August is one of the warmer months of the year in Conwy, with average highs near 17.1°C and lows around 14.1°C (mean 15.6°C). It is about average for rainfall, averaging 80 mm of rainfall and 85% relative humidity across the period.
August is one of the warmer months of the year in Conwy. Across 45 years of records, the warmest August in Conwy was 1995 — when the month averaged 17.4°C — while the coldest was 1986 at 13.2°C. Typical August days reach 17.1°C with nights near 14.1°C. The long-term trend is warming, about 0.3°C per decade.
August is about average for rainfall in Conwy, averaging 80 mm of rainfall. The wettest August on record was 2004 with 182 mm, while the driest was 1995 at 14 mm.
Relative humidity in Conwy during August averages 85%. The most humid August was 2002 at 88%, and the least humid was 2022 at 81%.
August receives about 4.1 kWh/m²/day of solar energy in Conwy. The sunniest August was 1995 at 5 kWh/m²/day, and the cloudiest was 2008 at 3.4.
Average wind speed in Conwy during August is 4.6 m/s. The windiest August was 1985 at 6.4 m/s, while the calmest was 1984 at 3.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 15.0°C | 15.5°C | 15.7°C | 15.5°C | 16.5°C | +1.5°C |
| Avg High | 16.5°C | 17.2°C | 17.1°C | 17.0°C | 18.1°C | +1.6°C |
| Avg Low | 13.5°C | 13.9°C | 14.3°C | 14.0°C | 14.9°C | +1.4°C |
| Avg Rain | 80 mm | 65 mm | 90 mm | 88 mm | 77 mm | -2 mm |
August temperatures in Conwy have risen by about 1.1°C between 1981–1985 and 2021–2025.
August has ranged from a record low of 10.2°C (1986) to a record high of 24.5°C (1990).
Rainfall in August is about average for rainfall, averaging 80 mm, with a wettest year of 182 mm.
One of the best times to visit Conwy
August is one of the best times to visit Conwy. Expect days averaging 17.1°C and nights around 14.1°C (mean 15.6°C) — warmer than Conwy's yearly average — with higher rainfall (80 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 | 18.8°C | 17.0°C | 15.2°C | 22.7°C | 13.4°C | 37 mm | 82% | 4.6 m/s | 4.3 |
| 2024 | 17.7°C | 16.2°C | 14.6°C | 20.7°C | 12.3°C | 74 mm | 84% | 5.7 m/s | 4 |
| 2023 | 17.4°C | 16.1°C | 14.8°C | 21.6°C | 12.7°C | 120 mm | 85% | 5 m/s | 4.2 |
| 2022 | 19.1°C | 17.3°C | 15.5°C | 24.5°C | 13.2°C | 37 mm | 81% | 3.6 m/s | 4.7 |
| 2021 | 17.2°C | 15.8°C | 14.5°C | 19.1°C | 13.0°C | 57 mm | 85% | 4.1 m/s | 3.9 |
| 2020 | 18.1°C | 16.5°C | 14.9°C | 22.1°C | 11.5°C | 138 mm | 85% | 4.6 m/s | 3.9 |
| 2019 | 17.8°C | 16.3°C | 14.8°C | 21.2°C | 12.8°C | 110 mm | 85% | 5.3 m/s | 4.1 |
| 2018 | 17.4°C | 15.9°C | 14.5°C | 20.4°C | 11.8°C | 61 mm | 84% | 4.5 m/s | 3.8 |
| 2017 | 16.7°C | 15.3°C | 14.0°C | 19.8°C | 12.7°C | 106 mm | 85% | 4.8 m/s | 4.2 |
| 2016 | 17.5°C | 16.0°C | 14.4°C | 19.9°C | 12.8°C | 81 mm | 86% | 5 m/s | 4.1 |
| 2015 | 16.8°C | 15.2°C | 13.6°C | 19.6°C | 12.0°C | 88 mm | 84% | 4.5 m/s | 4.1 |
| 2014 | 16.2°C | 14.8°C | 13.4°C | 19.3°C | 11.0°C | 111 mm | 82% | 5.7 m/s | 4.2 |
| 2013 | 17.5°C | 16.0°C | 14.4°C | 21.2°C | 12.6°C | 69 mm | 85% | 4.5 m/s | 4.2 |
| 2012 | 17.2°C | 15.7°C | 14.2°C | 19.5°C | 11.9°C | 122 mm | 87% | 4.3 m/s | 3.8 |
| 2011 | 16.2°C | 14.9°C | 13.6°C | 18.2°C | 12.1°C | 71 mm | 83% | 4.3 m/s | 3.7 |
| 2010 | 16.3°C | 14.9°C | 13.5°C | 19.9°C | 11.4°C | 64 mm | 84% | 4.9 m/s | 4.2 |
| 2009 | 17.4°C | 15.8°C | 14.3°C | 19.6°C | 13.1°C | 85 mm | 85% | 5.4 m/s | 4 |
| 2008 | 17.0°C | 15.7°C | 14.4°C | 19.4°C | 12.8°C | 130 mm | 87% | 5 m/s | 3.4 |
