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
With September's onset, the weather reveals a slight temperature decrease, transitioning from a moderately hot 77.4°F (25.2°C) in August to a pleasant 70.3°F (21.3°C). An average low-temperature of 49.8°F (9.9°C) is observed during September nights in Allyn.Humidity
In September, the average relative humidity in Allyn is 75%.Rainfall
In Allyn, during September, the rain falls for 11.4 days and regularly aggregates up to 1.3" (33mm) of precipitation. In Allyn, during the entire year, the rain falls for 175.2 days and collects up to 30.43" (773mm) of precipitation.Snowfall
In Allyn, snow does not fall in May through October.Daylight
The average length of the day in September in Allyn is 12h and 32min.On the first day of the month, sunrise is at 6:31 am and sunset at 7:50 pm. On the last day of September, sunrise is at 7:10 am and sunset at 6:51 pm PDT.
Sunshine
In Allyn, the average sunshine in September is 9.2h.UV index
The average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV radiation for the average person.Note: In September, an average UV index of 4 transforms into the following instructions:
Safety measures are advised. Light-skinned individuals may experience burns in under half an hour. Minimize direct exposure to the Sun during midday when its radiation is at its peak. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in September in Allyn?
What is the average humidity in September in Allyn?
How many days does it rain in September in Allyn?
When it does not snow in Allyn?
What is the average length of the day in September in Allyn?
When is the sunrise / sunset in September in Allyn?
How long on average sun shines in September in Allyn?
What is the UV index reading in September in Allyn?
Average temperature in September
Allyn, WA
- Average high temperature in September: 70.3°F
The warmest month (with the highest average high temperature) is August (77.4°F).
The month with the lowest average high temperature is December (42.3°F).
- Average low temperature in September: 49.8°F
The month with the highest average low temperature is August (53.2°F).
The coldest month (with the lowest average low temperature) is December (33.8°F).
Average pressure in September
Allyn, WA
- Average pressure in September: 30.02"Hg
The month with the highest atmospheric pressure is January (30.09"Hg).
The month with the lowest atmospheric pressure is March (30.01"Hg).
Average wind speed in September
Allyn, WA
- Average wind speed in September: 4mph
The windiest month (with the highest average wind speed) is March (5.2mph).
The calmest months (with the lowest average wind speed) are July and August (3.5mph).
Average humidity in September
Allyn, WA
- Average humidity in September: 75%
The month with the highest relative humidity is December (88%).
The month with the lowest relative humidity is July (69%).
Average rainfall in September
Allyn, WA
- Average rainfall in September: 1.3"
The wettest month (with the highest rainfall) is December (5").
The driest month (with the least rainfall) is July (0.43").
Average rainfall days in September
Allyn, WA
- Average rainfall days in September: 11.4 days
The month with the highest number of rainy days is March (19.7 days).
The month with the least rainy days is August (6 days).
Average snowfall in September
Allyn, WA
- Average snowfall in September: 0"
The month with the highest snowfall is February (2.91").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Allyn, WA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (3.8 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
Allyn, 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: 9h and 1min
The month with the most sunshine is August (Average sunshine: 10h and 36min).
The month with the least sunshine is December (Average sunshine: 3h and 48min).
Average sunshine days in September
Allyn, WA
- Average sunshine days in September: 17.1 days
The month with the most sunshine days is August (22.3 days).
The month with the least sunshine days is November (8.7 days).
Average UV index in September
Allyn, WA
- Average UV index in September: 4
The month with the highest UV index is 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
Allyn, WA
- Average cloud cover in September: 35
The month with the most cloud cover is December (Cloud cover 60).
The month with the least cloud cover is August (Cloud cover 26).
Average visibility in September
Allyn, WA
- Average visibility in September: 5mi
The months with the highest visibility are June, July and August (6mi).
The months with the lowest visibility are January, February, November and December (4mi).
Allyn, Washington, USA
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