Yakima weather in September: Yakima, Washington: normal highs, lows, rain and records for September
Yakima in September has a normal high of 79°F and a normal low of 45°F, a daily mean of 62°F, falling from 84°F on the 1st to 73°F by the 30th. Measurable precipitation falls on 3 days in a normal September, 0.23 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 26°C and low of 7°C, 6 mm of precipitation in September.
- NOAA stationYakima Airport
- Station IDUSW00024243
- Location46.57°N 120.54°W
- Elevation1,064 ft (324 m)
- From the center2 miles
- Population97,390
- Jan 40° 24°
- Feb 47° 26°
- Mar 57° 30°
- Apr 65° 35°
- May 74° 44°
- Jun 81° 50°
- Jul 90° 55°
- Aug 89° 53°
- Sep 79° 45°
- Oct 64° 35°
- Nov 49° 27°
- Dec 38° 23°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Yakima in September?
The normal high is 79°F and the normal low 45°F, for a daily mean of 62.2°F. September is 8.7°F cooler than August and 12.4°F warmer than October. September is the 4th warmest month of the year in Yakima and the 10th wettest. Across the month the normal high falls 11°F, from 84°F on September 1 to 73°F on September 30. From one year to the next September's mean temperature typically moves about 2.0°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 60°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 13%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 84°F | 49°F | 8% | 3% |
| September 8 | 82°F | 47°F | 9% | 3% |
| September 15 | 80°F | 45°F | 10% | 3% |
| September 22 | 77°F | 43°F | 11% | 3% |
| September 30 | 73°F | 41°F | 13% | 4% |
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 | 84°F | 49°F | 8% | 3% | 13 h 20 min |
| September 2 | 84°F | 49°F | 9% | 3% | 13 h 20 min |
| September 3 | 84°F | 49°F | 9% | 3% | 13 h 20 min |
| September 4 | 84°F | 48°F | 9% | 3% | 13 h 10 min |
| September 5 | 83°F | 48°F | 9% | 3% | 13 h 10 min |
| September 6 | 83°F | 48°F | 9% | 3% | 13 h 10 min |
| September 7 | 83°F | 47°F | 9% | 3% | 13 h |
| September 8 | 82°F | 47°F | 9% | 3% | 13 h |
| September 9 | 82°F | 47°F | 9% | 3% | 13 h |
| September 10 | 82°F | 47°F | 10% | 3% | 12 h 50 min |
| September 11 | 81°F | 46°F | 10% | 3% | 12 h 50 min |
| September 12 | 81°F | 46°F | 10% | 3% | 12 h 50 min |
| September 13 | 81°F | 46°F | 10% | 3% | 12 h 40 min |
| September 14 | 80°F | 45°F | 10% | 3% | 12 h 40 min |
| September 15 | 80°F | 45°F | 10% | 3% | 12 h 40 min |
| September 16 | 80°F | 45°F | 10% | 3% | 12 h 30 min |
| September 17 | 79°F | 45°F | 11% | 3% | 12 h 30 min |
| September 18 | 79°F | 44°F | 11% | 3% | 12 h 30 min |
| September 19 | 78°F | 44°F | 11% | 3% | 12 h 20 min |
| September 20 | 78°F | 44°F | 11% | 3% | 12 h 20 min |
| September 21 | 78°F | 43°F | 11% | 3% | 12 h 20 min |
| September 22 | 77°F | 43°F | 11% | 3% | 12 h 20 min |
| September 23 | 77°F | 43°F | 11% | 3% | 12 h 10 min |
| September 24 | 76°F | 43°F | 12% | 3% | 12 h 10 min |
| September 25 | 76°F | 42°F | 12% | 3% | 12 h 10 min |
| September 26 | 75°F | 42°F | 12% | 3% | 12 h |
| September 27 | 75°F | 42°F | 12% | 3% | 12 h |
| September 28 | 74°F | 41°F | 13% | 3% | 12 h |
| September 29 | 74°F | 41°F | 13% | 4% | 11 h 50 min |
| September 30 | 73°F | 41°F | 13% | 4% | 11 h 50 min |
- Normal high
- 79°FSeptember average
- Normal low
- 45°FSeptember average
- Precipitation
- 0.23 inmonth total
- Days with precipitation
- 30.01 inch or more
- Days at 90°F or more
- 3
- Nights at 32°F or colder
- 1
- Daylight
- 13 h 20 min to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 27
- Days at 80°F or more
- 15
- Sunshine
- 84%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00024243; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Yakima in September?
On a given September day the chance of 0.01 inch or more is 10% on average, highest around September 30 (13%). In all, 0.23 in falls on 3 days of a normal September.
In a normal September in Yakima, 3 days reach 90°F and 1 nights fall to freezing.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00024243.
How humid and windy is Yakima in September?
At 3 p.m. the normal temperature is 72°F with 31% relative humidity and a dew point of 40°F; at 6 a.m. it is 43°F with 80% humidity. The wind averages 5.9 mph, most often from the south-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. | 43°F | 38°F | 80% | 6.3 mph | 82% |
| 9 a.m. | 59°F | 41°F | 52% | 4.4 mph | 79% |
| noon | 69°F | 40°F | 34% | 5.5 mph | 77% |
| 3 p.m. | 72°F | 40°F | 31% | 6.9 mph | 71% |
| 6 p.m. | 63°F | 43°F | 48% | 5.2 mph | 74% |
| 9 p.m. | 53°F | 42°F | 65% | 6.2 mph | 85% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00024243. 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 Yakima?
The warmest September temperature on Yakima's official record (since 1946) is 100°F, on September 1, 1949; the coldest is 24°F, on September 29, 1985. The wettest September brought 2.07 in (1986).
The September mean against the 1991-2020 normal of 62.2°F: 2021 61.7°F (−0.5), 2022 65.3°F (+3.1), 2023 62.5°F (+0.3), 2024 66.7°F (+4.5), 2025 67.5°F (+5.3), 2026 59.8°F (−2.4). 4 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 61.7°F | −0.5°F | 0.43 in |
| 2022 | 65.3°F | +3.1°F | 0.13 in |
| 2023 | 62.5°F | +0.3°F | 0.39 in |
| 2024 | 66.7°F | +4.5°F | 0.06 in |
| 2025 | 67.5°F | +5.3°F | 0.14 in |
| 2026 | 59.8°F | −2.4°F | 1.83 in |
Source: records: ACIS, NWS threaded record YKMthr; recent months: ACIS, station USW00024243. Records and recent months use complete months only.
How does September in Yakima 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; Yakima's is 79°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.