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
September implies a gentle temperature shift, with average high-temperatures reducing from August's moderately hot 83.7°F (28.7°C) to an agreeable 72.9°F (22.7°C). Nine Mile Falls encounters a substantial decline from its daily high to a low-temperature of 50.7°F (10.4°C) during September nights.Humidity
In September, the average relative humidity is 48%.Rainfall
In September, the rain falls for 7.5 days. Throughout September, 0.63" (16mm) of precipitation is accumulated. In Nine Mile Falls, during the entire year, the rain falls for 127.8 days and collects up to 16.93" (430mm) of precipitation.Snowfall
January through May, September through December are months with snowfall. September is the first month it typically snows in Nine Mile Falls. Throughout September, in the average 0.2 snowfall days, it receives 0.47" (12mm) of snow. In Nine Mile Falls, during the entire year, snow falls for 62.3 days and aggregates up to 37.83" (961mm) of snow.Daylight
The average length of the day in September in Nine Mile Falls is 12h and 33min.On the first day of the month, sunrise is at 6:09 am and sunset at 7:30 pm. On the last day of September, sunrise is at 6:49 am and sunset at 6:30 pm PDT.
Sunshine
The average sunshine in September is 10.2h.UV index
In September, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for the ordinary person.Note: A typical high UV index of 4 in September suggests the following recommendations:
Take care. Persons with lighter skin might suffer burns in less than 30 minutes. The Sun's radiation is especially intense around midday; try to stay in shade during this period. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage. Take into account! The reflection from snow can nearly double the Sun's UV radiation intensity.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures in Nine Mile Falls?
What is the average humidity in September?
How many days does it rain in September?
When does it start snowing?
How many hours of daylight does Nine Mile Falls have in September?
When are sunrise and sunset in September?
How long on average sun shines in September?
How high is the UV index in September?
Average temperature in September
Nine Mile Falls, WA
- Average high temperature in September: 72.9°F
The warmest months (with the highest average high temperature) are July and August (83.7°F).
The month with the lowest average high temperature is December (32.2°F).
- Average low temperature in September: 50.7°F
The month with the highest average low temperature is August (59°F).
The coldest month (with the lowest average low temperature) is December (22.1°F).
Average pressure in September
Nine Mile Falls, WA
- Average pressure in September: 29.96"Hg
The month with the highest atmospheric pressure is January (30.19"Hg).
The month with the lowest atmospheric pressure is August (29.9"Hg).
Average wind speed in September
Nine Mile Falls, WA
- Average wind speed in September: 5.9mph
The windiest month (with the highest average wind speed) is April (7.3mph).
The calmest month (with the lowest average wind speed) is August (5.7mph).
Average humidity in September
Nine Mile Falls, WA
- Average humidity in September: 48%
The month with the highest relative humidity is January (89%).
The month with the lowest relative humidity is August (38%).
Average rainfall in September
Nine Mile Falls, WA
- Average rainfall in September: 0.63"
The wettest month (with the highest rainfall) is March (2.13").
The driest month (with the least rainfall) is August (0.35").
Average rainfall days in September
Nine Mile Falls, WA
- Average rainfall days in September: 7.5 days
The month with the highest number of rainy days is April (16.3 days).
The month with the least rainy days is July (4.9 days).
Average snowfall in September
Nine Mile Falls, WA
- Average snowfall in September: 0.47"
The month with the highest snowfall is January (10.39").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Nine Mile Falls, WA
- Average snowfall days in September: 0.2 days
The month with the highest number of snowfall days is December (15.6 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Nine Mile Falls, 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: 10h and 1min
The month with the most sunshine is August (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 3h and 54min).
Average sunshine days in September
Nine Mile Falls, WA
- Average sunshine days in September: 20.3 days
The month with the most sunshine days is July (24.1 days).
The month with the least sunshine days is March (9.8 days).
Average UV index in September
Nine Mile Falls, WA
- Average UV index in September: 4
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are February and December (UV index 1).
Average cloud cover in September
Nine Mile Falls, WA
- Average cloud cover in September: 20
The months with the most cloud cover are January and December (Cloud cover 59).
The months with the least cloud cover are July and August (Cloud cover 13).
Average visibility in September
Nine Mile Falls, WA
- Average visibility in September: 6mi
The months with the highest visibility are March, April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January and December (4mi).
Nine Mile Falls, Washington, USA
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