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 beginning of September brings a slight decrease in the average high-temperature, transitioning from a pleasant 71.1°F (21.7°C) in August to a refreshing 65.3°F (18.5°C). September's nights observe an average temperature of 50.9°F (10.5°C).Humidity
The average relative humidity in September in Lummi Island is 79%.Rainfall
In September, the rain falls for 13.4 days. Throughout September, 2.52" (64mm) of precipitation is accumulated. Throughout the year, there are 178.6 rainfall days, and 37.32" (948mm) of precipitation is accumulated.Snowfall
May through October are months without snowfall.Daylight
In Lummi Island, Washington, the average length of the day in September is 12h and 34min.On the first day of September, sunrise is at 6:29 am and sunset at 7:51 pm. On the last day of the month, sunrise is at 7:10 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 Lummi Island is 4. A UV Index reading of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for the ordinary person.Note: The UV index of 4 during September leads to these advisories:
Be vigilant - A duty to shield skin and eyes from injury exists. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance.
Frequently asked questions
What are September temperatures in Lummi Island?
What is the average humidity in September in Lummi Island?
How many days does it rain in September in Lummi Island?
When it does not snow in Lummi Island?
How many hours of daylight does Lummi Island have in September?
When is the sunrise / sunset in September in Lummi Island?
How many hours of sunshine does Lummi Island have in September?
How high is the UV index in September in Lummi Island?
Average temperature in September
Lummi Island, WA
- Average high temperature in September: 65.3°F
The warmest month (with the highest average high temperature) is August (71.1°F).
The month with the lowest average high temperature is December (41.9°F).
- Average low temperature in September: 50.9°F
The month with the highest average low temperature is August (53.8°F).
The coldest month (with the lowest average low temperature) is February (35.2°F).
Average pressure in September
Lummi Island, 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
Lummi Island, WA
- Average wind speed in September: 3.9mph
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
Lummi Island, 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
Lummi Island, WA
- Average rainfall in September: 2.52"
The wettest month (with the highest rainfall) is November (5.71").
The driest month (with the least rainfall) is July (0.67").
Average rainfall days in September
Lummi Island, WA
- Average rainfall days in September: 13.4 days
The month with the highest number of rainy days is November (20.1 days).
The month with the least rainy days is August (7.3 days).
Average snowfall in September
Lummi Island, WA
- Average snowfall in September: 0"
The month with the highest snowfall is February (2.56").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Lummi Island, WA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (3.8 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
Lummi Island, 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 24min).
- 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
Lummi Island, WA
- Average sunshine days in September: 15.3 days
The month with the most sunshine days is August (21.9 days).
The month with the least sunshine days is November (8.5 days).
Average UV index in September
Lummi Island, 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
Lummi Island, 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
Lummi Island, WA
- Average visibility in September: 6mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
Lummi Island, Washington, USA
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