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
The shift from August to September includes a small decrease in the average high-temperature, from a moderately hot 75.4°F (24.1°C) to an agreeable 69.3°F (20.7°C). During the nights in September, Rollingbay experiences a consistent average temperature of 52.2°F (11.2°C).Humidity
In September, the average relative humidity in Rollingbay is 75%.Rainfall
In Rollingbay, in September, during 11.3 rainfall days, 1.14" (29mm) of precipitation is typically accumulated. Throughout the year, there are 172.2 rainfall days, and 23.7" (602mm) of precipitation is accumulated.Snowfall
April through October are months without snowfall.Daylight
The average length of the day in September is 12h and 33min.On the first day of the month, sunrise is at 6:29 am and sunset at 7:49 pm. On the last day of September, sunrise is at 7:08 am and sunset at 6:50 pm PDT.
Sunshine
The average sunshine in September is 9.3h.UV index
The average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a moderate health risk from unprotected exposure to Sun's UV rays for average individuals.Note: In September, a daily maximum UV index of 4 leads to the following instructions:
Exercise prevention - Precautions against solar damage are endorsed. The Sun's radiation is especially intense around midday; try to stay in shade during this period. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
Frequently asked questions
What are the temperatures in Rollingbay in September?
What is the average humidity in September in Rollingbay?
How much does it rain in Rollingbay in September?
When it does not snow in Rollingbay?
What is the average length of the day in September in Rollingbay?
When is the sunrise / sunset in September in Rollingbay?
How long on average sun shines in September in Rollingbay?
How high is the UV index in September in Rollingbay?
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 3min
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 2min
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).
Rollingbay, Washington, USA
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