September weather forecast
Curtis, WA

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Weather in September

September, the first month of the autumn in Curtis, is also an agreeable month, with an average temperature ranging between min 46.9°F (8.3°C) and max 70.3°F (21.3°C).

Temperature

September's arrival subtly correlates with a reduction in the average high-temperature, down from a moderately hot 77.5°F (25.3°C) in August to a pleasant 70.3°F (21.3°C). September nights are characterized by a notable drop from daytime highs, with an average low-temperature of 46.9°F (8.3°C).

Humidity

In Curtis, the average relative humidity in September is 79%.

Rainfall

In Curtis, Washington, in September, during 11.3 rainfall days, 1.65" (42mm) of precipitation is typically accumulated. Throughout the year, there are 185.5 rainfall days, and 36.1" (917mm) of precipitation is accumulated.

Snowfall

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

Daylight

The average length of the day in September is 12h and 32min.
On the first day of the month, sunrise is at 6:33 am and sunset at 7:50 pm. On the last day of September, sunrise is at 7:10 am and sunset at 6:53 pm PDT.

Sunshine

In Curtis, the average sunshine in September is 8.3h.

UV index

In Curtis, the average daily maximum UV index in September is 3. A UV Index reading of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for average individuals.
Note: The maximum daily UV index, 3 in September, converts into the following recommendations:
Preventative actions are necessary - Recommendations to ward off sunburn are given. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. Boost your sun resistance with garments that are densely woven yet spacious.
Updated: Jun 14, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the temperature in September?

The average high-temperature, in September, in Curtis, is 70.3°F (21.3°C), while the average low-temperature is 46.9°F (8.3°C).

What is the average humidity in September?

In Curtis, the average relative humidity in September is 79%.

How many days does it rain in September?

In Curtis, in September, during 11.3 rainfall days, 1.65" (42mm) of precipitation is typically accumulated.

When it does not snow?

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

What is the average length of the day in September?

The average day length in September is 12h and 32min.

What time are sunrise and sunset in September?

On the first day of September, sunrise is at 6:33 am and sunset at 7:50 pm. On the last day of the month, sunrise is at 7:10 am and sunset at 6:53 pm PDT.

How many hours of sunshine does Curtis have in September?

In September, the average sunshine duration is 8.3h.

What is the UV index intensity in September?

In September, the average daily maximum UV index is 3. A UV Index estimate of 3 to 5 represents a medium health risk 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
Curtis, WA

Average temperature in September - Curtis, WA
  • Average high temperature in September: 70.3°F

The warmest month (with the highest average high temperature) is August (77.5°F).
The month with the lowest average high temperature is December (42.6°F).

  • Average low temperature in September: 46.9°F

The month with the highest average low temperature is August (50°F).
The coldest month (with the lowest average low temperature) is December (33.1°F).

Average pressure in September
Curtis, WA

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

The month with the highest atmospheric pressure is January (30.09"Hg).
The months with the lowest atmospheric pressure are March, August and September (30.02"Hg).

Average wind speed in September
Curtis, WA

Average wind speed in September - Curtis, WA
  • Average wind speed in September: 3.6mph

The windiest months (with the highest average wind speed) are January, March and November (4.5mph).
The calmest month (with the lowest average wind speed) is September (3.6mph).

Average humidity in September
Curtis, WA

Average humidity in September - Curtis, WA
  • Average humidity in September: 79%

The months with the highest relative humidity are January, February, November and December (89%).
The month with the lowest relative humidity is July (73%).

Average rainfall in September
Curtis, WA

Average rainfall in September - Curtis, WA
  • Average rainfall in September: 1.65"

The wettest month (with the highest rainfall) is January (5.51").
The driest month (with the least rainfall) is July (0.47").

Average rainfall days in September
Curtis, WA

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

The month with the highest number of rainy days is March (21.5 days).
The month with the least rainy days is August (6.4 days).

Average snowfall in September
Curtis, WA

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

The month with the highest snowfall is February (1.93").
The months with the least snowfall are April, May, June, July, August, September and October (0").

Average snowfall days in September
Curtis, WA

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

The month with the highest number of snowfall days is February (3.5 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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

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

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

  • Average sunshine in September: 8h and 2min

The month with the most sunshine is August (Average sunshine: 10h and 12min).
The month with the least sunshine is December (Average sunshine: 3h and 30min).

Average sunshine days in September
Curtis, WA

Average sunshine days in September - Curtis, WA
  • Average sunshine days in September: 16.9 days

The months with the most sunshine days are July and August (20.8 days).
The month with the least sunshine days is February (7.6 days).

Average UV index in September
Curtis, WA

Average UV index in September - Curtis, WA
  • Average UV index in September: 3

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).

Average cloud cover in September
Curtis, WA

Average cloud cover in September - Curtis, WA
  • Average cloud cover in September: 47

The months with the most cloud cover are January, February and December (Cloud cover 65).
The month with the least cloud cover is August (Cloud cover 38).

Average visibility in September
Curtis, WA

Average visibility in September - Curtis, WA
  • Average visibility in September: 4mi

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

Curtis, Washington, USA

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