October is one of the warmer months of the year in Harpenden, with average highs near 14.7°C and lows around 7°C (mean 10.9°C). It is a relatively wet time of year, averaging 73 mm of rainfall and 87% relative humidity across the period.
October is one of the warmer months of the year in Harpenden. Across 45 years of records, the warmest October in Harpenden was 2005 — when the month averaged 13.3°C — while the coldest was 1992 at 7.4°C. Typical October days reach 14.7°C with nights near 7°C. The long-term trend is warming, about 0.4°C per decade.
October is a relatively wet time of year in Harpenden, averaging 73 mm of rainfall. The wettest October on record was 2020 with 160 mm, while the driest was 2017 at 25 mm.
Relative humidity in Harpenden during October averages 87%. The most humid October was 2020 at 90%, and the least humid was 2011 at 83%.
October receives about 1.9 kWh/m²/day of solar energy in Harpenden. The sunniest Octobers were 2011 and 2022 at 2.2 kWh/m²/day, and the cloudiest was 2000 at 1.5.
Average wind speed in Harpenden during October is 3.5 m/s. The windiest October was 1998 at 4.8 m/s, while the calmest was 2007 at 2.3 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 10.3°C | 10.2°C | 11.1°C | 11.2°C | 11.9°C | +1.6°C |
| Avg High | 14.2°C | 14.1°C | 14.9°C | 15.1°C | 15.7°C | +1.5°C |
| Avg Low | 6.5°C | 6.3°C | 7.3°C | 7.3°C | 8.0°C | +1.5°C |
| Avg Rain | 71 mm | 65 mm | 75 mm | 65 mm | 95 mm | +24 mm |
October temperatures in Harpenden have risen by about 2.2°C between 1981–1985 and 2021–2025.
October has ranged from a record low of -3.9°C (2008) to a record high of 27.4°C (2011).
Rainfall in October is a relatively wet time of year, averaging 73 mm, with a wettest year of 160 mm.
A good time to visit Harpenden
October is a good time to visit Harpenden, with days averaging 14.7°C and nights around 7°C (mean 10.9°C, close to Harpenden's yearly average) and moderate rainfall. July and August 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 | 15.3°C | 11.6°C | 7.9°C | 20.8°C | 2.9°C | 57 mm | 87% | 3.5 m/s | 1.6 |
| 2024 | 15.4°C | 11.5°C | 7.5°C | 20.3°C | 0.7°C | 73 mm | 90% | 3 m/s | 1.8 |
| 2023 | 16.3°C | 12.6°C | 8.9°C | 22.7°C | 2.7°C | 105 mm | 88% | 2.9 m/s | 2 |
| 2022 | 17.8°C | 13.2°C | 8.7°C | 20.1°C | 3.4°C | 83 mm | 85% | 3.5 m/s | 2.2 |
| 2021 | 15.9°C | 11.9°C | 7.9°C | 20.9°C | 4.1°C | 92 mm | 88% | 3.6 m/s | 1.9 |
| 2020 🌧️ | 13.6°C | 10.3°C | 7.0°C | 17.1°C | 4.3°C | 160 mm | 90% | 3.9 m/s | 1.6 |
| 2019 | 14.1°C | 10.2°C | 6.3°C | 18.7°C | 1.9°C | 93 mm | 89% | 3.5 m/s | 1.8 |
| 2018 | 15.5°C | 10.9°C | 6.4°C | 23.6°C | -0.8°C | 53 mm | 86% | 3.4 m/s | 2.1 |
| 2017 | 15.9°C | 12.1°C | 8.2°C | 21.0°C | 1.9°C | 25 mm | 87% | 4 m/s | 1.8 |
| 2016 | 14.6°C | 10.8°C | 6.9°C | 18.4°C | 4.5°C | 30 mm | 87% | 2.8 m/s | 2 |
| 2015 | 14.7°C | 10.7°C | 6.7°C | 18.7°C | 1.3°C | 65 mm | 89% | 2.8 m/s | 1.8 |
| 2014 | 16.2°C | 12.4°C | 8.7°C | 20.6°C | 3.3°C | 83 mm | 88% | 3.7 m/s | 1.8 |
| 2013 | 15.7°C | 12.2°C | 8.7°C | 20.9°C | 4.4°C | 106 mm | 89% | 4.1 m/s | 1.7 |
| 2012 | 13.1°C | 9.5°C | 6.0°C | 17.1°C | 0.3°C | 95 mm | 89% | 3.3 m/s | 1.8 |
| 2011 | 17.1°C | 13.0°C | 8.9°C | 27.4°C | 0.9°C | 29 mm | 83% | 4 m/s | 2.2 |
| 2010 | 14.0°C | 10.1°C | 6.3°C | 20.0°C | -0.2°C | 71 mm | 89% | 3.4 m/s | 2 |
| 2009 | 15.3°C | 11.4°C | 7.5°C | 21.3°C | 3.3°C | 39 mm | 86% | 2.9 m/s | 1.8 |
| 2008 | 13.7°C | 9.4°C | 5.2°C | 21.1°C | -3.9°C | 62 mm | 87% | 3.7 m/s | 2.1 |
| 2007 | 14.9°C | 11.0°C | 7.1°C | 19.6°C | 0.6°C | 51 mm | 89% | 2.3 m/s | 1.8 |
