grassflat, PA
- Average humidity in September: 80%
The month with the highest relative humidity is February (85%).
The month with the lowest relative humidity is July (76%).
Average rainfall in September
Grassflat, PA
- Average rainfall in September: 1.65"
The wettest month (with the highest rainfall) is May (2.87").
The driest month (with the least rainfall) is November (1.42").
Average rainfall days in September
Grassflat, PA
- Average rainfall days in September: 12.7 days
The month with the highest number of rainy days is May (17.9 days).
The month with the least rainy days is January (8.1 days).
Average snowfall in September
Grassflat, PA
- Average snowfall in September: 0"
The month with the highest snowfall is January (6.02").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Grassflat, PA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (18.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Grassflat, PA
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in September: 8h and 2min
The months with the most sunshine are July and August (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 24min).
Average sunshine days in September
Grassflat, PA
- Average sunshine days in September: 15.4 days
The month with the most sunshine days is September (15.4 days).
The month with the least sunshine days is February (8.7 days).
Average UV index in September
Grassflat, PA
- Average UV index in September: 3
The months with the highest UV index are May, June, July and August (UV index 5).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in September
Grassflat, PA
- Average cloud cover in September: 43
The month with the most cloud cover is January (Cloud cover 67).
The months with the least cloud cover are July and August (Cloud cover 38).
Average visibility in September
Grassflat, PA
- Average visibility in September: 4mi
The months with the highest visibility are January, March, April, May, June, July, August, October, November and December (5mi).
The months with the lowest visibility are February and September (4mi).
Grassflat, Pennsylvania, USA
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