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 the commencement of September, Sudden Valley records a moderate temperature decline, with the average high easing from August's agreeable 71.1°F (21.7°C) to an enjoyable 65.3°F (18.5°C). In September, Sudden Valley encounters an average low-temperature of 49.5°F (9.7°C) during the night.Humidity
In Sudden Valley, the average relative humidity in September is 79%.Rainfall
In Sudden Valley, in September, it is raining for 5.8 days, with typically 0.35" (9mm) of accumulated precipitation. In Sudden Valley, during the entire year, the rain falls for 104.5 days and collects up to 7.01" (178mm) of precipitation.Snowfall
In Sudden Valley, snow does not fall in May through October.Daylight
In September, the average length of the day in Sudden Valley is 12h and 34min.On the first day of the month, sunrise is at 6:27 am and sunset at 7:50 pm. On the last day of September, sunrise is at 7:08 am and sunset at 6:49 pm PDT.
Sunshine
The average sunshine in September is 9.2h.UV index
In September, the average daily maximum UV index in Sudden Valley is 3. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for the average person.Note: The UV index of 3 during September translates into the following guidance:
Proceed with care. Light skin individuals may be exposed to burns in fewer than 30 minutes. Stay safe from the Sun's strongest UV rays by limiting exposure during midday. Stay sun-safe with clothing that is both closely woven and worn loosely.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Sudden Valley in September?
What is the average humidity in September in Sudden Valley?
How much does it rain in Sudden Valley in September?
When it does not snow in Sudden Valley?
What is the average length of the day in September in Sudden Valley?
When are sunrise and sunset in September in Sudden Valley?
How long on average sun shines in September in Sudden Valley?
How high is the UV index in September in Sudden Valley?
Average temperature in September
Sudden Valley, WA
- Average high temperature in September: 65.3°F
The warmest month (with the highest average high temperature) is August (71.1°F).
The month with the lowest average high temperature is December (41.7°F).
- Average low temperature in September: 49.5°F
The month with the highest average low temperature is August (52.7°F).
The coldest months (with the lowest average low temperature) are February and December (34.3°F).
Average pressure in September
Sudden Valley, WA
- Average pressure in September: 30.01"Hg
The month with the highest atmospheric pressure is January (30.08"Hg).
The month with the lowest atmospheric pressure is March (30"Hg).
Average wind speed in September
Sudden Valley, WA
- Average wind speed in September: 3.8mph
The windiest months (with the highest average wind speed) are November and December (5.8mph).
The calmest month (with the lowest average wind speed) is August (3.5mph).
Average humidity in September
Sudden Valley, WA
- Average humidity in September: 79%
The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is July (74%).
Average rainfall in September
Sudden Valley, WA
- Average rainfall in September: 0.35"
The wettest month (with the highest rainfall) is January (1.1").
The driest months (with the least rainfall) are July and August (0.2").
Average rainfall days in September
Sudden Valley, WA
- Average rainfall days in September: 5.8 days
The month with the highest number of rainy days is November (13.6 days).
The month with the least rainy days is August (3.1 days).
Average snowfall in September
Sudden Valley, WA
- Average snowfall in September: 0"
The month with the highest snowfall is February (0.63").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Sudden Valley, WA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (3.4 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
Sudden Valley, WA
- Average daylight in September: 12h and 4min
The month with the longest days is June (Average daylight: 16h and 6min).
The month with the shortest days is December (Average daylight: 8h and 24min).
- Average sunshine in September: 9h and 1min
The month with the most sunshine is August (Average sunshine: 10h and 36min).
The months with the least sunshine are January and December (Average sunshine: 4h and 12min).
Average sunshine days in September
Sudden Valley, WA
- Average sunshine days in September: 19.4 days
The month with the most sunshine days is August (24.9 days).
The month with the least sunshine days is November (11.3 days).
Average UV index in September
Sudden Valley, 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, November and December (UV index 2).
Average cloud cover in September
Sudden Valley, WA
- Average cloud cover in September: 34
The months with the most cloud cover are January, February, March and December (Cloud cover 56).
The months with the least cloud cover are July and August (Cloud cover 26).
Average visibility in September
Sudden Valley, WA
- Average visibility in September: 6mi
The months with the highest visibility are April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February and March (5mi).
Sudden Valley, Washington, USA
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