Leavenworth, WA weather in September
Leavenworth is mild and mostly dry in September: highs average 78°F and nights drop to about 42°F. Expect about 4 wet days. A great month for outdoor plans.
- Normal high
- 78°F
- Normal low
- 42°F
- Wet days
- 4
- 0.8 in total
- Muggy days
- 0
- dew point 65°F+
How September changes from start to finish
| September 1 | September 30 | |
|---|---|---|
| Normal high | 83°F | 72°F |
| Normal low | 46°F | 37°F |
| Chance of a wet day | 12% | 18% |
| Sunrise / sunset | 6:21 am / 7:43 pm | 7:00 am / 6:44 pm |
| Daylight | 13.4 h | 11.7 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Pacific Time).
A typical September day
- 6 am55°Fdew point 42°F
- 9 am62°Fdew point 43°F
- Noon71°Fdew point 41°F
- 3 pm76°Fdew point 40°F
- 6 pm70°Fdew point 42°F
- 9 pm64°Fdew point 42°F
NOAA hourly normals (local standard time) from Wenatchee Pangborn Airport (26 mi away); average wind 8 mph.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F17 of 30
- Hot dayshigh 90°F or more5 of 30
- Muggy daysdaily mean dew point 65°F or more0 of 30
- Wet daysat least 0.01 in of rain or melted snow4 of 30
- Notable rainat least 0.10 in2 of 30
- Freezing nightslow 32°F or below1 of 30
- Snow on the groundsnow depth 1 in or more0 of 30
Average days per September, counted from daily records for each year 1991-2020.
Rain in September
Normal precipitation is 0.8 in; a dry September brings about 0.1 in and a wet one about 1.1 in (25th and 75th percentiles). Days with half an inch or more are rare. Snow is very rare.
How September varies from year to year
- Warmest September, 1991-20201998: average high 87°F
- Coolest September2019: average high 72°F
- Wettest September2013: 3.8 in
- Driest September1998: no measurable precipitation
- Highest reading101°F (September 2, 1998)
- Lowest reading29°F (September 24, 2000)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
September compared with August and October
| August | September | October | |
|---|---|---|---|
| Normal high | 87°F | 78°F | 62°F |
| Normal low | 50°F | 42°F | 33°F |
| Wet days | 2 | 4 | 9 |
| Comfortable days | 5 | 17 | 13 |
| Daylight | 14.2 h | 12.6 h | 10.8 h |
Highs change by -9°F from August and -16°F into October.
Nearby alternatives in September
- Cooler: Kent, WA75 mi · high 72°F · 8 wet days
How Leavenworth ranks in September
- Normal high224th warmest of 378 cities; 1st of 9 in Washington
- Wet days76th driest of 378
- Comfortable days34th most of 342
What to pack for Leavenworth in September
- Layers – afternoons near 78°F but nights near 42°F
Frost in September
The first fall frost typically comes around Sep 30; in 1 year in 10 it comes before Sep 18. All frost dates for Leavenworth.
Heating and cooling
September has 183 heating degree days and 27 cooling degree days (base 65°F), 3% of the year's total heating and cooling demand.
Questions
How hot is Leavenworth in September?
The normal high is 78°F and the normal low is 42°F. From 1991 to 2020 the hottest September reading was 101°F (September 2, 1998).
Does it rain a lot in Leavenworth in September?
About 4 days in September have at least 0.01 in of precipitation, and the normal total is 0.8 in. The wettest September in 1991-2020 was in 2013 (3.8 in); the driest was in 1998, with no measurable precipitation.
Is September a good time to visit Leavenworth?
September ranks 3rd of 12 months on our comfort score for Leavenworth (72 out of 100). It has about 17 comfortable days and about 5 days at 90°F or hotter. The best months are May and June.
Where the numbers come from
- Temperature, rain, snowfall and frost dates: Leavenworth 3 S (USC00454572), 2.7 mi SSW of the city center, 1,128 ft . NOAA normals and daily records, 1991-2020.
- Snow depth: Wenatchee (USC00459074), 20 mi SE of the city center, 626 ft (545 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Humidity and wind by hour: Wenatchee Pangborn Airport (USW00094239), 26 mi ESE of the city center, 1,229 ft (58 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Pangborn Memorial Airport (727825-94239), 26 mi ESE of the city center, 1,239 ft (68 ft higher than the city). Hourly observations, 1991-2020.
- Not available for this location: cloud cover (no station close enough or similar enough in elevation).