September weather forecastDiamond, OR
September
Weather in September
The first month of the autumn, September, is also an agreeable month in Diamond, Oregon, with an average temperature fluctuating between 72.5°F (22.5°C) and 52°F (11.1°C).Temperature
September's arrival corresponds with a decrease in average high-temperatures, from August's moderately hot 81.5°F (27.5°C) to a pleasant 72.5°F (22.5°C). Diamond's nights in September experience an average temperature drop to a fresh 52°F (11.1°C).Humidity
The average relative humidity in September is 38%.Rainfall
In Diamond, in September, during 4.6 rainfall days, 0.39" (10mm) of precipitation is typically accumulated. Throughout the year, there are 75.2 rainfall days, and 5.63" (143mm) of precipitation is accumulated.Snowfall
In Diamond, snow does not fall in June through September.Daylight
In September, the average length of the day is 12h and 29min.On the first day of the month, sunrise is at 6:20 am and sunset at 7:28 pm. On the last day of September, sunrise is at 6:51 am and sunset at 6:36 pm PDT.
Sunshine
In September, the average sunshine in Diamond is 10.7h.UV index
In September, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for average individuals.Note: The UV index of 4 during September leads to these advisories:
Exercise prevention - Protecting skin and eyes from harm is required. UV radiation from the Sun is most dangerous during midday; take precautions and seek shade. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Diamond, OR
- Average high temperature in September: 72.5°F
The warmest month (with the highest average high temperature) is July (82.9°F).
The month with the lowest average high temperature is December (33.3°F).
- Average low temperature in September: 52°F
The month with the highest average low temperature is August (59°F).
The coldest month (with the lowest average low temperature) is December (22.5°F).
Average pressure in September
Diamond, OR
- Average pressure in September: 29.96"Hg
The month with the highest atmospheric pressure is January (30.23"Hg).
The months with the lowest atmospheric pressure are June and August (29.93"Hg).
Average wind speed in September
Diamond, OR
- Average wind speed in September: 6.9mph
The windiest month (with the highest average wind speed) is March (9.4mph).
The calmest month (with the lowest average wind speed) is August (6.5mph).
Average humidity in September
Diamond, OR
- Average humidity in September: 38%
The month with the highest relative humidity is December (81%).
The months with the lowest relative humidity are July and August (33%).
Average rainfall in September
Diamond, OR
- Average rainfall in September: 0.39"
The wettest months (with the highest rainfall) are April and May (0.67").
The driest month (with the least rainfall) is July (0.2").
Average rainfall days in September
Diamond, OR
- Average rainfall days in September: 4.6 days
The month with the highest number of rainy days is April (9.6 days).
The month with the least rainy days is July (4 days).
Average snowfall in September
Diamond, OR
- Average snowfall in September: 0"
The month with the highest snowfall is December (2.72").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Diamond, OR
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is December (9 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Diamond, OR
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in September: 10h and 42min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 30min).
Average sunshine days in September
Diamond, OR
- Average sunshine days in September: 23.1 days
The month with the most sunshine days is July (24.3 days).
The month with the least sunshine days is March (17.8 days).
Average UV index in September
Diamond, OR
- Average UV index in September: 4
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in September
Diamond, OR
- Average cloud cover in September: 14
The month with the most cloud cover is December (Cloud cover 42).
The month with the least cloud cover is July (Cloud cover 8).
Average visibility in September
Diamond, OR
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
