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 sea temperature 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 start of September involves a subtle temperature drop, shifting from a cool 54.1°F (12.3°C) in August to a chilly 48.2°F (9°C). In Juneau, September's low temperatures hover around a wintry 39.7°F (4.3°C), reflecting a minor decrease from the daytime highs.Humidity
In Juneau, the average relative humidity in September is 90%.Rainfall
In Juneau, Alaska, in September, during 21.9 rainfall days, 8.27" (210mm) of precipitation is typically accumulated. In Juneau, during the entire year, the rain falls for 172.4 days and collects up to 85.87" (2181mm) of precipitation.Snowfall
June through September are months without snowfall.Ocean temperature
In Juneau, the average seawater temperature in September is 50.9°F (10.5°C).Note: It is life-risking to swim in 50.9°F (10.5°C). Briefly staying in 55.4°F (13°C) waters feels unsettling, and temperatures below 50°F (10°C) might result in cold shock and loss of breath control, hinging on personal endurance.
Daylight
In Juneau, the average length of the day in September is 12h and 46min.On the first day of September, sunrise is at 5:59 am and sunset at 7:55 pm. On the last day of the month, sunrise is at 7:01 am and sunset at 6:32 pm AKDT.
Sunshine
In September, the average sunshine is 4.9h.UV index
In September, the average daily maximum UV index is 2. A UV Index reading of 2, and below, represents a minimal health hazard from exposure to the Sun's UV radiation for ordinary individuals.Note: In September, a regular UV index of 2 translates into these guidelines:
The majority are not significantly affected by prolonged sun exposure. Infants, children, and those with fair skin must always have protection. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage.
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 it does not snow?
Does it snow in September?
What is the water temperature in September?
How many hours of daylight does Juneau have in September?
When is the sunrise / sunset in September?
How many hours of sunshine does Juneau have in September?
What is the UV index reading in September?
Average temperature in September
Juneau, AK
- Average high temperature in September: 48.2°F
The warmest month (with the highest average high temperature) is July (55.8°F).
The months with the lowest average high temperature are January and December (25.7°F).
- Average low temperature in September: 39.7°F
The month with the highest average low temperature is July (45.1°F).
The coldest month (with the lowest average low temperature) is February (17.1°F).
Average pressure in September
Juneau, AK
- Average pressure in September: 29.89"Hg
The month with the highest atmospheric pressure is July (30.03"Hg).
The month with the lowest atmospheric pressure is November (29.8"Hg).
Average wind speed in September
Juneau, AK
- Average wind speed in September: 5.2mph
The windiest month (with the highest average wind speed) is January (6.9mph).
The calmest months (with the lowest average wind speed) are June and July (3.7mph).
Average humidity in September
Juneau, AK
- Average humidity in September: 90%
The month with the highest relative humidity is January (92%).
The month with the lowest relative humidity is May (86%).
Average rainfall in September
Juneau, AK
- Average rainfall in September: 8.27"
The wettest month (with the highest rainfall) is October (9.88").
The driest month (with the least rainfall) is May (4.13").
Average rainfall days in September
Juneau, AK
- Average rainfall days in September: 21.9 days
The month with the highest number of rainy days is September (21.9 days).
The month with the least rainy days is February (4.8 days).
Average snowfall in September
Juneau, AK
- Average snowfall in September: 0"
The month with the highest snowfall is December (62.8").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Juneau, AK
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (21.9 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average sea temperature in September
Juneau, AK
- Average sea temperature in September: 50.9°F
The best month for swimming (with the highest average sea temperature) is August (53.5°F).
The coldest month (with the lowest average sea temperature) is March (40.3°F).
Average daylight in September /
Average sunshine in September
Juneau, AK
- Average daylight in September: 12h and 5min
The month with the longest days is June (Average daylight: 18h and 12min).
The month with the shortest days is December (Average daylight: 6h and 30min).
- Average sunshine in September: 4h and 5min
The month with the most sunshine is June (Average sunshine: 6h and 24min).
The month with the least sunshine is November (Average sunshine: 2h and 36min).
Average sunshine days in September
Juneau, AK
- Average sunshine days in September: 7.5 days
The month with the most sunshine days is May (10 days).
The month with the least sunshine days is November (6.1 days).
Average UV index in September
Juneau, AK
- Average UV index in September: 2
The months with the highest UV index are May and July (UV index 3).
The months with the lowest UV index are January, April, October, November and December (UV index 1).
Average cloud cover in September
Juneau, AK
- Average cloud cover in September: 67
The months with the most cloud cover are January and November (Cloud cover 72).
The month with the least cloud cover is May (Cloud cover 61).
Average visibility in September
Juneau, AK
- Average visibility in September: 4mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (4mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (4mi).
Juneau, Alaska, USA
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