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
As September arrives, Maple Valley's weather displays a minor decrease in high-temperatures, transitioning from August's moderately hot 75.4°F (24.1°C) to an agreeable 68.4°F (20.2°C). In September, Maple Valley experiences a temperature dip to an average of 47.3°F (8.5°C) at night.Humidity
In Maple Valley, the average relative humidity in September is 75%.Rainfall
In Maple Valley, in September, during 11.9 rainfall days, 1.73" (44mm) of precipitation is typically accumulated. Throughout the year, there are 182.4 rainfall days, and 36.77" (934mm) of precipitation is accumulated.Snowfall
May through October are months without snowfall in Maple Valley, Washington.Daylight
In Maple Valley, the average length of the day in September is 12h and 32min.On the first day of September in Maple Valley, sunrise is at 6:28 am and sunset at 7:47 pm. On the last day of the month, sunrise is at 7:06 am and sunset at 6:48 pm PDT.
Sunshine
The average sunshine in September is 9.1h.UV index
In September, the average daily maximum UV index is 3. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for the ordinary person.Note: In September, the maximum UV index of 3 translates into these guidelines:
Take heed. Individuals of lighter complexion can be burned in less than half an hour. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. Opt for tightly woven and loose clothing to enhance protection from the Sun. Remember! The Sun's UV radiation can be magnified almost twofold by the reflection of snow.
Frequently asked questions
What is the usual temperature for Maple Valley in September?
What is the average humidity in September in Maple Valley?
How much does it rain in Maple Valley in September?
When it does not snow in Maple Valley?
What is the average length of the day in September in Maple Valley?
When are sunrise and sunset in September in Maple Valley?
How long on average sun shines in September in Maple Valley?
How high is the UV index in September in Maple Valley?
Average temperature in September
Maple Valley, WA
- Average high temperature in September: 68.4°F
The warmest month (with the highest average high temperature) is August (75.4°F).
The month with the lowest average high temperature is December (40.8°F).
- Average low temperature in September: 47.3°F
The month with the highest average low temperature is August (50.2°F).
The coldest month (with the lowest average low temperature) is February (31.6°F).
Average pressure in September
Maple Valley, WA
- Average pressure in September: 30"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The months with the lowest atmospheric pressure are August and September (30"Hg).
Average wind speed in September
Maple Valley, WA
- Average wind speed in September: 3.7mph
The windiest month (with the highest average wind speed) is January (5.2mph).
The calmest month (with the lowest average wind speed) is August (3.5mph).
Average humidity in September
Maple Valley, WA
- Average humidity in September: 75%
The months with the highest relative humidity are January and February (86%).
The month with the lowest relative humidity is July (70%).
Average rainfall in September
Maple Valley, WA
- Average rainfall in September: 1.73"
The wettest month (with the highest rainfall) is December (5.43").
The driest month (with the least rainfall) is July (0.59").
Average rainfall days in September
Maple Valley, WA
- Average rainfall days in September: 11.9 days
The month with the highest number of rainy days is March (20.5 days).
The month with the least rainy days is August (6.7 days).
Average snowfall in September
Maple Valley, WA
- Average snowfall in September: 0"
The month with the highest snowfall is February (4.17").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Maple Valley, WA
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is February (6 days).
The months with the least snowfall days are June, July, August and October (0 days).
Average daylight in September /
Average sunshine in September
Maple Valley, 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 42min).
The months with the least sunshine are January and December (Average sunshine: 4h and 6min).
Average sunshine days in September
Maple Valley, WA
- Average sunshine days in September: 16.8 days
The month with the most sunshine days is August (22 days).
The month with the least sunshine days is February (8.4 days).
Average UV index in September
Maple Valley, 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
Maple Valley, WA
- Average cloud cover in September: 37
The months with the most cloud cover are January, February, March and December (Cloud cover 57).
The month with the least cloud cover is August (Cloud cover 27).
Average visibility in September
Maple Valley, WA
- Average visibility in September: 5mi
The months with the highest visibility are July and August (6mi).
The months with the lowest visibility are January, February and December (4mi).
Maple Valley, Washington, USA
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