Astoria weather in September: Astoria, Oregon: normal highs, lows, rain and records for September
Astoria in September has a normal high of 68°F and a normal low of 51°F, a daily mean of 59°F, falling from 69°F on the 1st to 65°F by the 30th. Measurable precipitation falls on 10 days in a normal September, 2.67 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 20°C and low of 10°C, 68 mm of precipitation in September.
- NOAA stationAstoria Regional Airport
- Station IDUSW00094224
- Location46.16°N 123.88°W
- Elevation9 ft (3 m)
- Population9,906
- Jan 49° 38°
- Feb 51° 37°
- Mar 53° 39°
- Apr 56° 42°
- May 61° 46°
- Jun 64° 51°
- Jul 67° 54°
- Aug 69° 54°
- Sep 68° 51°
- Oct 61° 45°
- Nov 54° 40°
- Dec 49° 38°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Astoria in September?
The normal high is 68°F and the normal low 51°F, for a daily mean of 59.0°F. September is 2.3°F cooler than August and 6.2°F warmer than October. September is the 3rd warmest month of the year in Astoria and the 9th wettest. Across the month the normal high falls 4°F, from 69°F on September 1 to 65°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 57°F and 61°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 42%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 69°F | 53°F | 30% | 13% |
| September 8 | 69°F | 52°F | 32% | 16% |
| September 15 | 68°F | 51°F | 35% | 19% |
| September 22 | 67°F | 50°F | 38% | 22% |
| September 30 | 65°F | 48°F | 42% | 27% |
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 | 69°F | 53°F | 30% | 13% | 13 h 20 min |
| September 2 | 69°F | 53°F | 30% | 14% | 13 h 20 min |
| September 3 | 69°F | 52°F | 31% | 14% | 13 h 20 min |
| September 4 | 69°F | 52°F | 31% | 14% | 13 h 10 min |
| September 5 | 69°F | 52°F | 31% | 15% | 13 h 10 min |
| September 6 | 69°F | 52°F | 32% | 15% | 13 h 10 min |
| September 7 | 69°F | 52°F | 32% | 15% | 13 h |
| September 8 | 69°F | 52°F | 32% | 16% | 13 h |
| September 9 | 69°F | 52°F | 33% | 16% | 13 h |
| September 10 | 69°F | 52°F | 33% | 17% | 12 h 50 min |
| September 11 | 69°F | 51°F | 33% | 17% | 12 h 50 min |
| September 12 | 68°F | 51°F | 34% | 18% | 12 h 50 min |
| September 13 | 68°F | 51°F | 34% | 18% | 12 h 40 min |
| September 14 | 68°F | 51°F | 34% | 19% | 12 h 40 min |
| September 15 | 68°F | 51°F | 35% | 19% | 12 h 40 min |
| September 16 | 68°F | 51°F | 35% | 19% | 12 h 30 min |
| September 17 | 68°F | 50°F | 36% | 20% | 12 h 30 min |
| September 18 | 68°F | 50°F | 36% | 20% | 12 h 30 min |
| September 19 | 67°F | 50°F | 36% | 21% | 12 h 20 min |
| September 20 | 67°F | 50°F | 37% | 21% | 12 h 20 min |
| September 21 | 67°F | 50°F | 37% | 22% | 12 h 20 min |
| September 22 | 67°F | 50°F | 38% | 22% | 12 h 10 min |
| September 23 | 67°F | 49°F | 38% | 23% | 12 h 10 min |
| September 24 | 66°F | 49°F | 39% | 23% | 12 h 10 min |
| September 25 | 66°F | 49°F | 39% | 24% | 12 h 10 min |
| September 26 | 66°F | 49°F | 40% | 24% | 12 h |
| September 27 | 66°F | 49°F | 40% | 25% | 12 h |
| September 28 | 65°F | 48°F | 41% | 25% | 12 h |
| September 29 | 65°F | 48°F | 42% | 26% | 11 h 50 min |
| September 30 | 65°F | 48°F | 42% | 27% | 11 h 50 min |
- Normal high
- 68°FSeptember average
- Normal low
- 51°FSeptember average
- Precipitation
- 2.67 inmonth total
- Days with precipitation
- 100.01 inch or more
- Daylight
- 13 h 20 min to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 9
- Days at 80°F or more
- 2
- Sunshine
- 75%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00094224; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Astoria in September?
On a given September day the chance of 0.01 inch or more is 35% on average, highest around September 30 (42%). In all, 2.67 in falls on 10 days of a normal September, 1 of them with an inch or more.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00094224.
How humid and windy is Astoria in September?
At 3 p.m. the normal temperature is 63°F with 67% relative humidity and a dew point of 52°F; at 6 a.m. it is 51°F with 92% humidity. The wind averages 6.5 mph, most often from the west in the afternoon.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 51°F | 49°F | 92% | 4.6 mph | – |
| 9 a.m. | 57°F | 52°F | 83% | 6.0 mph | – |
| noon | 63°F | 52°F | 68% | 9.2 mph | 54% |
| 3 p.m. | 63°F | 52°F | 67% | 10.6 mph | 60% |
| 6 p.m. | 58°F | 52°F | 79% | 7.6 mph | – |
| 9 p.m. | 55°F | 51°F | 88% | 5.1 mph | – |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00094224. 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 Astoria?
The warmest September temperature on Astoria's official record (since 1887) is 95°F, on September 2, 1972; the coldest is 33°F, on September 13, 1970. The wettest September brought 10.69 in (2013).
The September mean against the 1991-2020 normal of 59.0°F: 2021 58.9°F (−0.1), 2022 61.2°F (+2.2), 2023 59.1°F (+0.1), 2024 61.9°F (+2.9), 2025 60.7°F (+1.7), 2026 58.3°F (−0.7). 4 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 58.9°F | −0.1°F | 5.00 in |
| 2022 | 61.2°F | +2.2°F | 0.74 in |
| 2023 | 59.1°F | +0.1°F | 3.36 in |
| 2024 | 61.9°F | +2.9°F | 1.38 in |
| 2025 | 60.7°F | +1.7°F | 2.17 in |
| 2026 | 58.3°F | −0.7°F | 3.40 in |
Source: records: ACIS, NWS threaded record ASTthr; recent months: ACIS, station USW00094224. Records and recent months use complete months only.
How does September in Astoria 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; Astoria's is 68°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.