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 move into September indicates a slight reduction in the average high-temperature, down from August's mild 59.9°F (15.5°C) to a cool 52.5°F (11.4°C). During the month of September, an average temperature of 41.5°F (5.3°C) is noted during the nights.Humidity
In September, the average relative humidity is 79%.Rainfall
In September, the rain falls for 15.5 days. Throughout September, 1.85" (47mm) of precipitation is accumulated. In Napaskiak, during the entire year, the rain falls for 129.5 days and collects up to 16.46" (418mm) of precipitation.Snowfall
January through May, September through December are months with snowfall. September is the first month it typically snows in Napaskiak. Throughout September, in the average 0.7 snowfall days, it receives 0.04" (1mm) of snow. Throughout the year, there are 74.8 snowfall days, and 22.91" (582mm) of snow is accumulated.Daylight
The average length of the day in September is 12h and 50min.On the first day of September, sunrise is at 7:42 am and sunset at 9:50 pm. On the last day of the month, sunrise is at 8:53 am and sunset at 8:20 pm AKDT.
Sunshine
The average sunshine in September is 4.8h.UV index
In Napaskiak, the average daily maximum UV index in September is 2. A UV Index of 2, and less, symbolizes a minimal health hazard from unsafe exposure to UV radiation for ordinary individuals.Note: In September, a regular UV index of 2 translates into these guidelines:
Despite most people tolerating extended sun exposure, it is critical to always protect those with sensitive skin, infants, and children. UV radiation from the Sun is most dangerous during midday; take precautions and seek shade. Stay sun-safe with clothing that is both closely woven and worn loosely. Keep in mind! Snow's reflective quality can nearly double the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Napaskiak in September?
What is the average humidity in September?
How much does it rain in Napaskiak in September?
When does it start snowing?
How many hours of daylight does Napaskiak have in September?
When is the sunrise / sunset in September?
How long on average sun shines in September?
How high is the UV index in September?
Average temperature in September
Napaskiak, AK
- Average high temperature in September: 52.5°F
The warmest month (with the highest average high temperature) is July (62.4°F).
The month with the lowest average high temperature is January (12.2°F).
- Average low temperature in September: 41.5°F
The month with the highest average low temperature is July (49.6°F).
The coldest month (with the lowest average low temperature) is January (3.7°F).
Average pressure in September
Napaskiak, AK
- Average pressure in September: 29.72"Hg
The month with the highest atmospheric pressure is July (29.92"Hg).
The month with the lowest atmospheric pressure is December (29.64"Hg).
Average wind speed in September
Napaskiak, AK
- Average wind speed in September: 9.9mph
The windiest month (with the highest average wind speed) is January (12.7mph).
The calmest month (with the lowest average wind speed) is July (8.5mph).
Average humidity in September
Napaskiak, AK
- Average humidity in September: 79%
The months with the highest relative humidity are January, February and March (91%).
The month with the lowest relative humidity is June (65%).
Average rainfall in September
Napaskiak, AK
- Average rainfall in September: 1.85"
The wettest month (with the highest rainfall) is August (2.09").
The driest months (with the least rainfall) are January and April (0.91").
Average rainfall days in September
Napaskiak, AK
- Average rainfall days in September: 15.5 days
The month with the highest number of rainy days is August (19.7 days).
The month with the least rainy days is March (4.4 days).
Average snowfall in September
Napaskiak, AK
- Average snowfall in September: 0.04"
The month with the highest snowfall is February (4.96").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Napaskiak, AK
- Average snowfall days in September: 0.7 days
The month with the highest number of snowfall days is December (12.8 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Napaskiak, AK
- Average daylight in September: 12h and 5min
The month with the longest days is June (Average daylight: 19h and 0min).
The month with the shortest days is December (Average daylight: 5h and 48min).
- Average sunshine in September: 4h and 5min
The month with the most sunshine is May (Average sunshine: 8h and 6min).
The month with the least sunshine is December (Average sunshine: 2h and 42min).
Average sunshine days in September
Napaskiak, AK
- Average sunshine days in September: 12.3 days
The month with the most sunshine days is March (17.5 days).
The month with the least sunshine days is August (8.6 days).
Average UV index in September
Napaskiak, AK
- Average UV index in September: 2
The months with the highest UV index are May, June, July and August (UV index 3).
The months with the lowest UV index are February, March and December (UV index 1).
Average cloud cover in September
Napaskiak, AK
- Average cloud cover in September: 62
The months with the most cloud cover are July and August (Cloud cover 67).
The month with the least cloud cover is June (Cloud cover 54).
Average visibility in September
Napaskiak, AK
- Average visibility in September: 6mi
The months with the highest visibility are May, June, July, August, September, October and December (6mi).
The months with the lowest visibility are January, February, March, April and November (5mi).
Napaskiak, Alaska, USA
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