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
Old Harbor's September reports an average high-temperature of a fresh 53.1°F (11.7°C), exhibiting a minor difference from August. September sees a slight dip to an average low temperature of 47.7°F (8.7°C) from the daytime highs.Humidity
In September, the average relative humidity is 83%.Rainfall
In September, the rain falls for 17.6 days. Throughout September, 3.27" (83mm) of precipitation is accumulated. Throughout the year, there are 171.2 rainfall days, and 37.32" (948mm) of precipitation is accumulated.Snowfall
January through May, September through December are months with snowfall in Old Harbor. September is the first month it typically snows in Old Harbor, Alaska. Throughout September, in the average 0.1 snowfall days, it receives 0.08" (2mm) of snow. In Old Harbor, during the entire year, snow falls for 35.1 days and aggregates up to 13.74" (349mm) of snow.Daylight
The average length of the day in September is 12h and 44min.On the first day of the month, sunrise is at 7:17 am and sunset at 9:08 pm. On the last day of September, in Old Harbor, sunrise is at 8:16 am and sunset at 7:48 pm AKDT.
Sunshine
The average sunshine in September is 5.8h.UV index
June through September, with an average maximum UV index of 3, are months with the highest UV index in Old Harbor, Alaska. A UV Index reading of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The UV index of 3 during September translates into the following guidance:
Put precautions into practice - Ensuring skin and eye safety is a necessity. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. Opt for tightly woven and loose clothing to enhance protection from the Sun. Be attentive! The reflective property of snow can nearly double the Sun's UV radiation.
Frequently asked questions
What is the usual temperature for Old Harbor in September?
What is the average humidity in September in Old Harbor?
How many days does it rain in September in Old Harbor?
When does it start to snow in Old Harbor?
How many hours of daylight does Old Harbor have in September?
When are sunrise and sunset in September in Old Harbor?
How long on average sun shines in September in Old Harbor?
What is the month with the highest UV index in Old Harbor?
How high is the UV index in September in Old Harbor?
Average temperature in September
Old Harbor, AK
- Average high temperature in September: 53.1°F
The warmest month (with the highest average high temperature) is August (57.6°F).
The month with the lowest average high temperature is January (35.4°F).
- Average low temperature in September: 47.7°F
The month with the highest average low temperature is August (50.7°F).
The coldest month (with the lowest average low temperature) is March (30.6°F).
Average pressure in September
Old Harbor, AK
- Average pressure in September: 29.71"Hg
The month with the highest atmospheric pressure is July (29.98"Hg).
The month with the lowest atmospheric pressure is December (29.55"Hg).
Average wind speed in September
Old Harbor, AK
- Average wind speed in September: 10.3mph
The windiest month (with the highest average wind speed) is December (14.2mph).
The calmest month (with the lowest average wind speed) is July (7.8mph).
Average humidity in September
Old Harbor, AK
- Average humidity in September: 83%
The month with the highest relative humidity is July (86%).
The months with the lowest relative humidity are March and November (80%).
Average rainfall in September
Old Harbor, AK
- Average rainfall in September: 3.27"
The wettest months (with the highest rainfall) are October and November (4.53").
The driest month (with the least rainfall) is July (1.85").
Average rainfall days in September
Old Harbor, AK
- Average rainfall days in September: 17.6 days
The month with the highest number of rainy days is September (17.6 days).
The month with the least rainy days is March (10.8 days).
Average snowfall in September
Old Harbor, AK
- Average snowfall in September: 0.08"
The month with the highest snowfall is March (3.15").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Old Harbor, AK
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is March (8.5 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Old Harbor, AK
- Average daylight in September: 12h and 4min
The month with the longest days is June (Average daylight: 17h and 48min).
The month with the shortest days is December (Average daylight: 6h and 48min).
- Average sunshine in September: 5h and 5min
The month with the most sunshine is July (Average sunshine: 8h and 18min).
The months with the least sunshine are January and December (Average sunshine: 2h and 36min).
Average sunshine days in September
Old Harbor, AK
- Average sunshine days in September: 11.5 days
The month with the most sunshine days is July (14.7 days).
The month with the least sunshine days is April (10.7 days).
Average UV index in September
Old Harbor, AK
- Average UV index in September: 3
The months with the highest UV index are June, July, August and September (UV index 3).
The month with the lowest UV index is January (UV index 1).
Average cloud cover in September
Old Harbor, AK
- Average cloud cover in September: 52
The month with the most cloud cover is January (Cloud cover 63).
The month with the least cloud cover is September (Cloud cover 52).
Average visibility in September
Old Harbor, AK
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Old Harbor, Alaska, USA
Weather forecast for your location
2. Allow the app to use your location
