August is one of the warmer months of the year in Plymouth, with average highs near 24.9°C and lows around 18.1°C (mean 21.5°C). It is one of the drier months, averaging 90 mm of rainfall and 78% relative humidity across the period.
August is one of the warmer months of the year in Plymouth. Across 45 years of records, the warmest August in Plymouth was 2018 — when the month averaged 23.7°C — while the coldest was 1982 at 19.4°C. Typical August days reach 24.9°C with nights near 18.1°C. The long-term trend is warming, about 0.5°C per decade.
August is one of the drier months in Plymouth, averaging 90 mm of rainfall. The wettest August on record was 1985 with 187 mm, while the driest was 1993 at 22 mm.
Relative humidity in Plymouth during August averages 78%. The most humid August was 2003 at 83%, and the least humid was 1995 at 71%.
August receives about 5.3 kWh/m²/day of solar energy in Plymouth. The sunniest August was 2016 at 6.1 kWh/m²/day, and the cloudiest was 1996 at 4.9.
Average wind speed in Plymouth during August is 2 m/s. The windiest Augusts were 1987, 1995 and 2010 at 2.2 m/s, while the calmest were 1993, 1996 and 1998 at 1.7 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 20.6°C | 20.9°C | 21.6°C | 22.2°C | 22.3°C | +1.7°C |
| Avg High | 24.0°C | 24.4°C | 24.9°C | 25.5°C | 25.7°C | +1.7°C |
| Avg Low | 17.2°C | 17.4°C | 18.4°C | 18.9°C | 19.0°C | +1.8°C |
| Avg Rain | 97 mm | 96 mm | 86 mm | 85 mm | 84 mm | -13 mm |
August temperatures in Plymouth have risen by about 1.6°C between 1981–1985 and 2021–2025.
August has ranged from a record low of 9.6°C (1986) to a record high of 34.3°C (2002).
Rainfall in August is one of the drier months, averaging 90 mm, with a wettest year of 187 mm.
One of the best times to visit Plymouth
August is one of the best times to visit Plymouth. Expect days averaging 24.9°C and nights around 18.1°C (mean 21.5°C) — warmer than Plymouth's yearly average — with higher rainfall (90 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 | 24.9°C | 21.2°C | 17.6°C | 31.7°C | 14.7°C | 57 mm | 72% | 2.1 m/s | 5.8 |
| 2024 | 25.3°C | 21.8°C | 18.3°C | 30.8°C | 14.4°C | 78 mm | 79% | 1.9 m/s | 5.4 |
| 2023 | 23.9°C | 21.0°C | 18.2°C | 26.7°C | 15.8°C | 155 mm | 82% | 2 m/s | 5 |
| 2022 | 27.1°C | 23.6°C | 20.1°C | 32.9°C | 16.5°C | 71 mm | 76% | 1.8 m/s | 5.4 |
| 2021 | 26.5°C | 23.4°C | 20.3°C | 31.7°C | 15.0°C | 96 mm | 80% | 1.8 m/s | 5 |
| 2020 | 26.6°C | 23.1°C | 19.6°C | 30.6°C | 15.4°C | 45 mm | 73% | 2.1 m/s | 5.3 |
| 2019 | 24.9°C | 21.9°C | 19.0°C | 29.3°C | 15.4°C | 88 mm | 79% | 2 m/s | 5.5 |
| 2018 🔥 | 26.9°C | 23.7°C | 20.5°C | 32.9°C | 16.2°C | 85 mm | 80% | 1.9 m/s | 5.3 |
| 2017 | 24.5°C | 21.3°C | 18.0°C | 27.6°C | 14.7°C | 77 mm | 76% | 1.8 m/s | 5.2 |
| 2016 | 27.2°C | 23.6°C | 20.0°C | 31.4°C | 16.4°C | 47 mm | 72% | 1.9 m/s | 6.1 |
| 2015 | 26.7°C | 23.2°C | 19.6°C | 31.3°C | 16.4°C | 79 mm | 76% | 1.8 m/s | 5.9 |
| 2014 | 24.1°C | 20.7°C | 17.3°C | 27.8°C | 14.8°C | 64 mm | 77% | 1.9 m/s | 5.8 |
| 2013 | 24.2°C | 20.9°C | 17.6°C | 29.2°C | 14.5°C | 70 mm | 79% | 2 m/s | 5.2 |
| 2012 | 26.2°C | 22.8°C | 19.5°C | 29.5°C | 15.4°C | 90 mm | 78% | 1.8 m/s | 5.6 |
| 2011 | 24.7°C | 21.7°C | 18.7°C | 28.8°C | 15.4°C | 138 mm | 81% | 2.1 m/s | 5.5 |
| 2010 | 25.5°C | 22.0°C | 18.5°C | 31.5°C | 15.2°C | 112 mm | 75% | 2.2 m/s | 5.4 |
| 2009 | 25.4°C | 22.3°C | 19.1°C | 30.3°C | 14.4°C | 116 mm | 83% | 1.9 m/s | 5 |
| 2008 | 24.0°C | 20.7°C | 17.3°C | 27.2°C | 14.4°C | 101 mm | 80% | 2 m/s | 5.8 |
