September is one of the warmer months of the year in Longview, with average highs near 32.5°C and lows around 19.9°C (mean 26.2°C). It is one of the drier months, averaging 78 mm of rainfall and 63% relative humidity across the period.
September is one of the warmer months of the year in Longview. Across 45 years of records, the warmest September in Longview was 2019 — when the month averaged 29.7°C — while the coldest was 2008 at 23.3°C. Typical September days reach 32.5°C with nights near 19.9°C. The long-term trend is warming, about 0.4°C per decade.
September is one of the drier months in Longview, averaging 78 mm of rainfall. The wettest September on record was 1998 with 210 mm, while the driest was 2017 at 6 mm.
Relative humidity in Longview during September averages 63%. The most humid September was 2009 at 80%, and the least humid was 2011 at 43%.
September receives about 5.1 kWh/m²/day of solar energy in Longview. The sunniest September was 2022 at 5.9 kWh/m²/day, and the cloudiest was 2018 at 4.
Average wind speed in Longview during September is 1.7 m/s. The windiest Septembers were 1984 and 1985 at 2.1 m/s, while the calmest was 2025 at 1.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 25.9°C | 25.8°C | 25.5°C | 27.3°C | 26.6°C | +0.7°C |
| Avg High | 32.5°C | 32.0°C | 31.5°C | 33.7°C | 33.1°C | +0.6°C |
| Avg Low | 19.3°C | 19.5°C | 19.4°C | 21.0°C | 20.2°C | +0.9°C |
| Avg Rain | 58 mm | 95 mm | 88 mm | 70 mm | 75 mm | +16 mm |
September temperatures in Longview have risen by about 1.3°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 7°C (1984) to a record high of 44.4°C (2000).
Rainfall in September is one of the drier months, averaging 78 mm, with a wettest year of 210 mm.
One of the best times to visit Longview
September is one of the best times to visit Longview. Expect days averaging 32.5°C and nights around 19.9°C (mean 26.2°C) — warmer than Longview's yearly average — with moderate rainfall (78 mm), so conditions are generally comfortable for sightseeing and outdoor plans.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 33.9°C | 27.1°C | 20.3°C | 37.3°C | 14.0°C | 40 mm | 61% | 1.2 m/s | 5.4 |
| 2024 | 32.5°C | 26.2°C | 19.9°C | 37.4°C | 12.5°C | 140 mm | 65% | 1.7 m/s | 5 |
| 2023 | 35.9°C | 29.0°C | 22.1°C | 43.6°C | 18.5°C | 61 mm | 56% | 1.4 m/s | 5.2 |
| 2022 | 32.8°C | 26.2°C | 19.6°C | 37.9°C | 11.0°C | 23 mm | 64% | 1.3 m/s | 5.9 |
| 2021 | 34.1°C | 27.1°C | 20.2°C | 38.5°C | 12.3°C | 20 mm | 61% | 1.7 m/s | 5.2 |
| 2020 | 29.3°C | 24.2°C | 19.1°C | 33.9°C | 9.7°C | 163 mm | 79% | 1.9 m/s | 4.3 |
| 2019 🔥 | 36.3°C | 29.7°C | 23.1°C | 40.0°C | 21.6°C | 39 mm | 60% | 1.9 m/s | 5.5 |
| 2018 | 31.7°C | 26.8°C | 22.0°C | 37.0°C | 14.9°C | 160 mm | 76% | 1.4 m/s | 4 |
| 2017 | 32.3°C | 25.8°C | 19.3°C | 35.9°C | 12.9°C | 6 mm | 64% | 1.6 m/s | 5.7 |
| 2016 | 33.1°C | 27.1°C | 21.0°C | 36.1°C | 12.3°C | 26 mm | 69% | 1.4 m/s | 5.6 |
| 2015 | 34.7°C | 28.1°C | 21.5°C | 37.7°C | 15.3°C | 15 mm | 56% | 1.6 m/s | 5.4 |
| 2014 | 33.6°C | 27.2°C | 20.8°C | 38.0°C | 12.7°C | 48 mm | 65% | 1.6 m/s | 5 |
| 2013 | 33.6°C | 27.7°C | 21.8°C | 39.3°C | 12.5°C | 172 mm | 59% | 1.4 m/s | 5.2 |
| 2012 | 33.3°C | 26.5°C | 19.7°C | 40.6°C | 12.5°C | 152 mm | 61% | 1.7 m/s | 5.1 |
| 2011 | 34.5°C | 27.1°C | 19.6°C | 42.3°C | 13.0°C | 34 mm | 43% | 2 m/s | 5.7 |
| 2010 | 33.8°C | 27.4°C | 20.9°C | 37.8°C | 11.9°C | 52 mm | 62% | 1.8 m/s | 5.3 |
| 2009 | 28.3°C | 23.7°C | 19.1°C | 35.2°C | 11.9°C | 188 mm | 80% | 1.6 m/s | 4.3 |
| 2008 ❄️ | 28.7°C | 23.3°C | 17.9°C | 33.0°C | 11.6°C | 113 mm | 77% | 1.9 m/s | 4.8 |
| 2007 | 30.6°C | 25.4°C | 20.3°C | 32.7°C | 15.0°C | 73 mm | 77% | 1.3 m/s | 5 |
