McGrath weather in September: McGrath, Alaska: normal highs, lows, rain and records for September
McGrath in September has a normal high of 54°F and a normal low of 38°F, a daily mean of 46°F, falling from 60°F on the 1st to 46°F by the 30th. Measurable precipitation falls on 14 days in a normal September, 2.53 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 12°C and low of 3°C, 64 mm of precipitation and 4 cm of snow in September.
- NOAA stationMcGrath Airport
- Station IDUSW00026510
- Location62.96°N 155.61°W
- Elevation333 ft (102 m)
- Population284
- Jan 3° -14°
- Feb 15° -6°
- Mar 25° -1°
- Apr 43° 22°
- May 59° 38°
- Jun 69° 49°
- Jul 70° 52°
- Aug 64° 48°
- Sep 54° 38°
- Oct 35° 22°
- Nov 15° 1°
- Dec 6° -10°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is McGrath in September?
The normal high is 54°F and the normal low 38°F, for a daily mean of 46.0°F. September is 9.9°F cooler than August and 17.6°F warmer than October. September is the 5th warmest month of the year in McGrath and the 2nd wettest. Across the month the normal high falls 14°F, from 60°F on September 1 to 46°F on September 30. From one year to the next September's mean temperature typically moves about 3.5°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 43°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 49%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 60°F | 43°F | 49% | 26% |
| September 8 | 58°F | 41°F | 48% | 25% |
| September 15 | 55°F | 38°F | 47% | 24% |
| September 22 | 51°F | 36°F | 45% | 22% |
| September 30 | 46°F | 32°F | 43% | 20% |
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 | 60°F | 43°F | 49% | 26% | 14 h 30 min |
| September 2 | 60°F | 43°F | 49% | 25% | 14 h 30 min |
| September 3 | 60°F | 43°F | 49% | 25% | 14 h 20 min |
| September 4 | 59°F | 42°F | 49% | 25% | 14 h 10 min |
| September 5 | 59°F | 42°F | 49% | 25% | 14 h 10 min |
| September 6 | 59°F | 42°F | 49% | 25% | 14 h |
| September 7 | 58°F | 41°F | 49% | 25% | 14 h |
| September 8 | 58°F | 41°F | 48% | 25% | 13 h 50 min |
| September 9 | 57°F | 41°F | 48% | 24% | 13 h 40 min |
| September 10 | 57°F | 40°F | 48% | 24% | 13 h 40 min |
| September 11 | 56°F | 40°F | 48% | 24% | 13 h 30 min |
| September 12 | 56°F | 39°F | 48% | 24% | 13 h 30 min |
| September 13 | 56°F | 39°F | 47% | 24% | 13 h 20 min |
| September 14 | 55°F | 39°F | 47% | 24% | 13 h 10 min |
| September 15 | 55°F | 38°F | 47% | 24% | 13 h 10 min |
| September 16 | 54°F | 38°F | 47% | 23% | 13 h |
| September 17 | 54°F | 38°F | 47% | 23% | 13 h |
| September 18 | 53°F | 37°F | 46% | 23% | 12 h 50 min |
| September 19 | 53°F | 37°F | 46% | 23% | 12 h 40 min |
| September 20 | 52°F | 36°F | 46% | 23% | 12 h 40 min |
| September 21 | 52°F | 36°F | 46% | 23% | 12 h 30 min |
| September 22 | 51°F | 36°F | 45% | 22% | 12 h 20 min |
| September 23 | 50°F | 35°F | 45% | 22% | 12 h 20 min |
| September 24 | 50°F | 35°F | 45% | 22% | 12 h 10 min |
| September 25 | 49°F | 34°F | 44% | 21% | 12 h 10 min |
| September 26 | 49°F | 34°F | 44% | 21% | 12 h |
| September 27 | 48°F | 34°F | 44% | 21% | 11 h 50 min |
| September 28 | 47°F | 33°F | 43% | 21% | 11 h 50 min |
| September 29 | 47°F | 33°F | 43% | 20% | 11 h 40 min |
| September 30 | 46°F | 32°F | 43% | 20% | 11 h 40 min |
- Normal high
- 54°FSeptember average
- Normal low
- 38°FSeptember average
- Precipitation
- 2.53 inmonth total
- Days with precipitation
- 140.01 inch or more
- Snowfall
- 1.4 inmonth total
- Nights at 32°F or colder
- 9
- Daylight
- 14 h 30 min to 11 h 40 minSeptember 1 to September 30
- Days at 70°F or more
- 1
- Sunshine
- 62%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00026510; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain or snow in McGrath in September?
On a given September day the chance of 0.01 inch or more is 47% on average, highest around September 1 (49%). In all, 2.53 in falls on 14 days of a normal September.
In a normal September in McGrath, 9 nights fall to freezing and snowfall averages 1.4 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 USW00026510.
How humid and windy is McGrath in September?
At 3 p.m. the normal temperature is 44°F with 62% relative humidity and a dew point of 32°F; at 6 a.m. it is 34°F with 86% humidity. The wind averages 4.9 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. | 34°F | 30°F | 86% | 4.1 mph | – |
| 9 a.m. | 34°F | 30°F | 85% | 4.2 mph | 17% |
| noon | 40°F | 32°F | 72% | 5.4 mph | 19% |
| 3 p.m. | 44°F | 32°F | 62% | 6.4 mph | 16% |
| 6 p.m. | 43°F | 32°F | 65% | 6.1 mph | 23% |
| 9 p.m. | 38°F | 32°F | 77% | 4.4 mph | 22% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00026510. 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 McGrath?
The warmest September temperature on McGrath's official record (since 1941) is 76°F, on September 3, 1949; the coldest is 2°F, on September 24, 1992. The wettest September brought 6.18 in (1993); the snowiest, 13.7 inches (1992).
The September mean against the 1991-2020 normal of 46.0°F: 2022 47.3°F (+1.3), 2023 43.2°F (−2.8), 2024 45.5°F (−0.5), 2025 45.1°F (−0.9), 2026 46.3°F (+0.3). 2 of 5 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2022 | 47.3°F | +1.3°F | 2.82 in |
| 2023 | 43.2°F | −2.8°F | 1.78 in |
| 2024 | 45.5°F | −0.5°F | 2.35 in |
| 2025 | 45.1°F | −0.9°F | 2.16 in |
| 2026 | 46.3°F | +0.3°F | 3.26 in |
Source: records: ACIS, NWS threaded record MCGthr; recent months: ACIS, station USW00026510. Records and recent months use complete months only.
How does September in McGrath 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; McGrath's is 54°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.