Ketchikan Alaska weather is some of the wettest in Alaska. This town in located in the heart of the temperate rainforest of Alaska's Inside Passage.
Local precipitation averages almost 150 inches a year, which is over 4 times more than in nearby Juneau, more than five times that received by Seattle, and ten times that which falls in Anchorage.
This is simply one of the wettest places in all of North America. The constant precipitation keeps the area amazingly lush and constantly moist.
Nearby fjords such as Tracy Arm and Misty Fjords show off the benefit of all this rainfall, with seemingly endless waterfalls cascading down the sides of their cliffs.
KETCHIKAN MONTHLY AVERAGES
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Maximum temperature
39
42
45
50
57
62
65
66
61
52
45
41
Minimum temperature
28
32
33
36
41
47
51
52
47
41
35
31
Monthly precipitation
12.7
13.0
10.7
11.3
9.2
7.3
7.3
10.6
13.8
22.3
17.1
15.4
Monthly snowfall
13.3
8.9
3.4
0.3
0.1
0.0
0.0
0.0
0.0
0.1
2.3
8.6
June and July are the two "driest" months, during which the city receives a relatively modest 7 inches of rain.
For comparison's sake, nearby towns and cities such as Juneau and Skagway receive as little as 1 inch during these same months.
That being said, I have been in Ketchikan in the summer when it was perfectly sunny and comfortably warm.
So when visiting this town, definitely bring your rain gear, but dress in layers, as it's possible the sun may poke through the clouds and warm things up.
Overall, Ketchikan Alaska weather is wet but temperate, and all that rain is what makes the region so breathtakingly beautiful.