September is one of the warmer months of the year in Visalia, with average highs near 34.1°C and lows around 18.7°C (mean 26.4°C). It is one of the drier months, averaging 8 mm of rainfall and 29% relative humidity across the period.
September is one of the warmer months of the year in Visalia. Across 45 years of records, the warmest September in Visalia was 2022 — when the month averaged 29.7°C — while the coldest was 1986 at 21.4°C. Typical September days reach 34.1°C with nights near 18.7°C. The long-term trend is warming, about 0.6°C per decade.
September is one of the drier months in Visalia, averaging 8 mm of rainfall. The wettest September on record was 1982 with 66 mm, while the driest was 2012 at 0 mm.
Relative humidity in Visalia during September averages 29%. The most humid September was 2025 at 42%, and the least humid was 2012 at 22%.
September receives about 6.1 kWh/m²/day of solar energy in Visalia. The sunniest Septembers were 2003, 2004 and 2010 at 6.4 kWh/m²/day, and the cloudiest was 2020 at 5.1.
Average wind speed in Visalia during September is 1.5 m/s. The windiest Septembers were 1987 and 2017 at 1.7 m/s, while the calmest were 2020, 2021 and 2023, among others at 1.4 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 25.1°C | 26.2°C | 26.4°C | 27.0°C | 27.7°C | +2.6°C |
| Avg High | 32.7°C | 34.1°C | 34.3°C | 34.7°C | 34.9°C | +2.2°C |
| Avg Low | 17.5°C | 18.4°C | 18.5°C | 19.3°C | 20.5°C | +3°C |
| Avg Rain | 20 mm | 7 mm | 5 mm | 3 mm | 6 mm | -14 mm |
September temperatures in Visalia have risen by about 2.1°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 8°C (1982) to a record high of 47.1°C (2022).
Rainfall in September is one of the drier months, averaging 8 mm, with a wettest year of 66 mm.
One of the best times to visit Visalia
September is one of the best times to visit Visalia. Expect days averaging 34.1°C and nights around 18.7°C (mean 26.4°C) — warmer than Visalia's yearly average — with low rainfall (8 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 | 34.1°C | 27.5°C | 20.9°C | 42.1°C | 17.9°C | 22 mm | 42% | 1.5 m/s | 5.7 |
| 2024 | 35.8°C | 28.1°C | 20.4°C | 42.8°C | 13.6°C | 0 mm | 28% | 1.5 m/s | 6.1 |
| 2023 | 32.6°C | 25.6°C | 18.5°C | 38.6°C | 14.9°C | 5 mm | 41% | 1.4 m/s | 5.8 |
| 2022 🔥 | 36.7°C | 29.7°C | 22.6°C | 47.1°C | 15.1°C | 8 mm | 31% | 1.6 m/s | 5.8 |
| 2021 | 35.1°C | 27.3°C | 19.5°C | 43.1°C | 14.5°C | 1 mm | 26% | 1.4 m/s | 6 |
| 2020 | 35.0°C | 27.9°C | 20.8°C | 44.2°C | 16.8°C | 0 mm | 26% | 1.4 m/s | 5.1 |
| 2019 | 33.6°C | 26.4°C | 19.2°C | 40.8°C | 10.8°C | 1 mm | 30% | 1.6 m/s | 6.2 |
| 2018 | 35.2°C | 27.0°C | 18.9°C | 40.1°C | 14.5°C | 1 mm | 23% | 1.4 m/s | 6.3 |
| 2017 | 33.5°C | 26.7°C | 19.9°C | 45.4°C | 10.9°C | 10 mm | 35% | 1.7 m/s | 5.9 |
| 2016 | 33.9°C | 26.0°C | 18.1°C | 40.9°C | 12.5°C | 1 mm | 27% | 1.6 m/s | 6.3 |
| 2015 | 35.1°C | 27.8°C | 20.4°C | 41.3°C | 14.8°C | 4 mm | 26% | 1.5 m/s | 5.8 |
| 2014 | 35.2°C | 27.6°C | 19.9°C | 40.7°C | 13.6°C | 7 mm | 31% | 1.5 m/s | 6.1 |
| 2013 | 33.2°C | 25.7°C | 18.1°C | 40.3°C | 9.9°C | 2 mm | 32% | 1.6 m/s | 6.2 |
| 2012 | 36.4°C | 28.2°C | 20.0°C | 39.3°C | 16.0°C | 0 mm | 22% | 1.5 m/s | 6.2 |
| 2011 | 36.0°C | 28.1°C | 20.2°C | 41.2°C | 15.2°C | 3 mm | 28% | 1.6 m/s | 6.1 |
| 2010 | 34.7°C | 26.5°C | 18.2°C | 42.0°C | 12.8°C | 0 mm | 26% | 1.5 m/s | 6.4 |
| 2009 | 36.0°C | 28.2°C | 20.4°C | 41.7°C | 11.2°C | 1 mm | 26% | 1.6 m/s | 6.1 |
