September weather forecast
Brewster, WA

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Weather in September

The first month of the autumn, September, is still a pleasant month in Brewster, Washington, with an average temperature varying between 71.2°F (21.8°C) and 49.5°F (9.7°C).

Temperature

The move into September indicates a reduction in the average high-temperature, down from August's moderately hot 83.1°F (28.4°C) to a pleasant 71.2°F (21.8°C). Compared to daytime temperatures, Brewster's temperature drops significantly, averaging a chilly 49.5°F (9.7°C) during the nights of September.

Humidity

In Brewster, the average relative humidity in September is 49%.

Rainfall

In Brewster, in September, it is raining for 6.2 days, with typically 0.55" (14mm) of accumulated precipitation. In Brewster, during the entire year, the rain falls for 101.3 days and collects up to 9.45" (240mm) of precipitation.

Snowfall

April through October are months without snowfall in Brewster.

Daylight

In September, the average length of the day is 12h and 33min.
On the first day of September, sunrise is at 6:18 am and sunset at 7:39 pm. On the last day of the month, sunrise is at 6:58 am and sunset at 6:39 pm PDT.

Sunshine

In September, the average sunshine is 10.8h.

UV index

The average daily maximum UV index in September in Brewster is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for average individuals.
Note: A maximum daily UV index of 4 during September morphs into the following directions:
Adopt protective measures - Requirement to safeguard skin and eyes from harm exists. The Sun's radiation is especially intense around midday; try to stay in shade during this period. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration.
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Frequently asked questions

What are September temperatures in Brewster?

In Brewster, in September, the average high-temperature is 71.2°F (21.8°C), and the average low-temperature is 49.5°F (9.7°C). In August, the average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which combines relative humidity and air temperature, is computed to be 82.4°F (28°C).

What is the average humidity in September in Brewster?

In Brewster, Washington, the average relative humidity in September is 49%.

How many days does it rain in September in Brewster?

In September, in Brewster, the rain falls for 6.2 days. Throughout September, 0.55" (14mm) of precipitation is accumulated.

When it does not snow in Brewster?

In Brewster, Washington, snow does not fall in April through October.

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

The average day length in September is 12h and 33min.

When is the sunrise / sunset in September in Brewster?

On the first day of September in Brewster, sunrise is at 6:18 am and sunset at 7:39 pm. On the last day of the month, sunrise is at 6:58 am and sunset at 6:39 pm PDT.

How many hours of sunshine does Brewster have in September?

In September, the average sunshine duration in Brewster is 10.8h.

How high is the UV index in September in Brewster?

The average daily maximum UV index in September in Brewster, Washington, is 4. A UV Index estimate of 3 to 5 represents a moderate health threat 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
Brewster, WA

Average temperature in September - Brewster, WA
  • Average high temperature in September: 71.2°F

The warmest months (with the highest average high temperature) are July and August (83.1°F).
The months with the lowest average high temperature are January and December (30.7°F).

  • Average low temperature in September: 49.5°F

The month with the highest average low temperature is August (57°F).
The coldest month (with the lowest average low temperature) is December (18.9°F).

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Average pressure in September
Brewster, WA

Average pressure in September - Brewster, WA
  • Average pressure in September: 29.97"Hg

The month with the highest atmospheric pressure is January (30.17"Hg).
The months with the lowest atmospheric pressure are June and August (29.93"Hg).

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Average wind speed in September
Brewster, WA

Average wind speed in September - Brewster, WA
  • Average wind speed in September: 4.8mph

The windiest months (with the highest average wind speed) are April, June and July (5.3mph).
The calmest month (with the lowest average wind speed) is January (3.5mph).

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Average humidity in September
Brewster, WA

Average humidity in September - Brewster, WA
  • Average humidity in September: 49%

The month with the highest relative humidity is January (90%).
The month with the lowest relative humidity is August (40%).

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Average rainfall in September
Brewster, WA

Average rainfall in September - Brewster, WA
  • Average rainfall in September: 0.55"

The wettest month (with the highest rainfall) is December (1.34").
The driest month (with the least rainfall) is July (0.16").

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Average rainfall days in September
Brewster, WA

Average rainfall days in September - Brewster, WA
  • Average rainfall days in September: 6.2 days

The month with the highest number of rainy days is March (12.8 days).
The month with the least rainy days is August (2.8 days).

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Average snowfall in September
Brewster, WA

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

The month with the highest snowfall is December (4.72").
The months with the least snowfall are April, May, June, July, August, September and October (0").

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Average snowfall days in September
Brewster, WA

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

The month with the highest number of snowfall days is December (9.7 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
Brewster, WA

Average daylight in September / Average sunshine in September - Brewster, 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 24min).

  • Average sunshine in September: 10h and 5min

The months with the most sunshine are July and August (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 4h and 12min).

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Average sunshine days in September
Brewster, WA

Average sunshine days in September - Brewster, WA
  • Average sunshine days in September: 22.5 days

The month with the most sunshine days is August (26.3 days).
The month with the least sunshine days is February (13.7 days).

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Average UV index in September
Brewster, WA

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

The month with the highest UV index is July (UV index 7).
The month with the lowest UV index is November (UV index 1).

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Average cloud cover in September
Brewster, WA

Average cloud cover in September - Brewster, WA
  • Average cloud cover in September: 18

The month with the most cloud cover is January (Cloud cover 53).
The months with the least cloud cover are July and August (Cloud cover 12).

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Average visibility in September
Brewster, WA

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

The months with the highest visibility are April, May, June, July, August, September and October (6mi).
The months with the lowest visibility are January, February and December (4mi).

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Brewster, Washington, USA

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