August is one of the warmer months of the year in Dorchester, with average highs near 27.1°C and lows around 16.3°C (mean 21.7°C). It is about average for rainfall, averaging 93 mm of rainfall and 73% relative humidity across the period.
August is one of the warmer months of the year in Dorchester. Across 45 years of records, the warmest August in Dorchester was 2022 — when the month averaged 24.9°C — while the coldest was 1982 at 19°C. Typical August days reach 27.1°C with nights near 16.3°C. The long-term trend is warming, about 0.5°C per decade.
August is about average for rainfall in Dorchester, averaging 93 mm of rainfall. The wettest August on record was 2011 with 211 mm, while the driest was 2007 at 36 mm.
Relative humidity in Dorchester during August averages 73%. The most humid August was 2021 at 82%, and the least humid was 2002 at 61%.
August receives about 5.2 kWh/m²/day of solar energy in Dorchester. The sunniest Augusts were 2002 and 2025 at 5.8 kWh/m²/day, and the cloudiest was 2021 at 4.7.
Average wind speed in Dorchester during August is 0.4 m/s. The windiest Augusts were 2023, 2024 and 2025, among others at 0.4 m/s, while the calmest were 1998, 2001 and 2015, among others at 0.3 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 20.6°C | 21.3°C | 21.9°C | 22.3°C | 22.5°C | +1.9°C |
| Avg High | 26.1°C | 26.9°C | 27.2°C | 27.6°C | 27.8°C | +1.7°C |
| Avg Low | 15.2°C | 15.8°C | 16.6°C | 16.9°C | 17.2°C | +2°C |
| Avg Rain | 89 mm | 100 mm | 85 mm | 102 mm | 86 mm | -3 mm |
August temperatures in Dorchester have risen by about 1.6°C between 1981–1985 and 2021–2025.
August has ranged from a record low of 6.4°C (1982) to a record high of 38°C (2002).
Rainfall in August is about average for rainfall, averaging 93 mm, with a wettest year of 211 mm.
One of the best times to visit Dorchester
August is one of the best times to visit Dorchester. Expect days averaging 27.1°C and nights around 16.3°C (mean 21.7°C) — warmer than Dorchester's yearly average — with higher rainfall (93 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 | 28.2°C | 22.0°C | 15.8°C | 35.4°C | 12.0°C | 43 mm | 63% | 0.4 m/s | 5.8 |
| 2024 | 26.6°C | 21.5°C | 16.4°C | 32.7°C | 11.9°C | 108 mm | 77% | 0.4 m/s | 4.8 |
| 2023 | 24.9°C | 20.5°C | 16.1°C | 27.5°C | 11.9°C | 149 mm | 82% | 0.4 m/s | 4.9 |
| 2022 🔥 | 30.8°C | 24.9°C | 19.0°C | 36.8°C | 15.1°C | 61 mm | 65% | 0.4 m/s | 5.5 |
| 2021 | 27.1°C | 22.6°C | 18.2°C | 32.6°C | 12.1°C | 106 mm | 82% | 0.4 m/s | 4.7 |
| 2020 | 29.3°C | 23.6°C | 17.8°C | 34.9°C | 12.1°C | 52 mm | 65% | 0.4 m/s | 5.2 |
| 2019 | 27.3°C | 22.0°C | 16.6°C | 31.6°C | 10.9°C | 115 mm | 73% | 0.4 m/s | 5.6 |
| 2018 | 28.2°C | 23.5°C | 18.7°C | 34.6°C | 13.6°C | 128 mm | 80% | 0.4 m/s | 5 |
| 2017 | 26.2°C | 21.0°C | 15.7°C | 30.7°C | 11.3°C | 69 mm | 73% | 0.4 m/s | 5.4 |
| 2016 | 30.1°C | 24.1°C | 18.1°C | 35.7°C | 13.2°C | 61 mm | 66% | 0.4 m/s | 5.7 |
| 2015 | 29.2°C | 23.4°C | 17.6°C | 34.3°C | 14.2°C | 66 mm | 70% | 0.3 m/s | 5.5 |
| 2014 | 26.3°C | 20.8°C | 15.4°C | 31.9°C | 11.5°C | 75 mm | 73% | 0.4 m/s | 5.4 |
| 2013 | 26.1°C | 20.8°C | 15.6°C | 31.3°C | 12.0°C | 70 mm | 75% | 0.4 m/s | 5.5 |
| 2012 | 28.4°C | 22.9°C | 17.4°C | 33.5°C | 12.9°C | 110 mm | 72% | 0.4 m/s | 5.6 |
| 2011 🌧️ | 26.4°C | 21.6°C | 16.7°C | 32.2°C | 12.6°C | 211 mm | 79% | 0.4 m/s | 5 |
| 2010 | 27.9°C | 22.4°C | 16.9°C | 33.6°C | 12.3°C | 117 mm | 70% | 0.4 m/s | 5.1 |
| 2009 | 26.5°C | 21.8°C | 17.1°C | 32.0°C | 12.3°C | 95 mm | 82% | 0.4 m/s | 5.3 |
