September weather forecast
Monroe, WA

The red Washington Water Powerhouse, next to a large bridge over the Spokane River and scenic waterfalls in Monroe, Washington
The red Washington Water Powerhouse, next to a large bridge over the Spokane River and scenic waterfalls in Monroe, Washington

Weather in September

September, the first month of the autumn, in Monroe, is still a pleasant month, with average temperature ranging between max 68.7°F (20.4°C) and min 47.3°F (8.5°C).

Temperature

In September, the average high-temperature slightly decreases, from a warm 75.6°F (24.2°C) in August, to a pleasant 68.7°F (20.4°C). In September, the average low-temperature is 47.3°F (8.5°C).

Humidity

In Monroe, the average relative humidity in September is 76%.

Rainfall

In Monroe, during September, the rain falls for 7.4 days and regularly aggregates up to 0.71" (18mm) of precipitation. In Monroe, Washington, during the entire year, the rain falls for 115.8 days and collects up to 11.81" (300mm) of precipitation.

Snowfall

May through October are months without snowfall in Monroe.

Daylight

In Monroe, the average length of the day is 12.5h.

Sunshine

The average sunshine is 9h.

UV index

The average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a moderate health risk from unprotected 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. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the average humidity in September in Monroe?

In September, the average relative humidity is 76%.

How much does it rain in Monroe in September?

In September, the rain falls for 7.4 days. Throughout September, 0.71" (18mm) of precipitation is accumulated.

When it does not snow in Monroe?

May through October are months without snowfall in Monroe.

How many hours of daylight does Monroe have in September?

In Monroe, Washington, the average length of the day in September is 12.5h.

How many hours of sunshine does Monroe have in September?

The average sunshine in September is 9h.

What is the UV index intensity in September in Monroe?

In Monroe, Washington, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a medium health risk from the exposure to the Sun's UV radiation.

Average temperature in September
Monroe, WA

Average temperature in September - Monroe, WA
  • Average high temperature in September: 68.7°F

The warmest month (with the highest average high temperature) is August (75.6°F).
The month with the lowest average high temperature is December (41.2°F).

  • Average low temperature in September: 47.3°F

The month with the highest average low temperature is August (49.8°F).
The coldest month (with the lowest average low temperature) is December (31.8°F).

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Average pressure in September
Monroe, WA

Average pressure in September - Monroe, WA
  • Average pressure in September: 30.01"

The month with the highest atmospheric pressure is January (30.1").
The month with the lowest atmospheric pressure is August (30").

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Average wind speed in September
Monroe, WA

Average wind speed in September - Monroe, WA
  • Average wind speed in September: 3.5mph

The windiest month (with the highest average wind speed) is January (4.9mph).
The calmest month (with the lowest average wind speed) is August (3.3mph).

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Average humidity in September
Monroe, WA

Average humidity in September - Monroe, WA
  • Average humidity in September: 76%

Months with the highest relative humidity are January, February and December (86%).
The month with the lowest relative humidity is July (71%).

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Average rainfall in September
Monroe, WA

Average rainfall in September - Monroe, WA
  • Average rainfall in September: 0.71"

The wettest month (with the highest rainfall) is December (1.85").
The driest month (with the least rainfall) is August (0.2").

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Average rainfall days in September
Monroe, WA

Average rainfall days in September - Monroe, WA
  • Average rainfall days in September: 7.4 days

The month with the highest number of rainy days is March (13.6 days).
The month with the least rainy days is August (4 days).

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Average snowfall in September
Monroe, WA

Average snowfall in September - Monroe, WA
  • Average snowfall in September: 0"

The month with the highest snowfall is February (1.02").
Months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in September
Monroe, WA

Average snowfall days in September - Monroe, WA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (2.8 days).
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
Monroe, WA

Average daylight in September / Average sunshine in September - Monroe, WA
  • Average daylight in September: 12.5h

The month with the longest days is June (Average daylight: 16h).
The month with the shortest days is December (Average daylight: 8.5h).

  • Average sunshine in September: 9h

The month with the most sunshine is August (Average sunshine: 10.6h).
The month with the least sunshine is December (Average sunshine: 3.8h).

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Average sunshine days in September
Monroe, WA

Average sunshine days in September - Monroe, WA
  • Average sunshine days in September: 21.1 days

The month with the most sunshine days is August (25.5 days).
The month with the least sunshine days is April (15 days).

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Average UV index in September
Monroe, WA

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

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

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Average cloud cover in September
Monroe, WA

Average cloud cover in September - Monroe, WA
  • Average cloud cover in September: 38

The month with the most cloud cover is December (Cloud cover 60).
The month with the least cloud cover is August (Cloud cover 28).

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Average visibility in September
Monroe, WA

Average visibility in September - Monroe, WA
  • Average visibility in September: 5mi

The month with the highest visibility is July (6mi).
Months with the lowest visibility are January, February, March, April, November and December (4mi).

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