Anchorage weather in September: Anchorage, Alaska: normal highs, lows, rain and records for September
Anchorage in September has a normal high of 56°F and a normal low of 43°F, a daily mean of 49°F, falling from 61°F on the 1st to 50°F by the 30th. Measurable precipitation falls on 15 days in a normal September, 3.10 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 13°C and low of 6°C, 79 mm of precipitation and 1 cm of snow in September.
- NOAA stationAnchorage Ted Stevens International Airport
- Station IDUSW00026451
- Location61.17°N 150.03°W
- Elevation120 ft (37 m)
- Population289,600
- Jan 23° 11°
- Feb 27° 15°
- Mar 33° 19°
- Apr 45° 30°
- May 56° 40°
- Jun 63° 48°
- Jul 66° 53°
- Aug 64° 51°
- Sep 56° 43°
- Oct 42° 31°
- Nov 29° 18°
- Dec 25° 14°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Anchorage in September?
The normal high is 56°F and the normal low 43°F, for a daily mean of 49.3°F. September is 8.2°F cooler than August and 13.0°F warmer than October. September is the 4th warmest month of the year in Anchorage and the wettest. Across the month the normal high falls 11°F, from 61°F on September 1 to 50°F on September 30. From one year to the next September's mean temperature typically moves about 2.8°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 47°F and 52°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 50%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 61°F | 47°F | 49% | 27% |
| September 8 | 58°F | 45°F | 50% | 27% |
| September 15 | 56°F | 43°F | 49% | 26% |
| September 22 | 54°F | 41°F | 48% | 25% |
| September 30 | 50°F | 38°F | 45% | 23% |
Every day of September: normal high, low and chance of precipitation (warmest afternoon September 1, coldest night September 30)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| September 1 | 61°F | 47°F | 49% | 27% | 14 h 20 min |
| September 2 | 60°F | 47°F | 49% | 27% | 14 h 20 min |
| September 3 | 60°F | 47°F | 49% | 27% | 14 h 10 min |
| September 4 | 60°F | 46°F | 50% | 27% | 14 h |
| September 5 | 59°F | 46°F | 50% | 27% | 14 h |
| September 6 | 59°F | 46°F | 50% | 27% | 13 h 50 min |
| September 7 | 59°F | 46°F | 50% | 27% | 13 h 50 min |
| September 8 | 58°F | 45°F | 50% | 27% | 13 h 40 min |
| September 9 | 58°F | 45°F | 50% | 27% | 13 h 40 min |
| September 10 | 58°F | 45°F | 50% | 26% | 13 h 30 min |
| September 11 | 57°F | 44°F | 49% | 26% | 13 h 30 min |
| September 12 | 57°F | 44°F | 49% | 26% | 13 h 20 min |
| September 13 | 57°F | 44°F | 49% | 26% | 13 h 10 min |
| September 14 | 56°F | 43°F | 49% | 26% | 13 h 10 min |
| September 15 | 56°F | 43°F | 49% | 26% | 13 h |
| September 16 | 56°F | 43°F | 49% | 26% | 13 h |
| September 17 | 55°F | 43°F | 49% | 26% | 12 h 50 min |
| September 18 | 55°F | 42°F | 49% | 25% | 12 h 50 min |
| September 19 | 55°F | 42°F | 49% | 25% | 12 h 40 min |
| September 20 | 54°F | 42°F | 48% | 25% | 12 h 30 min |
| September 21 | 54°F | 41°F | 48% | 25% | 12 h 30 min |
| September 22 | 54°F | 41°F | 48% | 25% | 12 h 20 min |
| September 23 | 53°F | 41°F | 47% | 25% | 12 h 20 min |
| September 24 | 53°F | 40°F | 47% | 24% | 12 h 10 min |
| September 25 | 52°F | 40°F | 47% | 24% | 12 h 10 min |
| September 26 | 52°F | 40°F | 46% | 24% | 12 h |
| September 27 | 52°F | 39°F | 46% | 24% | 11 h 50 min |
| September 28 | 51°F | 39°F | 46% | 23% | 11 h 50 min |
| September 29 | 51°F | 39°F | 45% | 23% | 11 h 40 min |
| September 30 | 50°F | 38°F | 45% | 23% | 11 h 40 min |
- Normal high
- 56°FSeptember average
- Normal low
- 43°FSeptember average
- Precipitation
- 3.10 inmonth total
- Days with precipitation
- 150.01 inch or more
- Snowfall
- 0.4 inmonth total
- Nights at 32°F or colder
- 3
- Daylight
- 14 h 20 min to 11 h 40 minSeptember 1 to September 30
- Sunshine
- 61%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00026451; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain or snow in Anchorage in September?
On a given September day the chance of 0.01 inch or more is 48% on average, highest around September 4 (50%). In all, 3.10 in falls on 15 days of a normal September.
In a normal September in Anchorage, 3 nights fall to freezing and snowfall averages 0.4 inches.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00026451.
How humid and windy is Anchorage in September?
At 3 p.m. the normal temperature is 48°F with 63% relative humidity and a dew point of 36°F; at 6 a.m. it is 41°F with 81% humidity. The wind averages 6.5 mph, most often from the northeast in the afternoon. A dew point under 50°F feels dry.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 41°F | 35°F | 81% | 6.0 mph | 25% |
| 9 a.m. | 42°F | 36°F | 78% | 6.7 mph | 10% |
| noon | 46°F | 36°F | 68% | 7.2 mph | 11% |
| 3 p.m. | 48°F | 36°F | 63% | 7.2 mph | 9% |
| 6 p.m. | 47°F | 37°F | 68% | 6.3 mph | – |
| 9 p.m. | 43°F | 36°F | 76% | 6.3 mph | 15% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00026451. Hourly normals exist only for NOAA's first-order stations; a dash where NOAA publishes no value for that hour (the sky at some hours).
What are the records for September in Anchorage?
The warmest September temperature on Anchorage's official record (since 1953) is 73°F, on September 5, 1957; the coldest is 19°F, on September 24, 1992. The wettest September brought 7.70 in (2015); the snowiest, 6.3 inches (2004).
The September mean against the 1991-2020 normal of 49.3°F: 2021 47.4°F (−1.9), 2022 50.3°F (+1.0), 2023 48.2°F (−1.1), 2024 50.2°F (+0.9), 2025 50.6°F (+1.4), 2026 50.0°F (+0.7). 4 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 47.4°F | −1.9°F | 1.95 in |
| 2022 | 50.3°F | +1.0°F | 5.18 in |
| 2023 | 48.2°F | −1.1°F | 3.03 in |
| 2024 | 50.2°F | +0.9°F | 3.38 in |
| 2025 | 50.6°F | +1.4°F | 3.99 in |
| 2026 | 50.0°F | +0.7°F | 2.79 in |
Source: records: ACIS, NWS threaded record ANCthr; recent months: ACIS, station USW00026451. Records and recent months use complete months only.
How does September in Anchorage compare across Alaska?
Across the 85 places PlainClimate covers in Alaska, September normal highs run from 37°F in Utqiaġvik to 60°F in Klawock; Anchorage's is 56°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.