September weather forecast
Vancouver, WA

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The intricate design of the road acting as a bridge over a calm, blue river in Vancouver, Washington
The intricate design of the road acting as a bridge over a calm, blue river in Vancouver, Washington

Weather in September

By the time September rolls around, subtle signs of the approaching fall start to creep into the weather. The days grow slightly shorter, while the explosion of heat lessens. People start to swap their summer clothing for the comfortable coziness of lightweight sweaters. The average temperature sees a comfortable dip, alongside a slight increase in rainfall which totals an average of 1.73" (44mm), indicating the transitional nature of the month.

Temperature

Vancouver's weather subtly changes with the onset of September, barely falling from a warm 80.6°F (27°C) in August to an agreeable 73°F (22.8°C). September witnesses a substantial contrast between the daytime highs and the average low of 50.7°F (10.4°C).

Humidity

In September, the average relative humidity in Vancouver is 70%.

Rainfall

In September, the rain falls for 10.8 days. Throughout September, 1.73" (44mm) of precipitation is accumulated. Throughout the year, in Vancouver, there are 177.1 rainfall days, and 34.29" (871mm) of precipitation is accumulated.

Snowfall

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

Daylight

In Vancouver, the average length of the day in September is 12h and 31min.
On the first day of September in Vancouver, sunrise is at 6:32 am and sunset at 7:47 pm. On the last day of the month, sunrise is at 7:08 am and sunset at 6:51 pm PDT.

Sunshine

The average sunshine in September in Vancouver is 9.3h.

UV index

In September, the average daily maximum UV index in Vancouver, Washington, is 4. A UV Index value of 3 to 5 symbolizes a moderate health risk from unprotected exposure to Sun's UV rays for average individuals.
Note: A maximum high UV index of 4 in September translates into the following recommendations:
Exercise prudence. Persons with fair skin could be burned in under 30 minutes. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. Opt for tightly woven and loose clothing to enhance protection from the Sun.
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Frequently asked questions

What is the temperature in September in Vancouver?

During September, Vancouver experiences an average high-temperature of 73°F (22.8°C) and a low-temperature of 50.7°F (10.4°C). The average heat index (a.k.a. 'feels like', 'apparent temperature'), which represents the influence of relative humidity on air temperature, in August is evaluated at 82.4°F (28°C).

What is the average humidity in September in Vancouver?

The average relative humidity in September in Vancouver is 70%.

How much does it rain in Vancouver in September?

In Vancouver, Washington, in September, during 10.8 rainfall days, 1.73" (44mm) of precipitation is typically accumulated.

When it does not snow in Vancouver?

In Vancouver, snow does not fall in April through October.

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

In September, the average day length in Vancouver is 12h and 31min.

What time are sunrise and sunset in September in Vancouver?

On the first day of September, sunrise is at 6:32 am and sunset at 7:47 pm. On the last day of the month, sunrise is at 7:08 am and sunset at 6:51 pm PDT.

How many hours of sunshine does Vancouver have in September?

In September, the average sunshine duration is 9.3h.

What is the UV index reading in September in Vancouver?

The average daily maximum UV index in September in Vancouver is 4. A UV Index estimate of 3 to 5 represents a moderate vulnerability from unsafe 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
Vancouver, WA

Average temperature in September - Vancouver, WA
  • Average high temperature in September: 73°F

The warmest month (with the highest average high temperature) is August (80.6°F).
The month with the lowest average high temperature is December (43.7°F).

  • Average low temperature in September: 50.7°F

The month with the highest average low temperature is August (54°F).
The coldest month (with the lowest average low temperature) is December (34°F).

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Average pressure in September
Vancouver, WA

Average pressure in September - Vancouver, WA
  • Average pressure in September: 30.01"Hg

The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is August (30"Hg).

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Average wind speed in September
Vancouver, WA

Average wind speed in September - Vancouver, WA
  • Average wind speed in September: 3.9mph

The windiest month (with the highest average wind speed) is January (5.5mph).
The calmest month (with the lowest average wind speed) is August (3.8mph).

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Average humidity in September
Vancouver, WA

Average humidity in September - Vancouver, WA
  • Average humidity in September: 70%

The months with the highest relative humidity are January and February (84%).
The month with the lowest relative humidity is August (65%).

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Average rainfall in September
Vancouver, WA

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

The wettest month (with the highest rainfall) is December (5.08").
The driest month (with the least rainfall) is July (0.35").

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Average rainfall days in September
Vancouver, WA

Average rainfall days in September - Vancouver, WA
  • Average rainfall days in September: 10.8 days

The month with the highest number of rainy days is March (20.6 days).
The month with the least rainy days is August (4.9 days).

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Average snowfall in September
Vancouver, WA

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

The month with the highest snowfall is February (1.42").
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
Vancouver, WA

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

The month with the highest number of snowfall days is February (2.1 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).

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

Average daylight in September / Average sunshine in September - Vancouver, WA
  • Average daylight in September: 12h and 3min

The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).

  • Average sunshine in September: 9h and 2min

The month with the most sunshine is August (Average sunshine: 11h and 0min).
The months with the least sunshine are January and February (Average sunshine: 4h and 6min).

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Average sunshine days in September
Vancouver, WA

Average sunshine days in September - Vancouver, WA
  • Average sunshine days in September: 17.7 days

The month with the most sunshine days is July (24.1 days).
The month with the least sunshine days is February (7.9 days).

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Average UV index in September
Vancouver, WA

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

The month with the highest UV index is July (UV index 6).
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
Vancouver, WA

Average cloud cover in September - Vancouver, WA
  • Average cloud cover in September: 33

The month with the most cloud cover is February (Cloud cover 58).
The month with the least cloud cover is August (Cloud cover 23).

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Average visibility in September
Vancouver, WA

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

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

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Vancouver, Washington, USA

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