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 fresh 54.1°F (12.3°C) in August to a frosty 48.2°F (9°C). Juneau, during September nights, experiences a subtle shift to a low average of 39.7°F (4.3°C) from the day's heat.Humidity
In September, the average relative humidity is 90%.Rainfall
In September, the rain falls for 21.9 days. Throughout September, 8.27" (210mm) of precipitation is accumulated. In Juneau, during the entire year, the rain falls for 172.4 days and collects up to 85.87" (2181mm) of precipitation.Snowfall
In Juneau, snow does not fall in June through September.Ocean temperature
In Juneau, the average seawater temperature in September is 50.9°F (10.5°C).Note: Danger awaits those who swim in 50.9°F (10.5°C) without protection. Falling below 50°F (10°C) means intense cold shock and hyperventilation.
Daylight
The average length of the day in September in Juneau is 12h and 46min.On the first day of the month, sunrise is at 5:59 am and sunset at 7:55 pm. On the last day of September, sunrise is at 7:01 am and sunset at 6:32 pm AKDT.
Sunshine
The average sunshine in September is 4.9h.UV index
In Juneau, the average daily maximum UV index in September is 2. A UV Index reading of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV rays for average individuals.Note: In September, an average UV index of 2 transforms into the following instructions:
Apart from children, who require continuous protection, most can endure sun exposure for up to an hour without experiencing burns. During midday, the Sun's radiation is strongest, and it's advisable to reduce direct exposure. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Juneau in September?
What is the average humidity in September in Juneau?
How many days does it rain in September?
When it does not snow?
Does it snow in September?
How cold is the water in September?
What is the average length of the day in September?
When are sunrise and sunset in September?
How many hours of sunshine does Juneau have in September?
What is the UV index intensity 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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