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 beginning of September brings a slight decrease in the average high-temperature, transitioning from a moderately hot 73.4°F (23°C) in August to a refreshing 66.4°F (19.1°C). During the nights in September, Sultan experiences a consistent average temperature of 45°F (7.2°C).Humidity
The average relative humidity in September in Sultan is 77%.Rainfall
In Sultan, in September, it is raining for 12.8 days, with typically 2.24" (57mm) of accumulated precipitation. In Sultan, during the entire year, the rain falls for 200.6 days and collects up to 51.65" (1312mm) of precipitation.Snowfall
In Sultan, snow does not fall in May through October.Daylight
The average length of the day in September in Sultan, Washington, is 12h and 33min.On the first day of the month, sunrise is at 6:26 am and sunset at 7:47 pm. On the last day of September, sunrise is at 7:06 am and sunset at 6:47 pm PDT.
Sunshine
In Sultan, the average sunshine in September is 8.7h.UV index
The average daily maximum UV index in September in Sultan is 3. A UV Index reading of 3 to 5 represents a moderate threat to health from unsafe exposure to UV radiation for ordinary individuals.Note: The UV index of 3 during September translates into the following guidance:
Take care. Persons with lighter skin might suffer burns in less than 30 minutes. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly.
Frequently asked questions
What is the temperature in September in Sultan?
What is the average humidity in September in Sultan?
How much does it rain in Sultan in September?
When it does not snow in Sultan?
How many hours of daylight does Sultan have in September?
When are sunrise and sunset in September in Sultan?
How long on average sun shines in September in Sultan?
What is the UV index reading in September in Sultan?
Average temperature in September
Sultan, WA
- Average high temperature in September: 66.4°F
The warmest month (with the highest average high temperature) is August (73.4°F).
The month with the lowest average high temperature is December (38.3°F).
- Average low temperature in September: 45°F
The month with the highest average low temperature is August (48°F).
The coldest month (with the lowest average low temperature) is December (28.6°F).
Average pressure in September
Sultan, 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
Sultan, WA
- Average wind speed in September: 3.3mph
The windiest month (with the highest average wind speed) is January (4.8mph).
The calmest month (with the lowest average wind speed) is August (3.2mph).
Average humidity in September
Sultan, WA
- Average humidity in September: 77%
The months with the highest relative humidity are January, February and March (88%).
The month with the lowest relative humidity is July (72%).
Average rainfall in September
Sultan, WA
- Average rainfall in September: 2.24"
The wettest month (with the highest rainfall) is January (7.8").
The driest month (with the least rainfall) is August (0.79").
Average rainfall days in September
Sultan, WA
- Average rainfall days in September: 12.8 days
The month with the highest number of rainy days is March (22.3 days).
The month with the least rainy days is August (7.9 days).
Average snowfall in September
Sultan, WA
- Average snowfall in September: 0"
The month with the highest snowfall is February (5.43").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Sultan, WA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (5.2 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
Sultan, 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 30min).
- Average sunshine in September: 8h and 4min
The month with the most sunshine is August (Average sunshine: 10h and 24min).
The months with the least sunshine are January and December (Average sunshine: 3h and 42min).
Average sunshine days in September
Sultan, WA
- Average sunshine days in September: 15 days
The month with the most sunshine days is August (19.9 days).
The month with the least sunshine days is March (7 days).
Average UV index in September
Sultan, WA
- Average UV index in September: 3
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, March, April, October, November and December (UV index 2).
Average cloud cover in September
Sultan, WA
- Average cloud cover in September: 41
The months with the most cloud cover are March and December (Cloud cover 61).
The month with the least cloud cover is August (Cloud cover 30).
Average visibility in September
Sultan, 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).
Sultan, Washington, USA
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