August is one of the warmer months of the year in Plymouth, with average highs near 18.9°C and lows around 13.3°C (mean 16.1°C). It is one of the drier months, averaging 82 mm of rainfall and 85% 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 1995 — when the month averaged 19.1°C — while the coldest was 1986 at 13.3°C. Typical August days reach 18.9°C with nights near 13.3°C. The long-term trend is warming, about 0.2°C per decade.
August is one of the drier months in Plymouth, averaging 82 mm of rainfall. The wettest August on record was 2015 with 199 mm, while the driest was 1995 at 15 mm.
Relative humidity in Plymouth during August averages 85%. The most humid August was 2008 at 88%, and the least humid was 2022 at 75%.
August receives about 4.6 kWh/m²/day of solar energy in Plymouth. The sunniest Augusts were 1995, 2005 and 2022 at 5.2 kWh/m²/day, and the cloudiest was 2008 at 3.8.
Average wind speed in Plymouth during August is 3.9 m/s. The windiest August was 1985 at 5 m/s, while the calmest was 1981 at 2.8 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 15.7°C | 16.3°C | 16.0°C | 15.8°C | 17.0°C | +1.3°C |
| Avg High | 18.6°C | 19.3°C | 18.7°C | 18.4°C | 20.0°C | +1.4°C |
| Avg Low | 12.7°C | 13.3°C | 13.3°C | 13.2°C | 14.0°C | +1.3°C |
| Avg Rain | 68 mm | 78 mm | 74 mm | 111 mm | 72 mm | +4 mm |
August temperatures in Plymouth have risen by about 0.9°C between 1981–1985 and 2021–2025.
August has ranged from a record low of 8.5°C (1986) to a record high of 29°C (2022).
Rainfall in August is one of the drier months, averaging 82 mm, with a wettest year of 199 mm.
One of the best times to visit Plymouth
August is one of the best times to visit Plymouth. Expect days averaging 18.9°C and nights around 13.3°C (mean 16.1°C) — warmer than Plymouth's yearly average — with higher rainfall (82 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 | 20.6°C | 17.5°C | 14.4°C | 24.4°C | 11.7°C | 56 mm | 81% | 3.9 m/s | 4.7 |
| 2024 | 19.2°C | 16.5°C | 13.8°C | 22.4°C | 11.1°C | 73 mm | 86% | 4.2 m/s | 4.5 |
| 2023 | 18.9°C | 16.3°C | 13.7°C | 22.4°C | 11.7°C | 89 mm | 87% | 4.1 m/s | 4.5 |
| 2022 | 22.8°C | 18.9°C | 15.0°C | 29.0°C | 11.3°C | 35 mm | 75% | 3.3 m/s | 5.2 |
| 2021 | 18.7°C | 15.8°C | 12.9°C | 21.0°C | 11.0°C | 54 mm | 87% | 3.8 m/s | 4.6 |
| 2020 | 19.5°C | 16.9°C | 14.3°C | 24.2°C | 10.0°C | 124 mm | 86% | 4.2 m/s | 4.4 |
| 2019 | 19.1°C | 16.4°C | 13.8°C | 22.1°C | 11.8°C | 108 mm | 86% | 4.3 m/s | 4.8 |
| 2018 | 19.4°C | 16.6°C | 13.8°C | 24.2°C | 10.5°C | 94 mm | 83% | 3.7 m/s | 4.2 |
| 2017 | 17.9°C | 15.4°C | 12.9°C | 22.3°C | 11.2°C | 96 mm | 86% | 3.9 m/s | 4.6 |
| 2016 | 19.0°C | 16.2°C | 13.5°C | 21.3°C | 11.0°C | 92 mm | 87% | 4.1 m/s | 4.7 |
| 2015 🌧️ | 17.7°C | 15.1°C | 12.5°C | 20.8°C | 10.1°C | 199 mm | 86% | 3.9 m/s | 4.4 |
| 2014 | 17.5°C | 15.1°C | 12.7°C | 20.3°C | 9.0°C | 118 mm | 82% | 4.4 m/s | 4.9 |
| 2013 | 19.4°C | 16.5°C | 13.7°C | 21.9°C | 11.2°C | 81 mm | 84% | 3.7 m/s | 4.8 |
| 2012 | 18.2°C | 16.0°C | 13.9°C | 22.2°C | 9.6°C | 145 mm | 88% | 4.5 m/s | 4.3 |
| 2011 | 17.3°C | 14.9°C | 12.4°C | 19.5°C | 9.6°C | 85 mm | 84% | 3.7 m/s | 4.5 |
| 2010 | 18.1°C | 15.4°C | 12.7°C | 20.6°C | 8.8°C | 95 mm | 86% | 4.2 m/s | 4.4 |
| 2009 | 18.2°C | 15.9°C | 13.5°C | 20.3°C | 11.2°C | 65 mm | 87% | 4.2 m/s | 4.3 |
| 2008 | 17.7°C | 15.5°C | 13.4°C | 20.2°C | 9.8°C | 136 mm | 88% | 4.8 m/s | 3.8 |
