Sitka weather in September: Sitka, Alaska: normal highs, lows, rain and records for September
Sitka in September has a normal high of 58°F and a normal low of 49°F, a daily mean of 53°F, falling from 61°F on the 1st to 55°F by the 30th. Measurable precipitation falls on 22 days in a normal September, 11.69 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 14°C and low of 9°C, 297 mm of precipitation in September.
- NOAA stationSitka Airport
- Station IDUSW00025333
- Location57.05°N 135.36°W
- Elevation14 ft (4 m)
- Population8,355
- Jan 41° 32°
- Feb 41° 32°
- Mar 43° 33°
- Apr 48° 37°
- May 53° 43°
- Jun 58° 48°
- Jul 60° 53°
- Aug 62° 53°
- Sep 58° 49°
- Oct 51° 42°
- Nov 44° 36°
- Dec 42° 33°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Sitka in September?
The normal high is 58°F and the normal low 49°F, for a daily mean of 53.2°F. September is 4.1°F cooler than August and 6.8°F warmer than October. September is the 3rd warmest month of the year in Sitka and the 2nd wettest. Across the month the normal high falls 6°F, from 61°F on September 1 to 55°F on September 30. From one year to the next September's mean temperature typically moves about 1.7°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 52°F and 55°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 78%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 61°F | 51°F | 71% | 53% |
| September 8 | 59°F | 50°F | 73% | 56% |
| September 15 | 58°F | 49°F | 74% | 58% |
| September 22 | 57°F | 47°F | 76% | 60% |
| September 30 | 55°F | 46°F | 78% | 62% |
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 | 51°F | 71% | 53% | 14 h |
| September 2 | 60°F | 51°F | 71% | 53% | 14 h |
| September 3 | 60°F | 51°F | 72% | 54% | 13 h 50 min |
| September 4 | 60°F | 51°F | 72% | 54% | 13 h 50 min |
| September 5 | 60°F | 50°F | 72% | 55% | 13 h 40 min |
| September 6 | 60°F | 50°F | 72% | 55% | 13 h 40 min |
| September 7 | 60°F | 50°F | 73% | 55% | 13 h 30 min |
| September 8 | 59°F | 50°F | 73% | 56% | 13 h 30 min |
| September 9 | 59°F | 50°F | 73% | 56% | 13 h 20 min |
| September 10 | 59°F | 50°F | 73% | 56% | 13 h 20 min |
| September 11 | 59°F | 49°F | 74% | 57% | 13 h 10 min |
| September 12 | 59°F | 49°F | 74% | 57% | 13 h 10 min |
| September 13 | 59°F | 49°F | 74% | 57% | 13 h |
| September 14 | 58°F | 49°F | 74% | 58% | 13 h |
| September 15 | 58°F | 49°F | 74% | 58% | 12 h 50 min |
| September 16 | 58°F | 49°F | 75% | 58% | 12 h 50 min |
| September 17 | 58°F | 48°F | 75% | 59% | 12 h 40 min |
| September 18 | 58°F | 48°F | 75% | 59% | 12 h 40 min |
| September 19 | 57°F | 48°F | 75% | 59% | 12 h 30 min |
| September 20 | 57°F | 48°F | 76% | 60% | 12 h 30 min |
| September 21 | 57°F | 48°F | 76% | 60% | 12 h 20 min |
| September 22 | 57°F | 47°F | 76% | 60% | 12 h 20 min |
| September 23 | 57°F | 47°F | 76% | 61% | 12 h 20 min |
| September 24 | 56°F | 47°F | 77% | 61% | 12 h 10 min |
| September 25 | 56°F | 47°F | 77% | 61% | 12 h 10 min |
| September 26 | 56°F | 47°F | 77% | 61% | 12 h |
| September 27 | 56°F | 46°F | 77% | 62% | 12 h |
| September 28 | 55°F | 46°F | 77% | 62% | 11 h 50 min |
| September 29 | 55°F | 46°F | 78% | 62% | 11 h 50 min |
| September 30 | 55°F | 46°F | 78% | 62% | 11 h 40 min |
- Normal high
- 58°FSeptember average
- Normal low
- 49°FSeptember average
- Precipitation
- 11.69 inmonth total
- Days with precipitation
- 220.01 inch or more
- Daylight
- 14 h to 11 h 40 minSeptember 1 to September 30
- Sunshine
- 52%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00025333; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Sitka in September?
On a given September day the chance of 0.01 inch or more is 74% on average, highest around September 30 (78%). In all, 11.69 in falls on 22 days of a normal September, 3 of them with an inch or more.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00025333.
How humid and windy is Sitka in September?
At 3 p.m. the normal temperature is 53°F with 76% relative humidity and a dew point of 46°F; at 6 a.m. it is 48°F with 86% humidity. The wind averages 7.4 mph, most often from the south-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. | 48°F | 44°F | 86% | 7.0 mph | – |
| 9 a.m. | 50°F | 45°F | 83% | 7.2 mph | – |
| noon | 53°F | 46°F | 77% | 8.2 mph | – |
| 3 p.m. | 53°F | 46°F | 76% | 8.4 mph | – |
| 6 p.m. | 51°F | 46°F | 81% | 7.9 mph | – |
| 9 p.m. | 49°F | 45°F | 85% | 6.9 mph | 24% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00025333. 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 Sitka?
The warmest September temperature on this station's record (since 1944) is 77°F, on September 5, 1986; the coldest is 31°F, on September 26, 1956. The wettest September brought 20.59 in (1987).
The September mean against the 1991-2020 normal of 53.2°F: 2021 54.1°F (+0.9), 2022 55.9°F (+2.7), 2023 55.3°F (+2.0), 2024 54.7°F (+1.5), 2025 57.0°F (+3.8), 2026 54.6°F (+1.4). 6 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 54.1°F | +0.9°F | 9.69 in |
| 2022 | 55.9°F | +2.7°F | 14.15 in |
| 2023 | 55.3°F | +2.0°F | 18.79 in |
| 2024 | 54.7°F | +1.5°F | 9.45 in |
| 2025 | 57.0°F | +3.8°F | 10.88 in |
| 2026 | 54.6°F | +1.4°F | 10.93 in |
Source: records: ACIS, station USW00025333; recent months: ACIS, station USW00025333. Records and recent months use complete months only.
How does September in Sitka 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; Sitka's is 58°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.