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 start of September marks an average high-temperature of a cool 53.1°F (11.7°C), hardly distinguishable from the conditions in August. Old Harbor encounters a small divergence from daytime high temperatures, averaging a low-temperature of 47.7°F (8.7°C) during September nights.Humidity
The average relative humidity in September is 83%.Rainfall
In Old Harbor, during September, the rain falls for 17.6 days and regularly aggregates up to 3.27" (83mm) of precipitation. In Old Harbor, during the entire year, the rain falls for 171.2 days and collects up to 37.32" (948mm) of precipitation.Snowfall
January through May, September through December are months with snowfall in Old Harbor. September is the first month it typically snows. 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 September, sunrise is at 7:17 am and sunset at 9:08 pm. On the last day of the month, sunrise is at 8:16 am and sunset at 7:48 pm AKDT.
Sunshine
In September, the average sunshine is 5.8h.UV index
June through September, with an average maximum UV index of 3, are months with the highest UV index. A UV Index estimate of 3 to 5 represents a moderate threat to health from unsafe exposure to UV radiation for average individuals.Note: The maximum daily UV index of 3 in September converts into the following recommendations:
Guard yourself - Precautionary measures against sun damage are advocated. When the Sun is at its strongest around midday, find shade and limit exposure. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key. Be careful! The Sun's UV radiation can nearly be doubled by the reflective quality of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in September?
What is the average humidity in September?
How much does it rain in September?
When does it start snowing?
What is the average length of the day in September?
What time are sunrise and sunset in September?
How long on average sun shines in September?
When is the highest UV index?
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
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