September weather forecast
Forks, WA

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Large rocks near a tall cliff in the section of the iconic Second Beach in Forks, Washington
Large rocks near a tall cliff in the section of the iconic Second Beach in Forks, Washington

Weather in September

September offers a gentle transition towards autumn while maintaining an average high temperature of 64.2°F (17.9°C). Accompanied by calm winds and a steady daylight duration, the month promises comfortable warmth. The slight uptick in rainfall fosters a greener environment, acting as a prelude to the impending fall foliage. A scattering of clouds softens the sunlight, casting a dreamy sheen over Forks. Thus, September, with its harmonious weather conditions, sets the stage for the upcoming seasonal transition.

Temperature

Forks experiences an average high-temperature of an enjoyable 64.2°F (17.9°C) in September, subtly different from August's 68.2°F (20.1°C). September in Forks, Washington, generally records an average low-temperature of 49.3°F (9.6°C).

Humidity

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

Rainfall

In Forks, in September, it is raining for 7.4 days, with typically 0.43" (11mm) of accumulated precipitation. In Forks, Washington, during the entire year, the rain falls for 109.2 days and collects up to 10.79" (274mm) of precipitation.

Snowfall

April through December are months without snowfall.

Daylight

The average length of the day in September in Forks is 12h and 33min.
On the first day of the month, sunrise is at 6:36 am and sunset at 7:57 pm. On the last day of September, sunrise is at 7:16 am and sunset at 6:57 pm PDT.

Sunshine

In September, the average sunshine in Forks is 8.5h.

UV index

The average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for average individuals.
Note: The maximum daily UV index of 4 during September translates into the following directions:
Undertake precautions - Obligation exists to protect against skin and eye damage. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage.
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Frequently asked questions

What is the temperature in September in Forks?

In September, the average high-temperature and low-temperature in Forks, Washington, are 64.2°F (17.9°C) and 49.3°F (9.6°C) respectively.

What is the average humidity in September in Forks?

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

How many days does it rain in September in Forks?

In Forks, Washington, in September, during 7.4 rainfall days, 0.43" (11mm) of precipitation is typically accumulated.

When it does not snow in Forks?

April through December are months without snowfall in Forks.

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

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

When is the sunrise / sunset in September in Forks?

In September, on the first day of the month, sunrise is at 6:36 am and sunset at 7:57 pm. On the last day of the month, in Forks, sunrise is at 7:16 am and sunset at 6:57 pm PDT.

How long on average sun shines in September in Forks?

The average sunshine duration in September is 8.5h.

What is the UV index reading in September in Forks?

The average daily maximum UV index in September in Forks, Washington, is 4. A UV Index estimate of 3 to 5 represents a moderate vulnerability from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Forks, WA

Average temperature in September - Forks, WA
  • Average high temperature in September: 64.2°F

The warmest month (with the highest average high temperature) is August (68.2°F).
The month with the lowest average high temperature is December (44.2°F).

  • Average low temperature in September: 49.3°F

The month with the highest average low temperature is August (50.5°F).
The coldest month (with the lowest average low temperature) is February (37°F).

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Average pressure in September
Forks, WA

Average pressure in September - Forks, WA
  • Average pressure in September: 30.02"Hg

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

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Average wind speed in September
Forks, WA

Average wind speed in September - Forks, WA
  • Average wind speed in September: 5.1mph

The windiest month (with the highest average wind speed) is January (8mph).
The calmest month (with the lowest average wind speed) is August (4.5mph).

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Average humidity in September
Forks, WA

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

The months with the highest relative humidity are January and December (86%).
The months with the lowest relative humidity are May and July (80%).

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Average rainfall in September
Forks, WA

Average rainfall in September - Forks, WA
  • Average rainfall in September: 0.43"

The wettest month (with the highest rainfall) is January (2.36").
The driest month (with the least rainfall) is July (0.16").

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Average rainfall days in September
Forks, WA

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

The month with the highest number of rainy days is March (13.3 days).
The month with the least rainy days is August (3 days).

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Average snowfall in September
Forks, WA

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

The month with the highest snowfall is January (0.75").
The months with the least snowfall are April, May, June, July, August, September, October, November and December (0").

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Average snowfall days in September
Forks, WA

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

The month with the highest number of snowfall days is February (2.2 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
Forks, WA

Average daylight in September / Average sunshine in September - Forks, WA
  • Average daylight in September: 12h and 4min

The month with the longest days is June (Average daylight: 16h and 0min).
The month with the shortest days is December (Average daylight: 8h and 30min).

  • Average sunshine in September: 8h and 3min

The month with the most sunshine is August (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).

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Average sunshine days in September
Forks, WA

Average sunshine days in September - Forks, WA
  • Average sunshine days in September: 19 days

The month with the most sunshine days is August (24.9 days).
The month with the least sunshine days is February (12.2 days).

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Average UV index in September
Forks, WA

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

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

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Average cloud cover in September
Forks, WA

Average cloud cover in September - Forks, WA
  • Average cloud cover in September: 39

The month with the most cloud cover is January (Cloud cover 62).
The month with the least cloud cover is August (Cloud cover 34).

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Average visibility in September
Forks, WA

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

The months with the highest visibility are January, February, March, April, October, November and December (6mi).
The months with the lowest visibility are May, June, July, August and September (5mi).

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Forks, Washington, USA

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