September weather forecast
Elk Plain, WA

Weather in September

The first month of the autumn, September, is still a pleasant month in Elk Plain, Washington, with temperature in the range of an average low of 48°F (8.9°C) and an average high of 69.8°F (21°C).

Temperature

In Elk Plain, the average high-temperature in September marginally drops from a warm 77.2°F (25.1°C) in August to a pleasant 69.8°F (21°C). The average low-temperature, in Elk Plain, is 48°F (8.9°C).

Humidity

In September, the average relative humidity in Elk Plain, Washington, is 75%.

Rainfall

In Elk Plain, Washington, during September, the rain falls for 12.1 days and regularly aggregates up to 1.77" (45mm) of precipitation. Throughout the year, in Elk Plain, there are 172.9 rainfall days, and 32.28" (820mm) of precipitation is accumulated.

Snowfall

In Elk Plain, snow does not fall in May through October.

Daylight

In Elk Plain, the average length of the day in September is 12h and 32min.
On the first day of September in Elk Plain, sunrise is at 6:29 am and sunset at 7:49 pm. On the last day of the month, sunrise is at 7:07 am and sunset at 6:51 pm PDT.

Sunshine

In September, the average sunshine in Elk Plain is 9h.

UV index

In September, the average daily maximum UV index in Elk Plain is 3. A UV Index reading of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for the ordinary person.
Note: In September, the average maximum UV index of 3 translate into the following recommendations:
Take precautions - Protection against sun damage is advised. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the average humidity in September in Elk Plain?

In Elk Plain, Washington, the average relative humidity in September is 75%.

How much does it rain in Elk Plain in September?

In Elk Plain, in September, during 12.1 rainfall days, 1.77" (45mm) of precipitation is typically accumulated.

When it does not snow in Elk Plain?

May through October are months without snowfall in Elk Plain, Washington.

How many hours of daylight does Elk Plain have in September?

In Elk Plain, the average day length in September is 12h and 32min.

When are sunrise and sunset in September in Elk Plain?

On the first day of September in Elk Plain, sunrise is at 6:29 am and sunset at 7:49 pm. On the last day of the month, sunrise is at 7:07 am and sunset at 6:51 pm PDT.

How many hours of sunshine does Elk Plain have in September?

In September, the average sunshine duration in Elk Plain is 9h.

How high is the UV index in September in Elk Plain?

The average daily maximum UV index in September in Elk Plain is 3. 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
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Elk Plain, WA

Average temperature in September - Elk Plain, WA
  • Average high temperature in September: 69.8°F

The warmest month (with the highest average high temperature) is August (77.2°F).
The month with the lowest average high temperature is December (42.8°F).

  • Average low temperature in September: 48°F

The month with the highest average low temperature is August (51.3°F).
The coldest month (with the lowest average low temperature) is December (32.9°F).

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Average pressure in September
Elk Plain, WA

Average pressure in September - Elk Plain, WA
  • Average pressure in September: 30.01"Hg

The month with the highest atmospheric pressure is January (30.1"Hg).
The months with the lowest atmospheric pressure are March, August and September (30.01"Hg).

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Average wind speed in September
Elk Plain, WA

Average wind speed in September - Elk Plain, WA
  • Average wind speed in September: 3.9mph

The windiest months (with the highest average wind speed) are January and March (4.9mph).
The calmest month (with the lowest average wind speed) is August (3.7mph).

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Average humidity in September
Elk Plain, WA

Average humidity in September - Elk Plain, WA
  • Average humidity in September: 75%

The months with the highest relative humidity are January and December (87%).
The month with the lowest relative humidity is July (70%).

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Average rainfall in September
Elk Plain, WA

Average rainfall in September - Elk Plain, WA
  • Average rainfall in September: 1.77"

The wettest month (with the highest rainfall) is December (4.92").
The driest month (with the least rainfall) is July (0.43").

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Average rainfall days in September
Elk Plain, WA

Average rainfall days in September - Elk Plain, WA
  • Average rainfall days in September: 12.1 days

The month with the highest number of rainy days is March (20.2 days).
The month with the least rainy days is August (4.8 days).

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Average snowfall in September
Elk Plain, WA

Average snowfall in September - Elk Plain, WA
  • Average snowfall in September: 0"

The month with the highest snowfall is February (2.44").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in September
Elk Plain, WA

Average snowfall days in September - Elk Plain, WA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (4.1 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
Elk Plain, WA

Average daylight in September / Average sunshine in September - Elk Plain, WA
  • Average daylight in September: 12h and 32min

The month with the longest days is June (Average daylight: 15h and 50min).
The month with the shortest days is December (Average daylight: 8h and 35min).

  • Average sunshine in September: 9h and 0min

The month with the most sunshine is August (Average sunshine: 10h and 42min).
The month with the least sunshine is December (Average sunshine: 4h and 6min).

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Average sunshine days in September
Elk Plain, WA

Average sunshine days in September - Elk Plain, WA
  • Average sunshine days in September: 16.2 days

The month with the most sunshine days is August (23.8 days).
The month with the least sunshine days is November (9.3 days).

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Average UV index in September
Elk Plain, WA

Average UV index in September - Elk Plain, WA
  • Average UV index in September: 3

The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, October, November and December (UV index 2).

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Average cloud cover in September
Elk Plain, WA

Average cloud cover in September - Elk Plain, WA
  • Average cloud cover in September: 37

The month with the most cloud cover is December (Cloud cover 58).
The month with the least cloud cover is August (Cloud cover 27).

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Average visibility in September
Elk Plain, WA

Average visibility in September - Elk Plain, WA
  • Average visibility in September: 5mi

The months with the highest visibility are July and August (6mi).
The months with the lowest visibility are January and February (4mi).

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