September weather forecast
Marshall, WA

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Weather in September

The first month of the autumn, September, is still a pleasant month in Marshall, Washington, with an average temperature varying between 50.7°F (10.4°C) and 72.9°F (22.7°C).

Temperature

During the transition into September, Marshall observes a decrease in the average high-temperature, falling from a moderately hot 83.7°F (28.7°C) in August to a pleasant 72.9°F (22.7°C). Despite the hot September days, Marshall's nights see an average temperature plunge to a fresh 50.7°F (10.4°C).

Humidity

In September, the average relative humidity is 48%.

Rainfall

In Marshall, in September, during 7.5 rainfall days, 0.63" (16mm) of precipitation is typically accumulated. Throughout the year, there are 127.8 rainfall days, and 16.93" (430mm) of precipitation is accumulated.

Snowfall

January through May, September through December are months with snowfall. September is the first month it typically snows. Throughout September, in the average 0.2 snowfall days, it receives 0.47" (12mm) of snow. In Marshall, during the entire year, snow falls for 62.3 days and aggregates up to 37.83" (961mm) of snow.

Daylight

The average length of the day in September is 12h and 33min.
On the first day of September, sunrise is at 6:09 am and sunset at 7:29 pm. On the last day of the month, sunrise is at 6:48 am and sunset at 6:30 pm PDT.

Sunshine

In Marshall, the average sunshine in September is 10.2h.

UV index

The average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for ordinary individuals.
Note: A typical high UV index of 4 in September suggests the following recommendations:
Undertake precautions - Obligation exists to protect against skin and eye damage. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage. Be alert! Nearly double the UV rays from the Sun can be reflected by snow.

Frequently asked questions

What are September temperatures?

The average high-temperature and low-temperature during September are 72.9°F (22.7°C) and 50.7°F (10.4°C) respectively. The average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which combines air temperature and relative humidity, in July is computed to be 82.4°F (28°C).

What is the average humidity in September?

The average relative humidity in September is 48%.

How many days does it rain in September?

In Marshall, in September, during 7.5 rainfall days, 0.63" (16mm) of precipitation is typically accumulated.

When does it start snowing?

September is the first month it typically snows. Throughout September, in the average 0.2 snowfall days, it receives 0.47" (12mm) of snow.

What is the average length of the day in September?

In September, the average day length is 12h and 33min.

When is the sunrise / sunset in September?

On the first day of September, sunrise is at 6:09 am and sunset at 7:29 pm. On the last day of the month, sunrise is at 6:48 am and sunset at 6:30 pm PDT.

How many hours of sunshine does Marshall have in September?

In Marshall, the average sunshine duration in September is 10.2h.

What is the UV index intensity in September?

In September, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a moderate vulnerability from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Marshall, WA

Average temperature in September - Marshall, WA
  • Average high temperature in September: 72.9°F

The warmest months (with the highest average high temperature) are July and August (83.7°F).
The month with the lowest average high temperature is December (32.2°F).

  • Average low temperature in September: 50.7°F

The month with the highest average low temperature is August (59°F).
The coldest month (with the lowest average low temperature) is December (22.1°F).

Average pressure in September
Marshall, WA

Average pressure in September - Marshall, WA
  • Average pressure in September: 29.96"Hg

The month with the highest atmospheric pressure is January (30.19"Hg).
The month with the lowest atmospheric pressure is August (29.9"Hg).

Average wind speed in September
Marshall, WA

Average wind speed in September - Marshall, WA
  • Average wind speed in September: 5.9mph

The windiest month (with the highest average wind speed) is April (7.3mph).
The calmest month (with the lowest average wind speed) is August (5.7mph).

Average humidity in September
Marshall, WA

Average humidity in September - Marshall, WA
  • Average humidity in September: 48%

The month with the highest relative humidity is January (89%).
The month with the lowest relative humidity is August (38%).

Average rainfall in September
Marshall, WA

Average rainfall in September - Marshall, WA
  • Average rainfall in September: 0.63"

The wettest month (with the highest rainfall) is March (2.13").
The driest month (with the least rainfall) is August (0.35").

Average rainfall days in September
Marshall, WA

Average rainfall days in September - Marshall, WA
  • Average rainfall days in September: 7.5 days

The month with the highest number of rainy days is April (16.3 days).
The month with the least rainy days is July (4.9 days).

Average snowfall in September
Marshall, WA

Average snowfall in September - Marshall, WA
  • Average snowfall in September: 0.47"

The month with the highest snowfall is January (10.39").
The months with the least snowfall are June, July and August (0").

Average snowfall days in September
Marshall, WA

Average snowfall days in September - Marshall, WA
  • Average snowfall days in September: 0.2 days

The month with the highest number of snowfall days is December (15.6 days).
The months with the least snowfall days are June, July and August (0 days).

Average daylight in September /
Average sunshine in September
Marshall, WA

Average daylight in September / Average sunshine in September - Marshall, WA
  • Average daylight in September: 12h and 3min

The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 30min).

  • Average sunshine in September: 10h and 1min

The month with the most sunshine is August (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 3h and 54min).

Average sunshine days in September
Marshall, WA

Average sunshine days in September - Marshall, WA
  • Average sunshine days in September: 20.3 days

The month with the most sunshine days is July (24.1 days).
The month with the least sunshine days is March (9.8 days).

Average UV index in September
Marshall, WA

Average UV index in September - Marshall, WA
  • Average UV index in September: 4

The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are February and December (UV index 1).

Average cloud cover in September
Marshall, WA

Average cloud cover in September - Marshall, WA
  • Average cloud cover in September: 20

The months with the most cloud cover are January and December (Cloud cover 59).
The months with the least cloud cover are July and August (Cloud cover 13).

Average visibility in September
Marshall, WA

Average visibility in September - Marshall, WA
  • Average visibility in September: 6mi

The months with the highest visibility are March, April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January and December (4mi).

Marshall, Washington, USA

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