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
As September commences, the average high-temperature subtly reduces, transitioning from a warm 80.1°F (26.7°C) in August to a pleasant 73°F (22.8°C). During the nights in September, Riverside experiences a consistent average temperature of 52.9°F (11.6°C).Humidity
In Riverside, the average relative humidity in September is 79%.Rainfall
In Riverside, in September, during 12.4 rainfall days, 2.17" (55mm) of precipitation is typically accumulated. In Riverside, during the entire year, the rain falls for 157.2 days and collects up to 30.43" (773mm) of precipitation.Snowfall
In Riverside, snow does not fall in June through September.Daylight
In Riverside, the average length of the day in September is 12h and 27min.On the first day of September, sunrise is at 6:34 am and sunset at 7:38 pm. On the last day of the month, sunrise is at 7:02 am and sunset at 6:49 pm EDT.
Sunshine
In Riverside, the average sunshine in September is 8.7h.UV index
In Riverside, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for the ordinary person.Note: In September, a regular UV index of 4 translates into these guidelines:
Take necessary precautions - Protection from skin and eye injury is mandatory. During midday, the Sun's radiation is strongest, and it's advisable to reduce direct exposure. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key.
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?
What is the average length of the day in September?
What time are sunrise and sunset in September in Riverside?
How long on average sun shines in September?
What is the UV index reading in September?
Average temperature in September
Riverside, PA
- Average high temperature in September: 73°F
The warmest month (with the highest average high temperature) is July (81.9°F).
The month with the lowest average high temperature is January (32°F).
- Average low temperature in September: 52.9°F
The month with the highest average low temperature is July (60.4°F).
The coldest month (with the lowest average low temperature) is January (19.8°F).
Average pressure in September
Riverside, PA
- Average pressure in September: 30.07"Hg
The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in September
Riverside, PA
- Average wind speed in September: 5.3mph
The windiest months (with the highest average wind speed) are March and April (8mph).
The calmest month (with the lowest average wind speed) is August (4.7mph).
Average humidity in September
Riverside, PA
- Average humidity in September: 79%
The month with the highest relative humidity is February (82%).
The month with the lowest relative humidity is April (76%).
Average rainfall in September
Riverside, PA
- Average rainfall in September: 2.17"
The wettest month (with the highest rainfall) is July (3.27").
The driest month (with the least rainfall) is January (2.05").
Average rainfall days in September
Riverside, PA
- Average rainfall days in September: 12.4 days
The month with the highest number of rainy days is July (17.8 days).
The month with the least rainy days is January (8.3 days).
Average snowfall in September
Riverside, PA
- Average snowfall in September: 0"
The month with the highest snowfall is February (4.8").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Riverside, PA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (9.9 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Riverside, 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 4min
The month with the most sunshine is July (Average sunshine: 10h and 12min).
The month with the least sunshine is February (Average sunshine: 4h and 0min).
Average sunshine days in September
Riverside, PA
- Average sunshine days in September: 14.7 days
The month with the most sunshine days is November (18.3 days).
The month with the least sunshine days is July (10.5 days).
Average UV index in September
Riverside, PA
- Average UV index in September: 4
The month with the highest UV index is June (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
Riverside, PA
- Average cloud cover in September: 38
The months with the most cloud cover are January, February and December (Cloud cover 56).
The month with the least cloud cover is July (Cloud cover 34).
Average visibility in September
Riverside, PA
- Average visibility in September: 5mi
The months with the highest visibility are March, April, November and December (6mi).
The months with the lowest visibility are January, February, May, June, July, August, September and October (5mi).
Riverside, Pennsylvania, USA
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