June is one of the warmer months of the year in New Castle, with average highs near 27.1°C and lows around 16.7°C (mean 21.9°C). It is about average for rainfall, averaging 102 mm of rainfall and 75% relative humidity across the period.
June is one of the warmer months of the year in New Castle. Across 45 years of records, the warmest June in New Castle was 2010 — when the month averaged 24.5°C — while the coldest were 1982 and 1992 at 19.6°C. Typical June days reach 27.1°C with nights near 16.7°C. The long-term trend is warming, about 0.4°C per decade.
June is about average for rainfall in New Castle, averaging 102 mm of rainfall. The wettest June on record was 2013 with 248 mm, while the driest was 1988 at 23 mm.
Relative humidity in New Castle during June averages 75%. The most humid June was 2003 at 83%, and the least humid was 1986 at 63%.
June receives about 6.2 kWh/m²/day of solar energy in New Castle. The sunniest June was 2024 at 7 kWh/m²/day, and the cloudiest was 2009 at 5.1.
Average wind speed in New Castle during June is 2.3 m/s. The windiest Junes were 1999, 2015 and 2019, among others at 2.5 m/s, while the calmest were 1983 and 2011 at 1.9 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 21.2°C | 21.4°C | 22.0°C | 22.4°C | 22.8°C | +1.6°C |
| Avg High | 26.5°C | 26.7°C | 27.0°C | 27.3°C | 28.3°C | +1.8°C |
| Avg Low | 15.9°C | 16.0°C | 17.0°C | 17.5°C | 17.4°C | +1.5°C |
| Avg Rain | 96 mm | 79 mm | 123 mm | 120 mm | 86 mm | -10 mm |
June temperatures in New Castle have risen by about 2°C between 1981–1985 and 2021–2025.
June has ranged from a record low of 6.7°C (1986) to a record high of 37.6°C (2025).
Rainfall in June is about average for rainfall, averaging 102 mm, with a wettest year of 248 mm.
One of the best times to visit New Castle
June is one of the best times to visit New Castle. Expect days averaging 27.1°C and nights around 16.7°C (mean 21.9°C) — warmer than New Castle's yearly average — with higher rainfall (102 mm), so conditions are generally comfortable for sightseeing and outdoor plans.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 29.1°C | 23.7°C | 18.2°C | 37.6°C | 8.5°C | 64 mm | 76% | 2.1 m/s | 5.7 |
| 2024 | 29.6°C | 24.0°C | 18.4°C | 36.4°C | 11.7°C | 103 mm | 71% | 2.4 m/s | 7 |
| 2023 | 26.6°C | 21.0°C | 15.4°C | 32.4°C | 10.7°C | 111 mm | 73% | 2.4 m/s | 5.9 |
| 2022 | 28.1°C | 22.6°C | 17.1°C | 33.5°C | 11.7°C | 86 mm | 70% | 2.3 m/s | 6.5 |
| 2021 | 28.1°C | 22.9°C | 17.8°C | 35.7°C | 10.9°C | 81 mm | 77% | 2.3 m/s | 6.4 |
| 2020 | 28.0°C | 22.7°C | 17.3°C | 32.5°C | 8.2°C | 71 mm | 73% | 2.4 m/s | 6.8 |
| 2019 | 26.7°C | 22.1°C | 17.5°C | 31.7°C | 9.3°C | 170 mm | 79% | 2.5 m/s | 6.5 |
| 2018 | 26.3°C | 21.6°C | 16.9°C | 32.8°C | 10.9°C | 94 mm | 81% | 2.3 m/s | 6 |
| 2017 | 27.7°C | 22.4°C | 17.2°C | 32.8°C | 11.1°C | 75 mm | 72% | 2.4 m/s | 6.6 |
| 2016 | 26.7°C | 21.6°C | 16.5°C | 31.2°C | 9.5°C | 72 mm | 76% | 2.3 m/s | 6.6 |
| 2015 | 26.7°C | 22.5°C | 18.3°C | 31.0°C | 12.4°C | 236 mm | 83% | 2.5 m/s | 5.8 |
| 2014 | 26.4°C | 21.8°C | 17.2°C | 30.3°C | 11.1°C | 89 mm | 80% | 2.1 m/s | 6.5 |
| 2013 🌧️ | 26.7°C | 22.1°C | 17.5°C | 30.9°C | 11.4°C | 248 mm | 82% | 2.3 m/s | 6 |
| 2012 | 28.2°C | 22.5°C | 16.8°C | 35.9°C | 10.8°C | 94 mm | 68% | 2.3 m/s | 6.6 |
| 2011 | 28.2°C | 23.1°C | 18.0°C | 32.7°C | 10.6°C | 64 mm | 74% | 1.9 m/s | 6.2 |
| 2010 🔥 | 29.8°C | 24.5°C | 19.1°C | 34.9°C | 12.7°C | 54 mm | 70% | 2.3 m/s | 6.5 |
| 2009 | 25.3°C | 21.1°C | 16.8°C | 29.0°C | 8.6°C | 146 mm | 83% | 2.2 m/s | 5.1 |
| 2008 | 28.2°C | 23.2°C | 18.2°C | 33.3°C | 12.7°C | 76 mm | 78% | 2.1 m/s | 6.6 |
