Anchorage, AK weather in September
September in Anchorage: cool, with frequent rain. Highs 56°F, lows 43°F, rain on about 15 days.
- Normal high
- 56°F
- Normal low
- 43°F
- Wet days
- 15
- 3.1 in total
- Muggy days
- 0
- dew point 65°F+
How September changes from start to finish
| September 1 | September 30 | |
|---|---|---|
| Normal high | 61°F | 50°F |
| Normal low | 47°F | 38°F |
| Chance of a wet day | 49% | 46% |
| Sunrise / sunset | 6:51 am / 9:07 pm | 8:03 am / 7:35 pm |
| Daylight | 14.3 h | 11.5 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 am45°Fdew point 40°F
- 9 am48°Fdew point 41°F
- Noon53°Fdew point 42°F
- 3 pm55°Fdew point 42°F
- 6 pm54°Fdew point 42°F
- 9 pm50°Fdew point 42°F
NOAA hourly normals (local standard time) from Anchorage Merrill Fld (2 mi away); average wind 4 mph.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F2 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 snow15 of 30
- Notable rainat least 0.10 in8 of 30
- Freezing nightslow 32°F or below3 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 and snow in September
Normal precipitation is 3.1 in; a dry September brings about 1.9 in and a wet one about 3.9 in (25th and 75th percentiles). About 2 days bring half an inch or more. Normal snowfall is 0.4 in.
How September varies from year to year
- Warmest September, 1991-20202018: average high 63°F
- Coolest September1992: average high 47°F
- Wettest September2015: 7.7 in
- Driest September2011: 0.6 in
- Highest reading71°F (September 2, 2016)
- Lowest reading19°F (September 24, 1992)
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 | 64°F | 56°F | 42°F |
| Normal low | 51°F | 43°F | 31°F |
| Wet days | 14 | 15 | 12 |
| Comfortable days | 14 | 2 | 0 |
| Daylight | 15.8 h | 12.9 h | 10.0 h |
Highs change by -8°F from August and -14°F into October.
Nearby alternatives in September
- Cooler: Denali Park, AK177 mi · high 51°F · 13 wet days
How Anchorage ranks in September
- Normal high375th warmest of 378 cities; 5th of 8 in Alaska
- Wet days360th driest of 378
- Comfortable days273rd most of 342
What to pack for Anchorage in September
- A rain jacket or umbrella – rain on about 15 days
Heating and cooling
September has 471 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 Anchorage in September?
The normal high is 56°F and the normal low is 43°F. From 1991 to 2020 the coldest September reading was 19°F (September 24, 1992).
Does it rain a lot in Anchorage in September?
About 15 days in September have at least 0.01 in of precipitation, and the normal total is 3.1 in. The wettest September in 1991-2020 was in 2015 (7.7 in); the driest was in 2011 (0.6 in).
Does it snow in Anchorage in September?
Yes. Normal snowfall in September is 0.4 in.
Is September a good time to visit Anchorage?
September ranks 6th of 12 months on our comfort score for Anchorage (50 out of 100). It has about 2 comfortable days. The best month is July.
Where the numbers come from
- Temperature, rain, snowfall, snow depth and frost dates: Anchorage Intl Airport (USW00026451), 5.4 mi SW of the city center, 120 ft . NOAA normals and daily records, 1991-2020.
- Humidity and wind by hour: Anchorage Merrill Fld (USW00026409), 1.5 mi E of the city center, 138 ft . NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Merrill Field Airport (702735-26409), 1.4 mi E of the city center, 126 ft . Hourly observations, 1991-2020.
- Not available for this location: cloud cover (no station close enough or similar enough in elevation).