Spokane, WA weather in September
Spokane is mild and mostly dry in September: highs average 74°F and nights drop to about 49°F. There are about 5 days with rain. A great month for outdoor plans.
- Normal high
- 74°F
- Normal low
- 49°F
- Wet days
- 5
- 0.6 in total
- Muggy days
- 0
- dew point 65°F+
How September changes from start to finish
| September 1 | September 30 | |
|---|---|---|
| Normal high | 79°F | 67°F |
| Normal low | 53°F | 44°F |
| Chance of a wet day | 14% | 20% |
| Sunrise / sunset | 6:08 am / 7:31 pm | 6:47 am / 6:31 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 am49°Fdew point 43°F
- 9 am61°Fdew point 44°F
- Noon70°Fdew point 43°F
- 3 pm74°Fdew point 40°F
- 6 pm67°Fdew point 41°F
- 9 pm58°Fdew point 42°F
NOAA hourly normals (local standard time) from Spokane Felts Fld (5 mi away); average wind 5 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 more1 of 30
- Muggy daysdaily mean dew point 65°F or more0 of 30
- Wet daysat least 0.01 in of rain or melted snow5 of 30
- Notable rainat least 0.10 in2 of 30
- Freezing nightslow 32°F or below0 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 and snow in September
Normal precipitation is 0.6 in; a dry September brings about 0.2 in and a wet one about 0.8 in (25th and 75th percentiles). Days with half an inch or more are rare. Normal snowfall is 0.1 in.
How September varies from year to year
- Warmest September, 1991-20201998: average high 80°F
- Coolest September2000: average high 68°F
- Wettest September2019: 2.0 in
- Driest September1999: no measurable precipitation
- Highest reading96°F (September 3, 1998)
- Lowest reading22°F (September 23, 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 | 84°F | 74°F | 58°F |
| Normal low | 57°F | 49°F | 38°F |
| Wet days | 3 | 5 | 9 |
| Comfortable days | 10 | 17 | 6 |
| Daylight | 14.2 h | 12.6 h | 10.8 h |
Highs change by -10°F from August and -16°F into October.
How Spokane ranks in September
- Normal high308th warmest of 378 cities; 3rd of 9 in Washington
- Wet days82nd driest of 378
- Comfortable days36th most of 342
What to pack for Spokane in September
- Layers – afternoons near 74°F but nights near 49°F
Heating and cooling
September has 162 heating degree days and 45 cooling degree days (base 65°F), 3% of the year's total heating and cooling demand.
Questions
How hot is Spokane in September?
The normal high is 74°F and the normal low is 49°F. From 1991 to 2020 the hottest September reading was 96°F (most recently on September 3, 1998).
Does it rain a lot in Spokane in September?
About 5 days in September have at least 0.01 in of precipitation, and the normal total is 0.6 in. The wettest September in 1991-2020 was in 2019 (2.0 in); the driest was in 1999, with no measurable precipitation.
Does it snow in Spokane in September?
Yes. Normal snowfall in September is 0.1 in.
Is September a good time to visit Spokane?
September ranks 3rd of 12 months on our comfort score for Spokane (74 out of 100). It has about 17 comfortable days and about 1 day at 90°F or hotter. The best month is June.
Where the numbers come from
- Temperature, rain, snowfall and snow depth: Spokane Intl Airport (USW00024157), 5.4 mi WSW of the city center, 2,353 ft (483 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Frost dates and humidity and wind by hour: Spokane Felts Fld (USW00094176), 5.2 mi ENE of the city center, 1,953 ft (83 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Spokane International Airport (727850-24157), 5.4 mi WSW of the city center, 2,355 ft (485 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).