Pasco weather in September: Pasco, Washington: normal highs, lows, rain and records for September
Pasco in September has a normal high of 81°F and a normal low of 48°F, a daily mean of 64°F, falling from 86°F on the 1st to 75°F by the 30th. Measurable precipitation falls on 3 days in a normal September, 0.31 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 27°C and low of 9°C, 8 mm of precipitation in September.
- NOAA stationPasco Tri Cities Airport
- Station IDUSW00024163
- Location46.27°N 119.12°W
- Elevation407 ft (124 m)
- Population81,724
- Jan 41° 28°
- Feb 49° 28°
- Mar 59° 33°
- Apr 67° 38°
- May 77° 46°
- Jun 83° 53°
- Jul 93° 57°
- Aug 91° 56°
- Sep 81° 48°
- Oct 66° 38°
- Nov 50° 32°
- Dec 41° 27°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Pasco in September?
The normal high is 81°F and the normal low 48°F, for a daily mean of 64.2°F. September is 9.0°F cooler than August and 12.1°F warmer than October. September is the 4th warmest month of the year in Pasco and the 10th wettest. Across the month the normal high falls 11°F, from 86°F on September 1 to 75°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 62°F and 66°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 14%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 86°F | 52°F | 9% | 3% |
| September 8 | 84°F | 50°F | 9% | 3% |
| September 15 | 81°F | 48°F | 11% | 3% |
| September 22 | 78°F | 46°F | 12% | 4% |
| September 30 | 75°F | 43°F | 14% | 5% |
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 | 86°F | 52°F | 9% | 3% | 13 h 20 min |
| September 2 | 86°F | 51°F | 9% | 3% | 13 h 20 min |
| September 3 | 86°F | 51°F | 9% | 3% | 13 h 20 min |
| September 4 | 85°F | 51°F | 9% | 3% | 13 h 10 min |
| September 5 | 85°F | 51°F | 9% | 3% | 13 h 10 min |
| September 6 | 85°F | 50°F | 9% | 3% | 13 h 10 min |
| September 7 | 84°F | 50°F | 9% | 3% | 13 h |
| September 8 | 84°F | 50°F | 9% | 3% | 13 h |
| September 9 | 84°F | 49°F | 10% | 3% | 13 h |
| September 10 | 83°F | 49°F | 10% | 3% | 12 h 50 min |
| September 11 | 83°F | 49°F | 10% | 3% | 12 h 50 min |
| September 12 | 83°F | 49°F | 10% | 3% | 12 h 50 min |
| September 13 | 82°F | 48°F | 10% | 3% | 12 h 40 min |
| September 14 | 82°F | 48°F | 10% | 3% | 12 h 40 min |
| September 15 | 81°F | 48°F | 11% | 3% | 12 h 40 min |
| September 16 | 81°F | 48°F | 11% | 3% | 12 h 30 min |
| September 17 | 81°F | 47°F | 11% | 4% | 12 h 30 min |
| September 18 | 80°F | 47°F | 11% | 4% | 12 h 30 min |
| September 19 | 80°F | 47°F | 11% | 4% | 12 h 20 min |
| September 20 | 79°F | 46°F | 12% | 4% | 12 h 20 min |
| September 21 | 79°F | 46°F | 12% | 4% | 12 h 20 min |
| September 22 | 78°F | 46°F | 12% | 4% | 12 h 10 min |
| September 23 | 78°F | 46°F | 12% | 4% | 12 h 10 min |
| September 24 | 78°F | 45°F | 12% | 4% | 12 h 10 min |
| September 25 | 77°F | 45°F | 13% | 4% | 12 h 10 min |
| September 26 | 77°F | 45°F | 13% | 4% | 12 h |
| September 27 | 76°F | 44°F | 13% | 5% | 12 h |
| September 28 | 76°F | 44°F | 13% | 5% | 12 h |
| September 29 | 75°F | 44°F | 14% | 5% | 11 h 50 min |
| September 30 | 75°F | 43°F | 14% | 5% | 11 h 50 min |
- Normal high
- 81°FSeptember average
- Normal low
- 48°FSeptember average
- Precipitation
- 0.31 inmonth total
- Days with precipitation
- 30.01 inch or more
- Days at 90°F or more
- 5
- Daylight
- 13 h 20 min to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 28
- Days at 80°F or more
- 17
- Sunshine
- 87%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00024163; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Pasco in September?
On a given September day the chance of 0.01 inch or more is 11% on average, highest around September 30 (14%). In all, 0.31 in falls on 3 days of a normal September.
In a normal September in Pasco, 5 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00024163.
What are the records for September in Pasco?
The warmest September temperature on this station's record (since 1945) is 102°F, on September 1, 2022; the coldest is 26°F, on September 24, 2000. The wettest September brought 1.07 in (2010).
The September mean against the 1991-2020 normal of 64.2°F: 2021 65.8°F (+1.6), 2022 67.9°F (+3.7), 2023 65.8°F (+1.6), 2024 68.5°F (+4.3), 2025 69.2°F (+5.0), 2026 63.2°F (−1.0). 5 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 65.8°F | +1.6°F | 0.41 in |
| 2022 | 67.9°F | +3.7°F | 0.12 in |
| 2023 | 65.8°F | +1.6°F | 0.20 in |
| 2024 | 68.5°F | +4.3°F | 0.11 in |
| 2025 | 69.2°F | +5.0°F | 0.20 in |
| 2026 | 63.2°F | −1.0°F | 0.33 in |
Source: records: ACIS, station USW00024163; recent months: ACIS, station USW00024163. Records and recent months use complete months only.
How does September in Pasco 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; Pasco's is 81°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.