August is one of the warmer months of the year in Guildford, with average highs near 22.1°C and lows around 13.3°C (mean 17.7°C). It is about average for rainfall, averaging 56 mm of rainfall and 76% relative humidity across the period.
August is one of the warmer months of the year in Guildford. Across 45 years of records, the warmest August in Guildford was 2022 — when the month averaged 20.7°C — while the coldest was 1986 at 15°C. Typical August days reach 22.1°C with nights near 13.3°C. The long-term trend is warming, about 0.2°C per decade.
August is about average for rainfall in Guildford, averaging 56 mm of rainfall. The wettest August on record was 1997 with 132 mm, while the driest was 1995 at 6 mm.
Relative humidity in Guildford during August averages 76%. The most humid August was 2012 at 82%, and the least humid was 1995 at 68%.
August receives about 4.3 kWh/m²/day of solar energy in Guildford. The sunniest August was 1995 at 5.2 kWh/m²/day, and the cloudiest were 1986 and 2008 at 3.6.
Average wind speed in Guildford during August is 3.4 m/s. The windiest August was 1985 at 4.4 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 | 17.0°C | 17.9°C | 17.8°C | 17.3°C | 18.8°C | +1.8°C |
| Avg High | 21.4°C | 22.5°C | 22.0°C | 21.5°C | 23.3°C | +1.9°C |
| Avg Low | 12.5°C | 13.3°C | 13.6°C | 13.1°C | 14.2°C | +1.7°C |
| Avg Rain | 46 mm | 60 mm | 53 mm | 69 mm | 49 mm | +4 mm |
August temperatures in Guildford have risen by about 1.3°C between 1981–1985 and 2021–2025.
August has ranged from a record low of 6.7°C (1986) to a record high of 32.7°C (1990).
Rainfall in August is about average for rainfall, averaging 56 mm, with a wettest year of 132 mm.
One of the best times to visit Guildford
August is one of the best times to visit Guildford. Expect days averaging 22.1°C and nights around 13.3°C (mean 17.7°C) — warmer than Guildford's yearly average — with moderate rainfall (56 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 | 18.9°C | 13.9°C | 30.5°C | 10.6°C | 25 mm | 71% | 3.4 m/s | 4.6 |
| 2024 | 23.3°C | 18.7°C | 14.0°C | 28.7°C | 10.8°C | 50 mm | 76% | 3.7 m/s | 4.3 |
| 2023 | 21.9°C | 17.6°C | 13.2°C | 25.9°C | 10.3°C | 72 mm | 80% | 3.4 m/s | 4.3 |
| 2022 🔥 | 26.0°C | 20.7°C | 15.4°C | 32.0°C | 11.5°C | 32 mm | 68% | 3.1 m/s | 4.9 |
| 2021 | 21.2°C | 17.1°C | 13.1°C | 23.2°C | 10.6°C | 43 mm | 80% | 3.6 m/s | 3.8 |
| 2020 | 23.8°C | 19.5°C | 15.3°C | 32.7°C | 10.0°C | 76 mm | 73% | 3.6 m/s | 4.1 |
| 2019 | 22.3°C | 18.2°C | 14.0°C | 29.6°C | 10.8°C | 49 mm | 76% | 3.7 m/s | 4.6 |
| 2018 | 22.9°C | 18.3°C | 13.7°C | 30.2°C | 9.0°C | 69 mm | 74% | 3.2 m/s | 4.2 |
| 2017 | 20.9°C | 16.8°C | 12.8°C | 25.8°C | 9.2°C | 73 mm | 79% | 3.3 m/s | 4.2 |
| 2016 | 22.9°C | 18.4°C | 13.8°C | 29.4°C | 9.8°C | 38 mm | 76% | 3.7 m/s | 4.7 |
| 2015 | 20.8°C | 16.9°C | 12.9°C | 26.1°C | 10.0°C | 123 mm | 80% | 3.4 m/s | 3.7 |
| 2014 | 20.4°C | 16.3°C | 12.2°C | 25.2°C | 7.7°C | 83 mm | 76% | 3.8 m/s | 4.1 |
| 2013 | 22.3°C | 17.7°C | 13.1°C | 28.0°C | 10.1°C | 46 mm | 76% | 3.3 m/s | 4.5 |
| 2012 | 20.8°C | 17.2°C | 13.5°C | 26.2°C | 7.1°C | 51 mm | 82% | 3.5 m/s | 4.1 |
| 2011 | 20.9°C | 16.7°C | 12.5°C | 26.4°C | 8.3°C | 64 mm | 77% | 3.3 m/s | 4 |
| 2010 | 20.8°C | 16.7°C | 12.6°C | 24.2°C | 8.2°C | 93 mm | 78% | 3.9 m/s | 3.8 |
| 2009 | 22.1°C | 18.0°C | 13.9°C | 27.1°C | 10.5°C | 33 mm | 78% | 3.5 m/s | 4.1 |
| 2008 | 20.7°C | 17.2°C | 13.6°C | 23.8°C | 9.3°C | 72 mm | 81% | 4.2 m/s | 3.6 |
