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
As August transitions into September, Gustavus sees a gentle drop in the average high-temperature, transitioning from a refreshing 56.5°F (13.6°C) to a cool 51.1°F (10.6°C). A consistent nighttime average temperature of 45°F (7.2°C) is maintained during September.Humidity
In September, the average relative humidity is 88%.Rainfall
In September, in Gustavus, the rain falls for 18.3 days. Throughout September, 3.62" (92mm) of precipitation is accumulated. Throughout the year, there are 182.7 rainfall days, and 37.4" (950mm) of precipitation is accumulated.Snowfall
In Gustavus, snow does not fall in May through September.Daylight
In Gustavus, the average length of the day in September is 12h and 47min.On the first day of the month, sunrise is at 6:04 am and sunset at 8:01 pm. On the last day of September, sunrise is at 7:07 am and sunset at 6:37 pm AKDT.
Sunshine
The average sunshine in September in Gustavus is 5.4h.UV index
In Gustavus, the average daily maximum UV index in September is 2. A UV Index reading of 2, and below, represents a minimal health vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.Note: A daily maximum UV index of 2 in September translates into the following instructions:
While many people can endure lengthy sun exposure, it remains imperative to safeguard babies, children, and fair-skinned individuals. It's recommended to limit sun exposure when its radiation is at its peak during midday. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures?
What is the average humidity in September?
How much does it rain in September?
When it does not snow?
Does it snow in September?
How many hours of daylight does Gustavus have in September?
When is the sunrise / sunset in September?
How long on average sun shines in September?
What is the UV index intensity in September?
Average temperature in September
Gustavus, AK
- Average high temperature in September: 51.1°F
The warmest month (with the highest average high temperature) is July (57.2°F).
The month with the lowest average high temperature is January (30.7°F).
- Average low temperature in September: 45°F
The month with the highest average low temperature is July (49.5°F).
The coldest month (with the lowest average low temperature) is February (25.9°F).
Average pressure in September
Gustavus, AK
- Average pressure in September: 29.88"Hg
The month with the highest atmospheric pressure is July (30.03"Hg).
The month with the lowest atmospheric pressure is November (29.77"Hg).
Average wind speed in September
Gustavus, AK
- Average wind speed in September: 5.1mph
The windiest month (with the highest average wind speed) is January (7mph).
The calmest months (with the lowest average wind speed) are June and July (3.7mph).
Average humidity in September
Gustavus, AK
- Average humidity in September: 88%
The month with the highest relative humidity is August (90%).
The month with the lowest relative humidity is November (84%).
Average rainfall in September
Gustavus, AK
- Average rainfall in September: 3.62"
The wettest months (with the highest rainfall) are October and November (4.21").
The driest month (with the least rainfall) is May (1.61").
Average rainfall days in September
Gustavus, AK
- Average rainfall days in September: 18.3 days
The month with the highest number of rainy days is June (18.9 days).
The month with the least rainy days is February (8.2 days).
Average snowfall in September
Gustavus, AK
- Average snowfall in September: 0"
The month with the highest snowfall is January (11.22").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Gustavus, AK
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is March (13.2 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Gustavus, 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: 5h and 2min
The month with the most sunshine is June (Average sunshine: 7h and 42min).
The months with the least sunshine are January and December (Average sunshine: 2h and 54min).
Average sunshine days in September
Gustavus, AK
- Average sunshine days in September: 10.2 days
The months with the most sunshine days are February and May (12.5 days).
The month with the least sunshine days is June (7.7 days).
Average UV index in September
Gustavus, AK
- Average UV index in September: 2
The month with the highest UV index is July (UV index 4).
The months with the lowest UV index are November and December (UV index 1).
Average cloud cover in September
Gustavus, AK
- Average cloud cover in September: 63
The month with the most cloud cover is November (Cloud cover 71).
The month with the least cloud cover is May (Cloud cover 56).
Average visibility in September
Gustavus, AK
- Average visibility in September: 5mi
The months with the highest visibility are January, February, March, April, May, June, September, October, November and December (5mi).
The months with the lowest visibility are July and August (4mi).
Gustavus, Alaska, USA
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