September weather forecastCoos Bay, OR
September
Weather in September
September brings Coos Bay into the comfortable clasp of autumn. Compared to the peak summer months, rainfall escalates a little to 1.1" (28mm), offering relief from the intense dryness. The wind carries whispers of the approaching change, gathering momentum. The shrinking daylight hours are coupled with thicker cloud cover, adding a cooling respite. September marks a moderate shift in the weather of Coos Bay, replacing the heat of summer with milder autumn breezes.Temperature
In September, Coos Bay's weather conditions record an average high-temperature of a still refreshing 65.8°F (18.8°C), demonstrating little divergence from the preceding month. Coos Bay experiences an average nighttime temperature of 51.6°F (10.9°C) in the month of September.Humidity
In Coos Bay, the average relative humidity in September is 82%.Rainfall
In Coos Bay, in September, during 7.1 rainfall days, 1.1" (28mm) of precipitation is typically accumulated. Throughout the year, there are 153 rainfall days, and 33.5" (851mm) of precipitation is accumulated.Snowfall
March through October and December are months without snowfall.Daylight
In Coos Bay, the average length of the day in September is 12h and 29min.On the first day of the month, sunrise is at 6:41 am and sunset at 7:51 pm. On the last day of September, sunrise is at 7:14 am and sunset at 6:59 pm PDT.
Sunshine
In Coos Bay, the average sunshine in September is 9.6h.UV index
In September, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for the ordinary person.Note: A maximum UV index of 4 in September translates into the following recommendations:
Act with care - The suggestion to avoid sunburn is emphasized. Direct Sun exposure should be minimized especially during midday when radiation is most intense. A hat with a broad brim is indispensable, filtering out up to half of UV rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Coos Bay, OR
- Average high temperature in September: 65.8°F
The warmest month (with the highest average high temperature) is August (66.9°F).
The month with the lowest average high temperature is December (49.1°F).
- Average low temperature in September: 51.6°F
The month with the highest average low temperature is August (52.3°F).
The coldest months (with the lowest average low temperature) are February and December (41.7°F).
Average pressure in September
Coos Bay, 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
Coos Bay, OR
- Average wind speed in September: 7.1mph
The windiest month (with the highest average wind speed) is March (9.1mph).
The calmest month (with the lowest average wind speed) is August (6.9mph).
Average humidity in September
Coos Bay, OR
- Average humidity in September: 82%
The months with the highest relative humidity are February and August (84%).
The months with the lowest relative humidity are April and October (81%).
Average rainfall in September
Coos Bay, OR
- Average rainfall in September: 1.1"
The wettest month (with the highest rainfall) is December (5.87").
The driest month (with the least rainfall) is July (0.16").
Average rainfall days in September
Coos Bay, OR
- Average rainfall days in September: 7.1 days
The month with the highest number of rainy days is March (19.2 days).
The month with the least rainy days is August (3.5 days).
Average snowfall in September
Coos Bay, OR
- Average snowfall in September: 0"
The month with the highest snowfall is February (0.2").
The months with the least snowfall are March, April, May, June, July, August, September, October and December (0").
Average snowfall days in September
Coos Bay, OR
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (0.3 days).
The months with the least snowfall days are March, April, May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Coos Bay, 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: 9h and 0min).
- Average sunshine in September: 9h and 36min
The month with the most sunshine is July (Average sunshine: 10h and 48min).
The months with the least sunshine are January and February (Average sunshine: 4h and 24min).
Average sunshine days in September
Coos Bay, OR
- Average sunshine days in September: 21.6 days
The month with the most sunshine days is July (25.7 days).
The month with the least sunshine days is February (9.7 days).
Average UV index in September
Coos Bay, 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 and December (UV index 2).
Average cloud cover in September
Coos Bay, OR
- Average cloud cover in September: 28
The month with the most cloud cover is February (Cloud cover 56).
The months with the least cloud cover are July and September (Cloud cover 28).
Average visibility in September
Coos Bay, 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).
