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 mild 59.9°F (15.5°C) in August to a cool 52.5°F (11.4°C). In the month of September, Napakiak's average low-temperature falls to a wintry 41.5°F (5.3°C).Humidity
The average relative humidity in September is 79%.Rainfall
In Napakiak, in September, it is raining for 15.5 days, with typically 1.85" (47mm) of accumulated precipitation. Throughout the year, there are 129.5 rainfall days, and 16.46" (418mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, September through December. September is the first month it typically snows. 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 7:43 am and sunset at 9:51 pm. On the last day of the month, sunrise is at 8:53 am and sunset at 8:21 pm AKDT.
Sunshine
In Napakiak, the average sunshine in September is 4.8h.UV index
The average daily maximum UV index in September is 2. A UV Index value of 2, and less, symbolizes a minimal health hazard from unsafe exposure to UV radiation for average individuals.Note: A maximum daily UV index of 2 during September morphs into the following directions:
While most people are not greatly affected by extended sun exposure, those with fair skin, babies, and children must always have protection. Direct exposure to the Sun's intense radiation around midday should be avoided for health reasons. During bright days, sunglasses that offer UVA and UVB defense are recommended. Be alert! Nearly double the UV rays from the Sun can be reflected by snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in September?
What is the average humidity in September?
How many days does it rain in September?
When does it start to snow?
How many hours of daylight does Napakiak have in September?
What time are sunrise and sunset in September in Napakiak?
How long on average sun shines in September?
How high is the UV index in September?
Average temperature in September
Napakiak, 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
Napakiak, 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
Napakiak, 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
Napakiak, 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
Napakiak, 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
Napakiak, 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
Napakiak, 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
Napakiak, 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
Napakiak, 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
Napakiak, 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
Napakiak, 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
Napakiak, 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
Napakiak, 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).
Napakiak, Alaska, USA
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