July is one of the warmer months of the year in Plymouth, with average highs near 25.1°C and lows around 18.2°C (mean 21.7°C). It is one of the drier months, averaging 87 mm of rainfall and 79% relative humidity across the period.
July is one of the warmer months of the year in Plymouth. Across 45 years of records, the warmest July in Plymouth was 2022 — when the month averaged 23.7°C — while the coldest was 1986 at 19.4°C. Typical July days reach 25.1°C with nights near 18.2°C. The long-term trend is warming, about 0.5°C per decade.
July is one of the drier months in Plymouth, averaging 87 mm of rainfall. The wettest July on record was 2009 with 193 mm, while the driest was 2022 at 27 mm.
Relative humidity in Plymouth during July averages 79%. The most humid July was 2013 at 86%, and the least humid was 1999 at 71%.
July receives about 5.9 kWh/m²/day of solar energy in Plymouth. The sunniest July was 2018 at 6.6 kWh/m²/day, and the cloudiest were 1990 and 2021 at 5.1.
Average wind speed in Plymouth during July is 1.9 m/s. The windiest July was 2014 at 2.2 m/s, while the calmest were 1987 and 2023 at 1.6 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 20.8°C | 21.3°C | 21.0°C | 22.6°C | 22.8°C | +2°C |
| Avg High | 24.3°C | 25.0°C | 24.4°C | 25.9°C | 26.1°C | +1.8°C |
| Avg Low | 17.3°C | 17.7°C | 17.7°C | 19.2°C | 19.5°C | +2.2°C |
| Avg Rain | 103 mm | 68 mm | 88 mm | 90 mm | 88 mm | -15 mm |
July temperatures in Plymouth have risen by about 1.7°C between 1981–1985 and 2021–2025.
July has ranged from a record low of 9.9°C (1988) to a record high of 33.7°C (2025).
Rainfall in July is one of the drier months, averaging 87 mm, with a wettest year of 193 mm.
One of the best times to visit Plymouth
July is one of the best times to visit Plymouth. Expect days averaging 25.1°C and nights around 18.2°C (mean 21.7°C) — warmer than Plymouth's yearly average — with higher rainfall (87 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 | 26.5°C | 23.0°C | 19.4°C | 33.7°C | 15.7°C | 66 mm | 77% | 1.8 m/s | 6 |
| 2024 | 25.9°C | 22.8°C | 19.8°C | 29.6°C | 15.8°C | 63 mm | 81% | 1.9 m/s | 5.5 |
| 2023 | 25.9°C | 22.9°C | 20.0°C | 29.7°C | 16.5°C | 146 mm | 85% | 1.6 m/s | 5.8 |
| 2022 🔥 | 27.5°C | 23.7°C | 19.9°C | 32.6°C | 16.3°C | 27 mm | 71% | 1.9 m/s | 6.5 |
| 2021 | 23.9°C | 21.0°C | 18.0°C | 29.0°C | 14.0°C | 183 mm | 84% | 2 m/s | 5.1 |
| 2020 | 26.7°C | 23.5°C | 20.2°C | 32.8°C | 16.1°C | 43 mm | 78% | 2 m/s | 5.9 |
| 2019 | 26.0°C | 22.9°C | 19.7°C | 29.5°C | 16.8°C | 134 mm | 82% | 1.8 m/s | 6.5 |
| 2018 | 26.0°C | 22.6°C | 19.1°C | 30.2°C | 14.7°C | 66 mm | 78% | 1.9 m/s | 6.6 |
| 2017 | 24.1°C | 21.0°C | 17.8°C | 28.6°C | 14.5°C | 84 mm | 81% | 1.9 m/s | 5.6 |
| 2016 | 26.9°C | 23.1°C | 19.2°C | 31.9°C | 15.3°C | 61 mm | 74% | 1.9 m/s | 6.4 |
| 2015 | 25.8°C | 22.3°C | 18.7°C | 32.0°C | 15.3°C | 56 mm | 78% | 1.7 m/s | 6.1 |
| 2014 | 24.6°C | 21.6°C | 18.5°C | 27.8°C | 15.9°C | 138 mm | 81% | 2.2 m/s | 5.9 |
| 2013 | 25.8°C | 23.2°C | 20.5°C | 29.1°C | 17.4°C | 89 mm | 86% | 1.9 m/s | 5.8 |
| 2012 | 26.9°C | 23.2°C | 19.6°C | 31.4°C | 16.4°C | 89 mm | 74% | 1.8 m/s | 6 |
| 2011 | 25.9°C | 22.5°C | 19.1°C | 32.0°C | 15.9°C | 101 mm | 80% | 1.9 m/s | 6.3 |
| 2010 | 26.9°C | 23.4°C | 19.9°C | 31.5°C | 14.9°C | 78 mm | 76% | 1.9 m/s | 6.4 |
| 2009 🌧️ | 23.0°C | 20.0°C | 17.0°C | 25.9°C | 13.0°C | 193 mm | 84% | 2 m/s | 5.8 |
| 2008 | 26.1°C | 22.7°C | 19.3°C | 30.6°C | 17.2°C | 112 mm | 79% | 1.9 m/s | 6.1 |
| 2007 | 24.7°C | 21.3°C | 18.0°C | 29.6°C | 13.3°C | 83 mm | 80% | 1.8 m/s | 6 |