| 2007 | 20.9°C | 16.6°C | 12.4°C | 24.5°C | 9.9°C | 39 mm | 79% | 3.5 m/s | 4.5 |
| 2006 | 21.6°C | 17.5°C | 13.4°C | 27.2°C | 10.3°C | 58 mm | 74% | 3.7 m/s | 4.1 |
| 2005 | 22.1°C | 17.4°C | 12.7°C | 27.0°C | 9.8°C | 52 mm | 75% | 2.9 m/s | 4.6 |
| 2004 | 22.2°C | 18.3°C | 14.4°C | 27.2°C | 9.5°C | 100 mm | 79% | 3.4 m/s | 4.2 |
| 2003 | 24.8°C | 19.7°C | 14.6°C | 31.1°C | 8.2°C | 25 mm | 72% | 2.7 m/s | 4.7 |
| 2002 | 22.1°C | 18.0°C | 13.8°C | 26.9°C | 11.7°C | 48 mm | 79% | 2.5 m/s | 4 |
| 2001 | 21.9°C | 17.8°C | 13.7°C | 28.2°C | 9.8°C | 67 mm | 80% | 3.4 m/s | 4.1 |
| 2000 | 21.6°C | 17.5°C | 13.4°C | 25.6°C | 10.1°C | 40 mm | 79% | 3.2 m/s | 4.4 |
| 1999 | 21.1°C | 17.2°C | 13.3°C | 27.9°C | 9.3°C | 119 mm | 80% | 3 m/s | 4.1 |
| 1998 | 22.2°C | 17.2°C | 12.2°C | 28.3°C | 8.1°C | 22 mm | 75% | 3.1 m/s | 4.9 |
| 1997 🌧️ | 23.8°C | 19.5°C | 15.3°C | 28.0°C | 12.2°C | 132 mm | 80% | 3 m/s | 4.1 |
| 1996 | 21.4°C | 17.0°C | 12.7°C | 27.1°C | 8.9°C | 74 mm | 76% | 3.3 m/s | 4.4 |
| 1995 | 25.8°C | 20.1°C | 14.4°C | 30.9°C | 10.2°C | 6 mm | 68% | 3.4 m/s | 5.2 |
| 1994 | 21.5°C | 17.3°C | 13.1°C | 26.4°C | 9.0°C | 56 mm | 76% | 3.5 m/s | 4.3 |
| 1993 | 20.7°C | 16.0°C | 11.3°C | 24.7°C | 7.1°C | 38 mm | 75% | 3.3 m/s | 4.5 |
| 1992 | 20.4°C | 16.7°C | 12.9°C | 26.7°C | 9.8°C | 100 mm | 80% | 4.2 m/s | 4 |
| 1991 | 23.1°C | 18.2°C | 13.3°C | 26.5°C | 9.7°C | 24 mm | 75% | 3 m/s | 4.7 |
| 1990 | 24.7°C | 19.5°C | 14.3°C | 32.7°C | 10.5°C | 28 mm | 69% | 3.1 m/s | 4.6 |
| 1989 | 23.2°C | 18.1°C | 13.0°C | 26.7°C | 9.2°C | 36 mm | 70% | 3.5 m/s | 4.8 |
| 1988 | 20.7°C | 16.2°C | 11.7°C | 25.6°C | 8.3°C | 30 mm | 78% | 3.6 m/s | 4.2 |
| 1987 | 21.3°C | 16.9°C | 12.5°C | 27.6°C | 8.9°C | 39 mm | 77% | 2.9 m/s | 3.8 |
| 1986 ❄️ | 19.1°C | 15.0°C | 10.9°C | 23.3°C | 6.7°C | 93 mm | 77% | 3.5 m/s | 3.6 |
| 1985 | 19.0°C | 15.3°C | 11.6°C | 22.9°C | 9.2°C | 77 mm | 81% | 4.4 m/s | 3.9 |
| 1984 | 22.9°C | 18.2°C | 13.6°C | 26.8°C | 9.9°C | 37 mm | 76% | 2.8 m/s | 4.6 |
| 1983 | 22.7°C | 18.0°C | 13.2°C | 27.5°C | 8.5°C | 24 mm | 76% | 3.2 m/s | — |
| 1982 | 21.0°C | 16.9°C | 12.8°C | 25.4°C | 8.6°C | 54 mm | 77% | 3.7 m/s | — |
| 1981 | 22.8°C | 18.0°C | 13.2°C | 27.2°C | 9.5°C | 24 mm | 75% | 2.3 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 22.1°C with lows near 13.3°C (mean 17.7°C), based on 45 years of NASA POWER data.
August averages 56 mm of rainfall in Guildford, about average for rainfall. The wettest on record was 132 mm in 1997.
The hottest August reached 32.7°C in 1990. The coldest dipped to 6.7°C in 1986.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 1.3°C. Daytime highs moved from 21.7°C to 23.3°C and overnight lows from 12.9°C to 13.9°C over the same span.
August is one of the warmer months of the year in Guildford and about average for rainfall, so plan for around 22.1°C daytime highs and 13.3°C at night.
Not quite — August is the 12th coolest month in Guildford, averaging 17.7°C.
For August in Guildford, pack light layers you can adjust through the day, with typical highs of 22.1°C and lows of 13.3°C. Bring an umbrella or light rain jacket too.
Relative humidity in August averages 76% — quite humid.
Average wind speed in August is 3.4 m/s. The windiest August on record averaged 4.4 m/s (1985).
The wettest August on record was 1997 with 132 mm. On average, August sees 56 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 Guildford 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.
