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 minor change in the average high-temperature, shifting from a warm 78.4°F (25.8°C) in August to an agreeable 71.1°F (21.7°C). During the nights in September, Grand Ronde records a pronounced shift from the daytime warmth, with a consistent average temperature of 48.7°F (9.3°C).Humidity
The average relative humidity in September is 76%.Rainfall
In Grand Ronde, in September, during 9.5 rainfall days, 0.67" (17mm) of precipitation is typically accumulated. In Grand Ronde, during the entire year, the rain falls for 156 days and collects up to 15.94" (405mm) of precipitation.Snowfall
April through October are months without snowfall.Daylight
The average length of the day in September is 12h and 31min.On the first day of September, sunrise is at 6:37 am and sunset at 7:50 pm. On the last day of the month, sunrise is at 7:12 am and sunset at 6:55 pm PDT.
Sunshine
The average sunshine in September in Grand Ronde is 8.7h.UV index
In September, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a medium vulnerability from unsafe exposure to UV radiation for the ordinary person.Note: The average daily UV index of 4 in September transforms into the following instructions:
Be vigilant - Preventing sunburn is recommended. The Sun's UV radiation is especially harmful around midday, so reduce exposure and stay safe. Opt for tightly woven and loose clothing to enhance protection from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average September temperature?
What is the average humidity in September?
How many days does it rain in September in Grand Ronde?
When it does not snow?
How many hours of daylight does Grand Ronde have in September?
When are sunrise and sunset in September?
How many hours of sunshine does Grand Ronde have in September?
How high is the UV index in September?
Average temperature in September
Grand Ronde, OR
- Average high temperature in September: 71.1°F
The warmest month (with the highest average high temperature) is August (78.4°F).
The month with the lowest average high temperature is December (43.5°F).
- Average low temperature in September: 48.7°F
The month with the highest average low temperature is August (52.3°F).
The coldest month (with the lowest average low temperature) is December (33.3°F).
Average pressure in September
Grand Ronde, OR
- Average pressure in September: 30.01"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is September (30.01"Hg).
Average wind speed in September
Grand Ronde, OR
- Average wind speed in September: 3.9mph
The windiest month (with the highest average wind speed) is March (5mph).
The calmest month (with the lowest average wind speed) is August (3.8mph).
Average humidity in September
Grand Ronde, OR
- Average humidity in September: 76%
The months with the highest relative humidity are February and December (89%).
The month with the lowest relative humidity is August (71%).
Average rainfall in September
Grand Ronde, OR
- Average rainfall in September: 0.67"
The wettest month (with the highest rainfall) is December (2.56").
The driest month (with the least rainfall) is July (0.24").
Average rainfall days in September
Grand Ronde, OR
- Average rainfall days in September: 9.5 days
The month with the highest number of rainy days is March (18.9 days).
The month with the least rainy days is August (4.8 days).
Average snowfall in September
Grand Ronde, OR
- Average snowfall in September: 0"
The month with the highest snowfall is February (0.94").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Grand Ronde, OR
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (2.3 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
Grand Ronde, OR
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).
- Average sunshine in September: 8h and 4min
The month with the most sunshine is August (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 3h and 24min).
Average sunshine days in September
Grand Ronde, OR
- Average sunshine days in September: 18 days
The month with the most sunshine days is July (23.7 days).
The month with the least sunshine days is February (9.3 days).
Average UV index in September
Grand Ronde, OR
- Average UV index in September: 4
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
Grand Ronde, OR
- Average cloud cover in September: 39
The month with the most cloud cover is February (Cloud cover 67).
The month with the least cloud cover is August (Cloud cover 29).
Average visibility in September
Grand Ronde, OR
- Average visibility in September: 5mi
The months with the highest visibility are June, July, August and September (5mi).
The months with the lowest visibility are January, February, March, April, May, October, November and December (4mi).
Grand Ronde, Oregon, USA
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