Eugene weather in September: Eugene, Oregon: normal highs, lows, rain and records for September
Eugene in September has a normal high of 78°F and a normal low of 48°F, a daily mean of 63°F, falling from 82°F on the 1st to 73°F by the 30th. Measurable precipitation falls on 6 days in a normal September, 1.39 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 26°C and low of 9°C, 35 mm of precipitation in September.
- NOAA stationEugene-Mahlon Sweet Field
- Station IDUSW00024221
- Location44.13°N 123.22°W
- Elevation353 ft (108 m)
- Population178,786
- Jan 48° 35°
- Feb 52° 35°
- Mar 57° 37°
- Apr 61° 40°
- May 68° 44°
- Jun 74° 48°
- Jul 84° 52°
- Aug 84° 52°
- Sep 78° 48°
- Oct 65° 42°
- Nov 53° 38°
- Dec 47° 34°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Eugene in September?
The normal high is 78°F and the normal low 48°F, for a daily mean of 62.9°F. September is 5.0°F cooler than August and 9.5°F warmer than October. September is the 3rd warmest month of the year in Eugene and the 9th wettest. Across the month the normal high falls 9°F, from 82°F on September 1 to 73°F on September 30. From one year to the next September's mean temperature typically moves about 1.6°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 61°F and 65°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 28%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 82°F | 50°F | 14% | 7% |
| September 8 | 81°F | 49°F | 17% | 9% |
| September 15 | 79°F | 48°F | 20% | 11% |
| September 22 | 76°F | 47°F | 24% | 13% |
| September 30 | 73°F | 45°F | 28% | 16% |
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 | 82°F | 50°F | 14% | 7% | 13 h 20 min |
| September 2 | 82°F | 50°F | 15% | 7% | 13 h 10 min |
| September 3 | 82°F | 50°F | 15% | 8% | 13 h 10 min |
| September 4 | 81°F | 50°F | 15% | 8% | 13 h 10 min |
| September 5 | 81°F | 50°F | 16% | 8% | 13 h 10 min |
| September 6 | 81°F | 50°F | 16% | 8% | 13 h |
| September 7 | 81°F | 49°F | 17% | 9% | 13 h |
| September 8 | 81°F | 49°F | 17% | 9% | 13 h |
| September 9 | 80°F | 49°F | 18% | 9% | 12 h 50 min |
| September 10 | 80°F | 49°F | 18% | 9% | 12 h 50 min |
| September 11 | 80°F | 49°F | 18% | 10% | 12 h 50 min |
| September 12 | 80°F | 49°F | 19% | 10% | 12 h 40 min |
| September 13 | 79°F | 48°F | 19% | 10% | 12 h 40 min |
| September 14 | 79°F | 48°F | 20% | 10% | 12 h 40 min |
| September 15 | 79°F | 48°F | 20% | 11% | 12 h 40 min |
| September 16 | 78°F | 48°F | 21% | 11% | 12 h 30 min |
| September 17 | 78°F | 48°F | 22% | 11% | 12 h 30 min |
| September 18 | 78°F | 48°F | 22% | 12% | 12 h 30 min |
| September 19 | 77°F | 47°F | 22% | 12% | 12 h 20 min |
| September 20 | 77°F | 47°F | 23% | 12% | 12 h 20 min |
| September 21 | 77°F | 47°F | 23% | 13% | 12 h 20 min |
| September 22 | 76°F | 47°F | 24% | 13% | 12 h 10 min |
| September 23 | 76°F | 46°F | 25% | 13% | 12 h 10 min |
| September 24 | 75°F | 46°F | 25% | 14% | 12 h 10 min |
| September 25 | 75°F | 46°F | 26% | 14% | 12 h 10 min |
| September 26 | 74°F | 46°F | 26% | 14% | 12 h |
| September 27 | 74°F | 46°F | 27% | 15% | 12 h |
| September 28 | 74°F | 45°F | 27% | 15% | 12 h |
| September 29 | 73°F | 45°F | 28% | 15% | 11 h 50 min |
| September 30 | 73°F | 45°F | 28% | 16% | 11 h 50 min |
- Normal high
- 78°FSeptember average
- Normal low
- 48°FSeptember average
- Precipitation
- 1.39 inmonth total
- Days with precipitation
- 60.01 inch or more
- Days at 90°F or more
- 2
- Daylight
- 13 h 20 min to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 25
- Days at 80°F or more
- 12
- Sunshine
- 81%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00024221; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Eugene in September?
On a given September day the chance of 0.01 inch or more is 21% on average, highest around September 30 (28%). In all, 1.39 in falls on 6 days of a normal September.
In a normal September in Eugene, 2 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00024221.
How humid and windy is Eugene in September?
At 3 p.m. the normal temperature is 71°F with 45% relative humidity and a dew point of 48°F; at 6 a.m. it is 48°F with 91% humidity. The wind averages 6.4 mph, most often from the north-northwest 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 | 45°F | 91% | 4.0 mph | – |
| 9 a.m. | 57°F | 49°F | 76% | 6.1 mph | – |
| noon | 66°F | 49°F | 54% | 8.2 mph | 52% |
| 3 p.m. | 71°F | 48°F | 45% | 9.7 mph | 57% |
| 6 p.m. | 64°F | 49°F | 57% | 7.5 mph | 58% |
| 9 p.m. | 56°F | 49°F | 76% | 5.7 mph | 68% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00024221. 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 Eugene?
The warmest September temperature on Eugene's official record (since 1893) is 103°F, on September 2, 1988; the coldest is 30°F, on September 24, 1926. The wettest September brought 7.08 in (2013).
The September mean against the 1991-2020 normal of 62.9°F: 2021 64.2°F (+1.3), 2022 65.7°F (+2.8), 2023 63.7°F (+0.8), 2024 64.7°F (+1.8), 2025 64.8°F (+1.9), 2026 60.0°F (−2.9). 5 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 64.2°F | +1.3°F | 2.55 in |
| 2022 | 65.7°F | +2.8°F | 0.13 in |
| 2023 | 63.7°F | +0.8°F | 1.66 in |
| 2024 | 64.7°F | +1.8°F | 0.94 in |
| 2025 | 64.8°F | +1.9°F | 0.74 in |
| 2026 | 60.0°F | −2.9°F | 2.76 in |
Source: records: ACIS, NWS threaded record EUGthr; recent months: ACIS, station USW00024221. Records and recent months use complete months only.
How does September in Eugene 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; Eugene's is 78°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.