| 2007 | 27.2°C | 22.1°C | 17.1°C | 33.1°C | 11.8°C | 87 mm | 75% | 2.1 m/s | 6.2 |
| 2006 | 27.0°C | 22.1°C | 17.3°C | 33.4°C | 9.3°C | 221 mm | 74% | 2.3 m/s | 5.7 |
| 2005 | 27.8°C | 22.6°C | 17.4°C | 32.9°C | 11.4°C | 68 mm | 78% | 2.3 m/s | 6.1 |
| 2004 | 26.0°C | 21.2°C | 16.4°C | 30.6°C | 10.8°C | 119 mm | 79% | 2.1 m/s | 5.9 |
| 2003 | 24.9°C | 20.2°C | 15.6°C | 32.5°C | 7.7°C | 188 mm | 83% | 2 m/s | 5.2 |
| 2002 | 28.8°C | 22.9°C | 17.0°C | 35.4°C | 11.3°C | 86 mm | 68% | 2.2 m/s | 6.4 |
| 2001 | 27.5°C | 22.4°C | 17.2°C | 33.0°C | 10.5°C | 125 mm | 74% | 2.1 m/s | 6.5 |
| 2000 | 26.8°C | 21.8°C | 16.8°C | 30.9°C | 10.4°C | 111 mm | 79% | 2.4 m/s | 5.5 |
| 1999 | 28.2°C | 22.3°C | 16.4°C | 34.6°C | 11.9°C | 68 mm | 67% | 2.5 m/s | 6 |
| 1998 | 25.3°C | 20.8°C | 16.2°C | 31.3°C | 9.3°C | 109 mm | 80% | 2.4 m/s | 5.5 |
| 1997 | 26.6°C | 21.0°C | 15.4°C | 34.6°C | 8.6°C | 60 mm | 71% | 2.4 m/s | 6.1 |
| 1996 | 26.1°C | 21.2°C | 16.3°C | 29.7°C | 8.6°C | 159 mm | 82% | 2.3 m/s | 5.9 |
| 1995 | 27.4°C | 21.8°C | 16.2°C | 34.5°C | 12.2°C | 59 mm | 72% | 2.5 m/s | 5.6 |
| 1994 | 28.3°C | 22.8°C | 17.2°C | 34.6°C | 8.3°C | 64 mm | 74% | 2.4 m/s | 5.9 |
| 1993 | 26.2°C | 20.9°C | 15.6°C | 31.2°C | 7.2°C | 54 mm | 75% | 2.2 m/s | 6.4 |
| 1992 | 25.0°C | 19.6°C | 14.2°C | 29.8°C | 8.7°C | 75 mm | 75% | 2.2 m/s | 6.6 |
| 1991 | 28.3°C | 22.5°C | 16.7°C | 35.1°C | 11.3°C | 62 mm | 67% | 2.1 m/s | 6.2 |
| 1990 | 25.6°C | 20.6°C | 15.6°C | 29.9°C | 8.2°C | 77 mm | 79% | 2.4 m/s | 6.2 |
| 1989 | 26.0°C | 22.0°C | 18.0°C | 29.7°C | 12.0°C | 186 mm | 83% | 2.2 m/s | 5.5 |
| 1988 | 26.6°C | 20.6°C | 14.7°C | 34.8°C | 7.5°C | 23 mm | 67% | 2.4 m/s | 6.9 |
| 1987 | 27.4°C | 22.0°C | 16.7°C | 32.3°C | 9.2°C | 64 mm | 76% | 2.3 m/s | 6.4 |
| 1986 | 28.5°C | 22.1°C | 15.8°C | 33.3°C | 6.7°C | 56 mm | 63% | 2.5 m/s | 6.8 |
| 1985 | 26.1°C | 20.6°C | 15.0°C | 31.1°C | 11.0°C | 67 mm | 69% | 2.5 m/s | 5.8 |
| 1984 | 26.1°C | 21.2°C | 16.3°C | 31.1°C | 7.0°C | 108 mm | 82% | 2.2 m/s | 5.7 |
| 1983 | 25.5°C | 20.4°C | 15.2°C | 30.3°C | 8.8°C | 115 mm | 80% | 1.9 m/s | — |
| 1982 ❄️ | 24.3°C | 19.6°C | 14.9°C | 28.7°C | 10.2°C | 138 mm | 80% | 2.3 m/s | — |
| 1981 | 27.6°C | 22.1°C | 16.6°C | 33.7°C | 11.8°C | 110 mm | 74% | 2.4 m/s | — |
Actual recorded June data for each year, 1981–2025 — sourced from NASA POWER.
The average high in June is around 27.1°C with lows near 16.7°C (mean 21.9°C), based on 45 years of NASA POWER data.
June averages 102 mm of rainfall in New Castle, about average for rainfall. The wettest on record was 248 mm in 2013.
The hottest June reached 37.6°C in 2025. The coldest dipped to 6.7°C in 1986.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average June temperatures have risen by about 2°C. Daytime highs moved from 25.9°C to 28.3°C and overnight lows from 15.6°C to 17.4°C over the same span.
June is one of the warmer months of the year in New Castle and about average for rainfall, so plan for around 27.1°C daytime highs and 16.7°C at night.
Not quite — June is the 10th coolest month in New Castle, averaging 21.9°C.
For June in New Castle, pack light layers you can adjust through the day, with typical highs of 27.1°C and lows of 16.7°C. Bring an umbrella or light rain jacket too.
Relative humidity in June averages 75% — quite humid.
Average wind speed in June is 2.3 m/s. The windiest June on record averaged 2.5 m/s (1985).
The wettest June on record was 2013 with 248 mm. On average, June sees 102 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 June, 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 June specifically, along with year-by-year records and how the month has changed over the decades.
