September weather forecastPlainfield, PA
September
Weather in September
The first month of the autumn, September, is also a moderately hot month in Plainfield, Pennsylvania, with temperature in the range of an average low of 55.4°F (13°C) and an average high of 74.3°F (23.5°C).Temperature
In Plainfield, the average high-temperature in September gently drops from 81.3°F (27.4°C) in August to a still moderately hot 74.3°F (23.5°C). Plainfield, during September, witnesses an average low-temperature of 55.4°F (13°C).Humidity
In September, the average relative humidity is 79%.Rainfall
September is the month with the least rainfall. Rain falls for 13 days and accumulates 1.97" (50mm) of precipitation.Snowfall
June through September are months without snowfall.Daylight
The average length of the day in September is 12h and 27min.On the first day of the month, sunrise is at 6:37 am and sunset at 7:40 pm. On the last day of September, sunrise is at 7:05 am and sunset at 6:52 pm EDT.
Sunshine
In Plainfield, the average sunshine in September is 8.7h.UV index
In September, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for the ordinary person.Note: In September, the maximum UV index of 4 suggests these recommendations:
Ensure safety - Imperative it is to shield skin and eyes from damage. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. Loose clothes with a tight weave are optimal for safeguarding yourself against the Sun's rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Plainfield, PA
- Average high temperature in September: 74.3°F
The warmest month (with the highest average high temperature) is July (83.8°F).
The month with the lowest average high temperature is January (34.7°F).
- Average low temperature in September: 55.4°F
The month with the highest average low temperature is July (62.8°F).
The coldest month (with the lowest average low temperature) is January (21.9°F).
Average pressure in September
Plainfield, PA
- Average pressure in September: 30.06"Hg
The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).
Average wind speed in September
Plainfield, PA
- Average wind speed in September: 5.2mph
The windiest month (with the highest average wind speed) is January (7.9mph).
The calmest months (with the lowest average wind speed) are July and August (4.7mph).
Average humidity in September
Plainfield, PA
- Average humidity in September: 79%
The months with the highest relative humidity are February, May and October (80%).
The months with the lowest relative humidity are April and July (76%).
Average rainfall in September
Plainfield, PA
- Average rainfall in September: 1.97"
The wettest month (with the highest rainfall) is May (3.11").
The driest month (with the least rainfall) is September (1.97").
Average rainfall days in September
Plainfield, PA
- Average rainfall days in September: 13 days
The month with the highest number of rainy days is May (17.9 days).
The month with the least rainy days is January (7.9 days).
Average snowfall in September
Plainfield, PA
- Average snowfall in September: 0"
The month with the highest snowfall is January (4.53").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Plainfield, PA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (8.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Plainfield, PA
- Average daylight in September: 12h and 24min
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 42min
The month with the most sunshine is July (Average sunshine: 10h and 24min).
The month with the least sunshine is February (Average sunshine: 4h and 24min).
Average sunshine days in September
Plainfield, PA
- Average sunshine days in September: 15 days
The month with the most sunshine days is November (18.7 days).
The month with the least sunshine days is May (11 days).
Average UV index in September
Plainfield, PA
- Average UV index in September: 4
The months with the highest UV index are May, June and July (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
Plainfield, PA
- Average cloud cover in September: 38
The month with the most cloud cover is February (Cloud cover 52).
The month with the least cloud cover is July (Cloud cover 32).
Average visibility in September
Plainfield, PA
- Average visibility in September: 5mi
The months with the highest visibility are April, June, July, August, November and December (6mi).
The months with the lowest visibility are January, February, March, May, September and October (5mi).
