Spokane weather in September: Spokane, Washington: normal highs, lows, rain and records for September
Spokane in September has a normal high of 74°F and a normal low of 49°F, a daily mean of 61°F, falling from 79°F on the 1st to 67°F by the 30th. Measurable precipitation falls on 5 days in a normal September, 0.58 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 23°C and low of 9°C, 15 mm of precipitation and 0 cm of snow in September.
- NOAA stationSpokane International Airport
- Station IDUSW00024157
- Location47.62°N 117.53°W
- Elevation2,353 ft (717 m)
- From the center5 miles
- Population230,609
- Jan 35° 25°
- Feb 40° 26°
- Mar 49° 32°
- Apr 57° 37°
- May 67° 45°
- Jun 74° 51°
- Jul 84° 58°
- Aug 84° 57°
- Sep 74° 49°
- Oct 58° 38°
- Nov 42° 30°
- Dec 34° 24°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Spokane in September?
The normal high is 74°F and the normal low 49°F, for a daily mean of 61.1°F. September is 9.2°F cooler than August and 13.2°F warmer than October. September is the 4th warmest month of the year in Spokane and the 10th wettest. Across the month the normal high falls 12°F, from 79°F on September 1 to 67°F on September 30. From one year to the next September's mean temperature typically moves about 2.5°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 59°F and 64°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 21%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 79°F | 53°F | 13% | 5% |
| September 8 | 77°F | 51°F | 14% | 5% |
| September 15 | 74°F | 49°F | 16% | 6% |
| September 22 | 71°F | 47°F | 18% | 7% |
| September 30 | 67°F | 44°F | 21% | 9% |
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 | 79°F | 53°F | 13% | 5% | 13 h 30 min |
| September 2 | 79°F | 53°F | 13% | 5% | 13 h 20 min |
| September 3 | 78°F | 52°F | 13% | 5% | 13 h 20 min |
| September 4 | 78°F | 52°F | 14% | 5% | 13 h 20 min |
| September 5 | 78°F | 52°F | 14% | 5% | 13 h 10 min |
| September 6 | 77°F | 52°F | 14% | 5% | 13 h 10 min |
| September 7 | 77°F | 51°F | 14% | 5% | 13 h 10 min |
| September 8 | 77°F | 51°F | 14% | 5% | 13 h |
| September 9 | 76°F | 51°F | 15% | 5% | 13 h |
| September 10 | 76°F | 50°F | 15% | 6% | 13 h |
| September 11 | 76°F | 50°F | 15% | 6% | 12 h 50 min |
| September 12 | 75°F | 50°F | 15% | 6% | 12 h 50 min |
| September 13 | 75°F | 50°F | 16% | 6% | 12 h 50 min |
| September 14 | 75°F | 49°F | 16% | 6% | 12 h 40 min |
| September 15 | 74°F | 49°F | 16% | 6% | 12 h 40 min |
| September 16 | 74°F | 49°F | 17% | 6% | 12 h 40 min |
| September 17 | 73°F | 48°F | 17% | 7% | 12 h 30 min |
| September 18 | 73°F | 48°F | 17% | 7% | 12 h 30 min |
| September 19 | 73°F | 48°F | 17% | 7% | 12 h 30 min |
| September 20 | 72°F | 47°F | 18% | 7% | 12 h 20 min |
| September 21 | 72°F | 47°F | 18% | 7% | 12 h 20 min |
| September 22 | 71°F | 47°F | 18% | 7% | 12 h 20 min |
| September 23 | 71°F | 46°F | 18% | 7% | 12 h 10 min |
| September 24 | 70°F | 46°F | 19% | 7% | 12 h 10 min |
| September 25 | 70°F | 46°F | 19% | 8% | 12 h 10 min |
| September 26 | 69°F | 45°F | 19% | 8% | 12 h |
| September 27 | 69°F | 45°F | 20% | 8% | 12 h |
| September 28 | 68°F | 45°F | 20% | 8% | 11 h 50 min |
| September 29 | 68°F | 44°F | 20% | 8% | 11 h 50 min |
| September 30 | 67°F | 44°F | 21% | 9% | 11 h 50 min |
- Normal high
- 74°FSeptember average
- Normal low
- 49°FSeptember average
- Precipitation
- 0.58 inmonth total
- Days with precipitation
- 50.01 inch or more
- Snowfall
- 0.1 inmonth total
- Days at 90°F or more
- 1
- Daylight
- 13 h 30 min to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 20
- Days at 80°F or more
- 9
- Sunshine
- 81%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00024157; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain or snow in Spokane in September?
On a given September day the chance of 0.01 inch or more is 16% on average, highest around September 30 (21%). In all, 0.58 in falls on 5 days of a normal September.
In a normal September in Spokane, 1 days reach 90°F and snowfall averages 0.1 inches.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00024157.
How humid and windy is Spokane in September?
At 3 p.m. the normal temperature is 67°F with 33% relative humidity and a dew point of 37°F; at 6 a.m. it is 46°F with 74% humidity. The wind averages 7.8 mph, most often from the southwest in the afternoon. A dew point under 50°F feels dry.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 46°F | 38°F | 74% | 6.5 mph | 44% |
| 9 a.m. | 54°F | 40°F | 58% | 8.7 mph | 46% |
| noon | 64°F | 39°F | 40% | 9.4 mph | 45% |
| 3 p.m. | 67°F | 37°F | 33% | 9.9 mph | 40% |
| 6 p.m. | 60°F | 37°F | 41% | 6.9 mph | 47% |
| 9 p.m. | 53°F | 37°F | 54% | 6.9 mph | 61% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00024157. 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 Spokane?
The warmest September temperature on Spokane's official record (since 1881) is 99°F, on September 2, 2025; the coldest is 22°F, on September 24, 1926. The wettest September brought 5.58 in (1927); the snowiest, 3.3 inches (2019).
The September mean against the 1991-2020 normal of 61.1°F: 2021 61.8°F (+0.7), 2022 65.5°F (+4.4), 2023 61.9°F (+0.8), 2024 66.7°F (+5.6), 2025 68.8°F (+7.6), 2026 60.0°F (−1.1). 5 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 61.8°F | +0.7°F | 1.35 in |
| 2022 | 65.5°F | +4.4°F | 0.53 in |
| 2023 | 61.9°F | +0.8°F | 0.43 in |
| 2024 | 66.7°F | +5.6°F | 0.04 in |
| 2025 | 68.8°F | +7.6°F | 0.43 in |
| 2026 | 60.0°F | −1.1°F | 1.03 in |
Source: records: ACIS, NWS threaded record GEGthr; recent months: ACIS, station USW00024157. Records and recent months use complete months only.
How does September in Spokane 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; Spokane's is 74°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.