Climate averages 1991–2020

Anchorage weather
in October.

A cold, wet month: the 7th warmest and the 10th driest of the year.

Long-term climate patterns, not a forecast for a particular trip.

Average high 4.4°C Daytime mean, October

Average low -0.2°C Night-time mean, October

Rainfall 90 mm 13 days with ≥1 mm

Daylight 10 h Sunrise to sunset, per day

October is a cold month in Anchorage: daytime highs average 4.4°C and nights cool to about -0.2°C. By daytime temperature it is the 7th warmest of the 12 months.

Expect about 90 mm of rain on roughly 13 days, which makes October a wet month (the 10th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 10 h 07 min on an average October day.

Among the 498 cities listed in the United States, Anchorage ranks 498th of 498 for the warmest October highs and joint 338th of 498 for the driest October (rainfall, lowest first). The mean October high of those 498 cities is 21.4°C; Anchorage is 17.0°C cooler than that mean.

From October to November, average highs fall by 7.0°C to -2.6°C, and monthly precipitation falls from 90 mm to 66 mm.

The annual picture

October in context

30-year average

Average highAverage low°C

Monthly precipitation

Average total · mm

Averages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated

Every month, side by side

Anchorage climate table

1991–2020

Monthly climate averages for Anchorage, 1991–2020
Month	Average highHigh / low	Average low	Precipitation mm/month	Wet days ≥1 mm/day	Daylight hours/dayDaylight h/day
January	-6.8°C-10.9°C	-10.9°C	50	10.4	6.56 h
February	-3.9°C-8.5°C	-8.5°C	50	9.7	8.99 h
March	-1.2°C-7.2°C	-7.2°C	38	8.5	11.712 h
April	4.7°C-1.8°C	-1.8°C	29	7.3	14.715 h
May	10.1°C2.9°C	2.9°C	30	7.1	17.417 h
June	15.4°C9.0°C	9.0°C	40	8.9	19.219 h
July	17.3°C11.9°C	11.9°C	73	12.5	18.418 h
August	16.3°C11.0°C	11.0°C	107	14.8	15.916 h
September	11.8°C6.7°C	6.7°C	117	15.3	13.013 h
October, selected	4.4°C-0.2°C	-0.2°C	90	13.2	10.110 h
November	-2.6°C-6.8°C	-6.8°C	66	11.7	7.47 h
December	-5.1°C-9.4°C	-9.4°C	73	12.9	5.66 h

Precipitation (rain or snow, as water) is the average of the 30 separate monthly totals. A wet day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.

Read the numbers correctly

Climate, not a promise.

These patterns help compare months. They cannot tell you the weather on a specific day of your trip.

Sources, method and limits

How these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Anchorage) is explained once on the Anchorage year overview and on the Sources, method and limits page.