August is one of the warmer months of the year in Bristol, with average highs near 21.4°C and lows around 12.3°C (mean 16.9°C). It is about average for rainfall, averaging 63 mm of rainfall and 79% relative humidity across the period.
August is one of the warmer months of the year in Bristol. Across 45 years of records, the warmest August in Bristol was 1995 — when the month averaged 20.1°C — while the coldest was 1986 at 14.1°C. Typical August days reach 21.4°C with nights near 12.3°C. The long-term August temperature trend is broadly flat.
August is about average for rainfall in Bristol, averaging 63 mm of rainfall. The wettest August on record was 1999 with 132 mm, while the driest was 1995 at 7 mm.
Relative humidity in Bristol during August averages 79%. The most humid August was 2012 at 84%, and the least humid was 1995 at 66%.
August receives about 4.3 kWh/m²/day of solar energy in Bristol. The sunniest August was 1995 at 5.4 kWh/m²/day, and the cloudiest was 2008 at 3.4.
Average wind speed in Bristol during August is 3.1 m/s. The windiest August was 1985 at 4.3 m/s, while the calmest was 1981 at 2.3 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 16.3°C | 17.2°C | 16.9°C | 16.4°C | 17.8°C | +1.5°C |
| Avg High | 20.9°C | 22.0°C | 21.3°C | 20.7°C | 22.6°C | +1.7°C |
| Avg Low | 11.7°C | 12.4°C | 12.4°C | 12.1°C | 13.0°C | +1.3°C |
| Avg Rain | 55 mm | 64 mm | 59 mm | 80 mm | 54 mm | -2 mm |
August temperatures in Bristol have risen by about 1°C between 1981–1985 and 2021–2025.
August has ranged from a record low of 6.3°C (1993) to a record high of 34°C (1990).
Rainfall in August is about average for rainfall, averaging 63 mm, with a wettest year of 132 mm.
One of the best times to visit Bristol
August is one of the best times to visit Bristol. Expect days averaging 21.4°C and nights around 12.3°C (mean 16.9°C) — warmer than Bristol's yearly average — with moderate rainfall (63 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 | 23.9°C | 18.6°C | 13.3°C | 32.2°C | 10.3°C | 34 mm | 72% | 3.2 m/s | 4.6 |
| 2024 | 21.9°C | 17.3°C | 12.7°C | 28.5°C | 8.9°C | 56 mm | 80% | 3.5 m/s | 4 |
| 2023 | 21.2°C | 16.7°C | 12.3°C | 25.1°C | 9.8°C | 65 mm | 83% | 3.2 m/s | 3.9 |
| 2022 | 25.5°C | 19.7°C | 13.8°C | 33.0°C | 9.1°C | 16 mm | 68% | 2.6 m/s | 5 |
| 2021 | 20.6°C | 16.3°C | 12.0°C | 22.5°C | 9.0°C | 48 mm | 82% | 3.1 m/s | 4 |
| 2020 | 22.5°C | 18.1°C | 13.7°C | 32.1°C | 8.0°C | 102 mm | 79% | 3.4 m/s | 3.9 |
| 2019 | 21.7°C | 17.3°C | 12.9°C | 27.1°C | 9.9°C | 78 mm | 80% | 3.6 m/s | 4.5 |
| 2018 | 22.2°C | 17.5°C | 12.7°C | 28.0°C | 8.0°C | 82 mm | 78% | 3.1 m/s | 4.1 |
| 2017 | 19.7°C | 15.8°C | 11.8°C | 24.3°C | 8.7°C | 69 mm | 82% | 3.1 m/s | 4.3 |
| 2016 | 21.6°C | 17.1°C | 12.6°C | 26.9°C | 8.9°C | 72 mm | 81% | 3.3 m/s | 4.4 |
| 2015 | 20.1°C | 15.9°C | 11.7°C | 26.2°C | 9.1°C | 122 mm | 81% | 3.2 m/s | 3.7 |
| 2014 | 19.3°C | 15.1°C | 11.0°C | 22.6°C | 6.6°C | 92 mm | 80% | 3.6 m/s | 4.3 |
| 2013 | 21.9°C | 17.2°C | 12.5°C | 29.0°C | 9.5°C | 38 mm | 78% | 3.1 m/s | 4.3 |
| 2012 | 20.2°C | 16.5°C | 12.7°C | 24.3°C | 6.9°C | 85 mm | 84% | 3.3 m/s | 3.9 |
| 2011 | 20.0°C | 15.8°C | 11.6°C | 25.6°C | 8.1°C | 70 mm | 79% | 3 m/s | 4 |
| 2010 | 20.5°C | 16.0°C | 11.5°C | 24.1°C | 6.9°C | 91 mm | 79% | 3.4 m/s | 4 |
| 2009 | 20.7°C | 16.6°C | 12.4°C | 24.0°C | 9.5°C | 59 mm | 82% | 3.5 m/s | 4 |
| 2008 | 20.0°C | 16.3°C | 12.6°C | 24.6°C | 8.3°C | 92 mm | 84% | 3.8 m/s | 3.4 |
