September weather forecast
Riverview, DE

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Weather in September

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

Temperature

The onset of September results in a small decrease in the average high-temperature, moderately receding from a warm 82.2°F (27.9°C) in August to a still moderately hot 76.5°F (24.7°C). Throughout September, an average low-temperature of 63.1°F (17.3°C) is expected in Riverview.

Humidity

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

Rainfall

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

In Riverview, 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 Riverview, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for the ordinary person.
Note: The maximum daily UV index of 5 in September converts into the following recommendations:
Undertake protective steps - Obligation to safeguard skin and eyes from harm is in place. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense.
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Frequently asked questions

What is the average September temperature in Riverview?

During September, Riverview experiences an average high-temperature of 76.5°F (24.7°C) and a low-temperature of 63.1°F (17.3°C). In August, the average heat index (a.k.a. 'real feel', 'feels like'), which calculates the temperature value influenced by the moisture in the air, is computed to be 89.6°F (32°C).

What are the most humid months in Riverview?

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

What is the average humidity in September in Riverview?

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

How much does it rain in Riverview in September?

In Riverview, in September, it is raining for 13.6 days, with typically 2.44" (62mm) of accumulated precipitation.

When it does not snow in Riverview?

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

What is the average length of the day in September in Riverview?

The average day length in September in Riverview, Delaware, is 12h and 26min.

What time are sunrise and sunset in September in Riverview?

On the first day of September in Riverview, Delaware, 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.

How many hours of sunshine does Riverview have in September?

The average sunshine duration in September in Riverview, Delaware, is 9.2h.

How high is the UV index in September in Riverview?

The average daily maximum UV index in September in Riverview is 5. A UV Index of 3 to 5 symbolizes a medium health risk from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

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"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).

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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%

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%).

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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").
The 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).
The 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: 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).

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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

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).

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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

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).

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Riverview, Delaware, USA

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