Longview weather in September: Longview, Washington: normal highs, lows, rain and records for September
Longview in September has a normal high of 76°F and a normal low of 50°F, a daily mean of 63°F, falling from 79°F on the 1st to 71°F by the 30th. Measurable precipitation falls on 9 days in a normal September, 2.29 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 24°C and low of 10°C, 58 mm of precipitation in September.
- NOAA stationLongview
- Station IDUSC00454769
- Location46.15°N 122.92°W
- Elevation12 ft (4 m)
- Population38,294
- Jan 48° 35°
- Feb 52° 35°
- Mar 57° 38°
- Apr 62° 40°
- May 69° 45°
- Jun 73° 50°
- Jul 79° 53°
- Aug 80° 53°
- Sep 76° 50°
- Oct 64° 44°
- Nov 53° 39°
- Dec 47° 35°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Longview in September?
The normal high is 76°F and the normal low 50°F, for a daily mean of 62.6°F. September is 4.3°F cooler than August and 8.6°F warmer than October. September is the 3rd warmest month of the year in Longview and the 9th wettest. Across the month the normal high falls 8°F, from 79°F on September 1 to 71°F on September 30. From one year to the next September's mean temperature typically moves about 1.8°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 61°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 40%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 79°F | 52°F | 23% | 12% |
| September 8 | 78°F | 51°F | 26% | 14% |
| September 15 | 76°F | 50°F | 30% | 16% |
| September 22 | 74°F | 49°F | 34% | 19% |
| September 30 | 71°F | 47°F | 40% | 22% |
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 | 52°F | 23% | 12% | 13 h 20 min |
| September 2 | 79°F | 51°F | 23% | 12% | 13 h 20 min |
| September 3 | 79°F | 51°F | 24% | 13% | 13 h 20 min |
| September 4 | 78°F | 51°F | 24% | 13% | 13 h 10 min |
| September 5 | 78°F | 51°F | 25% | 13% | 13 h 10 min |
| September 6 | 78°F | 51°F | 25% | 13% | 13 h 10 min |
| September 7 | 78°F | 51°F | 25% | 14% | 13 h |
| September 8 | 78°F | 51°F | 26% | 14% | 13 h |
| September 9 | 78°F | 51°F | 26% | 14% | 13 h |
| September 10 | 77°F | 50°F | 27% | 15% | 12 h 50 min |
| September 11 | 77°F | 50°F | 27% | 15% | 12 h 50 min |
| September 12 | 77°F | 50°F | 28% | 15% | 12 h 50 min |
| September 13 | 77°F | 50°F | 29% | 16% | 12 h 40 min |
| September 14 | 77°F | 50°F | 29% | 16% | 12 h 40 min |
| September 15 | 76°F | 50°F | 30% | 16% | 12 h 40 min |
| September 16 | 76°F | 50°F | 30% | 17% | 12 h 30 min |
| September 17 | 76°F | 50°F | 31% | 17% | 12 h 30 min |
| September 18 | 75°F | 49°F | 32% | 18% | 12 h 30 min |
| September 19 | 75°F | 49°F | 32% | 18% | 12 h 20 min |
| September 20 | 75°F | 49°F | 33% | 18% | 12 h 20 min |
| September 21 | 75°F | 49°F | 33% | 19% | 12 h 20 min |
| September 22 | 74°F | 49°F | 34% | 19% | 12 h 10 min |
| September 23 | 74°F | 49°F | 35% | 19% | 12 h 10 min |
| September 24 | 74°F | 48°F | 35% | 20% | 12 h 10 min |
| September 25 | 73°F | 48°F | 36% | 20% | 12 h 10 min |
| September 26 | 73°F | 48°F | 37% | 21% | 12 h |
| September 27 | 72°F | 48°F | 37% | 21% | 12 h |
| September 28 | 72°F | 48°F | 38% | 21% | 12 h |
| September 29 | 72°F | 48°F | 39% | 22% | 11 h 50 min |
| September 30 | 71°F | 47°F | 40% | 22% | 11 h 50 min |
- Normal high
- 76°FSeptember average
- Normal low
- 50°FSeptember average
- Precipitation
- 2.29 inmonth total
- Days with precipitation
- 90.01 inch or more
- Days at 90°F or more
- 1
- Daylight
- 13 h 20 min to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 22
- Days at 80°F or more
- 9
- Sunshine
- 75%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00454769; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Longview in September?
On a given September day the chance of 0.01 inch or more is 30% on average, highest around September 30 (40%). In all, 2.29 in falls on 9 days of a normal September.
In a normal September in Longview, 1 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00454769.
What are the records for September in Longview?
The warmest September temperature on this station's record (since 1925) is 104°F, on September 5, 1944; the coldest is 29°F, on September 26, 1926. The wettest September brought 5.03 in (1927).
The September mean against the 1991-2020 normal of 62.6°F: 2021 63.2°F (+0.6), 2022 65.9°F (+3.3), 2023 62.7°F (+0.1), 2025 66.0°F (+3.4), 2026 62.0°F (−0.6). 4 of 5 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 63.2°F | +0.6°F | 3.02 in |
| 2022 | 65.9°F | +3.3°F | 0.40 in |
| 2023 | 62.7°F | +0.1°F | 1.89 in |
| 2025 | 66.0°F | +3.4°F | 0.95 in |
| 2026 | 62.0°F | −0.6°F | 0.94 in |
Source: records: ACIS, station USC00454769; recent months: ACIS, station USC00454769. Records and recent months use complete months only.
How does September in Longview 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; Longview's is 76°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.