Fairbanks weather in September: Fairbanks, Alaska: normal highs, lows, rain and records for September
Fairbanks in September has a normal high of 55°F and a normal low of 36°F, a daily mean of 46°F, falling from 62°F on the 1st to 47°F by the 30th. Measurable precipitation falls on 11 days in a normal September, 1.35 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 13°C and low of 2°C, 34 mm of precipitation and 6 cm of snow in September.
- NOAA stationFairbanks International Airport
- Station IDUSW00026411
- Location64.80°N 147.88°W
- Elevation432 ft (132 m)
- From the center7 miles
- Population31,732
- Jan 1° -17°
- Feb 12° -11°
- Mar 25° -3°
- Apr 46° 22°
- May 62° 39°
- Jun 72° 50°
- Jul 73° 53°
- Aug 66° 48°
- Sep 55° 36°
- Oct 34° 18°
- Nov 12° -4°
- Dec 4° -13°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Fairbanks in September?
The normal high is 55°F and the normal low 36°F, for a daily mean of 45.8°F. September is 11.2°F cooler than August and 19.6°F warmer than October. September is the 5th warmest month of the year in Fairbanks and the 4th wettest. Across the month the normal high falls 15°F, from 62°F on September 1 to 47°F on September 30. From one year to the next September's mean temperature typically moves about 4.0°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 42°F and 50°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 40%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 62°F | 42°F | 40% | 16% |
| September 8 | 59°F | 39°F | 37% | 14% |
| September 15 | 56°F | 37°F | 35% | 13% |
| September 22 | 52°F | 34°F | 34% | 12% |
| September 30 | 47°F | 30°F | 32% | 11% |
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 | 62°F | 42°F | 40% | 16% | 14 h 50 min |
| September 2 | 61°F | 42°F | 39% | 16% | 14 h 40 min |
| September 3 | 61°F | 41°F | 39% | 15% | 14 h 30 min |
| September 4 | 61°F | 41°F | 38% | 15% | 14 h 30 min |
| September 5 | 60°F | 41°F | 38% | 15% | 14 h 20 min |
| September 6 | 60°F | 40°F | 38% | 15% | 14 h 10 min |
| September 7 | 60°F | 40°F | 37% | 14% | 14 h 10 min |
| September 8 | 59°F | 39°F | 37% | 14% | 14 h |
| September 9 | 59°F | 39°F | 37% | 14% | 13 h 50 min |
| September 10 | 58°F | 39°F | 36% | 14% | 13 h 50 min |
| September 11 | 58°F | 38°F | 36% | 14% | 13 h 40 min |
| September 12 | 57°F | 38°F | 36% | 13% | 13 h 30 min |
| September 13 | 57°F | 37°F | 36% | 13% | 13 h 30 min |
| September 14 | 57°F | 37°F | 35% | 13% | 13 h 20 min |
| September 15 | 56°F | 37°F | 35% | 13% | 13 h 10 min |
| September 16 | 56°F | 36°F | 35% | 13% | 13 h 10 min |
| September 17 | 55°F | 36°F | 35% | 13% | 13 h |
| September 18 | 55°F | 35°F | 34% | 12% | 12 h 50 min |
| September 19 | 54°F | 35°F | 34% | 12% | 12 h 50 min |
| September 20 | 53°F | 35°F | 34% | 12% | 12 h 40 min |
| September 21 | 53°F | 34°F | 34% | 12% | 12 h 30 min |
| September 22 | 52°F | 34°F | 34% | 12% | 12 h 30 min |
| September 23 | 52°F | 33°F | 33% | 12% | 12 h 20 min |
| September 24 | 51°F | 33°F | 33% | 12% | 12 h 10 min |
| September 25 | 51°F | 32°F | 33% | 12% | 12 h 10 min |
| September 26 | 50°F | 32°F | 33% | 11% | 12 h |
| September 27 | 49°F | 31°F | 33% | 11% | 11 h 50 min |
| September 28 | 49°F | 31°F | 32% | 11% | 11 h 50 min |
| September 29 | 48°F | 30°F | 32% | 11% | 11 h 40 min |
| September 30 | 47°F | 30°F | 32% | 11% | 11 h 30 min |
- Normal high
- 55°FSeptember average
- Normal low
- 36°FSeptember average
- Precipitation
- 1.35 inmonth total
- Days with precipitation
- 110.01 inch or more
- Snowfall
- 2.3 inmonth total
- Nights at 32°F or colder
- 9
- Daylight
- 14 h 50 min to 11 h 30 minSeptember 1 to September 30
- Days at 70°F or more
- 2
- Sunshine
- 67%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00026411; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain or snow in Fairbanks in September?
On a given September day the chance of 0.01 inch or more is 35% on average, highest around September 1 (40%). In all, 1.35 in falls on 11 days of a normal September.
In a normal September in Fairbanks, 9 nights fall to freezing and snowfall averages 2.3 inches.
Snow falls on 1 day in a normal September, and an inch or more covers the ground on 1 day.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00026411.
How humid and windy is Fairbanks in September?
At 3 p.m. the normal temperature is 45°F with 55% relative humidity and a dew point of 30°F; at 6 a.m. it is 32°F with 83% humidity. The wind averages 4.5 mph, most often from the east-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. | 32°F | 28°F | 83% | 3.8 mph | – |
| 9 a.m. | 35°F | 29°F | 80% | 3.8 mph | 12% |
| noon | 42°F | 30°F | 63% | 5.0 mph | – |
| 3 p.m. | 45°F | 30°F | 55% | 5.4 mph | 12% |
| 6 p.m. | 42°F | 30°F | 63% | 5.0 mph | – |
| 9 p.m. | 37°F | 30°F | 76% | 4.3 mph | 17% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00026411. 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 Fairbanks?
The warmest September temperature on Fairbanks's official record (since 1904) is 84°F, on September 5, 1957; the coldest is 3°F, on September 30, 1992. The wettest September brought 5.61 in (1925); the snowiest, 24.4 inches (1992).
The September mean against the 1991-2020 normal of 45.8°F: 2021 44.1°F (−1.7), 2022 47.8°F (+2.0), 2023 44.7°F (−1.1), 2024 47.5°F (+1.7), 2025 46.4°F (+0.6), 2026 45.8°F (at normal). 3 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 44.1°F | −1.7°F | 0.37 in |
| 2022 | 47.8°F | +2.0°F | 1.45 in |
| 2023 | 44.7°F | −1.1°F | 0.92 in |
| 2024 | 47.5°F | +1.7°F | 1.26 in |
| 2025 | 46.4°F | +0.6°F | 1.35 in |
| 2026 | 45.8°F | at normal | 4.04 in |
Source: records: ACIS, NWS threaded record FAIthr; recent months: ACIS, station USW00026411. Records and recent months use complete months only.
How does September in Fairbanks 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; Fairbanks's is 55°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.