October is one of the cooler months of the year in Hamilton, with average highs near 18.2°C and lows around 6.4°C (mean 12.3°C). It is about average for rainfall, averaging 56 mm of rainfall and 75% relative humidity across the period.
October is one of the cooler months of the year in Hamilton. Across 45 years of records, the warmest October in Hamilton was 2015 — when the month averaged 17.2°C — while the coldest was 2003 at 10.2°C. Typical October days reach 18.2°C with nights near 6.4°C. The long-term trend is warming, about 0.4°C per decade.
October is about average for rainfall in Hamilton, averaging 56 mm of rainfall. The wettest October on record was 2022 with 149 mm, while the driest was 2015 at 9 mm.
Relative humidity in Hamilton during October averages 75%. The most humid October was 2022 at 83%, and the least humid was 2015 at 57%.
October receives about 5.3 kWh/m²/day of solar energy in Hamilton. The sunniest October was 2006 at 6.4 kWh/m²/day, and the cloudiest were 2001 and 2022 at 4.6.
Average wind speed in Hamilton during October is 3 m/s. The windiest Octobers were 1988 and 2016 at 3.8 m/s, while the calmest was 2012 at 2.6 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 11.6°C | 12.0°C | 12.1°C | 13.2°C | 12.6°C | +1°C |
| Avg High | 17.3°C | 17.8°C | 18.1°C | 19.5°C | 18.5°C | +1.2°C |
| Avg Low | 5.9°C | 6.3°C | 6.2°C | 6.9°C | 6.8°C | +0.9°C |
| Avg Rain | 59 mm | 59 mm | 50 mm | 42 mm | 79 mm | +20 mm |
October temperatures in Hamilton have risen by about 0.9°C between 1981–1985 and 2021–2025.
October has ranged from a record low of 0.2°C (1989) to a record high of 33.3°C (2015).
Rainfall in October is about average for rainfall, averaging 56 mm, with a wettest year of 149 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.6°C per decade while lows rose 0.3°C per decade, widening the gap between day and night.
A good time to visit Hamilton
October is a good time to visit Hamilton, with days averaging 18.2°C and nights around 6.4°C (mean 12.3°C, cooler than Hamilton's yearly average) and moderate rainfall. February and January are marginally more temperate, but October still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 19.0°C | 13.0°C | 7.1°C | 28.8°C | 3.3°C | 68 mm | 73% | 3.4 m/s | 5.1 |
| 2024 | 21.0°C | 14.3°C | 7.6°C | 28.1°C | 2.2°C | 38 mm | 68% | 3 m/s | 5.7 |
| 2023 | 19.4°C | 12.8°C | 6.3°C | 28.0°C | 3.2°C | 41 mm | 67% | 3.3 m/s | 5.7 |
| 2022 🌧️ | 17.3°C | 12.5°C | 7.7°C | 23.5°C | 3.4°C | 149 mm | 83% | 2.8 m/s | 4.6 |
| 2021 | 17.2°C | 11.6°C | 5.9°C | 27.8°C | 0.9°C | 77 mm | 78% | 2.8 m/s | 5.2 |
| 2020 | 17.2°C | 11.7°C | 6.2°C | 25.6°C | 1.7°C | 100 mm | 82% | 2.9 m/s | 4.8 |
| 2019 | 20.8°C | 14.1°C | 7.3°C | 32.7°C | 1.7°C | 34 mm | 67% | 3 m/s | 5.5 |
| 2018 | 20.8°C | 14.2°C | 7.5°C | 28.3°C | 3.5°C | 27 mm | 68% | 3 m/s | 5.5 |
| 2017 | 20.1°C | 13.7°C | 7.3°C | 30.0°C | 4.4°C | 39 mm | 73% | 2.8 m/s | 5.4 |
| 2016 | 16.8°C | 11.1°C | 5.5°C | 24.0°C | 1.6°C | 65 mm | 74% | 3.8 m/s | 5.3 |
| 2015 🔥 | 25.4°C | 17.2°C | 8.9°C | 33.3°C | 3.8°C | 9 mm | 57% | 2.8 m/s | 6.1 |
| 2014 | 20.9°C | 14.2°C | 7.6°C | 32.1°C | 3.7°C | 20 mm | 71% | 2.9 m/s | 5.7 |
| 2013 | 16.6°C | 11.5°C | 6.4°C | 24.5°C | 2.8°C | 81 mm | 81% | 3.3 m/s | 4.9 |
| 2012 | 17.9°C | 11.9°C | 6.0°C | 28.4°C | 2.5°C | 39 mm | 76% | 2.6 m/s | 5.2 |
| 2011 | 18.2°C | 12.5°C | 6.8°C | 27.7°C | 1.3°C | 38 mm | 78% | 2.8 m/s | 4.8 |
| 2010 | 17.6°C | 11.9°C | 6.1°C | 24.8°C | 2.2°C | 68 mm | 80% | 2.7 m/s | 5.3 |
| 2009 | 17.4°C | 11.8°C | 6.2°C | 31.2°C | 1.8°C | 39 mm | 79% | 2.9 m/s | 5.4 |
