August is one of the warmer months of the year in Hanwell, with average highs near 22.8°C and lows around 12.1°C (mean 17.5°C). It is about average for rainfall, averaging 58 mm of rainfall and 75% relative humidity across the period.
August is one of the warmer months of the year in Hanwell. Across 45 years of records, the warmest August in Hanwell was 2022 — when the month averaged 20.7°C — while the coldest was 1986 at 14.7°C. Typical August days reach 22.8°C with nights near 12.1°C. The long-term trend is warming, about 0.2°C per decade.
August is about average for rainfall in Hanwell, averaging 58 mm of rainfall. The wettest Augusts on record were 2004 and 2015 with 125 mm, while the driest was 1995 at 5 mm.
Relative humidity in Hanwell during August averages 75%. The most humid Augusts were 1999 and 2012 at 80%, and the least humid was 2022 at 64%.
August receives about 4.3 kWh/m²/day of solar energy in Hanwell. 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 Hanwell during August is 3 m/s. The windiest August was 1985 at 4.1 m/s, while the calmest was 1981 at 2.1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 16.7°C | 17.7°C | 17.6°C | 17.1°C | 18.6°C | +1.9°C |
| Avg High | 22.0°C | 23.3°C | 22.7°C | 22.3°C | 24.2°C | +2.2°C |
| Avg Low | 11.4°C | 12.2°C | 12.5°C | 11.9°C | 13.0°C | +1.6°C |
| Avg Rain | 47 mm | 58 mm | 59 mm | 71 mm | 49 mm | +2 mm |
August temperatures in Hanwell have risen by about 1.4°C between 1981–1985 and 2021–2025.
August has ranged from a record low of 5.4°C (1986) to a record high of 35.4°C (1990).
Rainfall in August is about average for rainfall, averaging 58 mm, with a wettest year of 125 mm.
One of the best times to visit Hanwell
August is one of the best times to visit Hanwell. Expect days averaging 22.8°C and nights around 12.1°C (mean 17.5°C) — warmer than Hanwell's yearly average — with moderate rainfall (58 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 | 25.1°C | 18.9°C | 12.7°C | 32.8°C | 9.6°C | 21 mm | 67% | 3 m/s | 4.6 |
| 2024 | 24.0°C | 18.4°C | 12.7°C | 31.6°C | 9.3°C | 56 mm | 74% | 3.2 m/s | 4.3 |
| 2023 | 22.5°C | 17.3°C | 12.0°C | 26.7°C | 9.1°C | 67 mm | 78% | 3 m/s | 4.3 |
| 2022 🔥 | 27.2°C | 20.7°C | 14.2°C | 34.3°C | 9.6°C | 30 mm | 64% | 2.7 m/s | 4.9 |
| 2021 | 21.6°C | 16.8°C | 11.9°C | 23.8°C | 8.8°C | 42 mm | 79% | 3.2 m/s | 3.8 |
| 2020 | 24.6°C | 19.4°C | 14.2°C | 34.3°C | 8.7°C | 79 mm | 72% | 3.4 m/s | 4.1 |
| 2019 | 23.5°C | 18.1°C | 12.8°C | 31.4°C | 9.3°C | 49 mm | 74% | 3.3 m/s | 4.6 |
| 2018 | 24.0°C | 18.3°C | 12.6°C | 32.2°C | 7.5°C | 71 mm | 72% | 2.8 m/s | 4.2 |
| 2017 | 21.2°C | 16.3°C | 11.5°C | 25.5°C | 7.4°C | 80 mm | 78% | 2.9 m/s | 4.2 |
| 2016 | 23.5°C | 18.0°C | 12.6°C | 30.4°C | 8.6°C | 38 mm | 75% | 3.2 m/s | 4.7 |
| 2015 | 21.7°C | 16.7°C | 11.6°C | 28.5°C | 8.2°C | 125 mm | 78% | 3 m/s | 3.7 |
| 2014 | 20.7°C | 15.7°C | 10.6°C | 25.5°C | 5.4°C | 80 mm | 75% | 3.2 m/s | 4.1 |
| 2013 | 23.1°C | 17.6°C | 12.2°C | 30.6°C | 8.8°C | 56 mm | 75% | 2.9 m/s | 4.5 |
| 2012 | 21.8°C | 17.2°C | 12.5°C | 28.8°C | 5.6°C | 52 mm | 80% | 3.1 m/s | 4.1 |
| 2011 | 21.8°C | 16.6°C | 11.4°C | 28.8°C | 7.2°C | 62 mm | 74% | 2.9 m/s | 4 |
| 2010 | 21.2°C | 16.3°C | 11.5°C | 25.4°C | 6.8°C | 100 mm | 76% | 3.4 m/s | 3.8 |
| 2009 | 23.0°C | 17.9°C | 12.7°C | 27.7°C | 8.9°C | 37 mm | 76% | 3.2 m/s | 4.1 |
| 2008 | 21.8°C | 17.2°C | 12.6°C | 25.9°C | 7.7°C | 78 mm | 79% | 3.7 m/s | 3.6 |
