September weather forecastGreenwater, WA
September
Weather in September
The first month of the autumn, September, is still a comfortable month in Greenwater, Washington, with temperature in the range of an average high of 67.3°F (19.6°C) and an average low of 45.9°F (7.7°C).Temperature
Greenwater, Washington, observes a small decrease in the average high-temperature with the arrival of September, falling from August's warm 73.9°F (23.3°C) to a comfortable 67.3°F (19.6°C). In Greenwater, the average nighttime temperature during September is a chilly 45.9°F (7.7°C).Humidity
In September, the average relative humidity in Greenwater, Washington, is 75%.Rainfall
In September, the rain falls for 12.7 days. Throughout September, 1.97" (50mm) of precipitation is accumulated. Throughout the year, in Greenwater, there are 181.2 rainfall days, and 38.82" (986mm) of precipitation is accumulated.Snowfall
May through October are months without snowfall.Daylight
The average length of the day in September in Greenwater is 12h and 32min.On the first day of September in Greenwater, sunrise is at 6:26 am and sunset at 7:45 pm. On the last day of the month, sunrise is at 7:05 am and sunset at 6:47 pm PDT.
Sunshine
In September, the average sunshine is 9h.UV index
In Greenwater, the average daily maximum UV index in September is 3. A UV Index value of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for average individuals.Note: In September, the maximum UV index of 3 translates into these guidelines:
Make use of precautions - Suggestions to resist sunburn are communicated. The midday Sun can be harmful due to its potent UV radiation; seek shade and reduce exposure. To cut down UV radiation exposure by about half, sport a wide-brim hat. Consider carefully! The reflective quality of snow can almost double the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Greenwater, WA
- Average high temperature in September: 67.3°F
The warmest month (with the highest average high temperature) is August (73.9°F).
The month with the lowest average high temperature is December (39.9°F).
- Average low temperature in September: 45.9°F
The month with the highest average low temperature is August (48.9°F).
The coldest month (with the lowest average low temperature) is December (30.2°F).
Average pressure in September
Greenwater, WA
- Average pressure in September: 30"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is August (29.99"Hg).
Average wind speed in September
Greenwater, WA
- Average wind speed in September: 3.9mph
The windiest month (with the highest average wind speed) is January (5.3mph).
The calmest month (with the lowest average wind speed) is August (3.6mph).
Average humidity in September
Greenwater, WA
- Average humidity in September: 75%
The months with the highest relative humidity are January and February (87%).
The month with the lowest relative humidity is July (70%).
Average rainfall in September
Greenwater, WA
- Average rainfall in September: 1.97"
The wettest month (with the highest rainfall) is January (5.71").
The driest month (with the least rainfall) is July (0.59").
Average rainfall days in September
Greenwater, WA
- Average rainfall days in September: 12.7 days
The month with the highest number of rainy days is March (20.4 days).
The month with the least rainy days is August (6.8 days).
Average snowfall in September
Greenwater, WA
- Average snowfall in September: 0"
The month with the highest snowfall is February (4.76").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Greenwater, WA
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is February (5.9 days).
The months with the least snowfall days are June, July, August and October (0 days).
Average daylight in September /
Average sunshine in September
Greenwater, WA
- Average daylight in September: 12h and 30min
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 36min).
- Average sunshine in September: 9h and 0min
The month with the most sunshine is August (Average sunshine: 10h and 42min).
The month with the least sunshine is December (Average sunshine: 3h and 54min).
Average sunshine days in September
Greenwater, WA
- Average sunshine days in September: 15.5 days
The month with the most sunshine days is August (22.1 days).
The month with the least sunshine days is February (8.8 days).
Average UV index in September
Greenwater, WA
- Average UV index in September: 3
The month with the highest UV index is July (UV index 5).
The month with the lowest UV index is November (UV index 1).
Average cloud cover in September
Greenwater, WA
- Average cloud cover in September: 38
The month with the most cloud cover is March (Cloud cover 59).
The month with the least cloud cover is August (Cloud cover 27).
Average visibility in September
Greenwater, WA
- Average visibility in September: 5mi
The months with the highest visibility are May, June, July, August, September and October (5mi).
The months with the lowest visibility are January, February, March, April, November and December (4mi).