| 2008 | 25.0°C | 20.0°C | 14.9°C | 27.7°C | 10.3°C | 102 mm | 79% | 0.4 m/s | 5.3 |
| 2007 | 28.4°C | 22.2°C | 16.0°C | 35.4°C | 10.2°C | 36 mm | 67% | 0.4 m/s | 5.4 |
| 2006 | 24.9°C | 20.2°C | 15.6°C | 32.2°C | 10.4°C | 93 mm | 81% | 0.4 m/s | 5.2 |
| 2005 | 28.9°C | 23.4°C | 17.9°C | 33.9°C | 13.8°C | 79 mm | 73% | 0.4 m/s | 5.2 |
| 2004 | 26.2°C | 21.2°C | 16.3°C | 32.4°C | 10.3°C | 140 mm | 78% | 0.4 m/s | 5.1 |
| 2003 | 27.2°C | 22.5°C | 17.7°C | 32.6°C | 11.5°C | 117 mm | 79% | 0.4 m/s | 4.8 |
| 2002 | 30.2°C | 23.9°C | 17.6°C | 38.0°C | 10.5°C | 53 mm | 61% | 0.4 m/s | 5.8 |
| 2001 | 29.2°C | 23.5°C | 17.8°C | 36.7°C | 12.4°C | 75 mm | 69% | 0.3 m/s | 5.2 |
| 2000 | 25.1°C | 20.1°C | 15.1°C | 30.7°C | 11.1°C | 64 mm | 79% | 0.4 m/s | 4.9 |
| 1999 | 27.4°C | 21.7°C | 16.0°C | 33.5°C | 11.2°C | 55 mm | 66% | 0.4 m/s | 5 |
| 1998 | 26.6°C | 21.3°C | 16.0°C | 31.0°C | 10.2°C | 82 mm | 77% | 0.3 m/s | 5.2 |
| 1997 | 26.3°C | 20.9°C | 15.4°C | 32.9°C | 12.7°C | 105 mm | 72% | 0.4 m/s | 5.1 |
| 1996 | 27.2°C | 21.5°C | 15.8°C | 31.1°C | 12.5°C | 43 mm | 73% | 0.3 m/s | 5.3 |
| 1995 | 28.5°C | 22.0°C | 15.6°C | 35.1°C | 11.0°C | 44 mm | 63% | 0.4 m/s | 5.5 |
| 1994 | 26.1°C | 20.6°C | 15.2°C | 32.6°C | 10.1°C | 140 mm | 73% | 0.4 m/s | 5.1 |
| 1993 | 28.8°C | 22.5°C | 16.2°C | 35.6°C | 11.1°C | 45 mm | 67% | 0.3 m/s | 5.5 |
| 1992 | 25.0°C | 19.9°C | 14.7°C | 30.2°C | 10.4°C | 123 mm | 76% | 0.4 m/s | 5.1 |
| 1991 | 26.8°C | 21.6°C | 16.4°C | 31.7°C | 11.3°C | 198 mm | 76% | 0.4 m/s | 5.2 |
| 1990 | 25.8°C | 21.2°C | 16.5°C | 31.9°C | 11.0°C | 163 mm | 80% | 0.4 m/s | 5 |
| 1989 | 24.7°C | 20.1°C | 15.4°C | 29.1°C | 8.1°C | 148 mm | 79% | 0.4 m/s | 5.1 |
| 1988 | 27.8°C | 22.3°C | 16.8°C | 34.0°C | 8.2°C | 74 mm | 73% | 0.4 m/s | 5.2 |
| 1987 | 26.3°C | 20.4°C | 14.5°C | 34.8°C | 9.4°C | 82 mm | 67% | 0.4 m/s | 5.3 |
| 1986 | 24.6°C | 19.5°C | 14.4°C | 28.1°C | 6.6°C | 91 mm | 76% | 0.4 m/s | 4.9 |
| 1985 | 25.9°C | 20.4°C | 14.9°C | 32.0°C | 10.8°C | 132 mm | 72% | 0.4 m/s | 5 |
| 1984 | 26.5°C | 21.3°C | 16.2°C | 30.1°C | 10.2°C | 36 mm | 79% | 0.4 m/s | 5.7 |
| 1983 | 27.2°C | 21.5°C | 15.8°C | 32.5°C | 10.7°C | 125 mm | 72% | 0.4 m/s | — |
| 1982 ❄️ | 24.2°C | 19.0°C | 13.7°C | 27.8°C | 6.4°C | 69 mm | 76% | 0.4 m/s | — |
| 1981 | 27.5°C | 21.2°C | 15.0°C | 32.3°C | 9.1°C | 44 mm | 66% | 0.4 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 27.1°C with lows near 16.3°C (mean 21.7°C), based on 45 years of NASA POWER data.
August averages 93 mm of rainfall in Dorchester, about average for rainfall. The wettest on record was 211 mm in 2011.
The hottest August reached 38°C in 2002. 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 1.6°C. Daytime highs moved from 26.3°C to 27.5°C and overnight lows from 15.1°C to 17.1°C over the same span.
August is one of the warmer months of the year in Dorchester and about average for rainfall, so plan for around 27.1°C daytime highs and 16.3°C at night.
Not quite — August is the 11th coolest month in Dorchester, averaging 21.7°C.
For August in Dorchester, pack light layers you can adjust through the day, with typical highs of 27.1°C and lows of 16.3°C. Bring an umbrella or light rain jacket too.
Relative humidity in August averages 73% — moderately humid.
Average wind speed in August is 0.4 m/s. The windiest August on record averaged 0.4 m/s (1981).
The wettest August on record was 2011 with 211 mm. On average, August sees 93 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 Dorchester 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.
