September weather forecast
College Place, WA

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Weather in September

The first month of the autumn, September, is still a warm month in College Place, Washington, with an average temperature ranging between min 53.6°F (12°C) and max 74.3°F (23.5°C).

Temperature

September's onset brings a reduction in the average high-temperature, from a moderately hot 84.6°F (29.2°C) in August to a still warm 74.3°F (23.5°C). In September, the temperature drops to an average of 53.6°F (12°C) at night.

Humidity

The average relative humidity in September in College Place is 47%.

Rainfall

In College Place, during September, the rain falls for 7.6 days and regularly aggregates up to 0.55" (14mm) of precipitation. Throughout the year, in College Place, there are 141.7 rainfall days, and 15.12" (384mm) of precipitation is accumulated.

Snowfall

January through April, September, November and December are months with snowfall. September is the first month it typically snows in College Place. Throughout September, in the average 0.1 snowfall days, it receives 0.08" (2mm) of snow. In College Place, during the entire year, snow falls for 21.1 days and aggregates up to 9.09" (231mm) of snow.

Daylight

In College Place, Washington, the average length of the day in September is 12h and 31min.
On the first day of September, sunrise is at 6:15 am and sunset at 7:31 pm. On the last day of the month, sunrise is at 6:51 am and sunset at 6:34 pm PDT.

Sunshine

The average sunshine in September in College Place is 10.5h.

UV index

In September, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV radiation for average individuals.
Note: In September, the maximum UV index of 4 transforms into these recommendations:
Preventative actions are necessary - The mandate to avoid skin and eye damage is in place. To guard against the harmful effects of the Sun, minimize exposure during midday. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation. Alert! The snow's reflection can amplify the UV radiation of the Sun nearly twice.
Updated: Feb 14, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the temperature in September in College Place?

In College Place, in September, the average high-temperature is 74.3°F (23.5°C), and the average low-temperature is 53.6°F (12°C). The average heat index (a.k.a. 'real feel', 'feels like'), which takes the relative humidity and factors it into the air temperature reading, in July is evaluated at 84.2°F (29°C).

What is the average humidity in September in College Place?

The average relative humidity in September is 47%.

How many days does it rain in September in College Place?

In College Place, Washington, in September, it is raining for 7.6 days, with typically 0.55" (14mm) of accumulated precipitation.

When does it start snowing in College Place?

September is the first month it typically snows in College Place, Washington. Throughout September, in the average 0.1 snowfall days, it receives 0.08" (2mm) of snow.

What is the average length of the day in September in College Place?

The average day length in September in College Place, Washington, is 12h and 31min.

When is the sunrise / sunset in September in College Place?

On the first day of September, sunrise is at 6:15 am and sunset at 7:31 pm. On the last day of the month, sunrise is at 6:51 am and sunset at 6:34 pm PDT.

How long on average sun shines in September in College Place?

In College Place, Washington, the average sunshine duration in September is 10.5h.

How high is the UV index in September in College Place?

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

Average temperature in September - College Place, WA
  • Average high temperature in September: 74.3°F

The warmest month (with the highest average high temperature) is July (84.7°F).
The month with the lowest average high temperature is December (37.4°F).

  • Average low temperature in September: 53.6°F

The month with the highest average low temperature is August (60.8°F).
The coldest month (with the lowest average low temperature) is December (27°F).

Average pressure in September
College Place, WA

Average pressure in September - College Place, WA
  • Average pressure in September: 29.95"Hg

The month with the highest atmospheric pressure is January (30.2"Hg).
The month with the lowest atmospheric pressure is August (29.9"Hg).

Average wind speed in September
College Place, WA

Average wind speed in September - College Place, WA
  • Average wind speed in September: 5.9mph

The windiest month (with the highest average wind speed) is April (7.9mph).
The calmest month (with the lowest average wind speed) is September (5.9mph).

Average humidity in September
College Place, WA

Average humidity in September - College Place, WA
  • Average humidity in September: 47%

The month with the highest relative humidity is January (81%).
The month with the lowest relative humidity is August (39%).

Average rainfall in September
College Place, WA

Average rainfall in September - College Place, WA
  • Average rainfall in September: 0.55"

The wettest month (with the highest rainfall) is March (2.01").
The driest month (with the least rainfall) is July (0.35").

Average rainfall days in September
College Place, WA

Average rainfall days in September - College Place, WA
  • Average rainfall days in September: 7.6 days

The month with the highest number of rainy days is March (17.4 days).
The month with the least rainy days is July (4.9 days).

Average snowfall in September
College Place, WA

Average snowfall in September - College Place, WA
  • Average snowfall in September: 0.08"

The month with the highest snowfall is February (2.91").
The months with the least snowfall are May, June, July, August and October (0").

Average snowfall days in September
College Place, WA

Average snowfall days in September - College Place, WA
  • Average snowfall days in September: 0.1 days

The months with the highest number of snowfall days are February and December (6.1 days).
The months with the least snowfall days are May, June, July and August (0 days).

Average daylight in September /
Average sunshine in September
College Place, WA

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

The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).

  • Average sunshine in September: 10h and 3min

The month with the most sunshine is August (Average sunshine: 12h and 6min).
The month with the least sunshine is January (Average sunshine: 5h and 18min).

Average sunshine days in September
College Place, WA

Average sunshine days in September - College Place, WA
  • Average sunshine days in September: 20.1 days

The month with the most sunshine days is July (24.4 days).
The month with the least sunshine days is February (10 days).

Average UV index in September
College Place, WA

Average UV index in September - College Place, WA
  • Average UV index in September: 4

The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 2).

Average cloud cover in September
College Place, WA

Average cloud cover in September - College Place, WA
  • Average cloud cover in September: 17

The months with the most cloud cover are January, February and December (Cloud cover 44).
The months with the least cloud cover are July and August (Cloud cover 10).

Average visibility in September
College Place, WA

Average visibility in September - College Place, WA
  • Average visibility in September: 6mi

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

College Place, Washington, USA

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