August is one of the warmer months of the year in Derry, with average highs near 16.6°C and lows around 11.3°C (mean 14°C). It is about average for rainfall, averaging 113 mm of rainfall and 87% relative humidity across the period.
August is one of the warmer months of the year in Derry. Across 45 years of records, the warmest August in Derry was 1995 — when the month averaged 16.4°C — while the coldest was 1986 at 11.4°C. Typical August days reach 16.6°C with nights near 11.3°C. The long-term trend is warming, about 0.2°C per decade.
August is about average for rainfall in Derry, averaging 113 mm of rainfall. The wettest August on record was 1985 with 221 mm, while the driest was 1995 at 26 mm.
Relative humidity in Derry during August averages 87%. The most humid August was 2008 at 89%, and the least humid was 1982 at 85%.
August receives about 3.6 kWh/m²/day of solar energy in Derry. The sunniest August was 1995 at 4.6 kWh/m²/day, and the cloudiest was 2008 at 3.
Average wind speed in Derry during August is 3.9 m/s. The windiest August was 2024 at 5.1 m/s, while the calmest was 1983 at 2.9 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 13.6°C | 14.0°C | 14.2°C | 13.6°C | 14.7°C | +1.1°C |
| Avg High | 16.3°C | 16.7°C | 16.8°C | 16.2°C | 17.5°C | +1.2°C |
| Avg Low | 10.8°C | 11.3°C | 11.6°C | 11.1°C | 12.0°C | +1.2°C |
| Avg Rain | 122 mm | 100 mm | 117 mm | 121 mm | 106 mm | -16 mm |
August temperatures in Derry have risen by about 0.8°C between 1981–1985 and 2021–2025.
August has ranged from a record low of 6.4°C (1982) to a record high of 24.3°C (2003).
Rainfall in August is about average for rainfall, averaging 113 mm, with a wettest year of 221 mm.
One of the best times to visit Derry
August is one of the best times to visit Derry. Expect days averaging 16.6°C and nights around 11.3°C (mean 14°C) — warmer than Derry's yearly average — with higher rainfall (113 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 | 18.6°C | 15.7°C | 12.9°C | 23.9°C | 10.6°C | 82 mm | 86% | 4 m/s | 3.8 |
| 2024 | 16.5°C | 13.8°C | 11.2°C | 19.6°C | 8.7°C | 140 mm | 86% | 5.1 m/s | 3.5 |
| 2023 | 17.1°C | 14.7°C | 12.3°C | 21.9°C | 10.1°C | 109 mm | 88% | 4.4 m/s | 3.8 |
| 2022 | 17.9°C | 14.9°C | 11.9°C | 23.7°C | 9.1°C | 49 mm | 85% | 3.4 m/s | 4.5 |
| 2021 | 17.6°C | 14.9°C | 12.2°C | 21.4°C | 10.6°C | 106 mm | 88% | 3 m/s | 3.5 |
| 2020 | 17.2°C | 14.4°C | 11.6°C | 21.8°C | 8.5°C | 148 mm | 88% | 3.5 m/s | 3.5 |
| 2019 | 17.2°C | 14.5°C | 11.7°C | 20.5°C | 8.1°C | 183 mm | 88% | 4.3 m/s | 3.9 |
| 2018 | 16.2°C | 13.6°C | 11.1°C | 19.7°C | 7.5°C | 130 mm | 87% | 4 m/s | 3.4 |
| 2017 | 16.0°C | 13.5°C | 10.9°C | 18.5°C | 8.2°C | 136 mm | 87% | 4.1 m/s | 3.6 |
| 2016 | 17.0°C | 14.4°C | 11.8°C | 20.6°C | 9.3°C | 107 mm | 88% | 4.4 m/s | 3.6 |
| 2015 | 15.7°C | 13.0°C | 10.2°C | 19.0°C | 7.6°C | 137 mm | 87% | 3.9 m/s | 3.6 |
| 2014 | 15.2°C | 12.9°C | 10.6°C | 18.9°C | 7.2°C | 126 mm | 86% | 4.5 m/s | 3.7 |
| 2013 | 16.5°C | 14.1°C | 11.7°C | 20.4°C | 9.2°C | 86 mm | 87% | 4.1 m/s | 3.5 |
| 2012 | 17.1°C | 14.3°C | 11.6°C | 21.0°C | 9.0°C | 117 mm | 88% | 4 m/s | 3.8 |
| 2011 | 15.3°C | 12.8°C | 10.3°C | 18.3°C | 7.7°C | 95 mm | 85% | 3.3 m/s | 3.5 |
| 2010 | 15.6°C | 13.1°C | 10.7°C | 19.1°C | 7.9°C | 90 mm | 86% | 3.9 m/s | 4.1 |
| 2009 | 16.5°C | 14.0°C | 11.4°C | 19.5°C | 9.4°C | 190 mm | 88% | 4.6 m/s | 3.4 |
| 2008 | 16.7°C | 14.4°C | 12.1°C | 20.0°C | 10.5°C | 189 mm | 89% | 3.9 m/s | 3 |