| 2007 | 20.0°C | 15.5°C | 11.1°C | 24.7°C | 8.3°C | 43 mm | 82% | 3.2 m/s | 4.7 |
| 2006 | 21.1°C | 16.8°C | 12.5°C | 26.0°C | 9.4°C | 48 mm | 77% | 3.5 m/s | 4.2 |
| 2005 | 21.9°C | 16.9°C | 11.9°C | 27.2°C | 8.4°C | 43 mm | 76% | 2.9 m/s | 4.9 |
| 2004 | 21.8°C | 17.5°C | 13.2°C | 27.5°C | 8.7°C | 108 mm | 81% | 3 m/s | 4.3 |
| 2003 | 24.4°C | 18.9°C | 13.5°C | 31.7°C | 6.8°C | 20 mm | 74% | 2.5 m/s | 4.6 |
| 2002 | 21.3°C | 16.9°C | 12.4°C | 24.6°C | 10.6°C | 40 mm | 81% | 2.4 m/s | 4.1 |
| 2001 | 21.1°C | 16.8°C | 12.4°C | 25.3°C | 8.9°C | 77 mm | 82% | 2.9 m/s | 3.9 |
| 2000 | 21.1°C | 16.8°C | 12.4°C | 26.8°C | 9.3°C | 61 mm | 81% | 2.9 m/s | 4.3 |
| 1999 🌧️ | 20.5°C | 16.5°C | 12.6°C | 26.4°C | 8.3°C | 132 mm | 83% | 2.5 m/s | 4.1 |
| 1998 | 21.0°C | 16.0°C | 11.1°C | 27.0°C | 7.8°C | 33 mm | 80% | 3.1 m/s | 4.8 |
| 1997 | 23.5°C | 19.0°C | 14.6°C | 28.8°C | 11.8°C | 122 mm | 80% | 2.8 m/s | 4 |
| 1996 | 21.5°C | 16.6°C | 11.7°C | 28.7°C | 8.2°C | 57 mm | 77% | 3.1 m/s | 4.5 |
| 1995 🔥 | 26.2°C | 20.1°C | 14.0°C | 31.9°C | 9.2°C | 7 mm | 66% | 2.9 m/s | 5.4 |
| 1994 | 20.9°C | 16.5°C | 12.0°C | 25.7°C | 7.4°C | 61 mm | 77% | 3.3 m/s | 4.4 |
| 1993 | 19.8°C | 15.1°C | 10.4°C | 23.5°C | 6.3°C | 38 mm | 78% | 3 m/s | 4.4 |
| 1992 | 19.8°C | 15.8°C | 11.7°C | 24.9°C | 7.6°C | 131 mm | 79% | 3.8 m/s | 4 |
| 1991 | 22.9°C | 17.6°C | 12.3°C | 27.0°C | 8.4°C | 21 mm | 76% | 3 m/s | 4.7 |
| 1990 | 24.1°C | 18.7°C | 13.3°C | 34.0°C | 10.1°C | 34 mm | 73% | 3 m/s | 4.5 |
| 1989 | 22.3°C | 17.2°C | 12.1°C | 26.5°C | 8.1°C | 35 mm | 74% | 3.5 m/s | 4.7 |
| 1988 | 19.9°C | 15.4°C | 10.9°C | 27.4°C | 7.2°C | 45 mm | 79% | 3.5 m/s | 4.1 |
| 1987 | 21.2°C | 16.5°C | 11.7°C | 27.5°C | 7.1°C | 26 mm | 77% | 2.9 m/s | 4.1 |
| 1986 ❄️ | 18.2°C | 14.1°C | 10.0°C | 22.1°C | 6.4°C | 112 mm | 79% | 3.3 m/s | 3.5 |
| 1985 | 18.4°C | 14.8°C | 11.1°C | 23.4°C | 8.3°C | 95 mm | 83% | 4.3 m/s | 3.9 |
| 1984 | 23.5°C | 18.4°C | 13.4°C | 29.5°C | 8.4°C | 46 mm | 73% | 2.6 m/s | 4.6 |
| 1983 | 22.6°C | 17.5°C | 12.4°C | 28.9°C | 7.4°C | 25 mm | 77% | 2.7 m/s | — |
| 1982 | 20.1°C | 16.0°C | 11.9°C | 25.6°C | 8.5°C | 60 mm | 80% | 3.5 m/s | — |
| 1981 | 21.8°C | 17.0°C | 12.2°C | 26.1°C | 7.8°C | 54 mm | 80% | 2.3 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 21.4°C with lows near 12.3°C (mean 16.9°C), based on 45 years of NASA POWER data.
August averages 63 mm of rainfall in Bristol, about average for rainfall. The wettest on record was 132 mm in 1999.
The hottest August reached 34°C in 1990. The coldest dipped to 6.3°C in 1993.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 1°C. Daytime highs moved from 21.3°C to 22.6°C and overnight lows from 12.2°C to 12.8°C over the same span.
August is one of the warmer months of the year in Bristol and about average for rainfall, so plan for around 21.4°C daytime highs and 12.3°C at night.
Not quite — August is the 11th coolest month in Bristol, averaging 16.9°C.
For August in Bristol, pack light layers you can adjust through the day, with typical highs of 21.4°C and lows of 12.3°C. Bring an umbrella or light rain jacket too.
Relative humidity in August averages 79% — quite humid.
Average wind speed in August is 3.1 m/s. The windiest August on record averaged 4.3 m/s (1985).
The wettest August on record was 1999 with 132 mm. On average, August sees 63 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 Bristol 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.
