April is one of the cooler months of the year in Watertown, with average highs near 10.6°C and lows around 0.3°C (mean 5.5°C). It is about average for rainfall, averaging 87 mm of rainfall and 80% relative humidity across the period.
April is one of the cooler months of the year in Watertown. Across 45 years of records, the warmest April in Watertown was 2010 — when the month averaged 8.6°C — while the coldest was 2018 at 2.2°C. Typical April days reach 10.6°C with nights near 0.3°C. The long-term trend is warming, about 0.2°C per decade.
April is about average for rainfall in Watertown, averaging 87 mm of rainfall. The wettest April on record was 2011 with 178 mm, while the driest was 1999 at 23 mm.
Relative humidity in Watertown during April averages 80%. The most humid April was 1983 at 86%, and the least humid was 2016 at 73%.
April receives about 4.4 kWh/m²/day of solar energy in Watertown. The sunniest April was 2016 at 5.4 kWh/m²/day, and the cloudiest was 1993 at 3.5.
Average wind speed in Watertown during April is 0.5 m/s. The windiest April was 1982 at 0.7 m/s, while the calmest were 2021, 2022 and 2023, among others at 0.5 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 5.3°C | 5.1°C | 5.8°C | 5.4°C | 6.1°C | +0.8°C |
| Avg High | 10.4°C | 10.1°C | 10.9°C | 10.7°C | 11.3°C | +0.9°C |
| Avg Low | 0.3°C | 0.1°C | 0.6°C | 0.2°C | 0.8°C | +0.5°C |
| Avg Rain | 79 mm | 92 mm | 88 mm | 91 mm | 84 mm | +6 mm |
April temperatures in Watertown have risen by about 1.6°C between 1981–1985 and 2021–2025.
April has ranged from a record low of -14.5°C (1982) to a record high of 28.7°C (2023).
Rainfall in April is about average for rainfall, averaging 87 mm, with a wettest year of 178 mm.
A good time to visit Watertown
April is a good time to visit Watertown, with days averaging 10.6°C and nights around 0.3°C (mean 5.5°C, cooler than Watertown's yearly average) and higher rainfall. July and August are marginally more temperate, but April still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 11.0°C | 5.6°C | 0.2°C | 23.5°C | -7.9°C | 88 mm | 78% | 0.6 m/s | 4.3 |
| 2024 | 11.9°C | 6.8°C | 1.7°C | 20.9°C | -5.4°C | 102 mm | 80% | 0.6 m/s | 4.2 |
| 2023 | 13.5°C | 7.8°C | 2.0°C | 28.7°C | -7.2°C | 97 mm | 78% | 0.5 m/s | 4.5 |
| 2022 | 10.5°C | 5.2°C | -0.2°C | 21.4°C | -5.2°C | 89 mm | 79% | 0.5 m/s | 4.5 |
| 2021 | 12.1°C | 6.8°C | 1.5°C | 23.5°C | -6.7°C | 71 mm | 75% | 0.5 m/s | 4.7 |
| 2020 | 8.9°C | 4.2°C | -0.6°C | 19.3°C | -5.2°C | 59 mm | 77% | 0.6 m/s | 4.4 |
| 2019 | 11.2°C | 5.8°C | 0.5°C | 19.7°C | -5.5°C | 93 mm | 81% | 0.6 m/s | 4 |
| 2018 ❄️ | 6.2°C | 2.2°C | -1.7°C | 17.0°C | -8.3°C | 101 mm | 82% | 0.6 m/s | 3.7 |
| 2017 | 13.2°C | 8.1°C | 2.9°C | 23.8°C | -3.9°C | 113 mm | 81% | 0.5 m/s | 4.2 |
| 2016 | 9.1°C | 3.4°C | -2.3°C | 21.2°C | -11.0°C | 54 mm | 73% | 0.6 m/s | 5.4 |
| 2015 | 10.6°C | 5.3°C | 0.0°C | 20.1°C | -6.8°C | 68 mm | 77% | 0.6 m/s | 5 |
| 2014 | 10.6°C | 5.1°C | -0.3°C | 21.5°C | -9.2°C | 114 mm | 80% | 0.5 m/s | 4.5 |
| 2013 | 10.2°C | 4.8°C | -0.5°C | 20.9°C | -6.5°C | 82 mm | 77% | 0.6 m/s | 4.3 |
| 2012 | 10.1°C | 5.0°C | -0.2°C | 24.9°C | -4.9°C | 71 mm | 78% | 0.6 m/s | 4.5 |
| 2011 🌧️ | 11.0°C | 5.9°C | 0.7°C | 23.3°C | -4.9°C | 178 mm | 83% | 0.6 m/s | 4 |
| 2010 🔥 | 14.4°C | 8.6°C | 2.8°C | 24.5°C | -0.9°C | 39 mm | 76% | 0.5 m/s | 5 |
