September weather forecastMonessen, PA
September
Weather in September
The first month of the autumn, September, is also a moderately hot month in Monessen, Pennsylvania, with an average temperature ranging between max 75.4°F (24.1°C) and min 55°F (12.8°C).Temperature
As August transitions into September, Monessen sees a gentle drop in the average high-temperature, transitioning from a warm 81.9°F (27.7°C) to a still moderately hot 75.4°F (24.1°C). The low-temperature averages to a cool 55°F (12.8°C) during the nights of September.Humidity
In Monessen, the average relative humidity in September is 78%.Rainfall
In Monessen, in September, it is raining for 14.3 days, with typically 2.4" (61mm) of accumulated precipitation. In Monessen, during the entire year, the rain falls for 191.3 days and collects up to 35.24" (895mm) of precipitation.Snowfall
In Monessen, snow does not fall in June through September.Daylight
The average length of the day in September is 12h and 26min.On the first day of the month, sunrise is at 6:47 am and sunset at 7:50 pm. On the last day of September, sunrise is at 7:15 am and sunset at 7:02 pm EDT.
Sunshine
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 average individuals.Note: The maximum UV index of 4 during September leads to these instructions:
Make use of precautions - Suggestions to resist sunburn are communicated. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Monessen, PA
- Average high temperature in September: 75.4°F
The warmest month (with the highest average high temperature) is July (82.9°F).
The month with the lowest average high temperature is January (34°F).
- Average low temperature in September: 55°F
The month with the highest average low temperature is July (61.5°F).
The coldest month (with the lowest average low temperature) is January (21.2°F).
Average pressure in September
Monessen, PA
- Average pressure in September: 30.05"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
Monessen, PA
- Average wind speed in September: 5mph
The windiest month (with the highest average wind speed) is January (7.9mph).
The calmest month (with the lowest average wind speed) is August (4.6mph).
Average humidity in September
Monessen, PA
- Average humidity in September: 78%
The months with the highest relative humidity are January and February (84%).
The month with the lowest relative humidity is August (76%).
Average rainfall in September
Monessen, PA
- Average rainfall in September: 2.4"
The wettest month (with the highest rainfall) is May (3.78").
The driest month (with the least rainfall) is November (2.13").
Average rainfall days in September
Monessen, PA
- Average rainfall days in September: 14.3 days
The month with the highest number of rainy days is May (21.8 days).
The months with the least rainy days are January and February (11.7 days).
Average snowfall in September
Monessen, PA
- Average snowfall in September: 0"
The month with the highest snowfall is January (6.26").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Monessen, PA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (17.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Monessen, 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 August (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 3h and 0min).
Average sunshine days in September
Monessen, PA
- Average sunshine days in September: 13.7 days
The month with the most sunshine days is November (14.3 days).
The month with the least sunshine days is January (6.8 days).
Average UV index in September
Monessen, PA
- Average UV index in September: 4
The months with the highest UV index are May, June and July (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in September
Monessen, PA
- Average cloud cover in September: 37
The month with the most cloud cover is January (Cloud cover 68).
The month with the least cloud cover is August (Cloud cover 33).
Average visibility in September
Monessen, PA
- Average visibility in September: 5mi
The months with the highest visibility are April, August and November (6mi).
The months with the lowest visibility are January and February (4mi).