| 2008 | 35.6°C | 27.4°C | 19.1°C | 41.6°C | 14.2°C | 1 mm | 24% | 1.5 m/s | 6.3 |
| 2007 | 31.4°C | 24.4°C | 17.3°C | 41.8°C | 11.9°C | 16 mm | 36% | 1.5 m/s | 6.2 |
| 2006 | 34.4°C | 26.3°C | 18.1°C | 40.7°C | 11.9°C | 3 mm | 25% | 1.6 m/s | 6.3 |
| 2005 | 32.0°C | 24.2°C | 16.5°C | 37.9°C | 12.4°C | 10 mm | 31% | 1.5 m/s | 6.3 |
| 2004 | 33.7°C | 25.8°C | 18.0°C | 41.7°C | 11.1°C | 5 mm | 25% | 1.6 m/s | 6.4 |
| 2003 | 36.4°C | 28.3°C | 20.2°C | 42.9°C | 16.8°C | 5 mm | 26% | 1.5 m/s | 6.4 |
| 2002 | 34.8°C | 26.8°C | 18.8°C | 41.8°C | 13.0°C | 2 mm | 26% | 1.6 m/s | 6 |
| 2001 | 34.7°C | 26.5°C | 18.3°C | 42.0°C | 15.4°C | 6 mm | 30% | 1.5 m/s | 6.3 |
| 2000 | 33.6°C | 25.7°C | 17.9°C | 40.7°C | 13.1°C | 4 mm | 30% | 1.6 m/s | 6.1 |
| 1999 | 35.1°C | 27.0°C | 19.0°C | 38.3°C | 13.6°C | 7 mm | 28% | 1.6 m/s | 6.3 |
| 1998 | 32.3°C | 25.3°C | 18.3°C | 43.5°C | 12.4°C | 17 mm | 40% | 1.6 m/s | 6.1 |
| 1997 | 34.6°C | 27.1°C | 19.6°C | 39.1°C | 15.0°C | 6 mm | 30% | 1.5 m/s | 5.9 |
| 1996 | 33.2°C | 25.2°C | 17.2°C | 40.3°C | 13.2°C | 0 mm | 26% | 1.6 m/s | 6.3 |
| 1995 | 34.7°C | 26.6°C | 18.6°C | 39.0°C | 13.6°C | 1 mm | 26% | 1.5 m/s | 6.3 |
| 1994 | 33.6°C | 25.8°C | 17.9°C | 39.2°C | 12.1°C | 24 mm | 30% | 1.5 m/s | 5.6 |
| 1993 | 34.2°C | 26.1°C | 18.0°C | 39.7°C | 11.6°C | 0 mm | 25% | 1.6 m/s | 6.3 |
| 1992 | 34.2°C | 26.3°C | 18.4°C | 38.9°C | 14.2°C | 1 mm | 25% | 1.5 m/s | 6.1 |
| 1991 | 35.3°C | 27.3°C | 19.4°C | 40.1°C | 12.7°C | 4 mm | 28% | 1.6 m/s | 6.2 |
| 1990 | 33.4°C | 25.5°C | 17.6°C | 38.5°C | 14.7°C | 9 mm | 30% | 1.5 m/s | 6.1 |
| 1989 | 31.9°C | 24.2°C | 16.4°C | 37.8°C | 11.0°C | 31 mm | 35% | 1.5 m/s | 5.9 |
| 1988 | 34.6°C | 26.6°C | 18.6°C | 43.7°C | 11.6°C | 5 mm | 24% | 1.6 m/s | 6 |
| 1987 | 34.4°C | 26.2°C | 17.9°C | 41.3°C | 13.0°C | 1 mm | 25% | 1.7 m/s | 6 |
| 1986 ❄️ | 28.5°C | 21.4°C | 14.3°C | 38.0°C | 9.1°C | 21 mm | 35% | 1.5 m/s | 6 |
| 1985 | 29.2°C | 22.2°C | 15.2°C | 35.8°C | 11.3°C | 20 mm | 39% | 1.4 m/s | 5.7 |
| 1984 | 35.9°C | 28.3°C | 20.7°C | 41.0°C | 13.4°C | 4 mm | 25% | 1.6 m/s | 5.8 |
| 1983 | 34.5°C | 26.9°C | 19.3°C | 40.8°C | 13.7°C | 31 mm | 31% | 1.6 m/s | — |
| 1982 🌧️ | 31.1°C | 23.9°C | 16.6°C | 39.7°C | 8.0°C | 66 mm | 36% | 1.5 m/s | — |
| 1981 | 34.4°C | 26.3°C | 18.1°C | 38.0°C | 12.4°C | 2 mm | 26% | 1.5 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 34.1°C with lows near 18.7°C (mean 26.4°C), based on 45 years of NASA POWER data.
September averages 8 mm of rainfall in Visalia, one of the drier months. The wettest on record was 66 mm in 1982.
The hottest September reached 47.1°C in 2022. The coldest dipped to 8°C in 1982.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 2.1°C. Daytime highs moved from 33°C to 34.9°C and overnight lows from 18°C to 20.4°C over the same span.
September is one of the warmer months of the year in Visalia and one of the drier months, so plan for around 34.1°C daytime highs and 18.7°C at night.
Not quite — September is the 10th coolest month in Visalia, averaging 26.4°C.
For September in Visalia, pack light, breathable clothing and sun protection, with typical highs of 34.1°C and lows of 18.7°C.
Relative humidity in September averages 29% — relatively dry.
Average wind speed in September is 1.5 m/s. The windiest September on record averaged 1.7 m/s (1987).
The wettest September on record was 1982 with 66 mm. On average, September sees 8 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 Visalia 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.
