October is one of the warmer months of the year in Waipahu, with average highs near 27.3°C and lows around 24.5°C (mean 25.9°C). It is about average for rainfall, averaging 71 mm of rainfall and 75% relative humidity across the period.
October is one of the warmer months of the year in Waipahu. Across 45 years of records, the warmest Octobers in Waipahu were 2020, 2024 and 2025 — when the month averaged 26.9°C — while the coldest was 1983 at 24.1°C. Typical October days reach 27.3°C with nights near 24.5°C. The long-term trend is warming, about 0.3°C per decade.
October is about average for rainfall in Waipahu, averaging 71 mm of rainfall. The wettest October on record was 1982 with 515 mm, while the driest was 1998 at 7 mm.
Relative humidity in Waipahu during October averages 75%. The most humid October was 1982 at 81%, and the least humid was 2023 at 71%.
October receives about 5.3 kWh/m²/day of solar energy in Waipahu. The sunniest October was 2023 at 5.8 kWh/m²/day, and the cloudiest was 1985 at 4.7.
Average wind speed in Waipahu during October is 5.1 m/s. The windiest October was 2000 at 6.7 m/s, while the calmest was 2020 at 3.1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 25.3°C | 25.7°C | 25.9°C | 26.1°C | 26.6°C | +1.3°C |
| Avg High | 26.6°C | 27.1°C | 27.3°C | 27.5°C | 28.1°C | +1.5°C |
| Avg Low | 24.0°C | 24.4°C | 24.5°C | 24.7°C | 25.0°C | +1°C |
| Avg Rain | 129 mm | 31 mm | 62 mm | 79 mm | 51 mm | -78 mm |
October temperatures in Waipahu have risen by about 1.6°C between 1981–1985 and 2021–2025.
October has ranged from a record low of 21.4°C (1983) to a record high of 30°C (2009).
Rainfall in October is about average for rainfall, averaging 71 mm, with a wettest year of 515 mm.
A quieter season to visit Waipahu
If your dates are flexible, the more temperate months of February and March tend to be the most comfortable for visiting Waipahu. That said, October — with days averaging 27.3°C and nights around 24.5°C (mean 25.9°C) and moderate rainfall (71 mm) — can still be rewarding for travellers who don't mind the warmth, and often means fewer crowds.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 28.3°C | 26.9°C | 25.4°C | 29.4°C | 24.5°C | 27 mm | 73% | 5.2 m/s | 5.6 |
| 2024 | 28.4°C | 26.9°C | 25.3°C | 29.3°C | 24.7°C | 26 mm | 74% | 5.5 m/s | 5.6 |
| 2023 | 28.6°C | 26.8°C | 25.0°C | 29.5°C | 24.5°C | 11 mm | 71% | 3.4 m/s | 5.8 |
| 2022 | 28.1°C | 26.5°C | 24.9°C | 29.0°C | 23.2°C | 89 mm | 74% | 4.4 m/s | 5.5 |
| 2021 | 26.9°C | 25.5°C | 24.1°C | 27.7°C | 23.0°C | 74 mm | 76% | 6.2 m/s | 5.7 |
| 2020 🔥 | 28.3°C | 26.9°C | 25.4°C | 29.6°C | 23.9°C | 80 mm | 74% | 3.1 m/s | 5.1 |
| 2019 | 28.2°C | 26.8°C | 25.5°C | 29.3°C | 24.7°C | 124 mm | 77% | 4.8 m/s | 5.6 |
| 2018 | 27.3°C | 26.0°C | 24.8°C | 28.7°C | 23.8°C | 172 mm | 80% | 4.3 m/s | 5.3 |
| 2017 | 27.5°C | 26.1°C | 24.7°C | 29.4°C | 22.4°C | 92 mm | 74% | 4.8 m/s | 5.2 |
| 2016 | 27.2°C | 25.9°C | 24.6°C | 28.2°C | 23.8°C | 44 mm | 76% | 6.6 m/s | 5.4 |
| 2015 | 27.2°C | 25.9°C | 24.6°C | 28.7°C | 23.3°C | 92 mm | 79% | 4.6 m/s | 5.5 |
| 2014 | 28.2°C | 26.8°C | 25.5°C | 29.6°C | 24.8°C | 155 mm | 77% | 4.9 m/s | 5.2 |
| 2013 | 27.7°C | 26.2°C | 24.6°C | 28.7°C | 23.5°C | 50 mm | 74% | 3.9 m/s | 5.4 |
| 2012 | 27.5°C | 26.0°C | 24.4°C | 28.5°C | 23.7°C | 15 mm | 73% | 4.2 m/s | 5.6 |
| 2011 | 27.0°C | 25.6°C | 24.2°C | 28.0°C | 23.5°C | 33 mm | 73% | 5.5 m/s | 5.3 |
| 2010 | 27.4°C | 25.8°C | 24.3°C | 28.6°C | 23.4°C | 9 mm | 72% | 5.7 m/s | 5.6 |
| 2009 | 28.3°C | 26.7°C | 25.1°C | 30.0°C | 24.0°C | 25 mm | 74% | 4.1 m/s | 5.5 |
| 2008 | 27.1°C | 25.6°C | 24.2°C | 28.0°C | 23.3°C | 83 mm | 75% | 4.9 m/s | 5.1 |
