September weather forecast and climate
Riverview, DE

Weather in September

The first month of the autumn, September, is also a moderately hot month in Riverview, Delaware, with average temperature varying between 76.5°F (24.7°C) and 63.1°F (17.3°C).

Temperature

In Riverview, the average high-temperature in September marginally drops, from 82.2°F (27.9°C) in August, to a still moderately hot 76.5°F (24.7°C). In Riverview, the average low-temperature is 63.1°F (17.3°C).

Humidity

May, August and September, with an average relative humidity of 79%, are most humid months.

Rainfall

In Riverview, it is raining for 13.6 days, with typically 2.44" (62mm) of accumulated precipitation. Throughout the year, in Riverview, there are 167.5 rainfall days, and 35.35" (898mm) of precipitation is accumulated.

Snowfall

In Riverview, Delaware, snow does not fall in May through October.

Daylight

In Riverview, the average length of the day in September is 12.4h.

Sunshine

In September, the average sunshine is 9.2h.

UV index

In Riverview, the average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a moderate health risk from the exposure to the Sun's UV radiation for ordinary individuals.
Note: In September, the average maximum UV index of 5 translate into the following recommendations:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the temperature in September in Riverview?

In September, the average high-temperature is 76.5°F (24.7°C), and the average low-temperature is 63.1°F (17.3°C).

What is the most humid month in Riverview?

Months with the highest humidity in Riverview are May, August and September, with an average relative humidity of 79%.

What is the average humidity in September in Riverview?

In September, the average relative humidity in Riverview is 79%.

How much does it rain in Riverview in September?

In Riverview, during September, the rain falls for 13.6 days and regularly aggregates up to 2.44" (62mm) of precipitation.

When it does not snow in Riverview?

May through October are months without snowfall.

How many hours of daylight does Riverview have in September?

In Riverview, Delaware, the average length of the day in September is 12.4h.

How many hours of sunshine does Riverview have in September?

In Riverview, the average sunshine in September is 9.2h.

How high is the UV index in September in Riverview?

In Riverview, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a medium health risk from the exposure to the Sun's UV radiation.

Average temperature in September
Riverview, DE

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).

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Average pressure in September
Riverview, DE

Average pressure in September - Riverview, DE
  • Average pressure in September: 30.04"

The month with the highest atmospheric pressure is November (30.12").
The month with the lowest atmospheric pressure is June (29.94").

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Average wind speed in September
Riverview, DE

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).

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Average humidity in September
Riverview, DE

Average humidity in September - Riverview, DE
  • Average humidity in September: 79%

Months with the highest relative humidity are May, August and September (79%).
Months with the lowest relative humidity are January, March, April and November (74%).

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Average rainfall in September
Riverview, DE

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").

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Average rainfall days in September
Riverview, DE

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).

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Average snowfall in September
Riverview, DE

Average snowfall in September - Riverview, DE
  • Average snowfall in September: 0"

The month with the highest snowfall is January (1.93").
Months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in September
Riverview, DE

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).
Months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average daylight in September /
Average sunshine in September
Riverview, DE

Average daylight in September / Average sunshine in September - Riverview, DE
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.9h).
The month with the shortest days is December (Average daylight: 9.5h).

  • Average sunshine in September: 9.2h

The month with the most sunshine is July (Average sunshine: 10.6h).
The month with the least sunshine is February (Average sunshine: 4.9h).

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Average sunshine days in September
Riverview, DE

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).

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Average UV index in September
Riverview, DE

Average UV index in September - Riverview, DE
  • Average UV index in September: 5

Months with the highest UV index are May, June, July and August (UV index 6).
Months with the lowest UV index are January and December (UV index 2).

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Average cloud cover in September
Riverview, DE

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).

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Average visibility in September
Riverview, DE

Average visibility in September - Riverview, DE
  • Average visibility in September: 6mi

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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