| 2007 | 25.3°C | 21.6°C | 17.9°C | 30.9°C | 13.2°C | 26 mm | 74% | 2 m/s | 5.3 |
| 2006 | 23.8°C | 20.8°C | 17.8°C | 29.7°C | 14.2°C | 81 mm | 81% | 2 m/s | 5.4 |
| 2005 | 26.4°C | 22.8°C | 19.3°C | 31.9°C | 16.3°C | 96 mm | 77% | 1.8 m/s | 5.3 |
| 2004 | 23.8°C | 20.7°C | 17.6°C | 28.5°C | 13.6°C | 131 mm | 82% | 2.1 m/s | 5.1 |
| 2003 | 24.9°C | 22.0°C | 19.1°C | 29.4°C | 14.6°C | 99 mm | 83% | 2 m/s | 5.2 |
| 2002 | 26.3°C | 22.6°C | 18.9°C | 34.3°C | 14.4°C | 43 mm | 73% | 2.1 m/s | 5.4 |
| 2001 | 25.7°C | 22.3°C | 19.0°C | 32.7°C | 14.7°C | 91 mm | 78% | 1.8 m/s | 5.2 |
| 2000 | 23.4°C | 20.4°C | 17.5°C | 27.7°C | 13.8°C | 79 mm | 82% | 2 m/s | 5 |
| 1999 | 24.4°C | 21.2°C | 17.9°C | 30.2°C | 13.9°C | 71 mm | 75% | 2.1 m/s | 5.2 |
| 1998 | 24.4°C | 21.0°C | 17.6°C | 27.6°C | 13.7°C | 114 mm | 79% | 1.7 m/s | 5.5 |
| 1997 | 24.0°C | 20.5°C | 17.0°C | 29.1°C | 15.1°C | 113 mm | 78% | 1.9 m/s | 5.1 |
| 1996 | 24.3°C | 20.7°C | 17.1°C | 28.7°C | 15.0°C | 79 mm | 79% | 1.7 m/s | 4.9 |
| 1995 | 25.4°C | 21.4°C | 17.4°C | 31.4°C | 15.0°C | 39 mm | 71% | 2.2 m/s | 5.7 |
| 1994 | 23.9°C | 20.3°C | 16.7°C | 29.7°C | 13.0°C | 132 mm | 77% | 2.1 m/s | 5.1 |
| 1993 | 25.4°C | 21.6°C | 17.8°C | 31.8°C | 14.8°C | 22 mm | 74% | 1.7 m/s | 5.8 |
| 1992 | 23.2°C | 19.9°C | 16.5°C | 27.6°C | 13.6°C | 156 mm | 80% | 1.9 m/s | 5.3 |
| 1991 | 24.6°C | 21.2°C | 17.8°C | 28.7°C | 13.7°C | 144 mm | 79% | 2 m/s | 5 |
| 1990 | 24.6°C | 21.6°C | 18.6°C | 28.6°C | 15.9°C | 92 mm | 81% | 1.9 m/s | 5 |
| 1989 | 23.0°C | 20.3°C | 17.5°C | 27.5°C | 12.2°C | 123 mm | 82% | 1.9 m/s | 5.1 |
| 1988 | 25.6°C | 22.1°C | 18.6°C | 31.7°C | 12.4°C | 41 mm | 77% | 2 m/s | 5 |
| 1987 | 24.1°C | 20.3°C | 16.5°C | 31.0°C | 12.5°C | 95 mm | 73% | 2.2 m/s | 5.1 |
| 1986 | 22.8°C | 19.7°C | 16.5°C | 26.2°C | 9.6°C | 117 mm | 80% | 2.1 m/s | 5.3 |
| 1985 🌧️ | 24.0°C | 20.6°C | 17.2°C | 30.5°C | 13.7°C | 187 mm | 77% | 2 m/s | 5.1 |
| 1984 | 24.4°C | 21.3°C | 18.3°C | 28.4°C | 14.6°C | 27 mm | 83% | 1.8 m/s | 5.7 |
| 1983 | 24.5°C | 20.9°C | 17.3°C | 29.1°C | 13.3°C | 147 mm | 79% | 2 m/s | — |
| 1982 ❄️ | 22.8°C | 19.4°C | 16.0°C | 27.2°C | 9.7°C | 79 mm | 78% | 2.1 m/s | — |
| 1981 | 24.9°C | 21.0°C | 17.1°C | 30.0°C | 12.5°C | 56 mm | 73% | 1.9 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 24.9°C with lows near 18.1°C (mean 21.5°C), based on 45 years of NASA POWER data.
August averages 90 mm of rainfall in Plymouth, one of the drier months. The wettest on record was 187 mm in 1985.
The hottest August reached 34.3°C in 2002. The coldest dipped to 9.6°C in 1986.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 1.6°C. Daytime highs moved from 24.1°C to 25.5°C and overnight lows from 17.2°C to 18.9°C over the same span.
August is one of the warmer months of the year in Plymouth and one of the drier months, so plan for around 24.9°C daytime highs and 18.1°C at night.
Not quite — August is the 11th coolest month in Plymouth, averaging 21.5°C.
For August in Plymouth, pack light layers you can adjust through the day, with typical highs of 24.9°C and lows of 18.1°C. Bring an umbrella or light rain jacket too.
Relative humidity in August averages 78% — quite humid.
Average wind speed in August is 2 m/s. The windiest August on record averaged 2.2 m/s (1987).
The wettest August on record was 1985 with 187 mm. On average, August sees 90 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 August, 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 August specifically, along with year-by-year records and how the month has changed over the decades.
