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Ketchikan Gateway Borough (Ketchikan)
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Weather in Ketchikan Gateway Borough, Alaska for September 2025

Your guide to Ketchikan Gateway Borough weather in September - trends and predictions

    Official Weather Alert ⚠️

  • Special Weather Statement - See hour by hour.

    • Temperatures

  • Until now, September 2025 in Ketchikan Gateway Borough has been nearly identical to the historical average, with a temperature of 15.5 °F (showing only a slight deviation of 0.4 °F).

  • Expect cooler weather in the next days in Ketchikan Gateway Borough with the forecast suggesting a temperature of 12.9 °F, lower than the historical average.

  • In general, the average temperature in Ketchikan Gateway Borough at the beginning of September is 15.9 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 11 °F by the end of September.

    • Rain 🌧️

  • Ketchikan Gateway Borough experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 447.6 mm.

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
6
Dry days
Average rainy days
24
Rainy days
Average snowy days
0
Snow days
Average temperatures
13°/9°
Temperatures
Average wind speed
14 km/h
Avg max wind
Average humidity
86 %
Avg humidity

Ketchikan Gateway Borough Weather September

Move between months or click on a day
August
October
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Overcast
18°
2
Overcast
18°
3
Cloudy
15°
4
Light rain shower
16°
5
Light rain shower
14°
6
Cloudy
15°
7
Light rain shower
15°
8
Light rain shower
15°
9
Overcast
16°
10
Patchy light drizzle
15°
11
Moderate rain
15°
12
Moderate rain
12°
13
Mist
13°
14
Moderate rain
13°
15
Weather Alert Heavy rain
11°
16
Patchy rain possible
21°
17
Heavy rain
13°
18
Partly cloudy
15°
19
Heavy rain
12°
20
Moderate rain
13°
21
Moderate rain
13°
22
Patchy rain possible
12°
23
Patchy rain possible
12°
24
Sunny
12°
25
Patchy rain possible
12°
26
Partly cloudy
13°
27
Moderate rain
9°
28
Patchy rain possible
12°
29
Partly cloudy
10°
30
Overcast
9°

Temperatures trend during September in Ketchikan Gateway Borough

See the weather trend as well as the moving average line

September weather in Ketchikan Gateway Borough day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
Sept. 1 Overcast
Overcast
 18° /11° 2.7 mm 4
Sept. 2 Overcast
Overcast
 18° /11° 0 mm 5
Sept. 3 Cloudy
Cloudy
 15° /10° 0 mm 4
Sept. 4 Light rain shower
Light rain shower
 16° /11° 3.3 mm 4
Sept. 5 Light rain shower
Light rain shower
 14° /11° 9.5 mm 3
Sept. 6 Cloudy
Cloudy
 15° /10° 0.2 mm 4
Sept. 7 Light rain shower
Light rain shower
 15° /11° 0.2 mm 4
Sept. 8 Light rain shower
Light rain shower
 15° /10° 0.1 mm 4
Sept. 9 Overcast
Overcast
 16° /10° 0 mm 4
Sept. 10 Patchy light drizzle
Patchy light drizzle
 15° /10° 2.3 mm 3
Sept. 11 Moderate rain
Moderate rain
 15° /10° 29.3 mm 4
Sept. 12 Moderate rain
Moderate rain
 12° /10° 9 mm 3
Sept. 13 Mist
Mist
 13° /9° 23.4 mm 3
Sept. 14 Moderate rain
Moderate rain
 13° /9° 15.7 mm 3
Sept. 15 Heavy rain
Heavy rain
 11° /10° 27.9 mm 0.1
Sept. 16 Patchy rain possible
Patchy rain possible
 21° /12° 4.9 mm 0.7
Sept. 17 Heavy rain
Heavy rain
 13° /12° 27.5 mm 0.2
Sept. 18 Partly cloudy
Partly cloudy
 15° /11° 0 mm 0.7
Sept. 19 Heavy rain
Heavy rain
 12° /10° 21.3 mm 0
Sept. 20 Moderate rain
Moderate rain
 13° /11° 11.5 mm 3
Sept. 21 Moderate rain
Moderate rain
 13° /10° 5.1 mm 3
Sept. 22 Patchy rain possible
Patchy rain possible
 12° /9° 4.5 mm 2
Sept. 23 Patchy rain possible
Patchy rain possible
 12° /7° 2.7 mm 2
Sept. 24 Sunny
Sunny
 12° /6° 0 mm 3
Sept. 25 Patchy rain possible
Patchy rain possible
 12° /6° 0.1 mm 2
Sept. 26 Partly cloudy
Partly cloudy
 13° /7° 0 mm 3
Sept. 27 Moderate rain
Moderate rain
 9° /7° 9.9 mm 2
Sept. 28 Patchy rain possible
Patchy rain possible
 12° /7° 3.9 mm 2
Sept. 29 Partly cloudy
Partly cloudy
 10° /6° 1.9 mm 3
Sept. 30 Overcast
Overcast
 9° /6° 35.8 mm 3
Next
Important Notice
Our weather forecast for Ketchikan Gateway Borough in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Ketchikan Gateway Borough forecast closer to your planned date for the most up-to-date weather information.
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Ketchikan Gateway Borough in September - FAQ

What are the expected maximum and minimum temperatures in Ketchikan Gateway Borough during September?
During September, expect a variety of temperatures with highs around 13° and lows near 9°, suitable for diverse activities and preferences.
How much rainfall should be expected in Ketchikan Gateway Borough during September?
Significant rainfall exceeding 447.6 mm is expected in Ketchikan Gateway Borough during September, occurring over more than 24 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Ketchikan Gateway Borough during September?
The average wind speed in Ketchikan Gateway Borough during September is 14 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Ketchikan Gateway Borough

Explore the daily rainfall trends and prepare for Ketchikan Gateway Boroughs September weather 💧

UV exposure in Ketchikan Gateway Borough during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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Location coordinates Where is Ketchikan Gateway Borough?

Get accurate weather forecasts for Ketchikan Gateway Borough, located at latitude 55.342 and longitude -131.648. Stay updated with localized weather information tailored for Ketchikan Gateway Borough.

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