Anchorage Weather in September
United States · Subarctic climate · Data averaged from 2020-01-01 to 2024-12-31 (5 years)
September in Anchorage sees average temperatures ranging from a low of 6.2°C (43.2°F) to a high of 12.4°C (54.3°F), with a mean of 9.0°C (48.2°F). Compared to the annual average of 2.5°C (36.5°F), this month is 6.5°C warmer than the yearly norm. Precipitation averages 128.1mm, making it approximately 56.0mm wetter than the monthly average of 72.0mm. The city receives an average of 6.5 hours of sunshine per day during September, with relative humidity averaging 82.9%. Wind speeds reach an average maximum of 13.0 km/h. Snowfall averages 0.8cm during September, which can affect travel plans and outdoor activities. For travelers, this month offers a temperature experience in Anchorage, with wetter-than-average conditions compared to the rest of the year.
Anchorage's subarctic climate creates long, cold winters and short, mild summers. I've tracked the daylight data and found that the city receives over 19 hours of daylight in June and barely 6 hours in December. The best time for visiting is June to August, when the temperatures are mild and the natural attractions are accessible.
September vs Adjacent Months
| Metric | August | September | October |
|---|---|---|---|
| Mean Temp | 14.0°C (57.2°F) | 9.0°C (48.2°F) | 2.0°C (35.6°F) |
| Rainfall | 145.5mm | 128.1mm | 80.7mm |
| Sunshine | 8.3 hrs | 6.5 hrs | 5.1 hrs |
| Humidity | 80.4% | 82.9% | 79.2% |
| Wind | 13.3 km/h | 13.0 km/h | 12.9 km/h |
| Rainy Days | 20.6 | 22.2 | 13.4 |
| Snowfall | 0.0 cm | 0.8 cm | 13.5 cm |
Seasonal Context
September falls in Autumn in the Northern Hemisphere. Autumn sees temperatures gradually cooling from summer highs. For travelers visiting Anchorage in September, the data indicates mixed conditions based on the combination of temperature, precipitation, and daylight hours.
Frequently Asked Questions
What is the average temperature in Anchorage in September?
The average temperature in Anchorage during September ranges from 6.2°C (43.2°F) to 12.4°C (54.3°F), with a mean of 9.0°C (48.2°F).
How much does it rain in Anchorage in September?
Anchorage receives an average of 128.1mm of precipitation in September, spread across approximately 22.2 rainy days.
What should I pack for Anchorage in September?
Based on September weather data, pack warm layers, a medium jacket, and waterproof outerwear. Rain gear is essential — this month averages 128.1mm of precipitation.
Is September a good time to visit Anchorage?
September is a cooler month, suitable for travelers who prefer mild weather and fewer crowds. Pack warm layers and enjoy indoor attractions.
Other Months for Anchorage
Cities with Similar September Climate (Subarctic)
Data Source: Open-Meteo historical archive (2020-01-01 to 2024-12-31). Daily measurements aggregated into monthly climate normals. Coordinates: 61.22°, -149.9°. Timezone: America/Anchorage. Last updated: 2026-07-30.