September weather forecastRollingbay, WA
September
Weather in September
The first month of the autumn, September, is still a pleasant month in Rollingbay, Washington, with an average temperature ranging between max 69.3°F (20.7°C) and min 52.2°F (11.2°C).Temperature
The commencement of September includes a gentle temperature shift, with the average high-temperature dropping a bit from a warm 75.4°F (24.1°C) in August to a pleasant 69.3°F (20.7°C). In September, Rollingbay records an average nighttime temperature of 52.2°F (11.2°C).Humidity
The average relative humidity in September in Rollingbay is 75%.Rainfall
In Rollingbay, during September, the rain falls for 11.3 days and regularly aggregates up to 1.14" (29mm) of precipitation. In Rollingbay, Washington, during the entire year, the rain falls for 172.2 days and collects up to 23.7" (602mm) of precipitation.Snowfall
In Rollingbay, snow does not fall in April through October.Daylight
In Rollingbay, the average length of the day in September is 12h and 33min.On the first day of September, sunrise is at 6:29 am and sunset at 7:49 pm. On the last day of the month, sunrise is at 7:08 am and sunset at 6:50 pm PDT.
Sunshine
The average sunshine in September is 9.3h.UV index
In September, the average daily maximum UV index in Rollingbay is 4. A UV Index value of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.Note: A daily maximum UV index of 4 in September translates into the following instructions:
Put precautions into practice - Guidance to elude sunburn is provided. Direct exposure to the Sun's intense radiation around midday should be avoided for health reasons. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Rollingbay, WA
- Average high temperature in September: 69.3°F
The warmest month (with the highest average high temperature) is August (75.4°F).
The month with the lowest average high temperature is December (43.5°F).
- Average low temperature in September: 52.2°F
The month with the highest average low temperature is August (55°F).
The coldest month (with the lowest average low temperature) is December (36.3°F).
Average pressure in September
Rollingbay, WA
- Average pressure in September: 30.01"Hg
The month with the highest atmospheric pressure is January (30.09"Hg).
The months with the lowest atmospheric pressure are March, August and September (30.01"Hg).
Average wind speed in September
Rollingbay, WA
- Average wind speed in September: 4.3mph
The windiest month (with the highest average wind speed) is March (6.1mph).
The calmest months (with the lowest average wind speed) are July and August (3.7mph).
Average humidity in September
Rollingbay, WA
- Average humidity in September: 75%
The months with the highest relative humidity are January and December (85%).
The months with the lowest relative humidity are July and August (71%).
Average rainfall in September
Rollingbay, WA
- Average rainfall in September: 1.14"
The wettest month (with the highest rainfall) is December (3.58").
The driest month (with the least rainfall) is July (0.35").
Average rainfall days in September
Rollingbay, WA
- Average rainfall days in September: 11.3 days
The month with the highest number of rainy days is March (19.9 days).
The month with the least rainy days is August (5.9 days).
Average snowfall in September
Rollingbay, WA
- Average snowfall in September: 0"
The month with the highest snowfall is February (2.32").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Rollingbay, WA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (3.1 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
Rollingbay, WA
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 30min).
- Average sunshine in September: 9h and 18min
The month with the most sunshine is August (Average sunshine: 10h and 36min).
The month with the least sunshine is December (Average sunshine: 4h and 18min).
Average sunshine days in September
Rollingbay, WA
- Average sunshine days in September: 17 days
The month with the most sunshine days is August (22.9 days).
The month with the least sunshine days is November (9.2 days).
Average UV index in September
Rollingbay, WA
- 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
Rollingbay, WA
- Average cloud cover in September: 33
The month with the most cloud cover is December (Cloud cover 55).
The month with the least cloud cover is August (Cloud cover 26).
Average visibility in September
Rollingbay, WA
- Average visibility in September: 6mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January and December (5mi).
