October is one of the warmer months of the year in New Castle, with average highs near 17.4°C and lows around 5.5°C (mean 11.5°C). It is about average for rainfall, averaging 74 mm of rainfall and 76% relative humidity across the period.
October is one of the warmer months of the year in New Castle. Across 45 years of records, the warmest October in New Castle was 2021 — when the month averaged 15.5°C — while the coldest was 1988 at 7.2°C. Typical October days reach 17.4°C with nights near 5.5°C. The long-term trend is warming, about 0.5°C per decade.
October is about average for rainfall in New Castle, averaging 74 mm of rainfall. The wettest October on record was 2012 with 137 mm, while the driest was 2024 at 25 mm.
Relative humidity in New Castle during October averages 76%. The most humid October was 2004 at 83%, and the least humid was 2024 at 68%.
October receives about 2.8 kWh/m²/day of solar energy in New Castle. The sunniest October was 2024 at 3.5 kWh/m²/day, and the cloudiest were 1984 and 2009 at 2.2.
Average wind speed in New Castle during October is 0.1 m/s. The windiest Octobers were 2023, 2024 and 2025, among others at 0.1 m/s, while the calmest were 2016, 2018 and 2022, among others at 0 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 10.7°C | 10.9°C | 11.2°C | 12.1°C | 12.6°C | +1.9°C |
| Avg High | 16.7°C | 17.2°C | 16.9°C | 17.8°C | 18.8°C | +2.1°C |
| Avg Low | 4.8°C | 4.6°C | 5.4°C | 6.4°C | 6.5°C | +1.7°C |
| Avg Rain | 66 mm | 67 mm | 74 mm | 89 mm | 74 mm | +8 mm |
October temperatures in New Castle have risen by about 1°C between 1981–1985 and 2021–2025.
October has ranged from a record low of -5.5°C (1988) to a record high of 32.1°C (2019).
Rainfall in October is about average for rainfall, averaging 74 mm, with a wettest year of 137 mm.
A good time to visit New Castle
October is a good time to visit New Castle, with days averaging 17.4°C and nights around 5.5°C (mean 11.5°C, warmer than New Castle's yearly average) and moderate rainfall. August and July 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 | 12.3°C | 5.7°C | 29.7°C | -0.3°C | 95 mm | 71% | 0.1 m/s | 3.4 |
| 2024 | 20.6°C | 13.2°C | 5.9°C | 28.4°C | -0.7°C | 25 mm | 68% | 0.1 m/s | 3.5 |
| 2023 | 18.6°C | 12.8°C | 7.1°C | 30.8°C | -1.0°C | 78 mm | 74% | 0.1 m/s | 2.6 |
| 2022 | 16.9°C | 10.4°C | 3.8°C | 24.2°C | -1.5°C | 48 mm | 69% | 0 m/s | 3.2 |
| 2021 🔥 | 20.9°C | 15.5°C | 10.0°C | 28.8°C | 3.6°C | 99 mm | 80% | 0.1 m/s | 2.6 |
| 2020 | 16.9°C | 11.6°C | 6.2°C | 26.0°C | -3.4°C | 96 mm | 77% | 0.1 m/s | 2.7 |
| 2019 | 19.3°C | 13.0°C | 6.7°C | 32.1°C | 0.3°C | 119 mm | 75% | 0.1 m/s | 2.9 |
| 2018 | 17.0°C | 11.7°C | 6.4°C | 29.4°C | -2.0°C | 80 mm | 82% | 0 m/s | 2.5 |
| 2017 | 20.5°C | 14.3°C | 8.1°C | 28.3°C | -1.2°C | 77 mm | 74% | 0.1 m/s | 2.8 |
| 2016 | 19.2°C | 13.2°C | 7.2°C | 27.1°C | -0.1°C | 89 mm | 78% | 0 m/s | 2.9 |
| 2015 | 17.4°C | 11.5°C | 5.7°C | 24.5°C | -2.9°C | 82 mm | 73% | 0.1 m/s | 2.9 |
| 2014 | 17.1°C | 11.8°C | 6.5°C | 26.7°C | 0.6°C | 64 mm | 77% | 0.1 m/s | 2.6 |
| 2013 | 18.2°C | 12.5°C | 6.7°C | 28.2°C | -1.6°C | 74 mm | 78% | 0 m/s | 2.9 |
| 2012 🌧️ | 16.2°C | 11.0°C | 5.7°C | 26.7°C | -2.3°C | 137 mm | 80% | 0 m/s | 2.4 |
| 2011 | 15.8°C | 10.8°C | 5.7°C | 25.9°C | -1.7°C | 101 mm | 82% | 0.1 m/s | 2.4 |
| 2010 | 17.2°C | 11.3°C | 5.4°C | 27.0°C | -0.6°C | 70 mm | 73% | 0.1 m/s | 2.8 |
| 2009 | 15.0°C | 9.6°C | 4.2°C | 21.3°C | -3.1°C | 79 mm | 79% | 0 m/s | 2.2 |
| 2008 | 16.4°C | 10.1°C | 3.7°C | 28.9°C | -4.0°C | 59 mm | 71% | 0.1 m/s | 3.1 |