| 2007 | 16.6°C | 15.2°C | 13.8°C | 19.5°C | 12.0°C | 69 mm | 85% | 4.8 m/s | 4.2 |
| 2006 | 16.5°C | 15.4°C | 14.2°C | 19.6°C | 12.8°C | 89 mm | 86% | 5.1 m/s | 3.9 |
| 2005 | 16.8°C | 15.4°C | 13.9°C | 20.5°C | 12.4°C | 63 mm | 86% | 4.5 m/s | 4.5 |
| 2004 🌧️ | 17.8°C | 16.3°C | 14.7°C | 20.9°C | 12.5°C | 182 mm | 87% | 4 m/s | 4 |
| 2003 | 18.0°C | 16.4°C | 14.8°C | 23.3°C | 12.2°C | 23 mm | 84% | 3.5 m/s | 4.3 |
| 2002 | 16.8°C | 15.5°C | 14.2°C | 19.7°C | 12.9°C | 93 mm | 88% | 3.7 m/s | 3.8 |
| 2001 | 17.0°C | 15.6°C | 14.2°C | 19.3°C | 12.5°C | 82 mm | 85% | 3.8 m/s | 3.9 |
| 2000 | 17.2°C | 15.7°C | 14.2°C | 20.5°C | 12.8°C | 83 mm | 86% | 3.7 m/s | 4.2 |
| 1999 | 17.1°C | 15.5°C | 13.8°C | 22.2°C | 10.9°C | 109 mm | 85% | 4.1 m/s | 3.8 |
| 1998 | 16.7°C | 15.2°C | 13.7°C | 20.9°C | 12.6°C | 58 mm | 86% | 5.1 m/s | 4.2 |
| 1997 | 18.8°C | 16.8°C | 14.9°C | 22.6°C | 13.0°C | 55 mm | 86% | 3.7 m/s | 4.3 |
| 1996 | 16.8°C | 15.2°C | 13.6°C | 20.7°C | 12.2°C | 75 mm | 86% | 4.1 m/s | 4.2 |
| 1995 🔥 | 19.5°C | 17.4°C | 15.3°C | 23.6°C | 12.7°C | 14 mm | 82% | 3.8 m/s | 5 |
| 1994 | 16.1°C | 14.7°C | 13.3°C | 19.7°C | 11.7°C | 93 mm | 84% | 4.7 m/s | 4.2 |
| 1993 | 15.5°C | 14.0°C | 12.6°C | 18.1°C | 11.1°C | 51 mm | 83% | 4.3 m/s | 4.2 |
| 1992 | 15.9°C | 14.6°C | 13.2°C | 17.8°C | 10.7°C | 112 mm | 83% | 5.6 m/s | 4.1 |
| 1991 | 17.4°C | 15.5°C | 13.7°C | 20.0°C | 12.5°C | 33 mm | 86% | 4.1 m/s | 4.1 |
| 1990 | 17.8°C | 16.1°C | 14.5°C | 24.5°C | 12.1°C | 48 mm | 84% | 4.6 m/s | 3.9 |
| 1989 | 16.9°C | 15.4°C | 14.0°C | 19.6°C | 12.4°C | 86 mm | 83% | 5.4 m/s | 4.2 |
| 1988 | 15.9°C | 14.5°C | 13.0°C | 21.2°C | 11.6°C | 78 mm | 84% | 5.4 m/s | 4.2 |
| 1987 | 15.8°C | 14.6°C | 13.4°C | 19.8°C | 11.1°C | 76 mm | 86% | 4.4 m/s | 3.8 |
| 1986 ❄️ | 14.5°C | 13.2°C | 11.8°C | 17.0°C | 10.2°C | 119 mm | 82% | 5.1 m/s | 3.8 |
| 1985 | 15.4°C | 13.9°C | 12.5°C | 17.7°C | 11.0°C | 121 mm | 85% | 6.4 m/s | 3.6 |
| 1984 | 18.4°C | 16.5°C | 14.6°C | 22.4°C | 12.4°C | 52 mm | 83% | 3.2 m/s | 4.5 |
| 1983 | 17.7°C | 15.9°C | 14.2°C | 20.8°C | 11.5°C | 56 mm | 84% | 3.3 m/s | — |
| 1982 | 16.5°C | 15.0°C | 13.5°C | 20.4°C | 11.5°C | 85 mm | 84% | 5.4 m/s | — |
| 1981 | 17.0°C | 15.6°C | 14.2°C | 20.2°C | 12.4°C | 42 mm | 84% | 3.6 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 17.1°C with lows near 14.1°C (mean 15.6°C), based on 45 years of NASA POWER data.
August averages 80 mm of rainfall in Conwy, about average for rainfall. The wettest on record was 182 mm in 2004.
The hottest August reached 24.5°C in 1990. The coldest dipped to 10.2°C in 1986.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 1.1°C. Daytime highs moved from 17°C to 18°C and overnight lows from 13.8°C to 14.9°C over the same span.
August is one of the warmer months of the year in Conwy and about average for rainfall, so plan for around 17.1°C daytime highs and 14.1°C at night.
Not quite — August is the 12th coolest month in Conwy, averaging 15.6°C.
For August in Conwy, pack light layers you can adjust through the day, with typical highs of 17.1°C and lows of 14.1°C. Bring an umbrella or light rain jacket too.
Relative humidity in August averages 85% — quite humid.
Average wind speed in August is 4.6 m/s. The windiest August on record averaged 6.4 m/s (1985).
The wettest August on record was 2004 with 182 mm. On average, August sees 80 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 Conwy 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.
