September weather forecastSequim, WA
September
Weather in September
September signals the end of the peak summer period and welcomes the arrival of Fall in Sequim. With the average high temperature decreasing to 62.6°F (17°C), there's a slight nip in the air. September usually experiences a spell of late summer with clear skies and lower humidity. The change in season affects the color of trees, with leaves turning into shades of yellow, orange, and red. The nature trails in and around Sequim are a visual treat during this month.Temperature
September marks a gentle change in average high-temperature, declining from August's pleasant 68°F (20°C) to an enjoyable 62.6°F (17°C). An average nighttime temperature of 49.3°F (9.6°C) is recorded during September.Humidity
The average relative humidity in September in Sequim is 79%.Rainfall
In Sequim, during September, the rain falls for 12.9 days and regularly aggregates up to 1.54" (39mm) of precipitation. Throughout the year, in Sequim, there are 174.1 rainfall days, and 19.45" (494mm) of precipitation is accumulated.Snowfall
May through October are months without snowfall.Daylight
In Sequim, Washington, the average length of the day in September is 12h and 33min.On the first day of the month, sunrise is at 6:31 am and sunset at 7:52 pm. On the last day of September, in Sequim, sunrise is at 7:11 am and sunset at 6:52 pm PDT.
Sunshine
In September, the average sunshine is 9.4h.UV index
May through September, with an average maximum UV index of 4, are months with the highest UV index in Sequim. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for the average person.Note: The maximum UV index, 4 during September, leads to the following recommendations:
Preventative actions are necessary - The mandate to avoid skin and eye damage is in place. Considering the Sun's intensity during midday, it's wise to minimize direct exposure. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Sequim, WA
- Average high temperature in September: 62.6°F
The warmest month (with the highest average high temperature) is August (68°F).
The month with the lowest average high temperature is December (41.2°F).
- Average low temperature in September: 49.3°F
The month with the highest average low temperature is August (52.3°F).
The coldest month (with the lowest average low temperature) is February (34.3°F).
Average pressure in September
Sequim, WA
- Average pressure in September: 30.02"Hg
The month with the highest atmospheric pressure is January (30.07"Hg).
The month with the lowest atmospheric pressure is March (30"Hg).
Average wind speed in September
Sequim, WA
- Average wind speed in September: 3.7mph
The windiest month (with the highest average wind speed) is November (5.9mph).
The calmest months (with the lowest average wind speed) are August and September (3.7mph).
Average humidity in September
Sequim, WA
- Average humidity in September: 79%
The months with the highest relative humidity are January and February (85%).
The months with the lowest relative humidity are July and August (75%).
Average rainfall in September
Sequim, WA
- Average rainfall in September: 1.54"
The wettest month (with the highest rainfall) is January (2.56").
The driest month (with the least rainfall) is July (0.59").
Average rainfall days in September
Sequim, WA
- Average rainfall days in September: 12.9 days
The month with the highest number of rainy days is March (19.8 days).
The month with the least rainy days is August (6.8 days).
Average snowfall in September
Sequim, WA
- Average snowfall in September: 0"
The month with the highest snowfall is February (2.17").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Sequim, WA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (2.8 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
Sequim, WA
- Average daylight in September: 12h and 36min
The month with the longest days is June (Average daylight: 16h and 0min).
The month with the shortest days is December (Average daylight: 8h and 24min).
- Average sunshine in September: 9h and 24min
The month with the most sunshine is August (Average sunshine: 11h and 0min).
The month with the least sunshine is January (Average sunshine: 4h and 42min).
Average sunshine days in September
Sequim, WA
- Average sunshine days in September: 14.8 days
The month with the most sunshine days is August (21.4 days).
The month with the least sunshine days is March (8.9 days).
Average UV index in September
Sequim, WA
- Average UV index in September: 4
The months with the highest UV index are May, June, July, August and September (UV index 4).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in September
Sequim, WA
- Average cloud cover in September: 30
The month with the most cloud cover is February (Cloud cover 52).
The month with the least cloud cover is August (Cloud cover 21).
Average visibility in September
Sequim, 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).
