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 average high-temperature slightly decreases in September, shifting from a pleasant 73°F (22.8°C) in August to a refreshing 67.1°F (19.5°C). In Granite Falls, September nights witness a steady temperature drop to a cool 50°F (10°C).Humidity
The average relative humidity in September in Granite Falls, Washington, is 77%.Rainfall
In Granite Falls, during September, the rain falls for 12.3 days and regularly aggregates up to 1.77" (45mm) of precipitation. In Granite Falls, during the entire year, the rain falls for 179.1 days and collects up to 29.57" (751mm) of precipitation.Snowfall
In Granite Falls, snow does not fall in May through October.Daylight
In Granite Falls, the average length of the day in September is 12h and 33min.On the first day of the month, sunrise is at 6:27 am and sunset at 7:48 pm. On the last day of September, in Granite Falls, sunrise is at 7:06 am and sunset at 6:48 pm PDT.
Sunshine
The average sunshine in September is 9.2h.UV index
In September, the average daily maximum UV index in Granite Falls is 3. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for the average person.Note: In September, a daily maximum UV index of 3 leads to the following instructions:
Exercise prevention - Protecting skin and eyes from harm is required. Exposing oneself to the midday Sun can be harmful due to the strong UV radiation; limit your time outside. Enhance your sun protection with tightly woven, yet airy clothing.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in Granite Falls in September?
What is the average humidity in September in Granite Falls?
How much does it rain in Granite Falls in September?
When it does not snow in Granite Falls?
How many hours of daylight does Granite Falls have in September?
When are sunrise and sunset in September in Granite Falls?
How long on average sun shines in September in Granite Falls?
How high is the UV index in September in Granite Falls?
Average temperature in September
Granite Falls, WA
- Average high temperature in September: 67.1°F
The warmest month (with the highest average high temperature) is August (73°F).
The month with the lowest average high temperature is December (42.3°F).
- Average low temperature in September: 50°F
The month with the highest average low temperature is August (52.5°F).
The coldest month (with the lowest average low temperature) is December (34.7°F).
Average pressure in September
Granite Falls, WA
- Average pressure in September: 30.01"Hg
The month with the highest atmospheric pressure is January (30.09"Hg).
The month with the lowest atmospheric pressure is August (30"Hg).
Average wind speed in September
Granite Falls, WA
- Average wind speed in September: 4mph
The windiest months (with the highest average wind speed) are March and November (5.8mph).
The calmest month (with the lowest average wind speed) is August (3.5mph).
Average humidity in September
Granite Falls, WA
- Average humidity in September: 77%
The months with the highest relative humidity are January and December (85%).
The month with the lowest relative humidity is July (73%).
Average rainfall in September
Granite Falls, WA
- Average rainfall in September: 1.77"
The wettest month (with the highest rainfall) is November (4.06").
The driest month (with the least rainfall) is July (0.47").
Average rainfall days in September
Granite Falls, WA
- Average rainfall days in September: 12.3 days
The month with the highest number of rainy days is March (19.8 days).
The month with the least rainy days is August (6.1 days).
Average snowfall in September
Granite Falls, WA
- Average snowfall in September: 0"
The month with the highest snowfall is February (2.68").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Granite Falls, WA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (3.1 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
Granite Falls, 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 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
Granite Falls, WA
- Average sunshine days in September: 16.1 days
The month with the most sunshine days is August (23.1 days).
The months with the least sunshine days are February and November (8.6 days).
Average UV index in September
Granite Falls, WA
- Average UV index in September: 3
The months with the highest UV index are June and 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
Granite Falls, WA
- Average cloud cover in September: 34
The month with the most cloud cover is December (Cloud cover 57).
The month with the least cloud cover is August (Cloud cover 26).
Average visibility in September
Granite Falls, WA
- Average visibility in September: 6mi
The months with the highest visibility are March, April, May, June, July, August, September and October (6mi).
The months with the lowest visibility are January, February, November and December (5mi).
Granite Falls, Washington, USA
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