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 arrival of September, Grand Ronde experiences a modest decline in average high-temperatures, transitioning from a warm 78.4°F (25.8°C) in August to a pleasant 71.1°F (21.7°C). In September, the temperature in Grand Ronde, Oregon, registers a significant dip to an average of 48.7°F (9.3°C) at night.Humidity
In September, the average relative humidity in Grand Ronde is 76%.Rainfall
In Grand Ronde, during September, the rain falls for 9.5 days and regularly aggregates up to 0.67" (17mm) of precipitation. Throughout the year, there are 156 rainfall days, and 15.94" (405mm) of precipitation is accumulated.Snowfall
In Grand Ronde, snow does not fall in April through October.Daylight
In Grand Ronde, the average length of the day in September is 12h and 31min.On the first day of September in Grand Ronde, Oregon, 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
In Grand Ronde, the average sunshine in September is 8.7h.UV index
In September, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for ordinary individuals.Note: A daily maximum UV index of 4 in September translates into the following instructions:
Adopt protective measures - Requirement to safeguard skin and eyes from harm exists. Direct exposure to the Sun's intense radiation around midday should be avoided for health reasons. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly.
Frequently asked questions
What is the temperature in September in Grand Ronde?
What is the average humidity in September in Grand Ronde?
How many days does it rain in September in Grand Ronde?
When it does not snow in Grand Ronde?
How many hours of daylight does Grand Ronde have in September?
What time are sunrise and sunset in September in Grand Ronde?
How long on average sun shines in September in Grand Ronde?
What is the UV index reading in September in Grand Ronde?
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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