July is one of the warmer months of the year in Watertown, with average highs near 24.5°C and lows around 15.1°C (mean 19.8°C). It is about average for rainfall, averaging 98 mm of rainfall and 79% relative humidity across the period.
July is one of the warmer months of the year in Watertown. Across 45 years of records, the warmest July in Watertown was 2020 — when the month averaged 22.9°C — while the coldest was 1992 at 16.9°C. Typical July days reach 24.5°C with nights near 15.1°C. The long-term trend is warming, about 0.5°C per decade.
July is about average for rainfall in Watertown, averaging 98 mm of rainfall. The wettest July on record was 2021 with 189 mm, while the driest was 2002 at 41 mm.
Relative humidity in Watertown during July averages 79%. The most humid July was 2004 at 84%, and the least humid was 2016 at 72%.
July receives about 5.8 kWh/m²/day of solar energy in Watertown. The sunniest July was 2018 at 6.8 kWh/m²/day, and the cloudiest was 1984 at 4.9.
Average wind speed in Watertown during July is 0.3 m/s. The windiest Julys were 2023, 2024 and 2025, among others at 0.3 m/s, while the calmest were 1988, 1994 and 2004, among others at 0.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 19.2°C | 19.2°C | 19.4°C | 20.6°C | 21.2°C | +2°C |
| Avg High | 24.1°C | 23.9°C | 23.9°C | 25.4°C | 26.0°C | +1.9°C |
| Avg Low | 14.4°C | 14.5°C | 14.8°C | 15.9°C | 16.4°C | +2°C |
| Avg Rain | 82 mm | 98 mm | 110 mm | 85 mm | 119 mm | +37 mm |
July temperatures in Watertown have risen by about 2°C between 1981–1985 and 2021–2025.
July has ranged from a record low of 6.8°C (2001) to a record high of 36.7°C (2005).
Rainfall in July is about average for rainfall, averaging 98 mm, with a wettest year of 189 mm.
One of the best times to visit Watertown
July is one of the best times to visit Watertown. Expect days averaging 24.5°C and nights around 15.1°C (mean 19.8°C) — warmer than Watertown's yearly average — with higher rainfall (98 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 | 26.4°C | 21.6°C | 16.7°C | 30.7°C | 10.2°C | 71 mm | 78% | 0.3 m/s | 6 |
| 2024 | 26.2°C | 21.3°C | 16.5°C | 29.9°C | 11.4°C | 158 mm | 80% | 0.3 m/s | 5.8 |
| 2023 | 25.8°C | 21.0°C | 16.2°C | 30.6°C | 10.0°C | 126 mm | 80% | 0.3 m/s | 5.5 |
| 2022 | 25.6°C | 20.6°C | 15.5°C | 30.1°C | 10.6°C | 86 mm | 73% | 0.3 m/s | 6.4 |
| 2021 🌧️ | 24.1°C | 19.5°C | 15.0°C | 27.8°C | 8.9°C | 189 mm | 80% | 0.3 m/s | 5 |
| 2020 🔥 | 27.6°C | 22.9°C | 18.3°C | 31.8°C | 15.1°C | 86 mm | 77% | 0.3 m/s | 6.3 |
| 2019 | 26.0°C | 21.6°C | 17.1°C | 31.0°C | 11.9°C | 80 mm | 82% | 0.3 m/s | 6.2 |
| 2018 | 26.4°C | 21.6°C | 16.8°C | 30.9°C | 10.4°C | 90 mm | 76% | 0.3 m/s | 6.8 |
| 2017 | 24.2°C | 19.9°C | 15.6°C | 28.2°C | 10.5°C | 114 mm | 82% | 0.3 m/s | 5.6 |
| 2016 | 26.4°C | 21.3°C | 16.2°C | 29.7°C | 12.6°C | 58 mm | 72% | 0.3 m/s | 6.2 |
| 2015 | 24.5°C | 19.6°C | 14.6°C | 29.8°C | 9.1°C | 65 mm | 77% | 0.3 m/s | 6.2 |
| 2014 | 23.0°C | 18.6°C | 14.2°C | 28.9°C | 9.9°C | 130 mm | 81% | 0.3 m/s | 5.5 |
| 2013 | 25.5°C | 21.0°C | 16.5°C | 29.7°C | 8.8°C | 104 mm | 82% | 0.3 m/s | 5.8 |
| 2012 | 26.2°C | 21.1°C | 16.0°C | 30.3°C | 12.5°C | 61 mm | 73% | 0.3 m/s | 6.5 |
| 2011 | 25.6°C | 20.7°C | 15.9°C | 29.9°C | 10.8°C | 47 mm | 79% | 0.3 m/s | 6.3 |
| 2010 | 25.7°C | 20.9°C | 16.2°C | 31.1°C | 9.0°C | 104 mm | 79% | 0.3 m/s | 6.1 |
| 2009 | 22.1°C | 17.9°C | 13.8°C | 26.8°C | 9.4°C | 126 mm | 83% | 0.3 m/s | 5.1 |
| 2008 | 24.4°C | 19.9°C | 15.5°C | 31.7°C | 11.5°C | 128 mm | 82% | 0.3 m/s | 5.5 |
| 2007 | 23.3°C | 18.8°C | 14.2°C | 28.6°C | 7.8°C | 118 mm | 82% | 0.3 m/s | 5.5 |
