September weather forecastKenai, AK

High rock cliffs of the scenic Spire Cove in Fjords National Park in Kenai, Alaska

September

Weather in September

Kenai ushers in autumn with a noticeable drop in temperature and daylight hours. Meanwhile, a rise in rainfall to a significant 2.72" (69mm) bears the hallmark of an impending transition. The cloud cover increases, dropping subtle hints of the looming winter. However, with reduced UV index reading, the overall conditions remain comfortably cool. The unassuming landscape during this month provides a calm backdrop before the advent of winter.

Temperature

The average high-temperature shows a slight dip in September, from August's mild 59.7°F (15.4°C) to a fresh 53.1°F (11.7°C). Throughout September, a modest shift from daytime highs is anticipated, with an average low-temperature of 45.7°F (7.6°C).

Humidity

In Kenai, Alaska, the average relative humidity in September is 80%.

Rainfall

In Kenai, in September, it is raining for 16.6 days, with typically 2.72" (69mm) of accumulated precipitation. Throughout the year, there are 136.3 rainfall days, and 19.49" (495mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through April, September through December. September is the first month it typically snows. Throughout September, in the average 0.3 snowfall days, it receives 0.2" (5mm) of snow. In Kenai, during the entire year, snow falls for 62.1 days and aggregates up to 30.71" (780mm) of snow.

Ocean temperature

In Kenai, the average seawater temperature in September is 52.3°F (11.3°C).
Note: Being in 52.3°F (11.3°C) waters at 55.4°F (13°C) is discomforting, but anything below 50°F (10°C) can jeopardize breathing and induce cold shock, factoring in physical endurance.

Daylight

The average length of the day in September is 12h and 50min.
On the first day of the month, sunrise is at 7:01 am and sunset at 9:08 pm. On the last day of September, sunrise is at 8:10 am and sunset at 7:38 pm AKDT.

Sunshine

The average sunshine in September is 6.2h.

UV index

In Kenai, the average daily maximum UV index in September is 3. A UV Index value of 3 to 5 symbolizes a medium vulnerability from unsafe exposure to UV radiation for the ordinary person.
Note: In September, the maximum UV index of 3 suggests this advice:
Ensure safety - Recommendations to avert sunburn are presented. To guard against the harmful effects of the Sun, minimize exposure during midday. Always opt for UVA and UVB-resistant sunglasses on radiant days. Note well! The intensity of the Sun's UV rays can be nearly doubled by snow reflection.

Updated: Jun 3, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

The high-temperature, in September, in Kenai, records 53.1°F (11.7°C), while the low-temperature is 45.7°F (7.6°C).

In Kenai, the average relative humidity in September is 80%.

In September, the rain falls for 16.6 days. Throughout September, 2.72" (69mm) of precipitation is accumulated.

September is the first month it typically snows. Throughout September, in the average 0.3 snowfall days, it receives 0.2" (5mm) of snow.

In Kenai, in September, the average water temperature is 52.3°F (11.3°C). Swimming in 52.3°F (11.3°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

In September, the average day length is 12h and 50min.

On the first day of September, sunrise is at 7:01 am and sunset at 9:08 pm. On the last day of the month, sunrise is at 8:10 am and sunset at 7:38 pm AKDT.

The average sunshine duration in September is 6.2h.

In September, the average daily maximum UV index in Kenai is 3. A UV Index value of 3 to 5 symbolizes a moderate vulnerability from exposure to the Sun's UV radiation.

Today

Tomorrow

Long-term

Year J F M A M J J A September O N D

Aug

September

Oct

Average high temperature

59.7°F

53.1°F

43.2°F

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

7.3mph

7.4mph

8.9mph

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

Average snowfall

Average snowfall days

0.3

1.5

Average sea temperature

Average daylight

Average sunshine

Average sunshine days

14.3

11.5

13.1

Average UV index

Average cloud cover

Average visibility

Average temperature in September
Kenai, AK

Average high temperature in September: 53.1°F

The warmest month (with the highest average high temperature) is July (61.3°F).
The month with the lowest average high temperature is January (24.3°F).

Average low temperature in September: 45.7°F

The month with the highest average low temperature is July (51.3°F).
The coldest month (with the lowest average low temperature) is January (18.3°F).

Average pressure in September
Kenai, AK

Average pressure in September: 29.73"Hg

The month with the highest atmospheric pressure is July (29.96"Hg).
The month with the lowest atmospheric pressure is December (29.64"Hg).

Average wind speed in September
Kenai, AK

Average wind speed in September: 7.1mph

The windiest month (with the highest average wind speed) is December (9.6mph).
The calmest month (with the lowest average wind speed) is July (6.6mph).

Average humidity in September
Kenai, AK

Average humidity in September: 80%

The months with the highest relative humidity are January and February (87%).
The month with the lowest relative humidity is May (69%).

Average rainfall in September
Kenai, AK

Average rainfall in September: 2.72"

The wettest month (with the highest rainfall) is October (2.87").
The driest month (with the least rainfall) is June (0.91").

Average rainfall days in September
Kenai, AK

Average rainfall days in September: 16.6 days

The month with the highest number of rainy days is September (16.6 days).
The month with the least rainy days is February (5.5 days).

Average snowfall in September
Kenai, AK

Average snowfall in September: 0.2"

The month with the highest snowfall is December (8.74").
The months with the least snowfall are May, June, July and August (0").

Average snowfall days in September
Kenai, AK

Average snowfall days in September: 0.3 days

The month with the highest number of snowfall days is December (12.7 days).
The months with the least snowfall days are June, July and August (0 days).

Average sea temperature in September
Kenai, AK

Average sea temperature in September: 52.3°F

The best month for swimming (with the highest average sea temperature) is August (53.4°F).
The coldest month (with the lowest average sea temperature) is February (34.2°F).

Average daylight in September /
Average sunshine in September
Kenai, AK

Average daylight in September: 12h and 48min

The month with the longest days is June (Average daylight: 18h and 54min).
The month with the shortest days is December (Average daylight: 5h and 54min).

Average sunshine in September: 6h and 12min

The month with the most sunshine is June (Average sunshine: 10h and 36min).
The month with the least sunshine is December (Average sunshine: 2h and 54min).

Average sunshine days in September
Kenai, AK

Average sunshine days in September: 11.5 days

The month with the most sunshine days is June (16.6 days).
The month with the least sunshine days is September (11.5 days).

Average UV index in September
Kenai, AK

Average UV index in September: 3

The months with the highest UV index are June and July (UV index 4).
The month with the lowest UV index is January (UV index 1).

Average cloud cover in September
Kenai, AK

Average cloud cover in September: 51

The month with the most cloud cover is December (Cloud cover 58).
The month with the least cloud cover is June (Cloud cover 44).

Average visibility in September
Kenai, AK

Average visibility in September: 6mi

The months with the highest visibility are January, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is February (5mi).