| 2007 | 20.7°C | 14.8°C | 8.9°C | 31.7°C | -2.0°C | 64 mm | 73% | 0.1 m/s | 2.8 |
| 2006 | 14.7°C | 9.5°C | 4.4°C | 25.0°C | -2.2°C | 120 mm | 81% | 0.1 m/s | 2.4 |
| 2005 | 17.7°C | 12.2°C | 6.7°C | 29.0°C | -1.5°C | 75 mm | 79% | 0.1 m/s | 2.6 |
| 2004 | 16.8°C | 11.3°C | 5.8°C | 22.7°C | -0.7°C | 64 mm | 83% | 0.1 m/s | 2.7 |
| 2003 | 15.3°C | 9.4°C | 3.5°C | 23.8°C | -2.3°C | 70 mm | 80% | 0.1 m/s | 2.9 |
| 2002 | 15.8°C | 10.4°C | 4.9°C | 28.4°C | -3.1°C | 61 mm | 77% | 0.1 m/s | 2.4 |
| 2001 | 17.9°C | 11.9°C | 6.0°C | 27.2°C | -2.0°C | 94 mm | 69% | 0 m/s | 2.8 |
| 2000 | 18.9°C | 12.4°C | 5.9°C | 25.9°C | -1.9°C | 50 mm | 75% | 0.1 m/s | 3 |
| 1999 | 17.6°C | 10.9°C | 4.1°C | 24.5°C | -1.6°C | 44 mm | 71% | 0 m/s | 3 |
| 1998 | 18.2°C | 11.8°C | 5.4°C | 27.0°C | -1.1°C | 80 mm | 74% | 0 m/s | 2.9 |
| 1997 | 17.8°C | 11.1°C | 4.4°C | 29.3°C | -2.1°C | 28 mm | 72% | 0.1 m/s | 3 |
| 1996 | 16.3°C | 10.4°C | 4.5°C | 22.9°C | -0.6°C | 97 mm | 80% | 0 m/s | 2.8 |
| 1995 | 18.2°C | 12.0°C | 5.8°C | 26.5°C | -1.0°C | 126 mm | 75% | 0.1 m/s | 2.7 |
| 1994 | 17.5°C | 10.8°C | 4.1°C | 24.3°C | -1.3°C | 33 mm | 73% | 0.1 m/s | 3 |
| 1993 | 16.2°C | 9.9°C | 3.5°C | 26.7°C | -2.6°C | 75 mm | 73% | 0 m/s | 2.8 |
| 1992 | 15.2°C | 9.2°C | 3.2°C | 22.9°C | -4.7°C | 52 mm | 78% | 0.1 m/s | 2.7 |
| 1991 | 18.6°C | 11.9°C | 5.2°C | 26.7°C | -1.9°C | 33 mm | 69% | 0.1 m/s | 2.9 |
| 1990 | 16.7°C | 11.2°C | 5.7°C | 25.0°C | -2.9°C | 104 mm | 81% | 0.1 m/s | 2.7 |
| 1989 | 17.1°C | 11.1°C | 5.1°C | 26.4°C | -0.6°C | 64 mm | 75% | 0.1 m/s | 2.8 |
| 1988 ❄️ | 12.4°C | 7.2°C | 1.9°C | 28.2°C | -5.5°C | 65 mm | 75% | 0 m/s | 2.6 |
| 1987 | 13.7°C | 7.8°C | 1.8°C | 20.2°C | -3.2°C | 60 mm | 75% | 0.1 m/s | 2.8 |
| 1986 | 16.7°C | 11.4°C | 6.0°C | 25.2°C | -1.2°C | 85 mm | 81% | 0 m/s | 2.4 |
| 1985 | 18.3°C | 12.0°C | 5.8°C | 25.0°C | -3.7°C | 52 mm | 71% | 0 m/s | 2.6 |
| 1984 | 20.2°C | 14.1°C | 8.0°C | 25.2°C | 1.8°C | 73 mm | 79% | 0.1 m/s | 2.2 |
| 1983 | 17.2°C | 11.3°C | 5.5°C | 26.7°C | -3.6°C | 105 mm | 77% | 0 m/s | — |
| 1982 | 18.7°C | 12.2°C | 5.8°C | 26.9°C | -4.3°C | 27 mm | 70% | 0.1 m/s | — |
| 1981 | 15.6°C | 9.6°C | 3.6°C | 22.8°C | -3.8°C | 60 mm | 75% | 0 m/s | — |
Actual recorded October data for each year, 1981–2025 — sourced from NASA POWER.
The average high in October is around 17.4°C with lows near 5.5°C (mean 11.5°C), based on 45 years of NASA POWER data.
October averages 74 mm of rainfall in New Castle, about average for rainfall. The wettest on record was 137 mm in 2012.
The hottest October reached 32.1°C in 2019. The coldest dipped to -5.5°C in 1988.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average October temperatures have risen by about 1°C. Daytime highs moved from 18°C to 19.2°C and overnight lows from 5.7°C to 6.5°C over the same span.
October is one of the warmer months of the year in New Castle and about average for rainfall, so plan for around 17.4°C daytime highs and 5.5°C at night.
Not quite — October is the 7th coolest month in New Castle, averaging 11.5°C.
For October in New Castle, pack warm layers and a jacket for chilly mornings, with typical highs of 17.4°C and lows of 5.5°C. Bring an umbrella or light rain jacket too.
Relative humidity in October averages 76% — quite humid.
Average wind speed in October is 0.1 m/s. The windiest October on record averaged 0.1 m/s (1982).
The wettest October on record was 2012 with 137 mm. On average, October sees 74 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 New Castle 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.