| 2006 | 25.2°C | 20.9°C | 16.6°C | 28.4°C | 12.7°C | 123 mm | 83% | 0.3 m/s | 5.9 |
| 2005 | 26.3°C | 21.4°C | 16.5°C | 36.7°C | 11.2°C | 156 mm | 80% | 0.3 m/s | 6.1 |
| 2004 | 24.0°C | 19.5°C | 15.1°C | 27.7°C | 11.7°C | 143 mm | 84% | 0.2 m/s | 5 |
| 2003 | 23.9°C | 19.4°C | 14.8°C | 26.9°C | 10.2°C | 100 mm | 80% | 0.3 m/s | 5.7 |
| 2002 | 24.6°C | 19.8°C | 15.0°C | 29.8°C | 9.8°C | 41 mm | 78% | 0.3 m/s | 6.2 |
| 2001 | 23.2°C | 18.1°C | 13.0°C | 29.8°C | 6.8°C | 46 mm | 74% | 0.3 m/s | 6.1 |
| 2000 | 22.1°C | 17.8°C | 13.4°C | 26.7°C | 8.8°C | 124 mm | 82% | 0.3 m/s | 5.5 |
| 1999 | 26.0°C | 21.0°C | 16.1°C | 30.3°C | 10.3°C | 103 mm | 75% | 0.3 m/s | 6.2 |
| 1998 | 23.5°C | 19.2°C | 14.9°C | 28.0°C | 11.9°C | 100 mm | 81% | 0.3 m/s | 5.9 |
| 1997 | 23.0°C | 18.3°C | 13.5°C | 28.7°C | 9.3°C | 80 mm | 79% | 0.3 m/s | 6.1 |
| 1996 | 22.6°C | 18.0°C | 13.4°C | 27.0°C | 9.6°C | 137 mm | 82% | 0.3 m/s | 5.6 |
| 1995 | 25.6°C | 20.6°C | 15.5°C | 29.6°C | 8.8°C | 121 mm | 78% | 0.3 m/s | 5.4 |
| 1994 | 25.0°C | 20.4°C | 15.7°C | 30.8°C | 10.9°C | 58 mm | 82% | 0.2 m/s | 5.8 |
| 1993 | 24.2°C | 19.6°C | 15.0°C | 29.5°C | 9.3°C | 56 mm | 81% | 0.3 m/s | 5.9 |
| 1992 ❄️ | 21.3°C | 16.9°C | 12.6°C | 25.1°C | 8.9°C | 170 mm | 83% | 0.3 m/s | 5.4 |
| 1991 | 24.1°C | 19.2°C | 14.3°C | 28.5°C | 9.0°C | 78 mm | 79% | 0.3 m/s | 6.2 |
| 1990 | 23.8°C | 19.1°C | 14.3°C | 29.2°C | 9.4°C | 79 mm | 80% | 0.3 m/s | 5.8 |
| 1989 | 24.3°C | 19.2°C | 14.2°C | 28.6°C | 10.1°C | 65 mm | 79% | 0.3 m/s | 6.4 |
| 1988 | 26.2°C | 20.8°C | 15.3°C | 31.5°C | 8.3°C | 83 mm | 76% | 0.2 m/s | 5.6 |
| 1987 | 25.0°C | 20.4°C | 15.8°C | 29.4°C | 10.5°C | 85 mm | 79% | 0.3 m/s | 6 |
| 1986 | 23.5°C | 18.8°C | 14.1°C | 29.7°C | 8.8°C | 133 mm | 81% | 0.2 m/s | 5.5 |
| 1985 | 23.0°C | 18.0°C | 13.1°C | 27.7°C | 8.8°C | 70 mm | 78% | 0.3 m/s | 6.1 |
| 1984 | 23.2°C | 18.5°C | 13.8°C | 26.8°C | 8.1°C | 71 mm | 79% | 0.3 m/s | 4.9 |
| 1983 | 24.6°C | 19.6°C | 14.5°C | 28.7°C | 8.8°C | 70 mm | 78% | 0.3 m/s | — |
| 1982 | 23.8°C | 18.7°C | 13.6°C | 28.9°C | 7.8°C | 57 mm | 78% | 0.3 m/s | — |
| 1981 | 23.7°C | 19.2°C | 14.8°C | 28.0°C | 8.5°C | 104 mm | 80% | 0.3 m/s | — |
Actual recorded July data for each year, 1981–2025 — sourced from NASA POWER.
The average high in July is around 24.5°C with lows near 15.1°C (mean 19.8°C), based on 45 years of NASA POWER data.
July averages 98 mm of rainfall in Watertown, about average for rainfall. The wettest on record was 189 mm in 2021.
The hottest July reached 36.7°C in 2005. The coldest dipped to 6.8°C in 2001.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average July temperatures have risen by about 2°C. Daytime highs moved from 23.7°C to 25.6°C and overnight lows from 14°C to 16°C over the same span.
July is one of the warmer months of the year in Watertown and about average for rainfall, so plan for around 24.5°C daytime highs and 15.1°C at night.
Not quite — July is the 12th coolest month in Watertown, averaging 19.8°C.
For July in Watertown, pack light layers you can adjust through the day, with typical highs of 24.5°C and lows of 15.1°C. Bring an umbrella or light rain jacket too.
Relative humidity in July averages 79% — quite humid.
Average wind speed in July is 0.3 m/s. The windiest July on record averaged 0.3 m/s (1981).
The wettest July on record was 2021 with 189 mm. On average, July sees 98 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 July, 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 July specifically, along with year-by-year records and how the month has changed over the decades.
