Leavenworth weather in September: Leavenworth, Washington: normal highs, lows, rain and records for September
Leavenworth in September has a normal high of 78°F and a normal low of 42°F, a daily mean of 60°F, falling from 83°F on the 1st to 72°F by the 30th. Measurable precipitation falls on 4 days in a normal September, 0.76 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 26°C and low of 5°C, 19 mm of precipitation in September.
- NOAA stationLeavenworth (3 mi S)
- Station IDUSC00454572
- Location47.56°N 120.67°W
- Elevation1,128 ft (344 m)
- Population2,908
- Jan 34° 19°
- Feb 42° 21°
- Mar 52° 26°
- Apr 61° 32°
- May 71° 40°
- Jun 77° 46°
- Jul 87° 51°
- Aug 87° 50°
- Sep 78° 42°
- Oct 62° 33°
- Nov 44° 26°
- Dec 34° 20°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Leavenworth in September?
The normal high is 78°F and the normal low 42°F, for a daily mean of 59.8°F. September is 8.8°F cooler than August and 12.2°F warmer than October. September is the 4th warmest month of the year in Leavenworth and the 10th wettest. Across the month the normal high falls 11°F, from 83°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 58°F and 62°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 19%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 83°F | 46°F | 11% | 5% |
| September 8 | 81°F | 44°F | 12% | 5% |
| September 15 | 78°F | 42°F | 14% | 7% |
| September 22 | 76°F | 40°F | 16% | 8% |
| September 30 | 72°F | 37°F | 19% | 10% |
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 | 83°F | 46°F | 11% | 5% | 13 h 30 min |
| September 2 | 82°F | 46°F | 11% | 5% | 13 h 20 min |
| September 3 | 82°F | 46°F | 11% | 5% | 13 h 20 min |
| September 4 | 82°F | 45°F | 12% | 5% | 13 h 20 min |
| September 5 | 82°F | 45°F | 12% | 5% | 13 h 10 min |
| September 6 | 81°F | 45°F | 12% | 5% | 13 h 10 min |
| September 7 | 81°F | 44°F | 12% | 5% | 13 h 10 min |
| September 8 | 81°F | 44°F | 12% | 5% | 13 h |
| September 9 | 80°F | 44°F | 13% | 6% | 13 h |
| September 10 | 80°F | 43°F | 13% | 6% | 13 h |
| September 11 | 80°F | 43°F | 13% | 6% | 12 h 50 min |
| September 12 | 79°F | 43°F | 13% | 6% | 12 h 50 min |
| September 13 | 79°F | 42°F | 13% | 6% | 12 h 50 min |
| September 14 | 79°F | 42°F | 14% | 6% | 12 h 40 min |
| September 15 | 78°F | 42°F | 14% | 7% | 12 h 40 min |
| September 16 | 78°F | 42°F | 14% | 7% | 12 h 40 min |
| September 17 | 78°F | 41°F | 14% | 7% | 12 h 30 min |
| September 18 | 77°F | 41°F | 15% | 7% | 12 h 30 min |
| September 19 | 77°F | 41°F | 15% | 7% | 12 h 30 min |
| September 20 | 77°F | 40°F | 15% | 7% | 12 h 20 min |
| September 21 | 76°F | 40°F | 15% | 8% | 12 h 20 min |
| September 22 | 76°F | 40°F | 16% | 8% | 12 h 20 min |
| September 23 | 75°F | 39°F | 16% | 8% | 12 h 10 min |
| September 24 | 75°F | 39°F | 16% | 8% | 12 h 10 min |
| September 25 | 74°F | 39°F | 17% | 9% | 12 h 10 min |
| September 26 | 74°F | 39°F | 17% | 9% | 12 h |
| September 27 | 74°F | 38°F | 18% | 9% | 12 h |
| September 28 | 73°F | 38°F | 18% | 10% | 12 h |
| September 29 | 73°F | 38°F | 19% | 10% | 11 h 50 min |
| September 30 | 72°F | 37°F | 19% | 10% | 11 h 50 min |
- Normal high
- 78°FSeptember average
- Normal low
- 42°FSeptember average
- Precipitation
- 0.76 inmonth total
- Days with precipitation
- 40.01 inch or more
- Days at 90°F or more
- 5
- Nights at 32°F or colder
- 1
- Daylight
- 13 h 30 min to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 25
- Days at 80°F or more
- 14
- Sunshine
- 79%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00454572; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Leavenworth in September?
On a given September day the chance of 0.01 inch or more is 14% on average, highest around September 30 (19%). In all, 0.76 in falls on 4 days of a normal September.
In a normal September in Leavenworth, 5 days reach 90°F and 1 nights fall to freezing.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00454572.
What are the records for September in Leavenworth?
The warmest September temperature on this station's record (since 1914) is 104°F, on September 11, 1944; the coldest is 19°F, on September 24, 1926. The wettest September brought 3.76 in (2013).
The September mean against the 1991-2020 normal of 59.8°F: 2021 59.4°F (−0.4), 2025 66.0°F (+6.2), 2026 58.6°F (−1.2). 1 of 3 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 59.4°F | −0.4°F | 0.17 in |
| 2025 | 66.0°F | +6.2°F | 0.47 in |
| 2026 | 58.6°F | −1.2°F | 1.88 in |
Source: records: ACIS, station USC00454572; recent months: ACIS, station USC00454572. Records and recent months use complete months only.
How does September in Leavenworth compare across Washington?
Across the 96 places PlainClimate covers in Washington, September normal highs run from 66°F in Coupeville to 81°F in Pasco; Leavenworth's is 78°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- Leavenworth in August87°F by day, 50°F at night
- Leavenworth in October62°F by day, 33°F at night
- Leavenworth through the yearEvery month, frost dates, records and recent years
- Washington in SeptemberThe statewide normal and the warmest and coolest places
- Pasco: Washington's warmest Septembernormal high 81°F