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September Weather in Anchorage, United States

Last updated: June 24, 2025

In Anchorage, United States, the average temperature in September hovers around 22°C (71°F), providing a pleasant climate. However, be prepared for a temperature range that can dip to a cool 8°C (47°F) and soar up to a warm 36°C (96°F). During this month, precipitation totals approximately 118 mm (4.7 in) across 9 days, making it wise to carry an umbrella. With an average humidity of 69%, the air can feel a bit muggy, so dress accordingly!

September Temperature in Anchorage

In September in Anchorage, the average temperature is 22°C (71°F), with maximums reaching 36°C (96°F) and minimums dropping as low as 8°C (47°F). Be prepared for warm days and cool nights while exploring the beautiful sights of Anchorage.

September Weather in Anchorage: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Anchorage, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Anchorage, September typically has an average temperature of 22°C (71°F), with highs reaching up to 36°C (96°F) and lows dropping to around 8°C (47°F).
JanFebMarAprMayJunJulAugSepOctNovDec353947566774787671604541
Data source: Temperature data for Anchorage generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Anchorage

In Anchorage in September, the precipitation amount is 118 mm (4.7 in), occurring over a span of 9 days.

September Precipitation Trends in Anchorage

The chart displays monthly precipitation patterns in Anchorage, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Anchorage, September typically receives around 118 mm (4.7 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec90137138141125158989611810391110
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Anchorage

In Anchorage in September humidity is 69%. With an average temperature of 22°C (71°F), this humidity feels like walking through a warm embrace, making travel slightly uncomfortable yet refreshing, as the air clings to your skin and adds a layer of warmth to your exploration.

September Average Humidity in Anchorage

This chart illustrates the average monthly humidity levels in Anchorage, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Anchorage is approximately 69%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%85%86%84%79%82%79%70%69%76%88%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Anchorage

In Anchorage in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Anchorage.

Maximum UV Index Levels in Anchorage for September

The chart shows the monthly maximum UV Index (UVI) for Anchorage in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Anchorage typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3579101110108743
Data source: Anchorage September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How September Weather in Anchorage Compares to Other Months

Weather in Anchorage varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Anchorage, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Anchorage, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather2°C (35°F)90 mm (3.5 inches)87%moderate
February Weather4°C (40°F)137 mm (5.4 inches)85%moderate
March Weather9°C (48°F)138 mm (5.4 inches)86%high
April Weather13°C (56°F)141 mm (5.6 inches)84%very high
May Weather20°C (67°F)125 mm (4.9 inches)79%very high
June Weather23°C (75°F)158 mm (6.2 inches)82%extreme
July Weather26°C (78°F)98 mm (3.8 inches)79%very high
August Weather24°C (76°F)96 mm (3.8 inches)70%very high
September Weather22°C (71°F)118 mm (4.7 inches)69%very high
October Weather16°C (60°F)103 mm (4.1 inches)76%high
November Weather7°C (45°F)91 mm (3.6 inches)88%moderate
December Weather5°C (41°F)110 mm (4.3 inches)87%moderate

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