Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
South Colby's weather subtly changes with the onset of September, barely falling from a warm 77.2°F (25.1°C) in August to a pleasant 70°F (21.1°C). During September, the temperature is averaged to a low of 50.9°F (10.5°C) at night.Humidity
The average relative humidity in September is 75%.Rainfall
In South Colby, in September, during 9.9 rainfall days, 0.59" (15mm) of precipitation is typically accumulated. Throughout the year, there are 138.9 rainfall days, and 12.24" (311mm) of precipitation is accumulated.Snowfall
In South Colby, snow does not fall in April through October.Daylight
In September, the average length of the day is 12h and 32min.On the first day of the month, sunrise is at 6:30 am and sunset at 7:49 pm. On the last day of September, sunrise is at 7:08 am and sunset at 6:50 pm PDT.
Sunshine
The average sunshine in September is 9.3h.UV index
In September, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for the ordinary person.Note: The daily high UV index of 4 in September translates into this advice:
Take precautions. Light skin individuals may get burned in less than 30 minutes. For health reasons, it's advisable to reduce direct sun exposure during peak hours around midday. 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
What is the usual temperature for South Colby in September?
What is the average humidity in September in South Colby?
How much does it rain in South Colby in September?
When it does not snow?
How many hours of daylight does South Colby have in September?
What time are sunrise and sunset in September?
How long on average sun shines in September?
How high is the UV index in September in South Colby?
Average temperature in September
South Colby, WA
- Average high temperature in September: 70°F
The warmest month (with the highest average high temperature) is August (77.2°F).
The month with the lowest average high temperature is December (43.2°F).
- Average low temperature in September: 50.9°F
The month with the highest average low temperature is August (53.6°F).
The coldest month (with the lowest average low temperature) is December (34.9°F).
Average pressure in September
South Colby, WA
- Average pressure in September: 30.01"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 (30.01"Hg).
Average wind speed in September
South Colby, WA
- Average wind speed in September: 4.1mph
The windiest month (with the highest average wind speed) is March (5.5mph).
The calmest months (with the lowest average wind speed) are July and August (3.5mph).
Average humidity in September
South Colby, WA
- Average humidity in September: 75%
The month with the highest relative humidity is December (87%).
The month with the lowest relative humidity is July (69%).
Average rainfall in September
South Colby, WA
- Average rainfall in September: 0.59"
The wettest months (with the highest rainfall) are January and December (2.05").
The driest month (with the least rainfall) is July (0.28").
Average rainfall days in September
South Colby, WA
- Average rainfall days in September: 9.9 days
The month with the highest number of rainy days is March (15.3 days).
The month with the least rainy days is August (5.4 days).
Average snowfall in September
South Colby, WA
- Average snowfall in September: 0"
The month with the highest snowfall is February (1.22").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
South Colby, WA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (2.8 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
South Colby, WA
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 30min).
- Average sunshine in September: 9h and 2min
The month with the most sunshine is August (Average sunshine: 10h and 42min).
The month with the least sunshine is December (Average sunshine: 4h and 6min).
Average sunshine days in September
South Colby, WA
- Average sunshine days in September: 18.5 days
The month with the most sunshine days is August (22.8 days).
The month with the least sunshine days is February (11.8 days).
Average UV index in September
South Colby, 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).
Average cloud cover in September
South Colby, WA
- Average cloud cover in September: 34
The month with the most cloud cover is December (Cloud cover 58).
The month with the least cloud cover is August (Cloud cover 25).
Average visibility in September
South Colby, WA
- Average visibility in September: 6mi
The months with the highest visibility are May, June, July, August and September (6mi).
The months with the lowest visibility are January, February, March, April, October, November and December (5mi).
South Colby, Washington, USA
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