Seaside weather in September: Seaside, Oregon: normal highs, lows, rain and records for September
Seaside in September has a normal high of 67°F and a normal low of 50°F, a daily mean of 58°F, falling from 67°F on the 1st to 65°F by the 30th. Measurable precipitation falls on 9 days in a normal September, 2.91 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 19°C and low of 10°C, 74 mm of precipitation in September.
- NOAA stationSeaside
- Station IDUSC00357641
- Location45.99°N 123.92°W
- Elevation10 ft (3 m)
- Population7,110
- Jan 52° 39°
- Feb 53° 38°
- Mar 54° 40°
- Apr 56° 42°
- May 60° 46°
- Jun 62° 50°
- Jul 65° 53°
- Aug 66° 54°
- Sep 67° 50°
- Oct 62° 46°
- Nov 55° 42°
- Dec 51° 39°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Seaside in September?
The normal high is 67°F and the normal low 50°F, for a daily mean of 58.3°F. September is 1.7°F cooler than August and 4.7°F warmer than October. September is the 3rd warmest month of the year in Seaside and the 9th 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 1.8°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 57°F and 60°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 38%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 67°F | 52°F | 26% | 13% |
| September 8 | 67°F | 51°F | 28% | 15% |
| September 15 | 67°F | 50°F | 31% | 18% |
| September 22 | 66°F | 49°F | 34% | 20% |
| September 30 | 65°F | 48°F | 38% | 24% |
Every day of September: normal high, low and chance of precipitation (warmest afternoon September 3, coldest night September 30)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| September 1 | 67°F | 52°F | 26% | 13% | 13 h 20 min |
| September 2 | 67°F | 52°F | 26% | 13% | 13 h 20 min |
| September 3 | 67°F | 52°F | 27% | 13% | 13 h 20 min |
| September 4 | 67°F | 52°F | 27% | 14% | 13 h 10 min |
| September 5 | 67°F | 52°F | 27% | 14% | 13 h 10 min |
| September 6 | 67°F | 52°F | 27% | 14% | 13 h 10 min |
| September 7 | 67°F | 52°F | 28% | 14% | 13 h |
| September 8 | 67°F | 51°F | 28% | 15% | 13 h |
| September 9 | 67°F | 51°F | 28% | 15% | 13 h |
| September 10 | 67°F | 51°F | 28% | 16% | 12 h 50 min |
| September 11 | 67°F | 51°F | 29% | 16% | 12 h 50 min |
| September 12 | 67°F | 51°F | 29% | 16% | 12 h 50 min |
| September 13 | 67°F | 51°F | 30% | 17% | 12 h 40 min |
| September 14 | 67°F | 50°F | 30% | 17% | 12 h 40 min |
| September 15 | 67°F | 50°F | 31% | 18% | 12 h 40 min |
| September 16 | 67°F | 50°F | 31% | 18% | 12 h 30 min |
| September 17 | 67°F | 50°F | 32% | 19% | 12 h 30 min |
| September 18 | 67°F | 50°F | 32% | 19% | 12 h 30 min |
| September 19 | 67°F | 50°F | 33% | 19% | 12 h 20 min |
| September 20 | 67°F | 49°F | 33% | 20% | 12 h 20 min |
| September 21 | 66°F | 49°F | 33% | 20% | 12 h 20 min |
| September 22 | 66°F | 49°F | 34% | 20% | 12 h 10 min |
| September 23 | 66°F | 49°F | 34% | 21% | 12 h 10 min |
| September 24 | 66°F | 49°F | 35% | 21% | 12 h 10 min |
| September 25 | 66°F | 49°F | 36% | 22% | 12 h 10 min |
| September 26 | 66°F | 48°F | 36% | 22% | 12 h |
| September 27 | 66°F | 48°F | 37% | 23% | 12 h |
| September 28 | 66°F | 48°F | 37% | 23% | 12 h |
| September 29 | 65°F | 48°F | 38% | 24% | 11 h 50 min |
| September 30 | 65°F | 48°F | 38% | 24% | 11 h 50 min |
- Normal high
- 67°FSeptember average
- Normal low
- 50°FSeptember average
- Precipitation
- 2.91 inmonth total
- Days with precipitation
- 90.01 inch or more
- Daylight
- 13 h 20 min to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 6
- Days at 80°F or more
- 2
- Sunshine
- 78%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00357641; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Seaside in September?
On a given September day the chance of 0.01 inch or more is 31% on average, highest around September 30 (38%). In all, 2.91 in falls on 9 days of a normal September, 1 of them with an inch or more.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00357641.
What are the records for September in Seaside?
The warmest September temperature on this station's record (since 1930) is 95°F, on September 23, 1943; the coldest is 30°F, on September 8, 1983. The wettest September brought 10.36 in (2013).
The September mean against the 1991-2020 normal of 58.3°F: 2025 59.9°F (+1.6). 1 of 1 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2025 | 59.9°F | +1.6°F | 1.73 in |
Source: records: ACIS, station USC00357641; recent months: ACIS, station USC00357641. Records and recent months use complete months only.
How does September in Seaside 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; Seaside's is 67°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.