| 2006 | 17.1°C | 13.0°C | 9.0°C | 20.4°C | 3.7°C | 80 mm | 88% | 3.6 m/s | 1.8 |
| 2005 🔥 | 17.1°C | 13.3°C | 9.6°C | 21.4°C | 5.0°C | 77 mm | 88% | 3.5 m/s | 1.7 |
| 2004 | 14.0°C | 10.5°C | 7.0°C | 17.8°C | 2.8°C | 92 mm | 88% | 4 m/s | 1.7 |
| 2003 | 13.2°C | 9.0°C | 4.9°C | 18.8°C | 0.1°C | 42 mm | 84% | 3.5 m/s | 2.1 |
| 2002 | 13.6°C | 10.0°C | 6.4°C | 20.5°C | 1.8°C | 97 mm | 88% | 3.4 m/s | 1.8 |
| 2001 | 16.6°C | 13.1°C | 9.6°C | 21.7°C | 5.4°C | 91 mm | 90% | 4 m/s | 1.7 |
| 2000 | 13.3°C | 9.9°C | 6.6°C | 17.5°C | 4.5°C | 122 mm | 90% | 3.9 m/s | 1.5 |
| 1999 | 14.5°C | 10.6°C | 6.6°C | 20.0°C | 1.4°C | 63 mm | 87% | 3.5 m/s | 2.1 |
| 1998 | 13.6°C | 10.0°C | 6.4°C | 18.5°C | 1.1°C | 110 mm | 87% | 4.8 m/s | 1.6 |
| 1997 | 14.1°C | 9.8°C | 5.5°C | 23.2°C | -3.4°C | 68 mm | 86% | 3 m/s | 2.1 |
| 1996 | 15.4°C | 11.5°C | 7.6°C | 19.4°C | 4.1°C | 58 mm | 85% | 3.8 m/s | 2.1 |
| 1995 | 17.2°C | 12.8°C | 8.3°C | 23.4°C | 2.4°C | 26 mm | 87% | 3.4 m/s | 2 |
| 1994 | 13.9°C | 9.9°C | 5.9°C | 18.0°C | -0.3°C | 74 mm | 88% | 3.1 m/s | 2.1 |
| 1993 | 12.0°C | 8.4°C | 4.8°C | 16.9°C | -2.6°C | 83 mm | 88% | 3.2 m/s | 1.9 |
| 1992 ❄️ | 10.6°C | 7.4°C | 4.1°C | 16.4°C | -1.8°C | 78 mm | 87% | 3.5 m/s | 1.9 |
| 1991 | 13.7°C | 9.9°C | 6.2°C | 21.4°C | 1.7°C | 36 mm | 86% | 3.2 m/s | 1.8 |
| 1990 | 15.9°C | 11.9°C | 7.9°C | 23.4°C | 1.4°C | 56 mm | 84% | 4 m/s | 1.8 |
| 1989 | 15.7°C | 11.8°C | 7.9°C | 19.7°C | 5.5°C | 66 mm | 85% | 3.9 m/s | 1.7 |
| 1988 | 14.3°C | 10.6°C | 6.9°C | 19.0°C | -1.3°C | 54 mm | 88% | 3.3 m/s | 1.9 |
| 1987 | 13.8°C | 9.9°C | 5.9°C | 20.0°C | -0.9°C | 135 mm | 88% | 3.3 m/s | 1.9 |
| 1986 | 14.9°C | 10.8°C | 6.7°C | 20.6°C | 2.5°C | 65 mm | 88% | 3.4 m/s | 1.9 |
| 1985 | 14.8°C | 10.9°C | 7.0°C | 24.9°C | 3.7°C | 27 mm | 88% | 2.8 m/s | 2 |
| 1984 | 15.3°C | 11.1°C | 7.0°C | 21.0°C | 0.4°C | 61 mm | 86% | 3.9 m/s | 1.8 |
| 1983 | 13.8°C | 10.1°C | 6.3°C | 22.5°C | -2.6°C | 44 mm | 87% | 4.1 m/s | — |
| 1982 | 13.4°C | 9.8°C | 6.3°C | 17.8°C | 2.5°C | 102 mm | 90% | 3.1 m/s | — |
| 1981 | 11.5°C | 8.0°C | 4.4°C | 18.0°C | -1.0°C | 87 mm | 87% | 3.9 m/s | — |
Actual recorded October data for each year, 1981–2025 — sourced from NASA POWER.
The average high in October is around 14.7°C with lows near 7°C (mean 10.9°C), based on 45 years of NASA POWER data.
October averages 73 mm of rainfall in Harpenden, a relatively wet time of year. The wettest on record was 160 mm in 2020.
The hottest October reached 27.4°C in 2011. The coldest dipped to -3.9°C in 2008.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average October temperatures have risen by about 2.2°C. Daytime highs moved from 13.8°C to 16.1°C and overnight lows from 6.2°C to 8.2°C over the same span.
October is one of the warmer months of the year in Harpenden and a relatively wet time of year, so plan for around 14.7°C daytime highs and 7°C at night.
Not quite — October is the 7th coolest month in Harpenden, averaging 10.9°C.
For October in Harpenden, pack warm layers and a jacket for chilly mornings, with typical highs of 14.7°C and lows of 7°C. Bring an umbrella or light rain jacket too.
Relative humidity in October averages 87% — quite humid.
Average wind speed in October is 3.5 m/s. The windiest October on record averaged 4.8 m/s (1998).
The wettest October on record was 2020 with 160 mm. On average, October sees 73 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 Harpenden 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.
