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
The onset of September is marked by a minor decrease in temperature, transitioning from a moderately hot 83.5°F (28.6°C) in August to a still warm 76.6°F (24.8°C). During September, the temperature is averaged to a low of 60.8°F (16°C) at night.Humidity
The average relative humidity in September is 76%.Rainfall
In Rose Valley, in September, it is raining for 12.6 days, with typically 1.73" (44mm) of accumulated precipitation. In Rose Valley, during the entire year, the rain falls for 148.4 days and collects up to 25.94" (659mm) of precipitation.Snowfall
In Rose Valley, snow does not fall in June through October.Daylight
The average length of the day in September is 12h and 26min.On the first day of the month, sunrise is at 6:30 am and sunset at 7:32 pm. On the last day of September, sunrise is at 6:57 am and sunset at 6:45 pm EDT.
Sunshine
In September, the average sunshine is 8.9h.UV index
In Rose Valley, the average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for ordinary individuals.Note: In September, the maximum UV index of 5 suggests this advice:
Put precautions into practice - Ensuring skin and eye safety is a necessity. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage.
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?
What is the average length of the day in September?
When is the sunrise / sunset in September in Rose Valley?
How long on average sun shines in September?
How high is the UV index in September?
Average temperature in September
Rose Valley, PA
- Average high temperature in September: 76.6°F
The warmest month (with the highest average high temperature) is July (85.6°F).
The month with the lowest average high temperature is January (37.4°F).
- Average low temperature in September: 60.8°F
The month with the highest average low temperature is July (68.7°F).
The coldest month (with the lowest average low temperature) is January (25.7°F).
Average pressure in September
Rose Valley, PA
- Average pressure in September: 30.05"Hg
The month with the highest atmospheric pressure is November (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in September
Rose Valley, PA
- Average wind speed in September: 5.9mph
The windiest month (with the highest average wind speed) is March (8.6mph).
The calmest months (with the lowest average wind speed) are July and August (5.5mph).
Average humidity in September
Rose Valley, PA
- Average humidity in September: 76%
The months with the highest relative humidity are February, October and December (77%).
The month with the lowest relative humidity is April (71%).
Average rainfall in September
Rose Valley, PA
- Average rainfall in September: 1.73"
The wettest month (with the highest rainfall) is August (3.11").
The driest month (with the least rainfall) is January (1.61").
Average rainfall days in September
Rose Valley, PA
- Average rainfall days in September: 12.6 days
The month with the highest number of rainy days is July (17 days).
The month with the least rainy days is January (7.1 days).
Average snowfall in September
Rose Valley, PA
- Average snowfall in September: 0"
The month with the highest snowfall is March (2.32").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in September
Rose Valley, PA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (3.8 days).
The months with the least snowfall days are June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Rose Valley, 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 5min
The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is February (Average sunshine: 4h and 54min).
Average sunshine days in September
Rose Valley, PA
- Average sunshine days in September: 15.5 days
The month with the most sunshine days is January (20.8 days).
The month with the least sunshine days is July (11.3 days).
Average UV index in September
Rose Valley, PA
- Average UV index in September: 5
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, November and December (UV index 2).
Average cloud cover in September
Rose Valley, PA
- Average cloud cover in September: 37
The month with the most cloud cover is February (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 30).
Average visibility in September
Rose Valley, PA
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Rose Valley, Pennsylvania, USA
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