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 average high-temperature during September registers at a fresh 52.3°F (11.3°C), closely corresponding to the preceding month. Night temperatures in September exhibit a subtle decrease, settling at an average of 45.3°F (7.4°C).Humidity
The average relative humidity in September is 84%.Rainfall
In September, the rain falls for 19.2 days. Throughout September, 1.73" (44mm) of precipitation is accumulated. In Port Heiden, Alaska, during the entire year, the rain falls for 160.7 days and collects up to 16.57" (421mm) of precipitation.Snowfall
Months with snowfall are January through May, September through December. September is the first month it typically snows. Throughout September, in the average 0.3 snowfall days, it receives 0.12" (3mm) of snow. In Port Heiden, Alaska, during the entire year, snow falls for 83.4 days and aggregates up to 23.94" (608mm) of snow.Daylight
The average length of the day in September is 12h and 44min.On the first day of September, sunrise is at 7:38 am and sunset at 9:29 pm. On the last day of the month, sunrise is at 8:38 am and sunset at 8:10 pm AKDT.
Sunshine
In September, the average sunshine is 4.6h.UV index
May through September, with an average maximum UV index of 3, are months with the highest UV index. A UV Index reading of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for the average person.Note: In September, the maximum UV index of 3 suggests this advice:
Exercise care. People with light skin might get burns in fewer than 30 minutes. Stay safe from the Sun's strongest UV rays by limiting exposure during midday. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun. Be aware! The reflective nature of snow can magnify the Sun's UV radiation almost twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in September?
What is the average humidity in September?
How much does it rain in September?
When does it start snowing in Port Heiden?
How many hours of daylight does Port Heiden have in September?
When is the sunrise / sunset in September?
How long on average sun shines in September?
What is the month with the highest UV index in Port Heiden?
How high is the UV index in September?
Average temperature in September
Port Heiden, AK
- Average high temperature in September: 52.3°F
The warmest month (with the highest average high temperature) is August (56.8°F).
The month with the lowest average high temperature is January (28.9°F).
- Average low temperature in September: 45.3°F
The month with the highest average low temperature is August (49.1°F).
The coldest months (with the lowest average low temperature) are January and March (23.4°F).
Average pressure in September
Port Heiden, AK
- Average pressure in September: 29.72"Hg
The month with the highest atmospheric pressure is July (29.97"Hg).
The month with the lowest atmospheric pressure is December (29.54"Hg).
Average wind speed in September
Port Heiden, AK
- Average wind speed in September: 12.6mph
The windiest month (with the highest average wind speed) is December (14.8mph).
The calmest month (with the lowest average wind speed) is July (9.1mph).
Average humidity in September
Port Heiden, AK
- Average humidity in September: 84%
The month with the highest relative humidity is January (88%).
The month with the lowest relative humidity is May (78%).
Average rainfall in September
Port Heiden, AK
- Average rainfall in September: 1.73"
The wettest month (with the highest rainfall) is October (2.17").
The driest month (with the least rainfall) is June (0.83").
Average rainfall days in September
Port Heiden, AK
- Average rainfall days in September: 19.2 days
The month with the highest number of rainy days is September (19.2 days).
The month with the least rainy days is March (7.6 days).
Average snowfall in September
Port Heiden, AK
- Average snowfall in September: 0.12"
The month with the highest snowfall is December (5.71").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Port Heiden, AK
- Average snowfall days in September: 0.3 days
The month with the highest number of snowfall days is December (15.1 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Port Heiden, 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 54min).
- Average sunshine in September: 4h and 4min
The month with the most sunshine is May (Average sunshine: 7h and 42min).
The month with the least sunshine is December (Average sunshine: 2h and 24min).
Average sunshine days in September
Port Heiden, AK
- Average sunshine days in September: 7.5 days
The month with the most sunshine days is May (13 days).
The month with the least sunshine days is November (6 days).
Average UV index in September
Port Heiden, AK
- Average UV index in September: 3
The months with the highest UV index are May, June, July, August and September (UV index 3).
The months with the lowest UV index are February, March, November and December (UV index 1).
Average cloud cover in September
Port Heiden, AK
- Average cloud cover in September: 65
The month with the most cloud cover is July (Cloud cover 69).
The month with the least cloud cover is May (Cloud cover 59).
Average visibility in September
Port Heiden, AK
- Average visibility in September: 6mi
The months with the highest visibility are April, May, June, July, August, September and October (6mi).
The months with the lowest visibility are January, February, March, November and December (5mi).
Port Heiden, Alaska, USA
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