August is one of the warmer months of the year in Watertown, with average highs near 24.2°C and lows around 14.6°C (mean 19.4°C). It is a relatively wet time of year, averaging 101 mm of rainfall and 78% relative humidity across the period.
August is one of the warmer months of the year in Watertown. Across 45 years of records, the warmest August in Watertown was 2016 — when the month averaged 22.1°C — while the coldest was 1982 at 16.5°C. Typical August days reach 24.2°C with nights near 14.6°C. The long-term trend is warming, about 0.5°C per decade.
August is a relatively wet time of year in Watertown, averaging 101 mm of rainfall. The wettest August on record was 2024 with 177 mm, while the driest was 2007 at 38 mm.
Relative humidity in Watertown during August averages 78%. The most humid August was 2000 at 83%, and the least humid was 2025 at 71%.
August receives about 5.1 kWh/m²/day of solar energy in Watertown. The sunniest August was 1996 at 5.6 kWh/m²/day, and the cloudiest were 1988, 2004 and 2024 at 4.6.
Average wind speed in Watertown during August is 0.3 m/s. The windiest Augusts were 2023, 2024 and 2025, among others at 0.3 m/s, while the calmest were 2023, 2024 and 2025, 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 | 18.4°C | 18.9°C | 19.6°C | 20.0°C | 20.3°C | +1.9°C |
| Avg High | 23.4°C | 23.7°C | 24.4°C | 24.7°C | 25.1°C | +1.7°C |
| Avg Low | 13.5°C | 14.0°C | 14.9°C | 15.3°C | 15.5°C | +2°C |
| Avg Rain | 111 mm | 87 mm | 95 mm | 96 mm | 126 mm | +15 mm |
August temperatures in Watertown have risen by about 1.8°C between 1981–1985 and 2021–2025.
August has ranged from a record low of 3.7°C (1982) to a record high of 32.9°C (1988).
Rainfall in August is a relatively wet time of year, averaging 101 mm, with a wettest year of 177 mm.
One of the best times to visit Watertown
August is one of the best times to visit Watertown. Expect days averaging 24.2°C and nights around 14.6°C (mean 19.4°C) — warmer than Watertown's yearly average — with higher rainfall (101 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 | 25.4°C | 19.8°C | 14.3°C | 31.7°C | 8.8°C | 54 mm | 71% | 0.3 m/s | 5.3 |
| 2024 🌧️ | 23.9°C | 19.5°C | 15.1°C | 29.5°C | 9.9°C | 177 mm | 83% | 0.3 m/s | 4.6 |
| 2023 | 23.5°C | 18.9°C | 14.3°C | 26.9°C | 8.3°C | 158 mm | 80% | 0.3 m/s | 4.8 |
| 2022 | 26.1°C | 21.3°C | 16.5°C | 30.7°C | 11.6°C | 115 mm | 76% | 0.3 m/s | 5.1 |
| 2021 | 26.6°C | 22.0°C | 17.3°C | 31.0°C | 11.4°C | 134 mm | 80% | 0.3 m/s | 5.1 |
| 2020 | 25.3°C | 20.5°C | 15.6°C | 30.1°C | 10.4°C | 116 mm | 76% | 0.3 m/s | 5.4 |
| 2019 | 24.3°C | 19.5°C | 14.7°C | 27.7°C | 9.9°C | 87 mm | 78% | 0.3 m/s | 5.5 |
| 2018 | 26.3°C | 21.7°C | 17.1°C | 30.4°C | 11.2°C | 89 mm | 80% | 0.3 m/s | 5 |
| 2017 | 23.5°C | 18.9°C | 14.3°C | 27.6°C | 8.6°C | 93 mm | 78% | 0.3 m/s | 5.3 |
| 2016 🔥 | 27.1°C | 22.1°C | 17.1°C | 31.7°C | 11.2°C | 109 mm | 74% | 0.3 m/s | 5.3 |
| 2015 | 24.6°C | 19.8°C | 14.9°C | 29.9°C | 11.8°C | 62 mm | 76% | 0.3 m/s | 5.1 |
| 2014 | 23.2°C | 18.7°C | 14.1°C | 28.9°C | 9.7°C | 114 mm | 80% | 0.3 m/s | 5 |
| 2013 | 23.7°C | 18.9°C | 14.2°C | 27.8°C | 8.8°C | 79 mm | 78% | 0.3 m/s | 5.1 |
| 2012 | 25.8°C | 20.7°C | 15.6°C | 30.7°C | 9.7°C | 62 mm | 72% | 0.3 m/s | 5.3 |
| 2011 | 24.0°C | 19.6°C | 15.2°C | 27.3°C | 10.2°C | 143 mm | 81% | 0.3 m/s | 5 |
| 2010 | 24.8°C | 20.1°C | 15.3°C | 30.6°C | 9.5°C | 126 mm | 78% | 0.3 m/s | 5.1 |
| 2009 | 24.0°C | 19.6°C | 15.1°C | 29.3°C | 8.2°C | 103 mm | 82% | 0.3 m/s | 5 |
