Delta Junction weather in September: Delta Junction, Alaska: normal highs, lows, rain and records for September
Delta Junction in September has a normal high of 53°F and a normal low of 36°F, a daily mean of 45°F, falling from 60°F on the 1st to 45°F by the 30th. Measurable precipitation falls on 9 days in a normal September, 0.90 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 12°C and low of 2°C, 23 mm of precipitation in September.
- NOAA stationBig Delta Airport
- Station IDUSW00026415
- Location63.99°N 145.72°W
- Elevation1,277 ft (389 m)
- Population985
- Jan 6° -8°
- Feb 16° -1°
- Mar 25° 4°
- Apr 44° 24°
- May 59° 38°
- Jun 68° 49°
- Jul 70° 52°
- Aug 65° 47°
- Sep 53° 36°
- Oct 33° 20°
- Nov 15° 1°
- Dec 9° -5°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Delta Junction in September?
The normal high is 53°F and the normal low 36°F, for a daily mean of 44.8°F. September is 10.8°F cooler than August and 18.3°F warmer than October. September is the 5th warmest month of the year in Delta Junction and the 4th wettest. Across the month the normal high falls 15°F, from 60°F on September 1 to 45°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 41°F and 49°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 35%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 60°F | 42°F | 35% | 13% |
| September 8 | 57°F | 39°F | 32% | 11% |
| September 15 | 54°F | 37°F | 29% | 10% |
| September 22 | 50°F | 34°F | 27% | 8% |
| September 30 | 45°F | 30°F | 26% | 7% |
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 | 42°F | 35% | 13% | 14 h 40 min |
| September 2 | 60°F | 42°F | 35% | 13% | 14 h 30 min |
| September 3 | 59°F | 41°F | 34% | 13% | 14 h 30 min |
| September 4 | 59°F | 41°F | 34% | 12% | 14 h 20 min |
| September 5 | 58°F | 40°F | 33% | 12% | 14 h 10 min |
| September 6 | 58°F | 40°F | 33% | 12% | 14 h 10 min |
| September 7 | 58°F | 40°F | 32% | 11% | 14 h |
| September 8 | 57°F | 39°F | 32% | 11% | 14 h |
| September 9 | 57°F | 39°F | 31% | 11% | 13 h 50 min |
| September 10 | 56°F | 39°F | 31% | 11% | 13 h 40 min |
| September 11 | 56°F | 38°F | 31% | 10% | 13 h 40 min |
| September 12 | 55°F | 38°F | 30% | 10% | 13 h 30 min |
| September 13 | 55°F | 38°F | 30% | 10% | 13 h 20 min |
| September 14 | 54°F | 37°F | 30% | 10% | 13 h 20 min |
| September 15 | 54°F | 37°F | 29% | 10% | 13 h 10 min |
| September 16 | 53°F | 36°F | 29% | 9% | 13 h |
| September 17 | 53°F | 36°F | 29% | 9% | 13 h |
| September 18 | 52°F | 36°F | 28% | 9% | 12 h 50 min |
| September 19 | 52°F | 35°F | 28% | 9% | 12 h 40 min |
| September 20 | 51°F | 35°F | 28% | 9% | 12 h 40 min |
| September 21 | 51°F | 34°F | 27% | 8% | 12 h 30 min |
| September 22 | 50°F | 34°F | 27% | 8% | 12 h 30 min |
| September 23 | 50°F | 34°F | 27% | 8% | 12 h 20 min |
| September 24 | 49°F | 33°F | 27% | 8% | 12 h 10 min |
| September 25 | 49°F | 33°F | 26% | 8% | 12 h 10 min |
| September 26 | 48°F | 32°F | 26% | 8% | 12 h |
| September 27 | 47°F | 32°F | 26% | 8% | 11 h 50 min |
| September 28 | 47°F | 31°F | 26% | 8% | 11 h 50 min |
| September 29 | 46°F | 31°F | 26% | 8% | 11 h 40 min |
| September 30 | 45°F | 30°F | 26% | 7% | 11 h 30 min |
- Normal high
- 53°FSeptember average
- Normal low
- 36°FSeptember average
- Precipitation
- 0.90 inmonth total
- Days with precipitation
- 90.01 inch or more
- Nights at 32°F or colder
- 10
- Daylight
- 14 h 40 min to 11 h 30 minSeptember 1 to September 30
- Sunshine
- 61%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00026415; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Delta Junction in September?
On a given September day the chance of 0.01 inch or more is 29% on average, highest around September 1 (35%). In all, 0.90 in falls on 9 days of a normal September.
In a normal September in Delta Junction, 10 nights fall to freezing and 1 days stay below freezing all day.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00026415.
How humid and windy is Delta Junction in September?
At 3 p.m. the normal temperature is 43°F with 57% relative humidity and a dew point of 28°F; at 6 a.m. it is 32°F with 78% humidity. The wind averages 8.5 mph, most often from the east-southeast 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 | 26°F | 78% | 7.6 mph | – |
| 9 a.m. | 34°F | 27°F | 75% | 8.0 mph | 13% |
| noon | 40°F | 28°F | 64% | 9.7 mph | – |
| 3 p.m. | 43°F | 28°F | 57% | 9.9 mph | 10% |
| 6 p.m. | 40°F | 29°F | 62% | 8.2 mph | – |
| 9 p.m. | 37°F | 28°F | 70% | 8.4 mph | – |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00026415. 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 Delta Junction?
The warmest September temperature on Delta Junction's official record (since 1917) is 79°F, on September 1, 1963; the coldest is −2°F, on September 27, 1983. The wettest September brought 3.01 in (1952); the snowiest, 14.0 inches (1981).
The September mean against the 1991-2020 normal of 44.8°F: 2021 40.2°F (−4.6), 2022 45.8°F (+1.0), 2023 42.1°F (−2.6), 2024 45.2°F (+0.4), 2026 45.2°F (+0.4). 3 of 5 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 40.2°F | −4.6°F | 0.68 in |
| 2022 | 45.8°F | +1.0°F | 1.57 in |
| 2023 | 42.1°F | −2.6°F | 1.38 in |
| 2024 | 45.2°F | +0.4°F | 1.87 in |
| 2026 | 45.2°F | +0.4°F | 1.41 in |
Source: records: ACIS, NWS threaded record BIGthr; recent months: ACIS, station USW00026415. Records and recent months use complete months only.
How does September in Delta Junction 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; Delta Junction's is 53°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- Delta Junction in August65°F by day, 47°F at night
- Delta Junction in October33°F by day, 20°F at night
- Delta Junction through the yearEvery month, frost dates, records and recent years
- Alaska in SeptemberThe statewide normal and the warmest and coolest places
- Klawock: Alaska's warmest Septembernormal high 60°F