Ketchikan, AK weather in September
September in Ketchikan: cool, with rain on most days. Highs 59°F, lows 48°F, rain on about 20 days. Keep rain gear handy.
- Normal high
- 59°F
- Normal low
- 48°F
- Wet days
- 20
- 14.3 in total
- Muggy days
- 0
- dew point 65°F+
How September changes from start to finish
| September 1 | September 30 | |
|---|---|---|
| Normal high | 62°F | 56°F |
| Normal low | 51°F | 45°F |
| Chance of a wet day | 63% | 69% |
| Sunrise / sunset | 5:52 am / 7:40 pm | 6:47 am / 6:25 pm |
| Daylight | 13.8 h | 11.6 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Alaska Time).
A typical September day
- 6 am51°Fdew point 49°F
- 9 am54°Fdew point 50°F
- Noon57°Fdew point 50°F
- 3 pm57°Fdew point 49°F
- 6 pm54°Fdew point 50°F
- 9 pm52°Fdew point 49°F
NOAA hourly normals (local standard time) from Ketchikan Intl Airport (3 mi away); average wind 8 mph.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F4 of 30
- Beach dayshigh 80-95°F, under 0.05 in of rain, afternoon wind under 15 mph0 of 30
- Hot dayshigh 90°F or more0 of 30
- Muggy daysdaily mean dew point 65°F or more0 of 30
- Wet daysat least 0.01 in of rain or melted snow20 of 30
- Notable rainat least 0.10 in16 of 30
- Freezing nightslow 32°F or below0 of 30
- Snow on the groundsnow depth 1 in or more0 of 30
Average days per September, counted from daily records for each year 1991-2020.
Rain in September
Normal precipitation is 14.3 in; a dry September brings about 10.3 in and a wet one about 18.0 in (25th and 75th percentiles). About 9 days bring half an inch or more, and about 5 an inch or more.
How September varies from year to year
- Warmest September, 1991-20201995: average high 64°F
- Coolest September1992: average high 55°F
- Wettest September2011: 28.3 in
- Driest September1993: 2.8 in
- Highest reading80°F (September 5, 2017)
- Lowest reading32°F (September 23, 2003)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
September compared with August and October
| August | September | October | |
|---|---|---|---|
| Normal high | 65°F | 59°F | 51°F |
| Normal low | 53°F | 48°F | 41°F |
| Wet days | 17 | 20 | 23 |
| Comfortable days | 14 | 4 | 0 |
| Daylight | 14.9 h | 12.7 h | 10.4 h |
Highs change by -6°F from August and -8°F into October.
How Ketchikan ranks in September
- Normal high371st warmest of 378 cities; 1st of 8 in Alaska
- Wet days374th driest of 378
- Comfortable days227th most of 342
What to pack for Ketchikan in September
- A rain jacket or umbrella – rain on about 20 days
Heating and cooling
September has 342 heating degree days and 0 cooling degree days (base 65°F), 5% of the year's total heating and cooling demand.
Questions
How cold is Ketchikan in September?
The normal high is 59°F and the normal low is 48°F. From 1991 to 2020 the coldest September reading was 32°F (most recently on September 23, 2003).
Does it rain a lot in Ketchikan in September?
About 20 days in September have at least 0.01 in of precipitation, and the normal total is 14.3 in. The wettest September in 1991-2020 was in 2011 (28.3 in); the driest was in 1993 (2.8 in).
Is September a good time to visit Ketchikan?
September ranks 6th of 12 months on our comfort score for Ketchikan (46 out of 100). It has about 4 comfortable days. The best months are July and August.
Where the numbers come from
- Temperature, rain, frost dates and humidity and wind by hour: Ketchikan Intl Airport (USW00025325), 2.8 mi WNW of the city center, 76 ft . NOAA normals and daily records, 1991-2020.
- Snowfall and snow depth: Annette Island Airport (USW00025308), 21 mi S of the city center, 109 ft (69 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Ketchikan Intl Airport (703950-25325), 3.2 mi WNW of the city center, 84 ft . Hourly observations, 1991-2020.
- Not available for this location: cloud cover (no station close enough or similar enough in elevation).