Ketchikan (AK) monthly weather averages

Average daytime temperature

The bar chart below shows the average monthly peak daytime temperatures at Ketchikan

Ketchikan average temperature chart (Celsius) Ketchikan average temperature chart (Fahrenheit)
Average monthly temperatures in Ketchikan (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 2 3.7 5.1 7.9 11.4 14.6 16.7 16.8 13.7 9.1 4.7 2.6
°F 35.6 38.6 41.2 46.2 52.5 58.3 62 62.2 56.7 48.3 40.5 36.7

Please note: these are the average peak daytime temperatures (usually around mid-afternoon) so do not show daytime / night highs and lows. To see the daily range of temperatures have a look at the temperature max / min chart below.

Average rainfall & rainy days

The graph below shows the average rainfall and number of rainy days per month.

Ketchikan monthly rainfall chart (mm) Ketchikan monthly rainfall chart (inches)
Average monthly rainfall in Ketchikan (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 285 267 237 236 188 157 154 222 279 480 358 341
inches 11.2 10.5 9.3 9.3 7.4 6.2 6.1 8.8 11 18.9 14.1 13.4
Rainy days 19 17 18 17 16 15 14 15 18 23 21 21

Average annual rainfall in Ketchikan: 3128.534mm (1231.7 inches)

Average daily sunshine

The bar chart below shows the average daily sunshine hours in Ketchikan

Ketchikan average daily sunshine chart
Average daily sunshine Ketchikan
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 1.9 2.8 3.6 5.2 6.3 5.9 5.3 5.2 3.8 2.4 1.8 1.3

Day / night temperatures

The graph below shows the daily range of temperatures for each month.

Ketchikan average minimum / maximum temperatures (Celsius) Ketchikan average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in Ketchikan (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C -3.4 -2 -1.1 0.8 3.6 6.6 9 9.3 6.9 3.6 -0.5 -2.4
Max °C 2.2 3.8 5.3 8.1 11.6 14.8 16.9 17 13.9 9.2 4.9 2.8
Min °F 26 28.4 30.1 33.4 38.5 43.9 48.1 48.7 44.4 38.5 31.2 27.8
Max °F 30.9 33.6 35.8 39.9 45.7 51.3 55.2 55.6 50.7 43.5 36 32.4

Sea temperature

The graph below shows the average sea temperature.

Ketchikan average sea temperature chart (Celsius) Ketchikan average sea temperature chart (Fahrenheit)
Average sea temperature around Ketchikan in degrees centigrade and fahrenheit
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 6.5 6.1 6.1 7 8.8 11.1 12.8 13.2 11.8 9.9 8.3 7.2
°F 43.7 43 43 44.6 47.8 51.9 55 55.8 53.3 49.8 47 44.9

Wind speed

The graph below shows the average wind speed.

Ketchikan average winspeed by month (km/h) Ketchikan average winspeed by month (mph)
Average wind speed in Ketchikan (mph and kmh)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
km/h 17 17 16 16 14 13 12 12 14 17 17 17
mph 11 11 10 10 9 8 8 8 9 10 11 11

A monthly average windspeed of over 16km/h or 10mph suggests a location is fairly windy.

Relative humidity

The graph below shows the average relative humidity.

Ketchikan relative humidity averages
Average relative humidity in Ketchikan
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
78% 78% 75% 74% 74% 76% 79% 81% 83% 83% 80% 80%