September is one of the warmer months of the year in Lake Havasu City, with average highs near 36.6°C and lows around 22.3°C (mean 29.5°C). It is about average for rainfall, averaging 17 mm of rainfall and 28% relative humidity across the period.
September is one of the warmer months of the year in Lake Havasu City. Across 45 years of records, the warmest September in Lake Havasu City was 2020 — when the month averaged 31.9°C — while the coldest was 1986 at 25.1°C. Typical September days reach 36.6°C with nights near 22.3°C. The long-term trend is warming, about 0.6°C per decade.
September is about average for rainfall in Lake Havasu City, averaging 17 mm of rainfall. The wettest September on record was 1997 with 63 mm, while the driest was 2020 at 0 mm.
Relative humidity in Lake Havasu City during September averages 28%. The most humid September was 1983 at 42%, and the least humid was 2020 at 16%.
September receives about 6.2 kWh/m²/day of solar energy in Lake Havasu City. The sunniest Septembers were 1993 and 2010 at 6.6 kWh/m²/day, and the cloudiest was 2025 at 5.7.
Average wind speed in Lake Havasu City during September is 2.2 m/s. The windiest September was 2004 at 2.7 m/s, while the calmest was 1990 at 1.9 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 28.0°C | 29.3°C | 29.8°C | 29.8°C | 30.9°C | +2.9°C |
| Avg High | 35.2°C | 36.4°C | 37.3°C | 36.8°C | 37.8°C | +2.6°C |
| Avg Low | 20.7°C | 22.2°C | 22.3°C | 22.9°C | 23.9°C | +3.2°C |
| Avg Rain | 21 mm | 21 mm | 11 mm | 17 mm | 10 mm | -11 mm |
September temperatures in Lake Havasu City have risen by about 2.4°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 9.5°C (1986) to a record high of 46.7°C (2020).
Rainfall in September is about average for rainfall, averaging 17 mm, with a wettest year of 63 mm.
A good time to visit Lake Havasu City
September is a good time to visit Lake Havasu City, with days averaging 36.6°C and nights around 22.3°C (mean 29.5°C, warmer than Lake Havasu City's yearly average) and low rainfall. October and April are marginally more temperate, but September still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 35.8°C | 29.7°C | 23.6°C | 41.2°C | 19.0°C | 29 mm | 36% | 2 m/s | 5.7 |
| 2024 | 39.4°C | 31.8°C | 24.3°C | 45.7°C | 16.1°C | 3 mm | 20% | 2.3 m/s | 6.4 |
| 2023 | 36.3°C | 29.3°C | 22.3°C | 43.3°C | 16.8°C | 16 mm | 30% | 2.3 m/s | 5.9 |
| 2022 | 37.9°C | 31.4°C | 25.0°C | 43.8°C | 18.7°C | 11 mm | 33% | 2.3 m/s | 5.8 |
| 2021 | 37.9°C | 31.2°C | 24.5°C | 43.7°C | 17.5°C | 3 mm | 26% | 2.1 m/s | 6 |
| 2020 🔥 | 39.8°C | 31.9°C | 23.9°C | 46.7°C | 16.5°C | 0 mm | 16% | 2.3 m/s | 6.5 |
| 2019 | 35.9°C | 29.1°C | 22.2°C | 44.2°C | 12.2°C | 20 mm | 30% | 2.3 m/s | 6.3 |
| 2018 | 39.2°C | 31.8°C | 24.5°C | 43.6°C | 20.6°C | 1 mm | 21% | 2.2 m/s | 6.4 |
| 2017 | 35.3°C | 28.7°C | 22.0°C | 43.3°C | 13.2°C | 17 mm | 30% | 2.4 m/s | 6.2 |
| 2016 | 35.2°C | 28.2°C | 21.2°C | 41.0°C | 13.9°C | 9 mm | 29% | 2.5 m/s | 6.1 |
| 2015 | 37.6°C | 31.1°C | 24.6°C | 41.4°C | 20.6°C | 9 mm | 33% | 2.4 m/s | 6 |
| 2014 | 36.3°C | 29.6°C | 22.9°C | 41.1°C | 16.3°C | 45 mm | 37% | 2.1 m/s | 6.2 |
| 2013 | 34.5°C | 27.7°C | 20.9°C | 41.1°C | 11.6°C | 26 mm | 38% | 2.1 m/s | 6 |
| 2012 | 37.4°C | 30.8°C | 24.2°C | 40.8°C | 20.6°C | 15 mm | 29% | 2 m/s | 6.1 |
| 2011 | 37.8°C | 30.6°C | 23.4°C | 43.6°C | 19.3°C | 29 mm | 27% | 2 m/s | 5.9 |
| 2010 | 38.9°C | 30.8°C | 22.7°C | 44.0°C | 17.9°C | 1 mm | 17% | 2.1 m/s | 6.6 |
| 2009 | 38.3°C | 30.9°C | 23.4°C | 41.7°C | 16.9°C | 6 mm | 23% | 2.5 m/s | 6.3 |
