September weather forecastDeadwood, OR
September
Weather in September
The first month of the autumn, September, is still a comfortable month in Deadwood, Oregon, with an average temperature fluctuating between 52.3°F (11.3°C) and 66.2°F (19°C).Temperature
September's average high-temperature stands at a refreshing 66.2°F (19°C), showing little deviation from August's 68.2°F (20.1°C). During the nights in September, an average low-temperature of 52.3°F (11.3°C) is observed.Humidity
April through July, September and October, with an average relative humidity of 81%, are the least humid months.Rainfall
In Deadwood, in September, during 6.8 rainfall days, 0.79" (20mm) of precipitation is typically accumulated. Throughout the year, there are 131.8 rainfall days, and 20.63" (524mm) of precipitation is accumulated.Snowfall
In Deadwood, snow does not fall in March through October and December.Daylight
In Deadwood, Oregon, the average length of the day in September is 12h and 29min.On the first day of September, sunrise is at 6:39 am and sunset at 7:50 pm. On the last day of the month, sunrise is at 7:12 am and sunset at 6:56 pm PDT.
Sunshine
In Deadwood, the average sunshine in September is 9.3h.UV index
In September, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for the ordinary person.Note: The UV index of 4 during September translates into the following guidance:
Act with care - Obligation to protect against skin and eye damage is highlighted. The solar radiation around mid-day is intense; avoid the Sun and stay safe. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Deadwood, OR
- Average high temperature in September: 66.2°F
The warmest month (with the highest average high temperature) is August (68.2°F).
The month with the lowest average high temperature is December (48°F).
- Average low temperature in September: 52.3°F
The month with the highest average low temperature is August (52.7°F).
The coldest month (with the lowest average low temperature) is February (40.6°F).
Average pressure in September
Deadwood, OR
- Average pressure in September: 30.01"Hg
The months with the highest atmospheric pressure are January and April (30.09"Hg).
The month with the lowest atmospheric pressure is September (30.01"Hg).
Average wind speed in September
Deadwood, OR
- Average wind speed in September: 6.7mph
The windiest month (with the highest average wind speed) is December (9.4mph).
The calmest month (with the lowest average wind speed) is August (6.5mph).
Average humidity in September
Deadwood, OR
- Average humidity in September: 81%
The month with the highest relative humidity is February (84%).
The months with the lowest relative humidity are April, May, June, July, September and October (81%).
Average rainfall in September
Deadwood, OR
- Average rainfall in September: 0.79"
The wettest month (with the highest rainfall) is December (3.58").
The driest month (with the least rainfall) is July (0.08").
Average rainfall days in September
Deadwood, OR
- Average rainfall days in September: 6.8 days
The month with the highest number of rainy days is March (16.9 days).
The month with the least rainy days is July (2.9 days).
Average snowfall in September
Deadwood, OR
- Average snowfall in September: 0"
The month with the highest snowfall is February (0.35").
The months with the least snowfall are March, April, May, June, July, August, September, October and December (0").
Average snowfall days in September
Deadwood, OR
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (0.5 days).
The months with the least snowfall days are March, April, May, June, July, August, September, October and December (0 days).
Average daylight in September /
Average sunshine in September
Deadwood, OR
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 8h and 54min).
- Average sunshine in September: 9h and 18min
The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is February (Average sunshine: 4h and 0min).
Average sunshine days in September
Deadwood, OR
- Average sunshine days in September: 21.8 days
The month with the most sunshine days is July (26.9 days).
The month with the least sunshine days is February (12.3 days).
Average UV index in September
Deadwood, OR
- Average UV index in September: 4
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are February, November and December (UV index 2).
Average cloud cover in September
Deadwood, OR
- Average cloud cover in September: 31
The month with the most cloud cover is February (Cloud cover 59).
The month with the least cloud cover is July (Cloud cover 28).
Average visibility in September
Deadwood, OR
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are July and August (5mi).
