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 brings a drop in Roosevelt's average high-temperature, falling from 84.7°F (29.3°C) in August to a still moderately hot 73.9°F (23.3°C). Nighttime temperature lowers to an average of 54.9°F (12.7°C) in September.Humidity
In Roosevelt, the average relative humidity in September is 48%.Rainfall
In September, the rain falls for 5.5 days. Throughout September, 0.31" (8mm) of precipitation is accumulated. In Roosevelt, during the entire year, the rain falls for 107.9 days and collects up to 8.46" (215mm) of precipitation.Snowfall
April through October are months without snowfall in Roosevelt, Washington.Daylight
In Roosevelt, Washington, the average length of the day in September is 12h and 31min.On the first day of the month, sunrise is at 6:23 am and sunset at 7:38 pm. On the last day of September, in Roosevelt, sunrise is at 6:58 am and sunset at 6:42 pm PDT.
Sunshine
In September, the average sunshine in Roosevelt is 10.9h.UV index
In Roosevelt, 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 exposure to the Sun's UV rays for the ordinary person.Note: The daily maximum UV index of 4 in September interprets into the following advice:
Take necessary precautions - Suggestions to elude sunburn are provided. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage. Foresee this! The reflection from snow can nearly double the intensity of UV radiation from the Sun.
Frequently asked questions
What is the usual temperature for Roosevelt in September?
What is the average humidity in September in Roosevelt?
How many days does it rain in September in Roosevelt?
When it does not snow in Roosevelt?
What is the average length of the day in September in Roosevelt?
When are sunrise and sunset in September in Roosevelt?
How many hours of sunshine does Roosevelt have in September?
What is the UV index intensity in September in Roosevelt?
Average temperature in September
Roosevelt, WA
- Average high temperature in September: 73.9°F
The warmest month (with the highest average high temperature) is July (85.5°F).
The month with the lowest average high temperature is December (36.5°F).
- Average low temperature in September: 54.9°F
The month with the highest average low temperature is August (61.3°F).
The coldest month (with the lowest average low temperature) is December (26.6°F).
Average pressure in September
Roosevelt, WA
- Average pressure in September: 29.97"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is August (29.93"Hg).
Average wind speed in September
Roosevelt, WA
- Average wind speed in September: 7.5mph
The windiest month (with the highest average wind speed) is June (9.2mph).
The calmest month (with the lowest average wind speed) is January (6.3mph).
Average humidity in September
Roosevelt, WA
- Average humidity in September: 48%
The month with the highest relative humidity is January (83%).
The months with the lowest relative humidity are July and August (40%).
Average rainfall in September
Roosevelt, WA
- Average rainfall in September: 0.31"
The wettest month (with the highest rainfall) is January (1.1").
The driest month (with the least rainfall) is July (0.24").
Average rainfall days in September
Roosevelt, WA
- Average rainfall days in September: 5.5 days
The month with the highest number of rainy days is March (12.3 days).
The month with the least rainy days is July (4.4 days).
Average snowfall in September
Roosevelt, WA
- Average snowfall in September: 0"
The month with the highest snowfall is February (3.86").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Roosevelt, WA
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is December (4.8 days).
The months with the least snowfall days are April, May, June, July, August and October (0 days).
Average daylight in September /
Average sunshine in September
Roosevelt, WA
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in September: 10h and 5min
The months with the most sunshine are July and August (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 5h and 12min).
Average sunshine days in September
Roosevelt, WA
- Average sunshine days in September: 22.1 days
The month with the most sunshine days is July (25 days).
The month with the least sunshine days is February (14 days).
Average UV index in September
Roosevelt, WA
- Average UV index in September: 4
The months with the highest UV index are June and 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
Roosevelt, WA
- Average cloud cover in September: 16
The month with the most cloud cover is January (Cloud cover 48).
The month with the least cloud cover is July (Cloud cover 9).
Average visibility in September
Roosevelt, WA
- Average visibility in September: 6mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
Roosevelt, Washington, USA
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