September weather forecast
Spokane, WA

Rocks and cliffs around the scenic Spokane Falls in Washington, leading to the vast Spokane River and a view of the high bridge out front
Rocks and cliffs around the scenic Spokane Falls in Washington, leading to the vast Spokane River and a view of the high bridge out front

Weather in September

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

Temperature

In September, the average high-temperature drops from a moderately hot 83.7°F (28.7°C) in August to a pleasant 72.9°F (22.7°C). In September, the average low-temperature is 50.7°F (10.4°C).

Humidity

The average relative humidity in September in Spokane is 48%.

Rainfall

In Spokane, during September, the rain falls for 7.5 days and regularly aggregates up to 0.63" (16mm) of precipitation. Throughout the year, in Spokane, 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 in Spokane. Throughout September, in the average 0.2 snowfall days, it receives 0.47" (12mm) of snow. In Spokane, 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 in Spokane is 12h and 33min.
On the first day of the month, sunrise is at 6:08 am and sunset at 7:30 pm. On the last day of September, sunrise is at 6:47 am and sunset at 6:31 pm PDT.

Sunshine

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

UV index

In Spokane, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for ordinary individuals.
Note: In September, the average maximum UV index of 4 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. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the temperature in September in Spokane?

In September, in Spokane, the average high-temperature is 72.9°F (22.7°C), and the average low-temperature is 50.7°F (10.4°C). The average heat index (a.k.a. 'real feel', 'feels like'), which combines relative humidity and air temperature, in July is calculated to be 82.4°F (28°C).

What is the average humidity in September in Spokane?

The average relative humidity in September is 48%.

How many days does it rain in September in Spokane?

In Spokane, Washington, in September, it is raining for 7.5 days, with typically 0.63" (16mm) of accumulated precipitation.

When does it start snowing in Spokane?

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

How many hours of daylight does Spokane have in September?

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

When are sunrise and sunset in September in Spokane?

In September, on the first day of the month, sunrise is at 6:08 am and sunset at 7:30 pm. On the last day of the month, in Spokane, sunrise is at 6:47 am and sunset at 6:31 pm PDT.

How many hours of sunshine does Spokane have in September?

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

How high is the UV index in September in Spokane?

In September, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a moderate health threat from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Spokane, WA

Average temperature in September - Spokane, 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).

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Average pressure in September
Spokane, WA

Average pressure in September - Spokane, 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).

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Average wind speed in September
Spokane, WA

Average wind speed in September - Spokane, 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).

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Average humidity in September
Spokane, WA

Average humidity in September - Spokane, 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%).

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Average rainfall in September
Spokane, WA

Average rainfall in September - Spokane, 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").

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Average rainfall days in September
Spokane, WA

Average rainfall days in September - Spokane, 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).

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Average snowfall in September
Spokane, WA

Average snowfall in September - Spokane, 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").

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Average snowfall days in September
Spokane, WA

Average snowfall days in September - Spokane, 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).

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

Average daylight in September / Average sunshine in September - Spokane, WA
  • Average daylight in September: 12h and 33min

The month with the longest days is June (Average daylight: 15h and 56min).
The month with the shortest days is December (Average daylight: 8h and 30min).

  • Average sunshine in September: 10h and 12min

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).

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Average sunshine days in September
Spokane, WA

Average sunshine days in September - Spokane, 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).

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Average UV index in September
Spokane, WA

Average UV index in September - Spokane, 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).

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Average cloud cover in September
Spokane, WA

Average cloud cover in September - Spokane, 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).

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Average visibility in September
Spokane, WA

Average visibility in September - Spokane, 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).

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