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
The start of September sees the average high-temperature at a still refreshing 63.3°F (17.4°C), showing little difference from August's 67.3°F (19.6°C). An average low-temperature of 53.2°F (11.8°C) is common in Greenbank during the nights of September.Humidity
In Greenbank, the average relative humidity in September is 79%.Rainfall
In Greenbank, during September, the rain falls for 12.9 days and regularly aggregates up to 1.73" (44mm) of precipitation. In Greenbank, during the entire year, the rain falls for 183.3 days and collects up to 23.03" (585mm) of precipitation.Snowfall
May through October are months without snowfall.Daylight
The average length of the day in September in Greenbank is 12h and 33min.On the first day of the month, sunrise is at 6:29 am and sunset at 7:50 pm. On the last day of September, in Greenbank, Washington, sunrise is at 7:09 am and sunset at 6:50 pm PDT.
Sunshine
The average sunshine in September is 9.5h.UV index
The average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate threat to health from unprotected exposure to Sun's UV rays for the average person.Note: The maximum daily UV index of 4 in September interprets into the following recommendations:
Take precautions - Protection against sunburn is recommended. Considering the harmful UV rays from the Sun during midday, it's essential to reduce exposure. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance.
Frequently asked questions
What is the usual temperature for Greenbank in September?
What is the average humidity in September in Greenbank?
How many days does it rain in September in Greenbank?
When it does not snow in Greenbank?
How many hours of daylight does Greenbank have in September?
When are sunrise and sunset in September in Greenbank?
How many hours of sunshine does Greenbank have in September?
What is the UV index reading in September in Greenbank?
Average temperature in September
Greenbank, WA
- Average high temperature in September: 63.3°F
The warmest month (with the highest average high temperature) is August (67.3°F).
The month with the lowest average high temperature is December (43.5°F).
- Average low temperature in September: 53.2°F
The month with the highest average low temperature is August (55.9°F).
The coldest month (with the lowest average low temperature) is December (37.9°F).
Average pressure in September
Greenbank, WA
- Average pressure in September: 30.01"Hg
The month with the highest atmospheric pressure is January (30.08"Hg).
The months with the lowest atmospheric pressure are March, August and September (30.01"Hg).
Average wind speed in September
Greenbank, WA
- Average wind speed in September: 4.7mph
The windiest month (with the highest average wind speed) is November (8mph).
The calmest month (with the lowest average wind speed) is August (4mph).
Average humidity in September
Greenbank, WA
- Average humidity in September: 79%
The month with the highest relative humidity is January (82%).
The month with the lowest relative humidity is July (76%).
Average rainfall in September
Greenbank, WA
- Average rainfall in September: 1.73"
The wettest month (with the highest rainfall) is November (3.19").
The driest month (with the least rainfall) is July (0.43").
Average rainfall days in September
Greenbank, WA
- Average rainfall days in September: 12.9 days
The month with the highest number of rainy days is March (20.7 days).
The month with the least rainy days is August (6.9 days).
Average snowfall in September
Greenbank, WA
- Average snowfall in September: 0"
The month with the highest snowfall is February (3.07").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Greenbank, WA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (3.1 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
Greenbank, WA
- Average daylight in September: 12h and 4min
The month with the longest days is June (Average daylight: 16h and 0min).
The month with the shortest days is December (Average daylight: 8h and 24min).
- Average sunshine in September: 9h and 3min
The months with the most sunshine are July and August (Average sunshine: 10h and 54min).
The month with the least sunshine is January (Average sunshine: 4h and 36min).
Average sunshine days in September
Greenbank, WA
- Average sunshine days in September: 15.1 days
The month with the most sunshine days is August (23 days).
The month with the least sunshine days is February (8 days).
Average UV index in September
Greenbank, WA
- Average UV index in September: 4
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
Greenbank, WA
- Average cloud cover in September: 30
The months with the most cloud cover are January, February and December (Cloud cover 51).
The month with the least cloud cover is August (Cloud cover 22).
Average visibility in September
Greenbank, 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).
Greenbank, Washington, USA
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