| 2007 | 21.3°C | 16.3°C | 11.3°C | 26.8°C | 8.8°C | 41 mm | 78% | 3.2 m/s | 4.5 |
| 2006 | 22.0°C | 17.1°C | 12.3°C | 28.1°C | 9.0°C | 66 mm | 73% | 3.3 m/s | 4.1 |
| 2005 | 22.8°C | 17.1°C | 11.4°C | 30.8°C | 8.4°C | 49 mm | 74% | 2.7 m/s | 4.6 |
| 2004 🌧️ | 22.9°C | 18.2°C | 13.4°C | 29.2°C | 8.4°C | 125 mm | 79% | 2.9 m/s | 4.2 |
| 2003 | 25.7°C | 19.7°C | 13.7°C | 34.9°C | 6.4°C | 18 mm | 71% | 2.4 m/s | 4.7 |
| 2002 | 22.5°C | 17.7°C | 12.9°C | 28.2°C | 10.6°C | 58 mm | 79% | 2.2 m/s | 4 |
| 2001 | 22.6°C | 17.6°C | 12.5°C | 29.4°C | 8.6°C | 76 mm | 79% | 2.8 m/s | 4.1 |
| 2000 | 22.1°C | 17.1°C | 12.2°C | 26.3°C | 9.1°C | 44 mm | 78% | 2.7 m/s | 4.4 |
| 1999 | 21.6°C | 16.8°C | 12.0°C | 29.6°C | 7.3°C | 123 mm | 80% | 2.5 m/s | 4.1 |
| 1998 | 22.4°C | 16.6°C | 10.8°C | 28.6°C | 6.8°C | 29 mm | 75% | 2.8 m/s | 4.9 |
| 1997 | 25.0°C | 19.8°C | 14.6°C | 29.9°C | 10.3°C | 111 mm | 77% | 2.7 m/s | 4.1 |
| 1996 | 22.4°C | 17.1°C | 11.7°C | 29.5°C | 7.8°C | 78 mm | 74% | 3 m/s | 4.4 |
| 1995 | 26.5°C | 19.9°C | 13.3°C | 32.4°C | 8.7°C | 5 mm | 66% | 3.1 m/s | 5.2 |
| 1994 | 21.9°C | 16.8°C | 11.7°C | 27.4°C | 7.5°C | 52 mm | 75% | 3.1 m/s | 4.3 |
| 1993 | 21.0°C | 15.6°C | 10.1°C | 26.3°C | 5.6°C | 39 mm | 74% | 3 m/s | 4.5 |
| 1992 | 21.2°C | 16.4°C | 11.6°C | 28.1°C | 7.8°C | 88 mm | 77% | 3.8 m/s | 4 |
| 1991 | 24.5°C | 18.5°C | 12.5°C | 28.1°C | 8.7°C | 23 mm | 72% | 2.8 m/s | 4.7 |
| 1990 | 26.1°C | 19.8°C | 13.4°C | 35.4°C | 9.5°C | 34 mm | 66% | 2.9 m/s | 4.6 |
| 1989 | 24.1°C | 17.9°C | 11.7°C | 28.7°C | 7.7°C | 39 mm | 68% | 3.3 m/s | 4.8 |
| 1988 | 21.3°C | 15.9°C | 10.6°C | 27.4°C | 7.1°C | 30 mm | 76% | 3.2 m/s | 4.2 |
| 1987 | 21.6°C | 16.5°C | 11.4°C | 28.6°C | 7.5°C | 49 mm | 77% | 2.6 m/s | 3.8 |
| 1986 ❄️ | 19.6°C | 14.7°C | 9.9°C | 23.2°C | 5.4°C | 94 mm | 75% | 3.2 m/s | 3.6 |
| 1985 | 19.6°C | 15.0°C | 10.4°C | 24.5°C | 7.6°C | 69 mm | 79% | 4.1 m/s | 3.9 |
| 1984 | 24.0°C | 18.3°C | 12.7°C | 28.4°C | 8.3°C | 39 mm | 73% | 2.6 m/s | 4.6 |
| 1983 | 23.0°C | 17.5°C | 12.0°C | 28.2°C | 6.9°C | 21 mm | 76% | 2.8 m/s | — |
| 1982 | 21.4°C | 16.5°C | 11.6°C | 25.9°C | 7.1°C | 46 mm | 76% | 3.2 m/s | — |
| 1981 | 23.1°C | 17.6°C | 12.1°C | 28.1°C | 8.3°C | 36 mm | 75% | 2.1 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 22.8°C with lows near 12.1°C (mean 17.5°C), based on 45 years of NASA POWER data.
August averages 58 mm of rainfall in Hanwell, about average for rainfall. The wettest on record was 125 mm in 2004.
The hottest August reached 35.4°C in 1990. The coldest dipped to 5.4°C in 1986.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 1.4°C. Daytime highs moved from 22.2°C to 24.1°C and overnight lows from 11.8°C to 12.7°C over the same span.
August is one of the warmer months of the year in Hanwell and about average for rainfall, so plan for around 22.8°C daytime highs and 12.1°C at night.
Not quite — August is the 11th coolest month in Hanwell, averaging 17.5°C.
For August in Hanwell, pack light layers you can adjust through the day, with typical highs of 22.8°C and lows of 12.1°C. Bring an umbrella or light rain jacket too.
Relative humidity in August averages 75% — moderately humid.
Average wind speed in August is 3 m/s. The windiest August on record averaged 4.1 m/s (1985).
The wettest August on record was 2004 with 125 mm. On average, August sees 58 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 Hanwell 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.