| 2008 | 22.8°C | 18.4°C | 14.0°C | 27.8°C | 8.1°C | 128 mm | 82% | 0.3 m/s | 5.1 |
| 2007 | 24.9°C | 19.7°C | 14.5°C | 29.4°C | 9.1°C | 38 mm | 76% | 0.3 m/s | 5.4 |
| 2006 | 23.8°C | 19.1°C | 14.5°C | 30.7°C | 7.6°C | 55 mm | 78% | 0.3 m/s | 5.4 |
| 2005 | 25.6°C | 20.9°C | 16.2°C | 29.5°C | 9.8°C | 131 mm | 77% | 0.3 m/s | 5.2 |
| 2004 | 23.0°C | 18.4°C | 13.9°C | 26.9°C | 8.4°C | 132 mm | 83% | 0.3 m/s | 4.6 |
| 2003 | 24.9°C | 20.2°C | 15.6°C | 28.5°C | 8.8°C | 111 mm | 81% | 0.3 m/s | 5 |
| 2002 | 25.8°C | 20.5°C | 15.1°C | 31.5°C | 9.6°C | 40 mm | 72% | 0.3 m/s | 5.5 |
| 2001 | 26.4°C | 21.2°C | 16.0°C | 30.8°C | 10.1°C | 100 mm | 72% | 0.3 m/s | 5.4 |
| 2000 | 22.7°C | 18.4°C | 14.0°C | 27.3°C | 7.7°C | 109 mm | 83% | 0.3 m/s | 4.9 |
| 1999 | 24.2°C | 19.1°C | 14.0°C | 28.8°C | 8.2°C | 44 mm | 72% | 0.3 m/s | 4.7 |
| 1998 | 24.2°C | 19.7°C | 15.3°C | 27.9°C | 8.5°C | 133 mm | 80% | 0.3 m/s | 5.1 |
| 1997 | 22.7°C | 17.8°C | 13.0°C | 27.6°C | 8.4°C | 91 mm | 79% | 0.3 m/s | 5 |
| 1996 | 23.6°C | 18.8°C | 14.1°C | 28.6°C | 8.9°C | 59 mm | 81% | 0.3 m/s | 5.6 |
| 1995 | 26.0°C | 20.2°C | 14.4°C | 30.9°C | 8.4°C | 68 mm | 72% | 0.3 m/s | 5.3 |
| 1994 | 22.6°C | 17.7°C | 12.8°C | 27.1°C | 6.9°C | 117 mm | 80% | 0.3 m/s | 5.1 |
| 1993 | 24.2°C | 19.5°C | 14.7°C | 29.2°C | 8.5°C | 69 mm | 80% | 0.3 m/s | 5.4 |
| 1992 | 21.7°C | 17.3°C | 12.9°C | 26.8°C | 8.5°C | 109 mm | 82% | 0.3 m/s | 4.9 |
| 1991 | 24.3°C | 19.5°C | 14.6°C | 28.9°C | 10.3°C | 103 mm | 79% | 0.3 m/s | 5 |
| 1990 | 23.9°C | 19.1°C | 14.3°C | 27.5°C | 8.9°C | 72 mm | 82% | 0.3 m/s | 5.3 |
| 1989 | 22.9°C | 18.1°C | 13.2°C | 26.8°C | 5.9°C | 106 mm | 78% | 0.3 m/s | 5 |
| 1988 | 25.1°C | 20.1°C | 15.1°C | 32.9°C | 7.6°C | 124 mm | 75% | 0.3 m/s | 4.6 |
| 1987 | 23.4°C | 18.2°C | 13.0°C | 30.2°C | 7.3°C | 79 mm | 73% | 0.3 m/s | 5.1 |
| 1986 | 21.8°C | 17.2°C | 12.7°C | 26.4°C | 4.7°C | 124 mm | 81% | 0.3 m/s | 4.8 |
| 1985 | 23.3°C | 18.2°C | 13.1°C | 28.1°C | 7.9°C | 73 mm | 75% | 0.3 m/s | 4.8 |
| 1984 | 24.5°C | 19.8°C | 15.1°C | 31.9°C | 6.9°C | 127 mm | 81% | 0.3 m/s | 5.3 |
| 1983 | 24.2°C | 19.2°C | 14.1°C | 30.1°C | 7.5°C | 128 mm | 78% | 0.3 m/s | — |
| 1982 ❄️ | 21.5°C | 16.5°C | 11.4°C | 26.2°C | 3.7°C | 101 mm | 78% | 0.3 m/s | — |
| 1981 | 23.5°C | 18.6°C | 13.7°C | 29.0°C | 8.4°C | 132 mm | 80% | 0.3 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 24.2°C with lows near 14.6°C (mean 19.4°C), based on 45 years of NASA POWER data.
August averages 101 mm of rainfall in Watertown, a relatively wet time of year. The wettest on record was 177 mm in 2024.
The hottest August reached 32.9°C in 1988. The coldest dipped to 3.7°C in 1982.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 1.8°C. Daytime highs moved from 23.4°C to 25.1°C and overnight lows from 13.5°C to 15.5°C over the same span.
August is one of the warmer months of the year in Watertown and a relatively wet time of year, so plan for around 24.2°C daytime highs and 14.6°C at night.
Not quite — August is the 11th coolest month in Watertown, averaging 19.4°C.
For August in Watertown, pack light layers you can adjust through the day, with typical highs of 24.2°C and lows of 14.6°C. Bring an umbrella or light rain jacket too.
Relative humidity in August averages 78% — quite humid.
Average wind speed in August is 0.3 m/s. The windiest August on record averaged 0.3 m/s (1981).
The wettest August on record was 2024 with 177 mm. On average, August sees 101 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 Watertown 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.
