September weather forecast
Wheaton, MD

Share

Weather in September

The first month of the autumn, September, is still a warm month in Wheaton, Maryland, with an average temperature ranging between min 60.8°F (16°C) and max 78.1°F (25.6°C).

Temperature

With the arrival of September, Wheaton notices a mild change in the average high-temperature, sliding from August's 84.9°F (29.4°C) to a still moderately hot 78.1°F (25.6°C). An average low-temperature of 60.8°F (16°C) marks the month of September.

Humidity

In Wheaton, the average relative humidity in September is 74%.

Rainfall

In Wheaton, Maryland, in September, it is raining for 12.5 days, with typically 2.24" (57mm) of accumulated precipitation. In Wheaton, Maryland, during the entire year, the rain falls for 160.9 days and collects up to 32.99" (838mm) of precipitation.

Snowfall

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

Daylight

In September, the average length of the day in Wheaton is 12h and 26min.
On the first day of the month, sunrise is at 6:37 am and sunset at 7:38 pm. On the last day of September, sunrise is at 7:03 am and sunset at 6:52 pm EDT.

Sunshine

The average sunshine in September is 8.9h.

UV index

The average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a moderate threat to health from unsafe exposure to UV radiation for average individuals.
Note: In September, the maximum UV index of 5 suggests this advice:
Ensure safety - Recommendations to avert sunburn are presented. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. During bright days, sunglasses that offer UVA and UVB defense are recommended.
Updated: Aug 18, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the average September temperature?

During September, Wheaton experiences an average high-temperature of 78.1°F (25.6°C) and a low-temperature of 60.8°F (16°C). The average heat index (a.k.a. 'apparent temperature', 'real feel'), which calculates the temperature value influenced by the moisture in the air, in August is calculated to be 93.2°F (34°C).

What is the average humidity in September?

The average relative humidity in September is 74%.

How many days does it rain in September?

In Wheaton, in September, during 12.5 rainfall days, 2.24" (57mm) of precipitation is typically accumulated.

When it does not snow?

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

How many hours of daylight does Wheaton have in September?

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

When are sunrise and sunset in September?

On the first day of September, sunrise is at 6:37 am and sunset at 7:38 pm. On the last day of the month, sunrise is at 7:03 am and sunset at 6:52 pm EDT.

How long on average sun shines in September?

The average sunshine duration in September is 8.9h.

What is the UV index intensity in September in Wheaton?

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

Average temperature in September - Wheaton, MD
  • Average high temperature in September: 78.1°F

The warmest month (with the highest average high temperature) is July (87.3°F).
The month with the lowest average high temperature is January (39°F).

  • Average low temperature in September: 60.8°F

The month with the highest average low temperature is July (68.7°F).
The coldest month (with the lowest average low temperature) is January (26.2°F).

Average pressure in September
Wheaton, MD

Average pressure in September - Wheaton, MD
  • Average pressure in September: 30.05"Hg

The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).

Average wind speed in September
Wheaton, MD

Average wind speed in September - Wheaton, MD
  • Average wind speed in September: 5.7mph

The windiest month (with the highest average wind speed) is March (8.1mph).
The calmest month (with the lowest average wind speed) is August (5.1mph).

Average humidity in September
Wheaton, MD

Average humidity in September - Wheaton, MD
  • Average humidity in September: 74%

The months with the highest relative humidity are May, October and December (76%).
The month with the lowest relative humidity is July (70%).

Average rainfall in September
Wheaton, MD

Average rainfall in September - Wheaton, MD
  • Average rainfall in September: 2.24"

The wettest month (with the highest rainfall) is August (4.13").
The driest month (with the least rainfall) is January (2.17").

Average rainfall days in September
Wheaton, MD

Average rainfall days in September - Wheaton, MD
  • Average rainfall days in September: 12.5 days

The month with the highest number of rainy days is May (17.8 days).
The month with the least rainy days is November (8.8 days).

Average snowfall in September
Wheaton, MD

Average snowfall in September - Wheaton, MD
  • Average snowfall in September: 0"

The months with the highest snowfall are January and March (3.03").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in September
Wheaton, MD

Average snowfall days in September - Wheaton, MD
  • Average snowfall days in September: 0 days

The months with the highest number of snowfall days are January and February (5.1 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
Wheaton, MD

Average daylight in September / Average sunshine in September - Wheaton, MD
  • 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: 8h and 5min

The month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is February (Average sunshine: 5h and 0min).

Average sunshine days in September
Wheaton, MD

Average sunshine days in September - Wheaton, MD
  • Average sunshine days in September: 15.6 days

The month with the most sunshine days is November (19.4 days).
The months with the least sunshine days are May and July (11 days).

Average UV index in September
Wheaton, MD

Average UV index in September - Wheaton, MD
  • 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, November and December (UV index 2).

Average cloud cover in September
Wheaton, MD

Average cloud cover in September - Wheaton, MD
  • Average cloud cover in September: 37

The month with the most cloud cover is March (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 31).

Average visibility in September
Wheaton, MD

Average visibility in September - Wheaton, MD
  • Average visibility in September: 6mi

The months with the highest visibility are January, February, March, April, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is May (5mi).

Wheaton, Maryland, USA

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location