Klamath Falls weather in September: Klamath Falls, Oregon: normal highs, lows, rain and records for September
Klamath Falls in September has a normal high of 78°F and a normal low of 39°F, a daily mean of 58°F, falling from 82°F on the 1st to 72°F by the 30th. Measurable precipitation falls on 3 days in a normal September, 0.30 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 25°C and low of 4°C, 8 mm of precipitation in September.
- NOAA stationKlamath Falls International Airport
- Station IDUSW00094236
- Location42.15°N 121.72°W
- Elevation4,084 ft (1,245 m)
- Population22,174
- Jan 42° 22°
- Feb 46° 24°
- Mar 52° 27°
- Apr 58° 29°
- May 67° 36°
- Jun 76° 41°
- Jul 86° 48°
- Aug 85° 47°
- Sep 78° 39°
- Oct 64° 31°
- Nov 49° 25°
- Dec 40° 21°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Klamath Falls in September?
The normal high is 78°F and the normal low 39°F, for a daily mean of 58.2°F. September is 7.4°F cooler than August and 10.8°F warmer than October. September is the 4th warmest month of the year in Klamath Falls and the 10th wettest. Across the month the normal high falls 10°F, from 82°F on September 1 to 72°F on September 30. From one year to the next September's mean temperature typically moves about 2.3°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 56°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 12%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 82°F | 43°F | 7% | 3% |
| September 8 | 80°F | 41°F | 8% | 3% |
| September 15 | 78°F | 39°F | 9% | 3% |
| September 22 | 76°F | 37°F | 10% | 4% |
| September 30 | 72°F | 35°F | 12% | 5% |
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 | 43°F | 7% | 3% | 13 h 10 min |
| September 2 | 82°F | 43°F | 7% | 3% | 13 h 10 min |
| September 3 | 81°F | 42°F | 7% | 3% | 13 h 10 min |
| September 4 | 81°F | 42°F | 7% | 3% | 13 h |
| September 5 | 81°F | 42°F | 8% | 3% | 13 h |
| September 6 | 81°F | 42°F | 8% | 3% | 13 h |
| September 7 | 80°F | 41°F | 8% | 3% | 13 h |
| September 8 | 80°F | 41°F | 8% | 3% | 12 h 50 min |
| September 9 | 80°F | 41°F | 8% | 3% | 12 h 50 min |
| September 10 | 80°F | 41°F | 8% | 3% | 12 h 50 min |
| September 11 | 79°F | 40°F | 8% | 3% | 12 h 40 min |
| September 12 | 79°F | 40°F | 9% | 3% | 12 h 40 min |
| September 13 | 79°F | 40°F | 9% | 3% | 12 h 40 min |
| September 14 | 78°F | 40°F | 9% | 3% | 12 h 40 min |
| September 15 | 78°F | 39°F | 9% | 3% | 12 h 30 min |
| September 16 | 78°F | 39°F | 9% | 3% | 12 h 30 min |
| September 17 | 77°F | 39°F | 10% | 3% | 12 h 30 min |
| September 18 | 77°F | 38°F | 10% | 3% | 12 h 20 min |
| September 19 | 77°F | 38°F | 10% | 4% | 12 h 20 min |
| September 20 | 76°F | 38°F | 10% | 4% | 12 h 20 min |
| September 21 | 76°F | 38°F | 10% | 4% | 12 h 20 min |
| September 22 | 76°F | 37°F | 10% | 4% | 12 h 10 min |
| September 23 | 75°F | 37°F | 11% | 4% | 12 h 10 min |
| September 24 | 75°F | 37°F | 11% | 4% | 12 h 10 min |
| September 25 | 74°F | 36°F | 11% | 4% | 12 h 10 min |
| September 26 | 74°F | 36°F | 11% | 5% | 12 h |
| September 27 | 73°F | 36°F | 11% | 5% | 12 h |
| September 28 | 73°F | 35°F | 12% | 5% | 12 h |
| September 29 | 73°F | 35°F | 12% | 5% | 11 h 50 min |
| September 30 | 72°F | 35°F | 12% | 5% | 11 h 50 min |
- Normal high
- 78°FSeptember average
- Normal low
- 39°FSeptember average
- Precipitation
- 0.30 inmonth total
- Days with precipitation
- 30.01 inch or more
- Days at 90°F or more
- 1
- Nights at 32°F or colder
- 3
- Daylight
- 13 h 10 min to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 23
- Days at 80°F or more
- 14
- Sunshine
- 90%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00094236; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Klamath Falls in September?
On a given September day the chance of 0.01 inch or more is 9% on average, highest around September 30 (12%). In all, 0.30 in falls on 3 days of a normal September.
In a normal September in Klamath Falls, 1 days reach 90°F and 3 nights fall to freezing.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00094236.
How humid and windy is Klamath Falls in September?
At 3 p.m. the normal temperature is 70°F with 26% relative humidity and a dew point of 33°F; at 6 a.m. it is 40°F with 81% humidity. The wind averages 5.2 mph, most often from the west in the afternoon. A dew point under 50°F feels dry.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 40°F | 34°F | 81% | 2.8 mph | 66% |
| 9 a.m. | 54°F | 38°F | 55% | 5.1 mph | 63% |
| noon | 66°F | 36°F | 33% | 6.3 mph | 60% |
| 3 p.m. | 70°F | 33°F | 26% | 8.8 mph | 59% |
| 6 p.m. | 61°F | 36°F | 39% | 7.9 mph | 61% |
| 9 p.m. | 51°F | 37°F | 60% | 4.7 mph | 73% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00094236. 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 Klamath Falls?
The warmest September temperature on Klamath Falls's official record (since 1897) is 103°F, on September 9, 1902; the coldest is 20°F, on September 24, 1973. The wettest September brought 2.74 in (1957).
The September mean against the 1991-2020 normal of 58.2°F: 2021 58.0°F (−0.2), 2022 61.0°F (+2.8), 2023 55.6°F (−2.6), 2024 61.5°F (+3.3), 2025 59.7°F (+1.5), 2026 54.5°F (−3.7). 3 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 58.0°F | −0.2°F | 0.39 in |
| 2022 | 61.0°F | +2.8°F | 0.72 in |
| 2023 | 55.6°F | −2.6°F | 1.04 in |
| 2024 | 61.5°F | +3.3°F | 0.28 in |
| 2025 | 59.7°F | +1.5°F | 0.75 in |
| 2026 | 54.5°F | −3.7°F | 0.83 in |
Source: records: ACIS, NWS threaded record LMTthr; recent months: ACIS, station USW00094236. Records and recent months use complete months only.
How does September in Klamath Falls 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; Klamath Falls's is 78°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- Klamath Falls in August85°F by day, 47°F at night
- Klamath Falls in October64°F by day, 31°F at night
- Klamath Falls through the yearEvery month, frost dates, records and recent years
- Oregon in SeptemberThe statewide normal and the warmest and coolest places
- Cave Junction: Oregon's warmest Septembernormal high 87°F