| 2007 | 15.9°C | 13.4°C | 11.0°C | 18.9°C | 9.1°C | 111 mm | 88% | 4 m/s | 3.5 |
| 2006 | 16.1°C | 14.0°C | 11.9°C | 21.9°C | 9.3°C | 91 mm | 88% | 4.1 m/s | 3.4 |
| 2005 | 16.6°C | 14.0°C | 11.3°C | 20.5°C | 8.5°C | 133 mm | 87% | 3.9 m/s | 3.6 |
| 2004 | 17.3°C | 14.7°C | 12.2°C | 21.0°C | 9.6°C | 115 mm | 88% | 3.7 m/s | 3.4 |
| 2003 | 18.0°C | 15.0°C | 12.0°C | 24.3°C | 8.8°C | 39 mm | 86% | 3.2 m/s | 4 |
| 2002 | 17.2°C | 14.3°C | 11.5°C | 21.1°C | 8.8°C | 82 mm | 88% | 3.2 m/s | 3.4 |
| 2001 | 16.4°C | 13.6°C | 10.8°C | 19.6°C | 8.5°C | 107 mm | 88% | 3.4 m/s | 3.5 |
| 2000 | 17.1°C | 14.2°C | 11.3°C | 19.7°C | 9.1°C | 112 mm | 87% | 3.2 m/s | 4 |
| 1999 | 16.7°C | 14.0°C | 11.3°C | 20.9°C | 7.5°C | 109 mm | 87% | 4 m/s | 3.6 |
| 1998 | 16.5°C | 13.9°C | 11.4°C | 20.2°C | 8.1°C | 104 mm | 88% | 4.5 m/s | 3.7 |
| 1997 | 18.5°C | 15.5°C | 12.6°C | 22.3°C | 9.9°C | 84 mm | 86% | 3.7 m/s | 3.9 |
| 1996 | 16.1°C | 13.5°C | 10.8°C | 20.5°C | 7.8°C | 154 mm | 89% | 3.5 m/s | 3.4 |
| 1995 🔥 | 19.8°C | 16.4°C | 13.0°C | 24.2°C | 9.8°C | 26 mm | 85% | 3.4 m/s | 4.6 |
| 1994 | 15.7°C | 13.1°C | 10.5°C | 20.3°C | 8.8°C | 92 mm | 87% | 3.7 m/s | 3.9 |
| 1993 | 14.9°C | 12.3°C | 9.7°C | 20.8°C | 7.4°C | 78 mm | 87% | 3.7 m/s | 3.7 |
| 1992 | 14.9°C | 12.4°C | 10.0°C | 17.7°C | 8.1°C | 169 mm | 85% | 4.7 m/s | 3.8 |
| 1991 | 17.4°C | 14.6°C | 11.8°C | 21.6°C | 9.0°C | 73 mm | 87% | 3.8 m/s | 3.7 |
| 1990 | 16.9°C | 14.4°C | 11.9°C | 21.9°C | 9.4°C | 109 mm | 87% | 4.1 m/s | 3.4 |
| 1989 | 16.4°C | 13.8°C | 11.1°C | 20.2°C | 7.1°C | 146 mm | 86% | 4.9 m/s | 3.3 |
| 1988 | 15.5°C | 12.9°C | 10.4°C | 20.2°C | 7.9°C | 152 mm | 87% | 4.6 m/s | 3.5 |
| 1987 | 16.4°C | 13.8°C | 11.2°C | 20.3°C | 7.9°C | 121 mm | 87% | 3.6 m/s | 3.3 |
| 1986 ❄️ | 13.9°C | 11.4°C | 8.9°C | 17.9°C | 6.6°C | 132 mm | 85% | 3.9 m/s | 3.2 |
| 1985 🌧️ | 14.3°C | 12.2°C | 10.0°C | 17.8°C | 7.7°C | 221 mm | 88% | 5 m/s | 3.4 |
| 1984 | 18.5°C | 15.2°C | 11.9°C | 23.0°C | 8.5°C | 77 mm | 85% | 3.3 m/s | 3.7 |
| 1983 | 18.6°C | 15.2°C | 11.8°C | 22.2°C | 8.0°C | 65 mm | 86% | 2.9 m/s | — |
| 1982 | 15.9°C | 13.3°C | 10.8°C | 20.9°C | 6.4°C | 118 mm | 85% | 4.7 m/s | — |
| 1981 | 17.2°C | 14.2°C | 11.2°C | 21.1°C | 8.1°C | 67 mm | 88% | 3.4 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 16.6°C with lows near 11.3°C (mean 14°C), based on 45 years of NASA POWER data.
August averages 113 mm of rainfall in Derry, about average for rainfall. The wettest on record was 221 mm in 1985.
The hottest August reached 24.3°C in 2003. The coldest dipped to 6.4°C in 1982.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 0.8°C. Daytime highs moved from 16.9°C to 17.5°C and overnight lows from 11.1°C to 12.1°C over the same span.
August is one of the warmer months of the year in Derry and about average for rainfall, so plan for around 16.6°C daytime highs and 11.3°C at night.
Not quite — August is the 11th coolest month in Derry, averaging 14°C.
For August in Derry, pack light layers you can adjust through the day, with typical highs of 16.6°C and lows of 11.3°C. Bring an umbrella or light rain jacket too.
Relative humidity in August averages 87% — quite humid.
Average wind speed in August is 3.9 m/s. The windiest August on record averaged 5.1 m/s (2024).
The wettest August on record was 1985 with 221 mm. On average, August sees 113 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 Derry 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.