| 2007 | 27.2°C | 25.8°C | 24.4°C | 28.5°C | 23.8°C | 17 mm | 73% | 6.5 m/s | 5.5 |
| 2006 | 27.5°C | 26.1°C | 24.8°C | 29.2°C | 23.4°C | 85 mm | 75% | 4.1 m/s | 5 |
| 2005 | 26.9°C | 25.6°C | 24.2°C | 28.0°C | 23.6°C | 109 mm | 76% | 6.4 m/s | 5.5 |
| 2004 | 27.9°C | 26.5°C | 25.2°C | 29.8°C | 24.2°C | 75 mm | 75% | 5.2 m/s | 5.3 |
| 2003 | 28.1°C | 26.6°C | 25.2°C | 28.7°C | 23.9°C | 46 mm | 73% | 4.6 m/s | 5.2 |
| 2002 | 27.1°C | 25.7°C | 24.2°C | 28.7°C | 23.2°C | 82 mm | 75% | 5.4 m/s | 5.1 |
| 2001 | 26.5°C | 25.2°C | 23.8°C | 27.8°C | 22.7°C | 84 mm | 75% | 6.2 m/s | 5.4 |
| 2000 | 26.7°C | 25.4°C | 24.1°C | 28.5°C | 23.4°C | 16 mm | 75% | 6.7 m/s | 5.6 |
| 1999 | 26.3°C | 25.0°C | 23.6°C | 27.4°C | 23.2°C | 40 mm | 75% | 5.5 m/s | 5.2 |
| 1998 | 26.4°C | 25.1°C | 23.8°C | 27.2°C | 23.3°C | 7 mm | 75% | 6.6 m/s | 5.6 |
| 1997 | 27.8°C | 26.4°C | 25.1°C | 29.1°C | 23.9°C | 21 mm | 71% | 5.5 m/s | 5.4 |
| 1996 | 28.1°C | 26.7°C | 25.4°C | 29.9°C | 23.9°C | 23 mm | 72% | 4.9 m/s | 5.4 |
| 1995 | 27.0°C | 25.8°C | 24.5°C | 28.3°C | 23.2°C | 25 mm | 72% | 6.4 m/s | 5.5 |
| 1994 | 27.1°C | 25.8°C | 24.5°C | 28.5°C | 23.2°C | 16 mm | 74% | 5.6 m/s | 5.3 |
| 1993 | 26.8°C | 25.5°C | 24.1°C | 29.0°C | 21.8°C | 30 mm | 74% | 5.1 m/s | 5.2 |
| 1992 | 27.2°C | 25.8°C | 24.4°C | 28.5°C | 22.8°C | 34 mm | 75% | 4.9 m/s | 4.8 |
| 1991 | 27.3°C | 25.8°C | 24.3°C | 28.9°C | 23.3°C | 17 mm | 74% | 4.6 m/s | 5.1 |
| 1990 | 26.6°C | 25.3°C | 24.0°C | 27.9°C | 23.2°C | 94 mm | 77% | 5.8 m/s | 5.3 |
| 1989 | 27.1°C | 25.8°C | 24.5°C | 28.8°C | 23.3°C | 77 mm | 76% | 3.9 m/s | 5 |
| 1988 | 27.4°C | 25.8°C | 24.3°C | 28.9°C | 23.1°C | 10 mm | 74% | 4.4 m/s | 5.4 |
| 1987 | 26.9°C | 25.7°C | 24.5°C | 28.3°C | 23.5°C | 76 mm | 76% | 5.1 m/s | 4.9 |
| 1986 | 27.4°C | 26.0°C | 24.5°C | 29.1°C | 23.1°C | 25 mm | 75% | 5.2 m/s | 5.1 |
| 1985 | 25.9°C | 24.8°C | 23.7°C | 27.2°C | 22.2°C | 258 mm | 79% | 5.1 m/s | 4.7 |
| 1984 | 27.7°C | 26.2°C | 24.7°C | 28.9°C | 23.8°C | 39 mm | 74% | 3.5 m/s | 4.8 |
| 1983 ❄️ | 25.2°C | 24.1°C | 22.9°C | 26.1°C | 21.4°C | 128 mm | 80% | 6.3 m/s | — |
| 1982 🌧️ | 25.7°C | 24.6°C | 23.6°C | 26.8°C | 22.3°C | 515 mm | 81% | 5 m/s | — |
| 1981 | 26.4°C | 25.0°C | 23.7°C | 27.5°C | 22.8°C | 35 mm | 77% | 5.1 m/s | — |
Actual recorded October data for each year, 1981–2025 — sourced from NASA POWER.
The average high in October is around 27.3°C with lows near 24.5°C (mean 25.9°C), based on 45 years of NASA POWER data.
October averages 71 mm of rainfall in Waipahu, about average for rainfall. The wettest on record was 515 mm in 1982.
The hottest October reached 30°C in 2009. The coldest dipped to 21.4°C in 1983.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average October temperatures have risen by about 1.6°C. Daytime highs moved from 26.2°C to 28.1°C and overnight lows from 23.7°C to 24.9°C over the same span.
October is one of the warmer months of the year in Waipahu and about average for rainfall, so plan for around 27.3°C daytime highs and 24.5°C at night.
Not quite — October is the 10th coolest month in Waipahu, averaging 25.9°C.
For October in Waipahu, pack light layers you can adjust through the day, with typical highs of 27.3°C and lows of 24.5°C. Bring an umbrella or light rain jacket too.
Relative humidity in October averages 75% — moderately humid.
Average wind speed in October is 5.1 m/s. The windiest October on record averaged 6.7 m/s (2000).
The wettest October on record was 1982 with 515 mm. On average, October sees 71 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 Waipahu behaves each October, 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 October specifically, along with year-by-year records and how the month has changed over the decades.
