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 start of September signals a gentle decrease in the average high-temperature, transitioning from 82.2°F (27.9°C) in August to a still moderately hot 76.5°F (24.7°C). During the month of September, an average low-temperature of 63.1°F (17.3°C) is recorded in Riverview.Humidity
The months with the highest humidity are May, August and September, with an average relative humidity of 79%.Rainfall
In Riverview, in September, it is raining for 13.6 days, with typically 2.44" (62mm) of accumulated precipitation. In Riverview, during the entire year, the rain falls for 167.5 days and collects up to 35.35" (898mm) of precipitation.Snowfall
In Riverview, snow does not fall in May through October.Daylight
The average length of the day in September is 12h and 26min.On the first day of September, sunrise is at 6:31 am and sunset at 7:32 pm. On the last day of the month, sunrise is at 6:57 am and sunset at 6:45 pm EDT.
Sunshine
The average sunshine in September is 9.2h.UV index
In September, the average daily maximum UV index is 5. A UV Index value of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for the ordinary person.Note: The maximum daily UV index, 5 in September, converts into the following recommendations:
Exercise prevention - Warding off sunburn is urged. To protect against the Sun's most potent rays, avoid direct exposure around midday. During bright days, sunglasses that offer UVA and UVB defense are recommended.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Riverview in September?
What is the most humid month?
What is the average humidity in September?
How much does it rain in September?
When it does not snow?
What is the average length of the day in September?
When are sunrise and sunset in September?
How long on average sun shines in September?
How high is the UV index in September in Riverview?
Average temperature in September
Riverview, DE
- Average high temperature in September: 76.5°F
The warmest month (with the highest average high temperature) is July (84.2°F).
The month with the lowest average high temperature is January (40.3°F).
- Average low temperature in September: 63.1°F
The month with the highest average low temperature is July (69.8°F).
The coldest month (with the lowest average low temperature) is January (28.8°F).
Average pressure in September
Riverview, DE
- Average pressure in September: 30.04"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
Riverview, DE
- Average wind speed in September: 7.3mph
The windiest month (with the highest average wind speed) is February (10.1mph).
The calmest month (with the lowest average wind speed) is August (6.3mph).
Average humidity in September
Riverview, DE
- Average humidity in September: 79%
The months with the highest relative humidity are May, August and September (79%).
The months with the lowest relative humidity are January, March, April and November (74%).
Average rainfall in September
Riverview, DE
- Average rainfall in September: 2.44"
The wettest month (with the highest rainfall) is August (3.9").
The driest month (with the least rainfall) is January (2.13").
Average rainfall days in September
Riverview, DE
- Average rainfall days in September: 13.6 days
The month with the highest number of rainy days is July (18.8 days).
The month with the least rainy days is November (9 days).
Average snowfall in September
Riverview, DE
- Average snowfall in September: 0"
The month with the highest snowfall is January (1.93").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Riverview, DE
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (4.3 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Riverview, DE
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in September: 9h and 1min
The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is February (Average sunshine: 4h and 54min).
Average sunshine days in September
Riverview, DE
- Average sunshine days in September: 13.9 days
The month with the most sunshine days is November (19.4 days).
The month with the least sunshine days is July (9.7 days).
Average UV index in September
Riverview, DE
- 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 and December (UV index 2).
Average cloud cover in September
Riverview, DE
- Average cloud cover in September: 34
The month with the most cloud cover is March (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 30).
Average visibility in September
Riverview, DE
- 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).
Riverview, Delaware, USA
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