| 2008 | 37.8°C | 30.4°C | 23.1°C | 42.6°C | 17.9°C | 5 mm | 24% | 2 m/s | 6.3 |
| 2007 | 35.8°C | 28.8°C | 21.8°C | 43.4°C | 13.8°C | 14 mm | 28% | 2.4 m/s | 6.2 |
| 2006 | 35.3°C | 28.2°C | 21.0°C | 42.0°C | 13.9°C | 25 mm | 28% | 2.4 m/s | 6.4 |
| 2005 | 36.7°C | 29.1°C | 21.4°C | 41.0°C | 17.0°C | 1 mm | 21% | 2.5 m/s | 6.4 |
| 2004 | 36.3°C | 28.7°C | 21.1°C | 42.6°C | 13.4°C | 20 mm | 26% | 2.7 m/s | 6.4 |
| 2003 | 38.6°C | 31.0°C | 23.5°C | 42.1°C | 19.5°C | 15 mm | 27% | 2.2 m/s | 6.4 |
| 2002 | 37.3°C | 30.0°C | 22.6°C | 43.8°C | 15.8°C | 20 mm | 26% | 2.2 m/s | 6.1 |
| 2001 | 39.3°C | 31.6°C | 23.9°C | 41.4°C | 18.8°C | 6 mm | 21% | 2.4 m/s | 6.5 |
| 2000 | 37.3°C | 29.2°C | 21.1°C | 42.5°C | 14.3°C | 0 mm | 24% | 2.3 m/s | 6.5 |
| 1999 | 37.0°C | 29.7°C | 22.4°C | 41.3°C | 15.5°C | 23 mm | 31% | 2.2 m/s | 6.2 |
| 1998 | 35.2°C | 28.3°C | 21.5°C | 41.5°C | 14.6°C | 39 mm | 37% | 2.2 m/s | 6.3 |
| 1997 🌧️ | 36.5°C | 30.0°C | 23.5°C | 41.2°C | 18.6°C | 63 mm | 37% | 2.5 m/s | 5.8 |
| 1996 | 34.8°C | 27.8°C | 20.8°C | 41.4°C | 15.4°C | 11 mm | 31% | 2.3 m/s | 6 |
| 1995 | 38.1°C | 30.8°C | 23.5°C | 43.9°C | 15.2°C | 6 mm | 25% | 2.2 m/s | 6.4 |
| 1994 | 37.0°C | 30.1°C | 23.2°C | 41.6°C | 16.1°C | 8 mm | 26% | 2.2 m/s | 6 |
| 1993 | 36.8°C | 28.6°C | 20.5°C | 42.7°C | 14.8°C | 1 mm | 20% | 2.1 m/s | 6.6 |
| 1992 | 37.5°C | 29.9°C | 22.2°C | 39.9°C | 17.8°C | 3 mm | 25% | 2.2 m/s | 6.4 |
| 1991 | 35.7°C | 29.0°C | 22.3°C | 40.9°C | 17.3°C | 20 mm | 33% | 2.1 m/s | 6 |
| 1990 | 35.4°C | 28.7°C | 21.9°C | 43.5°C | 16.5°C | 32 mm | 34% | 1.9 m/s | 6.1 |
| 1989 | 37.0°C | 29.0°C | 21.0°C | 42.3°C | 13.1°C | 1 mm | 20% | 2.5 m/s | 6.3 |
| 1988 | 35.5°C | 27.5°C | 19.4°C | 40.5°C | 13.4°C | 2 mm | 25% | 2.4 m/s | 6.1 |
| 1987 | 36.1°C | 28.5°C | 20.8°C | 40.8°C | 15.4°C | 15 mm | 25% | 2 m/s | 6 |
| 1986 ❄️ | 32.2°C | 25.1°C | 17.9°C | 42.1°C | 9.5°C | 23 mm | 28% | 2.3 m/s | 5.9 |
| 1985 | 32.7°C | 25.6°C | 18.5°C | 39.2°C | 13.5°C | 23 mm | 30% | 2.3 m/s | 6 |
| 1984 | 36.7°C | 29.7°C | 22.6°C | 40.8°C | 17.8°C | 14 mm | 33% | 2.3 m/s | 5.9 |
| 1983 | 35.8°C | 29.5°C | 23.2°C | 41.6°C | 15.5°C | 60 mm | 42% | 2.2 m/s | — |
| 1982 | 34.6°C | 27.5°C | 20.4°C | 43.3°C | 10.3°C | 14 mm | 36% | 2.3 m/s | — |
| 1981 | 36.1°C | 29.2°C | 22.3°C | 40.3°C | 16.8°C | 38 mm | 31% | 2 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 36.6°C with lows near 22.3°C (mean 29.5°C), based on 45 years of NASA POWER data.
September averages 17 mm of rainfall in Lake Havasu City, about average for rainfall. The wettest on record was 63 mm in 1997.
The hottest September reached 46.7°C in 2020. The coldest dipped to 9.5°C in 1986.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 2.4°C. Daytime highs moved from 35.2°C to 37.5°C and overnight lows from 21.4°C to 23.9°C over the same span.
September is one of the warmer months of the year in Lake Havasu City and about average for rainfall, so plan for around 36.6°C daytime highs and 22.3°C at night.
Not quite — September is the 9th coolest month in Lake Havasu City, averaging 29.5°C.
For September in Lake Havasu City, pack light, breathable clothing and sun protection, with typical highs of 36.6°C and lows of 22.3°C.
Relative humidity in September averages 28% — relatively dry.
Average wind speed in September is 2.2 m/s. The windiest September on record averaged 2.7 m/s (2004).
The wettest September on record was 1997 with 63 mm. On average, September sees 17 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 Lake Havasu City 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.
