September weather forecastKlaus, WA
September
Weather in September
The first month of the autumn, September, is still a pleasant month in Klaus, Washington, with an average temperature varying between 46°F (7.8°C) and 69.6°F (20.9°C).Temperature
Klaus observes a small decrease in the average high-temperature with the arrival of September, falling from August's warm 76.6°F (24.8°C) to an agreeable 69.6°F (20.9°C). In Klaus, the nighttime chill during September is a clear shift from the day's highs, with an average of 46°F (7.8°C).Humidity
The average relative humidity in September is 78%.Rainfall
In Klaus, in September, during 10.6 rainfall days, 1.18" (30mm) of precipitation is typically accumulated. Throughout the year, there are 170.1 rainfall days, and 22.56" (573mm) of precipitation is accumulated.Snowfall
In Klaus, 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 September, sunrise is at 6:32 am and sunset at 7:49 pm. On the last day of the month, sunrise is at 7:09 am and sunset at 6:52 pm PDT.
Sunshine
In September, the average sunshine is 8.4h.UV index
In Klaus, the average daily maximum UV index in September is 3. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for the average person.Note: A maximum high UV index of 3 in September translates into the following recommendations:
Be mindful. Those with pale skin might receive burns in fewer than 30 minutes. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Klaus, WA
- Average high temperature in September: 69.6°F
The warmest month (with the highest average high temperature) is August (76.6°F).
The month with the lowest average high temperature is December (42.3°F).
- Average low temperature in September: 46°F
The month with the highest average low temperature is August (48.6°F).
The coldest month (with the lowest average low temperature) is December (32.4°F).
Average pressure in September
Klaus, WA
- Average pressure in September: 30.01"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The months with the lowest atmospheric pressure are August and September (30.01"Hg).
Average wind speed in September
Klaus, WA
- Average wind speed in September: 3.5mph
The windiest month (with the highest average wind speed) is January (4.8mph).
The calmest months (with the lowest average wind speed) are August and September (3.5mph).
Average humidity in September
Klaus, WA
- Average humidity in September: 78%
The months with the highest relative humidity are January, February, November and December (88%).
The month with the lowest relative humidity is July (73%).
Average rainfall in September
Klaus, WA
- Average rainfall in September: 1.18"
The wettest month (with the highest rainfall) is January (3.54").
The driest months (with the least rainfall) are July and August (0.39").
Average rainfall days in September
Klaus, WA
- Average rainfall days in September: 10.6 days
The month with the highest number of rainy days is March (19.4 days).
The month with the least rainy days is August (6.1 days).
Average snowfall in September
Klaus, WA
- Average snowfall in September: 0"
The month with the highest snowfall is January (1.81").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Klaus, WA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (3.4 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
Klaus, WA
- Average daylight in September: 12h and 30min
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 24min
The month with the most sunshine is August (Average sunshine: 10h and 18min).
The months with the least sunshine are January, February and December (Average sunshine: 3h and 42min).
Average sunshine days in September
Klaus, WA
- Average sunshine days in September: 17.5 days
The month with the most sunshine days is August (22.1 days).
The month with the least sunshine days is February (9 days).
Average UV index in September
Klaus, 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
Klaus, WA
- Average cloud cover in September: 45
The months with the most cloud cover are February and March (Cloud cover 64).
The month with the least cloud cover is August (Cloud cover 37).
Average visibility in September
Klaus, 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).
