September weather forecastNorthport, WA
September
Weather in September
The first month of the autumn, September, is also an enjoyable month in Northport, Washington, with an average temperature varying between 40.1°F (4.5°C) and 67.1°F (19.5°C).Temperature
The start of September signals a decrease in the average high-temperature, transitioning from a moderately hot 78.4°F (25.8°C) in August to a comfortable 67.1°F (19.5°C). Despite the hot September days, Northport's nights see an average temperature plunge to a wintry 40.1°F (4.5°C).Humidity
The average relative humidity in September is 64%.Rainfall
In Northport, in September, it is raining for 7.1 days, with typically 0.51" (13mm) of accumulated precipitation. In Northport, during the entire year, the rain falls for 107 days and collects up to 9.45" (240mm) of precipitation.Snowfall
Months with snowfall are January through April, September through December. September is the first month it typically snows. Throughout September, in the average 0.1 snowfall days, it receives 0.08" (2mm) of snow. In Northport, during the entire year, snow falls for 42.6 days and aggregates up to 16.26" (413mm) of snow.Daylight
In September, the average length of the day is 12h and 34min.On the first day of the month, sunrise is at 6:09 am and sunset at 7:32 pm. On the last day of September, sunrise is at 6:50 am and sunset at 6:31 pm PDT.
Sunshine
In Northport, Washington, the average sunshine in September is 10.1h.UV index
The average daily maximum UV index in September is 3. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for average individuals.Note: A daily high UV index of 3 in September leads to these guidelines:
Be vigilant - A duty to shield skin and eyes from injury exists. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation. Warning! The reflection from snow can nearly magnify the Sun's UV radiation twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Northport, WA
- Average high temperature in September: 67.1°F
The warmest month (with the highest average high temperature) is August (78.4°F).
The month with the lowest average high temperature is December (27.1°F).
- Average low temperature in September: 40.1°F
The month with the highest average low temperature is August (46.6°F).
The coldest month (with the lowest average low temperature) is February (13.3°F).
Average pressure in September
Northport, WA
- Average pressure in September: 29.98"Hg
The month with the highest atmospheric pressure is January (30.19"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in September
Northport, WA
- Average wind speed in September: 3.3mph
The windiest month (with the highest average wind speed) is April (3.7mph).
The calmest months (with the lowest average wind speed) are January and December (3mph).
Average humidity in September
Northport, WA
- Average humidity in September: 64%
The month with the highest relative humidity is January (95%).
The month with the lowest relative humidity is August (54%).
Average rainfall in September
Northport, WA
- Average rainfall in September: 0.51"
The wettest month (with the highest rainfall) is May (1.18").
The driest month (with the least rainfall) is August (0.2").
Average rainfall days in September
Northport, WA
- Average rainfall days in September: 7.1 days
The month with the highest number of rainy days is April (13.6 days).
The month with the least rainy days is August (3.3 days).
Average snowfall in September
Northport, WA
- Average snowfall in September: 0.08"
The month with the highest snowfall is December (5.16").
The months with the least snowfall are May, June, July and August (0").
Average snowfall days in September
Northport, WA
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is December (11.5 days).
The months with the least snowfall days are May, June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Northport, WA
- Average daylight in September: 12h and 36min
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: 10h and 6min
The month with the most sunshine is August (Average sunshine: 12h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).
Average sunshine days in September
Northport, WA
- Average sunshine days in September: 21.6 days
The month with the most sunshine days is August (26.1 days).
The month with the least sunshine days is April (13.3 days).
Average UV index in September
Northport, WA
- Average UV index in September: 3
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 1).
Average cloud cover in September
Northport, WA
- Average cloud cover in September: 25
The month with the most cloud cover is January (Cloud cover 60).
The month with the least cloud cover is August (Cloud cover 14).
Average visibility in September
Northport, WA
- Average visibility in September: 6mi
The months with the highest visibility are May, June, July, August and September (6mi).
The months with the lowest visibility are January and February (2mi).
