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 sea temperature 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 introduction of September sees an average high-temperature of a comfortable 65.1°F (18.4°C), hardly deviating from August. September is noted for a mean low-temperature of 50.7°F (10.4°C).Humidity
The average relative humidity in September in Bellingham is 79%.Rainfall
In Bellingham, during September, the rain falls for 12.3 days and regularly aggregates up to 1.57" (40mm) of precipitation. Throughout the year, there are 158 rainfall days, and 18.7" (475mm) of precipitation is accumulated.Snowfall
In Bellingham, snow does not fall in May through October.Ocean temperature
In Bellingham, the average seawater temperature in September is 52.9°F (11.6°C).Note: Engaging in a swim in 52.9°F (11.6°C) can threaten life. Brief exposure to 55.4°F (13°C) waters is uneasy, and submersion below 50°F (10°C) can lead to cold shock and disrupted breathing patterns, varying by individual.
Daylight
In Bellingham, Washington, the average length of the day in September is 12h and 34min.On the first day of September in Bellingham, sunrise is at 6:28 am and sunset at 7:51 pm. On the last day of the month, sunrise is at 7:09 am and sunset at 6:50 pm PDT.
Sunshine
In Bellingham, the average sunshine in September is 9.3h.UV index
The average daily maximum UV index in September in Bellingham is 3. A UV Index reading of 3 to 5 represents a medium health hazard from unsafe exposure to UV radiation for ordinary individuals.Note: The maximum daily UV index, 3 in September, converts into the following recommendations:
Make use of precautions - Shielding skin and eyes from injury is a requirement. Solar radiation peaks around mid-day, so it's wise to limit exposure to the Sun at this time. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in Bellingham in September?
What is the average humidity in September in Bellingham?
How many days does it rain in September in Bellingham?
When it does not snow in Bellingham?
What is the water temperature in September in Bellingham?
How many hours of daylight does Bellingham have in September?
When are sunrise and sunset in September in Bellingham?
How long on average sun shines in September in Bellingham?
How high is the UV index in September in Bellingham?
Average temperature in September
Bellingham, WA
- Average high temperature in September: 65.1°F
The warmest months (with the highest average high temperature) are July and August (70.3°F).
The month with the lowest average high temperature is December (41.9°F).
- Average low temperature in September: 50.7°F
The month with the highest average low temperature is August (53.2°F).
The coldest month (with the lowest average low temperature) is December (34.9°F).
Average pressure in September
Bellingham, WA
- Average pressure in September: 30.01"Hg
The month with the highest atmospheric pressure is January (30.08"Hg).
The month with the lowest atmospheric pressure is March (30"Hg).
Average wind speed in September
Bellingham, WA
- Average wind speed in September: 4mph
The windiest month (with the highest average wind speed) is November (6.2mph).
The calmest month (with the lowest average wind speed) is August (3.7mph).
Average humidity in September
Bellingham, WA
- Average humidity in September: 79%
The month with the highest relative humidity is January (84%).
The month with the lowest relative humidity is July (74%).
Average rainfall in September
Bellingham, WA
- Average rainfall in September: 1.57"
The wettest month (with the highest rainfall) is November (2.64").
The driest month (with the least rainfall) is July (0.55").
Average rainfall days in September
Bellingham, WA
- Average rainfall days in September: 12.3 days
The month with the highest number of rainy days is March (17.3 days).
The month with the least rainy days is August (7.1 days).
Average snowfall in September
Bellingham, WA
- Average snowfall in September: 0"
The month with the highest snowfall is February (1.81").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Bellingham, WA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (3.4 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average sea temperature in September
Bellingham, WA
- Average sea temperature in September: 52.9°F
The best month for swimming (with the highest average sea temperature) is August (53.2°F).
The coldest month (with the lowest average sea temperature) is February (44.5°F).
Average daylight in September /
Average sunshine in September
Bellingham, WA
- Average daylight in September: 12h and 4min
The month with the longest days is June (Average daylight: 16h and 6min).
The month with the shortest days is December (Average daylight: 8h and 18min).
- Average sunshine in September: 9h and 2min
The months with the most sunshine are July and August (Average sunshine: 10h and 30min).
The months with the least sunshine are January and December (Average sunshine: 4h and 12min).
Average sunshine days in September
Bellingham, WA
- Average sunshine days in September: 16.1 days
The month with the most sunshine days is July (22.3 days).
The month with the least sunshine days is April (10.8 days).
Average UV index in September
Bellingham, WA
- Average UV index in September: 3
The month with the highest UV index is 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
Bellingham, WA
- Average cloud cover in September: 33
The months with the most cloud cover are January and December (Cloud cover 56).
The month with the least cloud cover is August (Cloud cover 25).
Average visibility in September
Bellingham, WA
- 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).
Bellingham, Washington, USA
Weather forecast for your location
2. Allow the app to use your location