| 2006 | 32.0°C | 25.2°C | 18.3°C | 37.5°C | 11.3°C | 46 mm | 58% | 1.9 m/s | 5.3 |
| 2005 | 35.1°C | 28.6°C | 22.0°C | 39.6°C | 14.3°C | 95 mm | 58% | 1.8 m/s | 5.4 |
| 2004 | 33.2°C | 26.4°C | 19.5°C | 37.3°C | 14.5°C | 40 mm | 60% | 1.6 m/s | 5.5 |
| 2003 | 31.0°C | 24.8°C | 18.5°C | 35.4°C | 12.0°C | 70 mm | 65% | 1.6 m/s | 5.2 |
| 2002 | 33.0°C | 26.7°C | 20.3°C | 37.5°C | 12.5°C | 72 mm | 62% | 1.8 m/s | 4.9 |
| 2001 | 28.5°C | 23.4°C | 18.2°C | 33.0°C | 8.8°C | 142 mm | 77% | 1.5 m/s | 4.8 |
| 2000 | 34.2°C | 27.1°C | 19.9°C | 44.4°C | 8.2°C | 43 mm | 49% | 1.9 m/s | 5.2 |
| 1999 | 32.7°C | 25.7°C | 18.7°C | 38.1°C | 9.9°C | 51 mm | 53% | 1.7 m/s | 5.3 |
| 1998 🌧️ | 33.0°C | 27.7°C | 22.4°C | 41.5°C | 19.5°C | 210 mm | 70% | 1.8 m/s | 4.9 |
| 1997 | 34.4°C | 27.4°C | 20.4°C | 38.0°C | 14.2°C | 54 mm | 58% | 1.6 m/s | 5.4 |
| 1996 | 29.5°C | 23.7°C | 18.0°C | 33.5°C | 7.8°C | 125 mm | 72% | 1.4 m/s | 5 |
| 1995 | 32.6°C | 26.1°C | 19.7°C | 41.5°C | 8.1°C | 90 mm | 61% | 1.7 m/s | 4.8 |
| 1994 | 32.0°C | 25.2°C | 18.4°C | 36.5°C | 8.1°C | 39 mm | 62% | 1.6 m/s | 5.3 |
| 1993 | 33.4°C | 26.2°C | 19.0°C | 39.4°C | 11.1°C | 83 mm | 56% | 1.8 m/s | 5.1 |
| 1992 | 31.6°C | 25.4°C | 19.2°C | 35.7°C | 8.2°C | 103 mm | 68% | 1.8 m/s | 5.1 |
| 1991 | 29.2°C | 23.7°C | 18.2°C | 33.1°C | 9.3°C | 69 mm | 75% | 1.5 m/s | 5 |
| 1990 | 32.0°C | 26.6°C | 21.3°C | 40.1°C | 9.4°C | 121 mm | 67% | 1.4 m/s | 4.9 |
| 1989 | 31.4°C | 24.5°C | 17.6°C | 39.8°C | 7.9°C | 41 mm | 62% | 1.7 m/s | 4.8 |
| 1988 | 33.8°C | 27.0°C | 20.2°C | 38.0°C | 14.3°C | 52 mm | 59% | 1.8 m/s | 4.8 |
| 1987 | 32.2°C | 25.6°C | 19.0°C | 36.7°C | 12.8°C | 82 mm | 62% | 1.5 m/s | 5 |
| 1986 | 32.6°C | 27.1°C | 21.5°C | 34.9°C | 17.3°C | 98 mm | 71% | 1.9 m/s | 4.6 |
| 1985 | 32.6°C | 26.1°C | 19.6°C | 42.5°C | 7.7°C | 67 mm | 58% | 2.1 m/s | 4.9 |
| 1984 | 31.7°C | 25.2°C | 18.7°C | 37.9°C | 7.0°C | 66 mm | 60% | 2.1 m/s | 4.7 |
| 1983 | 33.1°C | 26.1°C | 19.1°C | 36.9°C | 7.1°C | 33 mm | 60% | 1.8 m/s | — |
| 1982 | 33.1°C | 26.1°C | 19.0°C | 38.3°C | 9.3°C | 31 mm | 55% | 1.8 m/s | — |
| 1981 | 31.8°C | 25.3°C | 18.8°C | 35.3°C | 9.0°C | 55 mm | 64% | 1.5 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 32.5°C with lows near 19.9°C (mean 26.2°C), based on 45 years of NASA POWER data.
September averages 78 mm of rainfall in Longview, one of the drier months. The wettest on record was 210 mm in 1998.
The hottest September reached 44.4°C in 2000. The coldest dipped to 7°C in 1984.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 1.3°C. Daytime highs moved from 32.5°C to 33.8°C and overnight lows from 19°C to 20.4°C over the same span.
September is one of the warmer months of the year in Longview and one of the drier months, so plan for around 32.5°C daytime highs and 19.9°C at night.
Not quite — September is the 9th coolest month in Longview, averaging 26.2°C.
For September in Longview, pack light, breathable clothing and sun protection, with typical highs of 32.5°C and lows of 19.9°C. Bring an umbrella or light rain jacket too.
Relative humidity in September averages 63% — moderately humid.
Average wind speed in September is 1.7 m/s. The windiest September on record averaged 2.1 m/s (1984).
The wettest September on record was 1998 with 210 mm. On average, September sees 78 mm.
All figures are derived from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite reanalysis, covering 1981–2025.
Explore how the weather in Longview behaves each September, based on 45 years of NASA POWER climate data from 1981 to 2025. This page breaks down average temperatures, rainfall, humidity, wind and solar radiation for September specifically, along with year-by-year records and how the month has changed over the decades.