| 2006 | 24.9°C | 21.9°C | 18.9°C | 28.4°C | 16.1°C | 67 mm | 86% | 1.9 m/s | 5.6 |
| 2005 | 24.2°C | 20.9°C | 17.7°C | 31.3°C | 14.1°C | 70 mm | 82% | 2 m/s | 5.7 |
| 2004 | 23.5°C | 20.4°C | 17.3°C | 27.2°C | 15.3°C | 73 mm | 81% | 1.9 m/s | 5.4 |
| 2003 | 24.3°C | 21.1°C | 18.0°C | 28.1°C | 15.8°C | 66 mm | 84% | 1.8 m/s | 5.8 |
| 2002 | 26.5°C | 22.3°C | 18.0°C | 33.5°C | 13.9°C | 46 mm | 72% | 2 m/s | 6.1 |
| 2001 | 23.8°C | 20.0°C | 16.3°C | 31.1°C | 12.7°C | 68 mm | 75% | 1.9 m/s | 6.4 |
| 2000 | 22.7°C | 19.5°C | 16.2°C | 26.6°C | 13.1°C | 105 mm | 80% | 1.8 m/s | 5.6 |
| 1999 | 27.3°C | 23.0°C | 18.8°C | 32.9°C | 13.9°C | 65 mm | 71% | 1.7 m/s | 6.2 |
| 1998 | 24.0°C | 20.7°C | 17.5°C | 27.2°C | 14.8°C | 41 mm | 82% | 1.7 m/s | 6.3 |
| 1997 | 25.6°C | 21.5°C | 17.4°C | 31.0°C | 14.8°C | 67 mm | 72% | 2 m/s | 6.4 |
| 1996 | 23.5°C | 20.2°C | 16.9°C | 27.2°C | 14.8°C | 113 mm | 80% | 2 m/s | 5.5 |
| 1995 | 26.0°C | 22.1°C | 18.3°C | 31.2°C | 14.7°C | 65 mm | 76% | 1.7 m/s | 5.7 |
| 1994 | 26.3°C | 22.8°C | 19.3°C | 30.8°C | 15.7°C | 36 mm | 79% | 1.8 m/s | 6 |
| 1993 | 25.5°C | 21.6°C | 17.7°C | 32.3°C | 13.4°C | 54 mm | 72% | 1.7 m/s | 6.1 |
| 1992 | 23.1°C | 19.5°C | 15.8°C | 27.7°C | 13.3°C | 74 mm | 77% | 1.7 m/s | 5.9 |
| 1991 | 25.8°C | 21.9°C | 18.0°C | 32.7°C | 14.2°C | 52 mm | 71% | 1.8 m/s | 5.6 |
| 1990 | 23.0°C | 20.2°C | 17.3°C | 27.8°C | 12.9°C | 116 mm | 84% | 1.9 m/s | 5.1 |
| 1989 | 23.4°C | 20.2°C | 16.9°C | 27.3°C | 14.0°C | 143 mm | 84% | 1.8 m/s | 5.4 |
| 1988 | 25.6°C | 21.7°C | 17.8°C | 31.0°C | 9.9°C | 156 mm | 81% | 1.8 m/s | 5.5 |
| 1987 | 24.3°C | 20.8°C | 17.2°C | 30.6°C | 14.4°C | 31 mm | 79% | 1.6 m/s | 5.2 |
| 1986 ❄️ | 22.7°C | 19.4°C | 16.2°C | 27.9°C | 11.2°C | 146 mm | 83% | 1.9 m/s | 5.8 |
| 1985 | 24.7°C | 20.9°C | 17.1°C | 28.9°C | 11.8°C | 103 mm | 76% | 1.9 m/s | 6.1 |
| 1984 | 23.2°C | 20.2°C | 17.2°C | 26.9°C | 12.9°C | 143 mm | 85% | 1.9 m/s | 5.4 |
| 1983 | 24.7°C | 21.1°C | 17.5°C | 29.0°C | 13.6°C | 43 mm | 79% | 1.9 m/s | — |
| 1982 | 24.0°C | 20.5°C | 17.0°C | 28.5°C | 11.9°C | 81 mm | 82% | 1.8 m/s | — |
| 1981 | 26.1°C | 22.2°C | 18.4°C | 31.3°C | 15.3°C | 85 mm | 74% | 1.9 m/s | — |
Actual recorded July data for each year, 1981–2025 — sourced from NASA POWER.
The average high in July is around 25.1°C with lows near 18.2°C (mean 21.7°C), based on 45 years of NASA POWER data.
July averages 87 mm of rainfall in Plymouth, one of the drier months. The wettest on record was 193 mm in 2009.
The hottest July reached 33.7°C in 2025. The coldest dipped to 9.9°C in 1988.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average July temperatures have risen by about 1.7°C. Daytime highs moved from 24.5°C to 25.9°C and overnight lows from 17.4°C to 19.4°C over the same span.
July is one of the warmer months of the year in Plymouth and one of the drier months, so plan for around 25.1°C daytime highs and 18.2°C at night.
Not quite — July is the 12th coolest month in Plymouth, averaging 21.7°C.
For July in Plymouth, pack light layers you can adjust through the day, with typical highs of 25.1°C and lows of 18.2°C. Bring an umbrella or light rain jacket too.
Relative humidity in July averages 79% — quite humid.
Average wind speed in July is 1.9 m/s. The windiest July on record averaged 2.2 m/s (2014).
The wettest July on record was 2009 with 193 mm. On average, July sees 87 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 Plymouth behaves each July, 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 July specifically, along with year-by-year records and how the month has changed over the decades.
