Weather in Anchorage in September 2025
Average weather
Average temperature in Anchorage in September
The temperature in September is +12°C on average, with a range between a maximum of +19°C during the day and a minimum of 0°C at night.
The average maximum temperature goes down 47% by the end of the month, compared with the beginning of the month, from +19°C to +10°C.
Is Anchorage warm or cold in September?
Anchorage is typically mild in September.
Maximum temperatures go down compared to the previous month from +18°C to +14°C. The minimum temperature also goes down from +11°C to +6°C.
Pack a light jacket as it will be warm in the day and cool in the evenings.
Take a look at how September is compared to other months in Anchorage:
Climate in Anchorage in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +18°C | +14°C | +6°C | ||||
| Min. temperature | ||||||
| +1°C | -4°C | -19°C | ||||
| Max. temperature | ||||||
| +28°C | +22°C | +19°C | ||||
| Rainfall | ||||||
| 135 mm | 180 mm | 143 mm | ||||
| Wind | ||||||
| 2 m/s | 2 m/s | 2 m/s | ||||
| Humidity | ||||||
| 81% | 79% | 80% | ||||
| Air pressure | ||||||
| 1011 HPa | 1006 HPa | 1003 HPa | ||||
| Sunny days | ||||||
| 3 | 3 | 4 | ||||
| Cloudy days | ||||||
| 7 | 6 | 8 | ||||
| Rainy days | ||||||
| 21 | 21 | 13 | ||||
| Snowy days | ||||||
| 0 | 0 | 7 | ||||
September weather is still as ok as in August. It’s getting colder in September. From +18°C in the day, the average maximum temperature lowers to +14°C. Prepare for more rain. Average rainfall goes from 135 mm to 180 mm. It feels drier, as humidity decreases from 81% to 79%. The average wind speed doesn’t change much during September, staying around 2 m/s. The amount of sunny days stay about the same, averaging 3 sunny days during the month.
Next month (October) brings a further decline in the weather.
Wind
The average wind speed is 3 m/s getting up to 11 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in Anchorage is gradually decreasing during September, going from 11 m/s to 2 m/s over the course of the month.
Rain
How was the weather last September in Anchorage?
Climate Change over Years
The climate in Anchorage in September has not changed much over the last 43 years.
The average temperature was the lowest in 1983 (+5°C) and the highest in 2016 (+9°C). The driest year was 1996 with only 360 mm of rainfall, and the wettest year was 2020 with 8052 mm.
FAQ
Is September a good time to visit Anchorage?
Can you sunbathe in Anchorage in September?
Is Anchorage rainy in September?
Is it sunny in Anchorage in September?
Other cities in USA
Monthly weather in Anchorage
Source of the data
For this page, we’ve looked at the typical weather in Anchorage, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.