Anchorage weather in September
Temperature, sea and sunshine in September: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in September
Poor
Best time to visit: June – July
What is the weather like in Anchorage in September?
In September, Anchorage is cool: daytime highs average 12 °C, and nights cool down to about 7 °C. The sea averages 12.3 °C – swimming is only for the hardy. Expect around 5 hours of sunshine a day. It rains often – on about 15 days, adding up to 105 mm. All in all, September is not an ideal month for a holiday in Anchorage.
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 61 | 33 | 13 |
| Day | 17° | 12° | 5° |
| Night | 11° | 7° | 0° |
| Sea | 14° | 12° | 8° |
| Sun | 6 h | 5 h | 3 h |
| Rain days | 14 | 15 | 12 |
More details for September
- Daylight
- 13 h 3 min07:24 – 20:26
- UV index
- 2 · lowclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 14 km/haverage daily peakAll months
- Cloud cover
- 72 %on averageAll months
- Hot days
- 0 days30 °C or more
- Snow days
- 0 days1 cm or more of fresh snowAll months
- Time zone
- UTC−8America/Anchorage
How the score comes together
- Temperatureweight 50 %41 %
- Sunshineweight 20 %27 %
- Few rainy daysweight 30 %23 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in September
- A jumper for the evenings
- Rain jacket or umbrella
Anchorage in September: quick answers
Is Anchorage hot in September?
No. In September, Anchorage is cool: daytime highs average 12 °C and nights drop to about 7 °C.
Can you swim in Anchorage in September?
Only if you don't mind cold water: in September the sea averages just 12.3 °C. Comfortable swimming temperatures are not reached at any time of year.
Does it rain much in Anchorage in September?
It rains often – on about 15 days, adding up to 105 mm.
Anchorage month by month
The whole year in AnchorageAll destinations: USAWhere to go in SeptemberSea temperature in September
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences