Click on a day for an hourly weather forecast
The temperatures in Ketchikan in August are usually low and can range between 11°C and 16°C.
You can expect rain for roughly half of the month of August in Ketchikan. We’re expecting roughly 8 to 15 days of rain, so your rubber boots and umbrella are going to see plenty of use this month if you’re keen on staying dry.
Our weather forecast can give you a great sense of what weather to expect in Ketchikan in August 2025.
If you’re planning to visit Ketchikan in the near future, we highly recommend that you review the 14 day weather forecast for Ketchikan before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 2° / -1° | 16 | 6 | 9 | 515 mm | Awful | Ketchikan in January |
| February | 3° / -1° | 12 | 7 | 9 | 334 mm | Awful | Ketchikan in February |
| March | 5° / 0° | 13 | 7 | 12 | 356 mm | Awful | Ketchikan in March |
| April | 8° / 3° | 13 | 13 | 4 | 299 mm | Awful | Ketchikan in April |
| May | 12° / 6° | 10 | 21 | 0 | 201 mm | Bad | Ketchikan in May |
| June | 14° / 9° | 11 | 19 | 0 | 235 mm | Ok | Ketchikan in June |
| July | 17° / 11° | 11 | 20 | 0 | 228 mm | Ok | Ketchikan in July |
| August | 16° / 11° | 12 | 19 | 0 | 347 mm | Ok | Ketchikan in August |
| September | 14° / 9° | 13 | 17 | 0 | 432 mm | Ok | Ketchikan in September |
| October | 9° / 5° | 15 | 16 | 0 | 464 mm | Bad | Ketchikan in October |
| November | 5° / 2° | 18 | 6 | 6 | 519 mm | Awful | Ketchikan in November |
| December | 2° / -1° | 15 | 8 | 9 | 405 mm | Awful | Ketchikan in December |