Coos Bay weather in September: Coos Bay, Oregon: normal highs, lows, rain and records for September
Coos Bay in September has a normal high of 66°F and a normal low of 47°F, a daily mean of 56°F, holding near 66°F all month. Measurable precipitation falls on 8 days in a normal September, 1.77 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 19°C and low of 8°C, 45 mm of precipitation in September.
- NOAA stationCoos Bay (8 mi SW)
- Station IDUSW00004141
- Location43.27°N 124.32°W
- Elevation12 ft (4 m)
- Population15,801
- Jan 52° 36°
- Feb 54° 37°
- Mar 56° 38°
- Apr 57° 39°
- May 60° 44°
- Jun 62° 47°
- Jul 64° 51°
- Aug 66° 50°
- Sep 66° 47°
- Oct 63° 42°
- Nov 56° 39°
- Dec 51° 36°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Coos Bay in September?
The normal high is 66°F and the normal low 47°F, for a daily mean of 56.3°F. September is 1.7°F cooler than August and 4.1°F warmer than October. September is the 3rd warmest month of the year in Coos Bay and the 10th wettest. Across the month the normal high falls 2°F, from 67°F on September 1 to 65°F on September 30. From one year to the next September's mean temperature typically moves about 2.0°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 54°F and 58°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 36%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 67°F | 49°F | 26% | 8% |
| September 8 | 67°F | 48°F | 26% | 11% |
| September 15 | 66°F | 47°F | 29% | 14% |
| September 22 | 66°F | 46°F | 32% | 17% |
| September 30 | 65°F | 44°F | 36% | 21% |
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 | 67°F | 49°F | 26% | 8% | 13 h 10 min |
| September 2 | 67°F | 49°F | 26% | 8% | 13 h 10 min |
| September 3 | 67°F | 48°F | 25% | 9% | 13 h 10 min |
| September 4 | 67°F | 48°F | 26% | 9% | 13 h 10 min |
| September 5 | 67°F | 48°F | 26% | 9% | 13 h |
| September 6 | 67°F | 48°F | 26% | 10% | 13 h |
| September 7 | 67°F | 48°F | 26% | 10% | 13 h |
| September 8 | 67°F | 48°F | 26% | 11% | 12 h 50 min |
| September 9 | 67°F | 48°F | 27% | 11% | 12 h 50 min |
| September 10 | 67°F | 47°F | 27% | 11% | 12 h 50 min |
| September 11 | 67°F | 47°F | 27% | 12% | 12 h 50 min |
| September 12 | 66°F | 47°F | 27% | 12% | 12 h 40 min |
| September 13 | 66°F | 47°F | 28% | 13% | 12 h 40 min |
| September 14 | 66°F | 47°F | 28% | 13% | 12 h 40 min |
| September 15 | 66°F | 47°F | 29% | 14% | 12 h 30 min |
| September 16 | 66°F | 47°F | 29% | 14% | 12 h 30 min |
| September 17 | 66°F | 46°F | 30% | 15% | 12 h 30 min |
| September 18 | 66°F | 46°F | 30% | 15% | 12 h 30 min |
| September 19 | 66°F | 46°F | 30% | 16% | 12 h 20 min |
| September 20 | 66°F | 46°F | 31% | 16% | 12 h 20 min |
| September 21 | 66°F | 46°F | 31% | 17% | 12 h 20 min |
| September 22 | 66°F | 46°F | 32% | 17% | 12 h 10 min |
| September 23 | 66°F | 45°F | 32% | 17% | 12 h 10 min |
| September 24 | 66°F | 45°F | 32% | 18% | 12 h 10 min |
| September 25 | 66°F | 45°F | 33% | 18% | 12 h 10 min |
| September 26 | 66°F | 45°F | 33% | 19% | 12 h |
| September 27 | 65°F | 45°F | 34% | 19% | 12 h |
| September 28 | 65°F | 45°F | 34% | 20% | 12 h |
| September 29 | 65°F | 44°F | 35% | 20% | 11 h 50 min |
| September 30 | 65°F | 44°F | 36% | 21% | 11 h 50 min |
- Normal high
- 66°FSeptember average
- Normal low
- 47°FSeptember average
- Precipitation
- 1.77 inmonth total
- Days with precipitation
- 80.01 inch or more
- Daylight
- 13 h 10 min to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 8
- Days at 80°F or more
- 1
- Sunshine
- 78%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00004141; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Coos Bay in September?
On a given September day the chance of 0.01 inch or more is 29% on average, highest around September 30 (36%). In all, 1.77 in falls on 8 days of a normal September.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00004141.
What are the records for September in Coos Bay?
The September mean against the 1991-2020 normal of 56.3°F: 2022 58.0°F (+1.7), 2023 56.8°F (+0.5), 2024 58.3°F (+2.0), 2025 57.3°F (+1.0), 2026 57.4°F (+1.1). 5 of 5 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2022 | 58.0°F | +1.7°F | 0.84 in |
| 2023 | 56.8°F | +0.5°F | 2.64 in |
| 2024 | 58.3°F | +2.0°F | 1.08 in |
| 2025 | 57.3°F | +1.0°F | 2.60 in |
| 2026 | 57.4°F | +1.1°F | 1.28 in |
Source: recent months: ACIS, station USW00004141. Records and recent months use complete months only.
How does September in Coos Bay compare across Oregon?
Across the 105 places PlainClimate covers in Oregon, September normal highs run from 64°F in Newport to 87°F in Cave Junction; Coos Bay's is 66°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.