September weather forecast and climate
Clearwater, WA

Weather in September

The first month of the autumn, September, is also an enjoyable month in Clearwater, Washington, with average temperature ranging between max 63.1°F (17.3°C) and min 51.8°F (11°C).

Temperature

In September, the average high-temperature is essentially the same as in August - a still comfortable 63.1°F (17.3°C). The average low-temperature, in Clearwater, Washington, is 51.8°F (11°C).

Humidity

In September, the average relative humidity is 81%.

Rainfall

In Clearwater, it is raining for 11.3 days, with typically 1.73" (44mm) of accumulated precipitation. Throughout the year, in Clearwater, there are 169.3 rainfall days, and 37.83" (961mm) of precipitation is accumulated.

Snowfall

In Clearwater snow does not fall in April through November.

Daylight

In Clearwater, Washington, the average length of the day is 12.5h.

Sunshine

In September, the average sunshine is 8.7h.

UV index

May through September, with an average maximum UV index of 4, are months with the highest UV index. A UV Index reading of 3 to 5 represents a medium health hazard from the exposure to the Sun's UV rays for average 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 solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
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FAQ

What is the average humidity in September in Clearwater?

In September, the average relative humidity in Clearwater, Washington, is 81%.

How much does it rain in Clearwater in September?

In September, the rain falls for 11.3 days. Throughout September, 1.73" (44mm) of precipitation is accumulated.

When it does not snow in Clearwater?

In Clearwater, Washington, snow does not fall in April through November.

What is the average length of the day in September in Clearwater?

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

How many hours of sunshine does Clearwater have in September?

In September, the average sunshine in Clearwater, Washington, is 8.7h.

What are the months with the highest UV index in Clearwater?

May through September, with an average maximum UV index of 4, are months with the highest UV index in Clearwater, Washington.

What is the UV index intensity in September in Clearwater?

In September, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a moderate vulnerability from unsafe exposure to the Sun's UV rays.

Average temperature in September
Clearwater, WA

Average temperature in September - Clearwater, WA
  • Average high temperature in September: 63.1°F

The warmest month (with the highest average high temperature) is August (65.8°F).
The month with the lowest average high temperature is December (45.1°F).

  • Average low temperature in September: 51.8°F

The month with the highest average low temperature is August (52.5°F).
The coldest month (with the lowest average low temperature) is February (38.7°F).

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Average pressure in September
Clearwater, WA

Average pressure in September - Clearwater, WA
  • Average pressure in September: 30.02"

The month with the highest atmospheric pressure is July (30.08").
The month with the lowest atmospheric pressure is March (29.99").

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Average wind speed in September
Clearwater, WA

Average wind speed in September - Clearwater, WA
  • Average wind speed in September: 6.1mph

The windiest month (with the highest average wind speed) is January (9.4mph).
The calmest month (with the lowest average wind speed) is August (5.7mph).

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Average humidity in September
Clearwater, WA

Average humidity in September - Clearwater, WA
  • Average humidity in September: 81%

Months with the highest relative humidity are January, November and December (84%).
The month with the lowest relative humidity is May (80%).

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Average rainfall in September
Clearwater, WA

Average rainfall in September - Clearwater, WA
  • Average rainfall in September: 1.73"

The wettest month (with the highest rainfall) is January (6.89").
The driest month (with the least rainfall) is July (0.51").

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Average rainfall days in September
Clearwater, WA

Average rainfall days in September - Clearwater, WA
  • Average rainfall days in September: 11.3 days

The month with the highest number of rainy days is November (19.4 days).
The month with the least rainy days is August (6.8 days).

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Average snowfall in September
Clearwater, WA

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

The month with the highest snowfall is February (0.59").
Months with the least snowfall are April, May, June, July, August, September, October and November (0").

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Average snowfall days in September
Clearwater, WA

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

The month with the highest number of snowfall days is February (1.5 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
Clearwater, WA

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

The month with the longest days is June (Average daylight: 15.9h).
The month with the shortest days is December (Average daylight: 8.5h).

  • Average sunshine in September: 8.7h

Months with the most sunshine are July and August (Average sunshine: 10.1h).
The month with the least sunshine is January (Average sunshine: 3.6h).

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Average sunshine days in September
Clearwater, WA

Average sunshine days in September - Clearwater, WA
  • Average sunshine days in September: 16.5 days

The month with the most sunshine days is August (21.4 days).
The month with the least sunshine days is November (9.4 days).

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Average UV index in September
Clearwater, WA

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

Months with the highest UV index are May, June, July, August and September (UV index 4).
Months with the lowest UV index are January, February, November and December (UV index 2).

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Average cloud cover in September
Clearwater, WA

Average cloud cover in September - Clearwater, WA
  • Average cloud cover in September: 36

The month with the most cloud cover is January (Cloud cover 61).
The month with the least cloud cover is August (Cloud cover 31).

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Average visibility in September
Clearwater, WA

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

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

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