| 2008 | 20.4°C | 13.5°C | 6.7°C | 31.3°C | 2.5°C | 17 mm | 69% | 2.8 m/s | 5.5 |
| 2007 | 18.2°C | 12.2°C | 6.1°C | 28.4°C | 1.0°C | 33 mm | 74% | 3.1 m/s | 5.4 |
| 2006 | 21.3°C | 13.4°C | 5.5°C | 33.1°C | 1.3°C | 13 mm | 61% | 3 m/s | 6.4 |
| 2005 | 18.6°C | 12.8°C | 6.9°C | 25.8°C | 2.6°C | 75 mm | 75% | 2.8 m/s | 5.3 |
| 2004 | 18.8°C | 12.7°C | 6.7°C | 28.3°C | 3.1°C | 24 mm | 75% | 2.8 m/s | 5.7 |
| 2003 ❄️ | 15.2°C | 10.2°C | 5.1°C | 25.5°C | 1.7°C | 78 mm | 81% | 3 m/s | 4.8 |
| 2002 | 18.6°C | 12.6°C | 6.6°C | 27.5°C | 1.7°C | 50 mm | 73% | 3.3 m/s | 5 |
| 2001 | 15.5°C | 10.8°C | 6.1°C | 23.0°C | 2.6°C | 101 mm | 82% | 3.3 m/s | 4.6 |
| 2000 | 16.6°C | 11.3°C | 6.1°C | 24.2°C | 2.2°C | 75 mm | 81% | 2.8 m/s | 5 |
| 1999 | 20.1°C | 13.9°C | 7.7°C | 28.2°C | 2.9°C | 47 mm | 70% | 2.9 m/s | 5.4 |
| 1998 | 16.6°C | 11.2°C | 5.9°C | 25.6°C | 1.0°C | 62 mm | 77% | 3 m/s | 5.3 |
| 1997 | 19.3°C | 12.9°C | 6.6°C | 30.8°C | 2.1°C | 75 mm | 71% | 3.2 m/s | 5.3 |
| 1996 | 17.5°C | 11.6°C | 5.8°C | 25.4°C | 1.6°C | 29 mm | 80% | 3 m/s | 5.6 |
| 1995 | 16.5°C | 10.9°C | 5.3°C | 22.6°C | 1.6°C | 35 mm | 79% | 3.2 m/s | 5.1 |
| 1994 | 18.3°C | 12.1°C | 5.8°C | 27.4°C | 1.8°C | 69 mm | 73% | 3 m/s | 5.6 |
| 1993 | 16.9°C | 11.1°C | 5.4°C | 22.2°C | 1.9°C | 82 mm | 77% | 3.1 m/s | 5.3 |
| 1992 | 17.1°C | 11.9°C | 6.8°C | 25.3°C | 1.8°C | 104 mm | 83% | 2.8 m/s | 5.1 |
| 1991 | 18.3°C | 12.7°C | 7.2°C | 25.4°C | 3.3°C | 16 mm | 79% | 3 m/s | 5.7 |
| 1990 | 17.6°C | 12.0°C | 6.5°C | 29.2°C | 1.0°C | 67 mm | 80% | 2.9 m/s | 5.3 |
| 1989 | 16.1°C | 10.8°C | 5.6°C | 21.6°C | 0.2°C | 92 mm | 81% | 3.4 m/s | 5.3 |
| 1988 | 17.2°C | 11.9°C | 6.7°C | 24.5°C | 3.5°C | 52 mm | 78% | 3.8 m/s | 5.4 |
| 1987 | 17.3°C | 11.3°C | 5.4°C | 31.5°C | 0.6°C | 54 mm | 77% | 2.9 m/s | 5.4 |
| 1986 | 15.2°C | 10.4°C | 5.7°C | 22.6°C | 2.6°C | 112 mm | 82% | 3.4 m/s | 4.8 |
| 1985 | 18.5°C | 12.2°C | 5.9°C | 23.5°C | 1.1°C | 82 mm | 75% | 3.2 m/s | 5.5 |
| 1984 | 17.6°C | 11.6°C | 5.6°C | 23.3°C | 1.6°C | 29 mm | 78% | 2.9 m/s | 5.7 |
| 1983 | 17.0°C | 11.6°C | 6.2°C | 23.0°C | 1.8°C | 37 mm | 81% | 2.7 m/s | — |
| 1982 | 19.4°C | 12.6°C | 5.8°C | 30.1°C | 1.4°C | 30 mm | 65% | 3.2 m/s | — |
| 1981 | 17.6°C | 11.7°C | 5.9°C | 25.0°C | 2.3°C | 46 mm | 78% | 2.9 m/s | — |
Actual recorded October data for each year, 1981–2025 — sourced from NASA POWER.
The average high in October is around 18.2°C with lows near 6.4°C (mean 12.3°C), based on 45 years of NASA POWER data.
October averages 56 mm of rainfall in Hamilton, about average for rainfall. The wettest on record was 149 mm in 2022.
The hottest October reached 33.3°C in 2015. The coldest dipped to 0.2°C in 1989.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average October temperatures have risen by about 0.9°C. Daytime highs moved from 18°C to 18.8°C and overnight lows from 5.9°C to 6.9°C over the same span.
October is one of the cooler months of the year in Hamilton and about average for rainfall, so plan for around 18.2°C daytime highs and 6.4°C at night.
Not quite — October is the 6th coolest month in Hamilton, averaging 12.3°C.
For October in Hamilton, pack warm layers and a jacket for chilly mornings, with typical highs of 18.2°C and lows of 6.4°C. Bring an umbrella or light rain jacket too.
Relative humidity in October averages 75% — quite humid.
Average wind speed in October is 3 m/s. The windiest October on record averaged 3.8 m/s (1988).
The wettest October on record was 2022 with 149 mm. On average, October sees 56 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 Hamilton 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.