| 2007 | 18.3°C | 15.4°C | 12.5°C | 22.3°C | 10.4°C | 71 mm | 85% | 4.2 m/s | 5.1 |
| 2006 | 18.3°C | 15.9°C | 13.4°C | 22.3°C | 11.3°C | 52 mm | 84% | 4.3 m/s | 4.8 |
| 2005 | 18.8°C | 15.7°C | 12.6°C | 21.7°C | 10.5°C | 46 mm | 85% | 3.6 m/s | 5.2 |
| 2004 | 19.0°C | 16.4°C | 13.9°C | 22.6°C | 10.8°C | 143 mm | 86% | 4 m/s | 4.7 |
| 2003 | 20.6°C | 17.4°C | 14.1°C | 24.4°C | 9.3°C | 44 mm | 85% | 3.1 m/s | 4.6 |
| 2002 | 18.3°C | 15.5°C | 12.7°C | 20.1°C | 10.7°C | 56 mm | 87% | 3.3 m/s | 4.5 |
| 2001 | 18.8°C | 16.1°C | 13.4°C | 22.1°C | 10.2°C | 60 mm | 87% | 3.8 m/s | 4.4 |
| 2000 | 18.7°C | 16.2°C | 13.6°C | 21.8°C | 11.4°C | 65 mm | 86% | 3.7 m/s | 4.3 |
| 1999 | 18.7°C | 16.2°C | 13.6°C | 21.9°C | 10.1°C | 150 mm | 87% | 3.5 m/s | 4.5 |
| 1998 | 18.8°C | 15.5°C | 12.2°C | 22.3°C | 10.1°C | 41 mm | 86% | 3.7 m/s | 5 |
| 1997 | 20.4°C | 17.9°C | 15.4°C | 23.0°C | 12.5°C | 128 mm | 88% | 3.2 m/s | 4 |
| 1996 | 18.1°C | 15.2°C | 12.3°C | 22.1°C | 9.9°C | 84 mm | 85% | 3.9 m/s | 4.7 |
| 1995 🔥 | 23.0°C | 19.1°C | 15.2°C | 27.1°C | 12.0°C | 15 mm | 75% | 3.4 m/s | 5.2 |
| 1994 | 18.2°C | 15.6°C | 13.0°C | 21.0°C | 8.7°C | 108 mm | 85% | 3.9 m/s | 4.3 |
| 1993 | 17.5°C | 14.6°C | 11.7°C | 20.0°C | 9.3°C | 38 mm | 85% | 3.5 m/s | 4.8 |
| 1992 | 17.7°C | 15.1°C | 12.6°C | 20.3°C | 9.2°C | 139 mm | 85% | 4.5 m/s | 4.1 |
| 1991 | 19.5°C | 16.3°C | 13.0°C | 22.4°C | 10.4°C | 30 mm | 85% | 3.5 m/s | 4.6 |
| 1990 | 20.6°C | 17.3°C | 14.0°C | 28.3°C | 11.3°C | 46 mm | 81% | 3.5 m/s | 4.6 |
| 1989 | 20.1°C | 16.8°C | 13.5°C | 23.4°C | 10.2°C | 47 mm | 79% | 3.9 m/s | 5 |
| 1988 | 17.5°C | 14.8°C | 12.0°C | 22.7°C | 9.5°C | 81 mm | 85% | 4.1 m/s | 4.3 |
| 1987 | 18.7°C | 15.7°C | 12.7°C | 22.8°C | 9.2°C | 30 mm | 84% | 3.4 m/s | 4.7 |
| 1986 ❄️ | 15.7°C | 13.3°C | 10.8°C | 18.8°C | 8.5°C | 140 mm | 85% | 4.1 m/s | 4.3 |
| 1985 | 16.5°C | 14.3°C | 12.1°C | 20.0°C | 10.2°C | 140 mm | 87% | 5 m/s | 4.5 |
| 1984 | 20.8°C | 17.4°C | 14.0°C | 24.5°C | 10.2°C | 57 mm | 81% | 3.1 m/s | 4.8 |
| 1983 | 20.6°C | 17.1°C | 13.7°C | 22.9°C | 10.3°C | 27 mm | 82% | 3.3 m/s | — |
| 1982 | 17.9°C | 15.4°C | 12.8°C | 21.8°C | 10.3°C | 68 mm | 85% | 4.2 m/s | — |
| 1981 | 19.6°C | 16.3°C | 13.0°C | 22.8°C | 10.2°C | 24 mm | 85% | 2.8 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 18.9°C with lows near 13.3°C (mean 16.1°C), based on 45 years of NASA POWER data.
August averages 82 mm of rainfall in Plymouth, one of the drier months. The wettest on record was 199 mm in 2015.
The hottest August reached 29°C in 2022. The coldest dipped to 8.5°C in 1986.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 0.9°C. Daytime highs moved from 19.1°C to 20°C and overnight lows from 13.1°C to 14°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 18.9°C daytime highs and 13.3°C at night.
Not quite — August is the 12th coolest month in Plymouth, averaging 16.1°C.
For August in Plymouth, pack light layers you can adjust through the day, with typical highs of 18.9°C and lows of 13.3°C. Bring an umbrella or light rain jacket too.
Relative humidity in August averages 85% — quite humid.
Average wind speed in August is 3.9 m/s. The windiest August on record averaged 5 m/s (1985).
The wettest August on record was 2015 with 199 mm. On average, August sees 82 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.
