August is one of the cooler months of the year in Thames, with average highs near 14°C and lows around 9.4°C (mean 11.7°C). It is a relatively wet time of year, averaging 109 mm of rainfall and 83% relative humidity across the period.
August is one of the cooler months of the year in Thames. Across 45 years of records, the warmest August in Thames was 2022 — when the month averaged 12.8°C — while the coldest were 1992 and 2004 at 10.5°C. Typical August days reach 14°C with nights near 9.4°C. The long-term August temperature trend is broadly flat.
August is a relatively wet time of year in Thames, averaging 109 mm of rainfall. The wettest August on record was 1992 with 221 mm, while the driest was 1993 at 23 mm.
Relative humidity in Thames during August averages 83%. The most humid August was 2010 at 86%, and the least humid was 1993 at 80%.
August receives about 2.8 kWh/m²/day of solar energy in Thames. The sunniest Augusts were 2005, 2023 and 2025 at 3.1 kWh/m²/day, and the cloudiest was 2010 at 2.4.
Average wind speed in Thames during August is 3 m/s. The windiest August was 1992 at 4.1 m/s, while the calmest were 1987 and 2005 at 2.3 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 11.7°C | 11.3°C | 11.8°C | 11.9°C | 12.0°C | +0.3°C |
| Avg High | 14.0°C | 13.6°C | 14.2°C | 14.2°C | 14.3°C | +0.3°C |
| Avg Low | 9.4°C | 9.0°C | 9.5°C | 9.6°C | 9.6°C | +0.2°C |
| Avg Rain | 105 mm | 127 mm | 84 mm | 113 mm | 120 mm | +14 mm |
August temperatures in Thames have stayed relatively stable across the record.
August has ranged from a record low of 3°C (2008) to a record high of 18°C (2011).
Rainfall in August is a relatively wet time of year, averaging 109 mm, with a wettest year of 221 mm.
A quieter season to visit Thames
If your dates are flexible, the more temperate months of February and January tend to be the most comfortable for visiting Thames. That said, August — with days averaging 14°C and nights around 9.4°C (mean 11.7°C) and higher rainfall (109 mm) — can still be rewarding for travellers who don't mind the cooler conditions, and often means fewer crowds.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 13.7°C | 11.5°C | 9.2°C | 16.0°C | 4.8°C | 137 mm | 82% | 3.1 m/s | 3.1 |
| 2024 | 14.6°C | 12.2°C | 9.8°C | 17.0°C | 5.4°C | 117 mm | 85% | 2.9 m/s | 2.7 |
| 2023 | 13.5°C | 10.9°C | 8.3°C | 15.2°C | 5.1°C | 75 mm | 83% | 2.6 m/s | 3.1 |
| 2022 🔥 | 15.0°C | 12.8°C | 10.5°C | 17.6°C | 5.5°C | 127 mm | 85% | 2.6 m/s | 2.8 |
| 2021 | 14.0°C | 11.8°C | 9.5°C | 16.4°C | 4.4°C | 113 mm | 84% | 3.2 m/s | 2.7 |
| 2020 | 14.7°C | 12.5°C | 10.3°C | 16.5°C | 5.7°C | 148 mm | 84% | 3.1 m/s | 2.8 |
| 2019 | 14.1°C | 12.1°C | 10.0°C | 17.3°C | 6.0°C | 127 mm | 83% | 3.7 m/s | 2.8 |
| 2018 | 14.5°C | 12.2°C | 9.9°C | 16.6°C | 7.5°C | 112 mm | 86% | 2.7 m/s | 2.7 |
| 2017 | 14.8°C | 12.7°C | 10.5°C | 16.6°C | 7.1°C | 124 mm | 86% | 2.7 m/s | 2.7 |
| 2016 | 14.0°C | 11.6°C | 9.2°C | 17.4°C | 4.0°C | 86 mm | 82% | 2.8 m/s | 2.9 |
| 2015 | 13.7°C | 11.4°C | 9.0°C | 16.2°C | 3.4°C | 121 mm | 84% | 2.6 m/s | 2.8 |
| 2014 | 14.0°C | 11.3°C | 8.7°C | 17.3°C | 4.8°C | 100 mm | 81% | 3.1 m/s | 2.9 |
| 2013 | 14.7°C | 12.7°C | 10.6°C | 16.9°C | 7.0°C | 104 mm | 85% | 3 m/s | 2.6 |
| 2012 | 14.4°C | 12.1°C | 9.8°C | 16.1°C | 7.7°C | 126 mm | 86% | 2.6 m/s | 2.8 |
| 2011 | 13.6°C | 10.8°C | 8.0°C | 18.0°C | 3.2°C | 46 mm | 82% | 2.5 m/s | 3 |
| 2010 | 14.3°C | 12.3°C | 10.3°C | 16.6°C | 5.1°C | 182 mm | 86% | 3 m/s | 2.4 |
| 2009 | 14.7°C | 12.6°C | 10.6°C | 17.6°C | 7.7°C | 79 mm | 84% | 3.2 m/s | 2.6 |
