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 is characterized by a slight reduction in average high-temperature, easing from a moderately hot 76.3°F (24.6°C) in August to a pleasant 70.2°F (21.2°C). During the month of September, the temperature falls to an average of 50.9°F (10.5°C).Humidity
In Irvine, the average relative humidity in September is 82%.Rainfall
In Irvine, in September, during 13.9 rainfall days, 1.46" (37mm) of precipitation is typically accumulated. Throughout the year, there are 162.1 rainfall days, and 21.81" (554mm) of precipitation is accumulated.Snowfall
June through September are months without snowfall.Daylight
In September, the average length of the day is 12h and 28min.On the first day of the month, sunrise is at 6:43 am and sunset at 7:50 pm. On the last day of September, sunrise is at 7:13 am and sunset at 6:59 pm EDT.
Sunshine
In Irvine, the average sunshine in September is 8.1h.UV index
In Irvine, the average daily maximum UV index in September is 3. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for the average person.Note: A daily maximum UV index of 3 in September translates into the following instructions:
Put precautions into practice - Protective measures against sun-induced damage are advised. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average September temperature in Irvine?
What is the average humidity in September?
How much does it rain in September?
When it does not snow?
Does it snow in September?
How many hours of daylight does Irvine have in September?
When are sunrise and sunset in September in Irvine?
How long on average sun shines in September?
What is the UV index reading in September?
Average temperature in September
Irvine, PA
- Average high temperature in September: 70.2°F
The warmest month (with the highest average high temperature) is July (78.1°F).
The month with the lowest average high temperature is January (28.2°F).
- Average low temperature in September: 50.9°F
The month with the highest average low temperature is July (57.6°F).
The coldest month (with the lowest average low temperature) is January (16.9°F).
Average pressure in September
Irvine, PA
- Average pressure in September: 30.05"Hg
The month with the highest atmospheric pressure is November (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in September
Irvine, PA
- Average wind speed in September: 6.1mph
The windiest month (with the highest average wind speed) is January (9.3mph).
The calmest months (with the lowest average wind speed) are July and August (5.7mph).
Average humidity in September
Irvine, PA
- Average humidity in September: 82%
The month with the highest relative humidity is February (90%).
The month with the lowest relative humidity is May (80%).
Average rainfall in September
Irvine, PA
- Average rainfall in September: 1.46"
The wettest month (with the highest rainfall) is April (2.52").
The driest month (with the least rainfall) is March (1.42").
Average rainfall days in September
Irvine, PA
- Average rainfall days in September: 13.9 days
The month with the highest number of rainy days is May (17.9 days).
The month with the least rainy days is February (7.3 days).
Average snowfall in September
Irvine, PA
- Average snowfall in September: 0"
The month with the highest snowfall is December (6.77").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Irvine, PA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (22 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Irvine, PA
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in September: 8h and 1min
The months with the most sunshine are July and August (Average sunshine: 9h and 36min).
The month with the least sunshine is January (Average sunshine: 2h and 6min).
Average sunshine days in September
Irvine, PA
- Average sunshine days in September: 12.9 days
The month with the most sunshine days is September (12.9 days).
The month with the least sunshine days is January (5.1 days).
Average UV index in September
Irvine, PA
- Average UV index in September: 3
The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in September
Irvine, PA
- Average cloud cover in September: 44
The month with the most cloud cover is January (Cloud cover 80).
The months with the least cloud cover are July and August (Cloud cover 40).
Average visibility in September
Irvine, PA
- Average visibility in September: 5mi
The months with the highest visibility are March, April, May, June, July, September, October and November (5mi).
The months with the lowest visibility are January, February, August and December (4mi).
Irvine, Pennsylvania, USA
Weather forecast for your location
2. Allow the app to use your location