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 onset of September results in a decrease in the average high-temperature, receding from a tropical 86.2°F (30.1°C) in August to a warm 75.4°F (24.1°C). The average nighttime temperature lowers to a fresh 54.3°F (12.4°C) throughout September.Humidity
The average relative humidity in September is 46%.Rainfall
In Nass, during September, the rain falls for 4.8 days and regularly aggregates up to 0.16" (4mm) of precipitation. Throughout the year, in Nass, there are 78 rainfall days, and 3.39" (86mm) of precipitation is accumulated.Snowfall
Months with snowfall in Nass, Washington, are January through March, September, November and December. September is the first month it typically snows. Throughout September, in the average 0.1 snowfall days, it receives 0.04" (1mm) of snow. Throughout the year, in Nass, there are 14.9 snowfall days, and 3.11" (79mm) of snow is accumulated.Daylight
The average length of the day in September in Nass is 12h and 32min.On the first day of the month, sunrise is at 6:22 am and sunset at 7:38 pm. On the last day of September, in Nass, sunrise is at 6:58 am and sunset at 6:41 pm PDT.
Sunshine
In Nass, the average sunshine in September is 11h.UV index
In Nass, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a moderate health risk from unsafe exposure to UV radiation for average individuals.Note: The daily high UV index of 4 in September translates into this advice:
Take necessary precautions - Defending against sun damage is advocated. UV radiation is strongest from the Sun during midday; protect yourself by staying in shaded areas. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage. Be vigilant! The reflective nature of snow can increase the Sun's UV radiation nearly twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures in Nass?
What is the average humidity in September in Nass?
How many days does it rain in September in Nass?
When does it start snowing in Nass?
How many hours of daylight does Nass have in September?
When is the sunrise / sunset in September in Nass?
How long on average sun shines in September in Nass?
What is the UV index reading in September in Nass?
Average temperature in September
Nass, WA
- Average high temperature in September: 75.4°F
The warmest month (with the highest average high temperature) is July (86.9°F).
The month with the lowest average high temperature is December (36.5°F).
- Average low temperature in September: 54.3°F
The month with the highest average low temperature is August (60.8°F).
The coldest month (with the lowest average low temperature) is December (25.5°F).
Average pressure in September
Nass, WA
- Average pressure in September: 29.96"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is August (29.92"Hg).
Average wind speed in September
Nass, WA
- Average wind speed in September: 6.4mph
The windiest month (with the highest average wind speed) is April (7.9mph).
The calmest month (with the lowest average wind speed) is December (4.8mph).
Average humidity in September
Nass, WA
- Average humidity in September: 46%
The month with the highest relative humidity is January (82%).
The month with the lowest relative humidity is July (38%).
Average rainfall in September
Nass, WA
- Average rainfall in September: 0.16"
The wettest month (with the highest rainfall) is May (0.63").
The driest month (with the least rainfall) is July (0.08").
Average rainfall days in September
Nass, WA
- Average rainfall days in September: 4.8 days
The month with the highest number of rainy days is March (9.9 days).
The months with the least rainy days are July and August (2.8 days).
Average snowfall in September
Nass, WA
- Average snowfall in September: 0.04"
The months with the highest snowfall are January, February and December (0.94").
The months with the least snowfall are April, May, June, July, August and October (0").
Average snowfall days in September
Nass, WA
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is December (4.7 days).
The months with the least snowfall days are April, May, June, July, August and October (0 days).
Average daylight in September /
Average sunshine in September
Nass, WA
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in September: 11h and 0min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is January (Average sunshine: 5h and 18min).
Average sunshine days in September
Nass, WA
- Average sunshine days in September: 22.7 days
The month with the most sunshine days is July (26.6 days).
The month with the least sunshine days is March (17.3 days).
Average UV index in September
Nass, WA
- Average UV index in September: 4
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Nass, WA
- Average cloud cover in September: 16
The month with the most cloud cover is January (Cloud cover 45).
The month with the least cloud cover is July (Cloud cover 9).
Average visibility in September
Nass, 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).
Nass, Washington, USA
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