| 2008 | 13.6°C | 11.4°C | 9.3°C | 16.0°C | 3.0°C | 117 mm | 84% | 3.3 m/s | 2.7 |
| 2007 | 14.3°C | 12.2°C | 10.0°C | 16.5°C | 6.5°C | 82 mm | 82% | 3.4 m/s | 2.7 |
| 2006 | 13.9°C | 11.5°C | 9.1°C | 16.1°C | 4.8°C | 109 mm | 84% | 2.9 m/s | 2.8 |
| 2005 | 14.8°C | 12.2°C | 9.7°C | 17.2°C | 6.8°C | 49 mm | 82% | 2.3 m/s | 3.1 |
| 2004 | 13.0°C | 10.5°C | 8.0°C | 15.4°C | 4.0°C | 87 mm | 81% | 3.2 m/s | 3 |
| 2003 | 14.2°C | 12.0°C | 9.9°C | 15.7°C | 7.2°C | 69 mm | 82% | 3 m/s | 2.8 |
| 2002 | 14.2°C | 11.7°C | 9.3°C | 15.9°C | 5.3°C | 69 mm | 82% | 3.3 m/s | 2.8 |
| 2001 | 14.6°C | 12.0°C | 9.5°C | 16.8°C | 5.9°C | 95 mm | 84% | 3 m/s | 2.6 |
| 2000 | 14.4°C | 11.9°C | 9.4°C | 16.7°C | 6.5°C | 79 mm | 81% | 2.8 m/s | 2.8 |
| 1999 | 14.2°C | 11.6°C | 9.0°C | 16.4°C | 4.9°C | 95 mm | 81% | 2.9 m/s | 2.8 |
| 1998 | 14.2°C | 12.0°C | 9.8°C | 17.0°C | 6.1°C | 93 mm | 81% | 3.1 m/s | 2.7 |
| 1997 | 13.3°C | 10.9°C | 8.4°C | 15.7°C | 4.5°C | 78 mm | 84% | 3.3 m/s | 2.7 |
| 1996 | 13.3°C | 11.1°C | 8.9°C | 16.1°C | 4.5°C | 172 mm | 84% | 3.6 m/s | 2.5 |
| 1995 | 13.5°C | 10.8°C | 8.2°C | 15.5°C | 3.4°C | 107 mm | 84% | 3.1 m/s | 2.8 |
| 1994 | 13.9°C | 11.3°C | 8.8°C | 16.2°C | 5.3°C | 112 mm | 82% | 2.9 m/s | 2.9 |
| 1993 | 13.4°C | 10.9°C | 8.3°C | 15.0°C | 4.6°C | 23 mm | 80% | 3.2 m/s | 2.8 |
| 1992 ❄️ 🌧️ | 12.6°C | 10.5°C | 8.3°C | 15.1°C | 3.4°C | 221 mm | 84% | 4.1 m/s | 2.7 |
| 1991 | 13.8°C | 11.9°C | 9.9°C | 16.0°C | 7.2°C | 178 mm | 86% | 3.5 m/s | 2.6 |
| 1990 | 14.1°C | 12.1°C | 10.0°C | 15.8°C | 7.3°C | 195 mm | 83% | 3.1 m/s | 2.7 |
| 1989 | 14.0°C | 12.0°C | 9.9°C | 16.7°C | 4.9°C | 103 mm | 81% | 3.5 m/s | 2.9 |
| 1988 | 14.3°C | 12.1°C | 9.9°C | 16.9°C | 6.7°C | 145 mm | 84% | 3.3 m/s | 2.6 |
| 1987 | 14.8°C | 12.2°C | 9.7°C | 17.2°C | 6.6°C | 86 mm | 85% | 2.3 m/s | 2.8 |
| 1986 | 13.2°C | 11.0°C | 8.8°C | 16.0°C | 5.6°C | 198 mm | 82% | 2.7 m/s | 2.9 |
| 1985 | 13.7°C | 11.4°C | 9.1°C | 15.4°C | 4.7°C | 76 mm | 81% | 3.1 m/s | 3 |
| 1984 | 14.3°C | 12.4°C | 10.5°C | 17.1°C | 6.6°C | 147 mm | 82% | 3.4 m/s | 2.7 |
| 1983 | 14.2°C | 11.6°C | 9.0°C | 16.4°C | 5.6°C | 54 mm | 83% | 2.9 m/s | — |
| 1982 | 14.1°C | 11.6°C | 9.1°C | 15.8°C | 4.7°C | 31 mm | 81% | 2.7 m/s | — |
| 1981 | 13.4°C | 11.1°C | 8.9°C | 15.6°C | 5.1°C | 107 mm | 84% | 3.1 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 14°C with lows near 9.4°C (mean 11.7°C), based on 45 years of NASA POWER data.
August averages 109 mm of rainfall in Thames, a relatively wet time of year. The wettest on record was 221 mm in 1992.
The hottest August reached 18°C in 2011. The coldest dipped to 3°C in 2008.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 0.2°C. Daytime highs moved from 13.9°C to 14.2°C and overnight lows from 9.3°C to 9.5°C over the same span.
August is one of the cooler months of the year in Thames and a relatively wet time of year, so plan for around 14°C daytime highs and 9.4°C at night.
Not quite — August is the 2nd coolest month in Thames, averaging 11.7°C.
For August in Thames, pack light layers you can adjust through the day, with typical highs of 14°C and lows of 9.4°C. Bring an umbrella or light rain jacket too.
Relative humidity in August averages 83% — quite humid.
Average wind speed in August is 3 m/s. The windiest August on record averaged 4.1 m/s (1992).
The wettest August on record was 1992 with 221 mm. On average, August sees 109 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 Thames 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.