| 2009 | 11.5°C | 6.2°C | 0.9°C | 24.9°C | -5.3°C | 83 mm | 80% | 0.6 m/s | 4.5 |
| 2008 | 13.9°C | 8.2°C | 2.5°C | 26.8°C | -5.1°C | 93 mm | 79% | 0.5 m/s | 5.3 |
| 2007 | 8.4°C | 4.4°C | 0.4°C | 21.4°C | -7.0°C | 104 mm | 84% | 0.6 m/s | 3.6 |
| 2006 | 11.6°C | 6.2°C | 0.9°C | 19.8°C | -5.8°C | 74 mm | 80% | 0.6 m/s | 4.8 |
| 2005 | 12.1°C | 6.2°C | 0.4°C | 19.5°C | -3.6°C | 129 mm | 79% | 0.5 m/s | 4.5 |
| 2004 | 10.7°C | 5.7°C | 0.7°C | 23.8°C | -8.4°C | 78 mm | 80% | 0.5 m/s | 4.4 |
| 2003 | 9.5°C | 4.2°C | -1.2°C | 21.5°C | -12.7°C | 61 mm | 80% | 0.5 m/s | 4.2 |
| 2002 | 10.6°C | 5.9°C | 1.3°C | 24.0°C | -7.1°C | 107 mm | 80% | 0.5 m/s | 4.2 |
| 2001 | 12.0°C | 6.2°C | 0.4°C | 24.2°C | -4.5°C | 26 mm | 78% | 0.5 m/s | 5.1 |
| 2000 | 9.0°C | 4.4°C | -0.3°C | 19.5°C | -6.5°C | 121 mm | 84% | 0.6 m/s | 3.6 |
| 1999 | 11.2°C | 5.5°C | -0.3°C | 18.6°C | -4.5°C | 23 mm | 76% | 0.5 m/s | 5.3 |
| 1998 | 12.4°C | 6.7°C | 1.0°C | 18.4°C | -3.8°C | 40 mm | 77% | 0.5 m/s | 5.2 |
| 1997 | 8.9°C | 3.9°C | -1.2°C | 19.0°C | -8.9°C | 54 mm | 81% | 0.6 m/s | 4.8 |
| 1996 | 7.5°C | 3.1°C | -1.4°C | 18.2°C | -6.5°C | 141 mm | 84% | 0.5 m/s | 4 |
| 1995 | 8.3°C | 3.0°C | -2.2°C | 16.4°C | -10.6°C | 60 mm | 76% | 0.6 m/s | 4.1 |
| 1994 | 10.6°C | 5.4°C | 0.1°C | 22.2°C | -9.0°C | 107 mm | 83% | 0.6 m/s | 4.3 |
| 1993 | 10.8°C | 5.8°C | 0.9°C | 21.1°C | -3.3°C | 164 mm | 85% | 0.5 m/s | 3.5 |
| 1992 | 8.6°C | 4.0°C | -0.6°C | 21.0°C | -9.0°C | 99 mm | 82% | 0.5 m/s | 4.6 |
| 1991 | 12.1°C | 7.4°C | 2.6°C | 20.2°C | -4.2°C | 113 mm | 84% | 0.5 m/s | 4.2 |
| 1990 | 10.2°C | 5.9°C | 1.7°C | 28.6°C | -4.8°C | 115 mm | 84% | 0.5 m/s | 4.2 |
| 1989 | 8.2°C | 3.3°C | -1.6°C | 16.5°C | -5.3°C | 44 mm | 79% | 0.5 m/s | 4.5 |
| 1988 | 10.4°C | 5.5°C | 0.6°C | 18.3°C | -4.2°C | 81 mm | 81% | 0.5 m/s | 3.6 |
| 1987 | 13.0°C | 7.9°C | 2.8°C | 24.5°C | -4.7°C | 59 mm | 81% | 0.5 m/s | 4.3 |
| 1986 | 12.5°C | 7.0°C | 1.6°C | 24.1°C | -5.4°C | 50 mm | 81% | 0.5 m/s | 5.1 |
| 1985 | 10.8°C | 5.6°C | 0.5°C | 22.9°C | -9.3°C | 57 mm | 82% | 0.6 m/s | 4.4 |
| 1984 | 11.1°C | 6.1°C | 1.1°C | 20.5°C | -4.8°C | 110 mm | 83% | 0.5 m/s | 4.6 |
| 1983 | 8.4°C | 4.0°C | -0.5°C | 19.5°C | -7.1°C | 149 mm | 86% | 0.5 m/s | — |
| 1982 | 8.0°C | 2.9°C | -2.2°C | 20.7°C | -14.5°C | 66 mm | 81% | 0.7 m/s | — |
| 1981 | 10.8°C | 5.4°C | 0.0°C | 18.7°C | -7.1°C | 91 mm | 80% | 0.6 m/s | — |
Actual recorded April data for each year, 1981–2025 — sourced from NASA POWER.
The average high in April is around 10.6°C with lows near 0.3°C (mean 5.5°C), based on 45 years of NASA POWER data.
April averages 87 mm of rainfall in Watertown, about average for rainfall. The wettest on record was 178 mm in 2011.
The hottest April reached 28.7°C in 2023. The coldest dipped to -14.5°C in 1982.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average April temperatures have risen by about 1.6°C. Daytime highs moved from 9.8°C to 11.8°C and overnight lows from -0.2°C to 1°C over the same span.
April is one of the cooler months of the year in Watertown and about average for rainfall, so plan for around 10.6°C daytime highs and 0.3°C at night.
Not quite — April is the 6th coolest month in Watertown, averaging 5.5°C.
For April in Watertown, pack warm layers and a jacket for chilly mornings, with typical highs of 10.6°C and lows of 0.3°C. Bring an umbrella or light rain jacket too.
Relative humidity in April averages 80% — quite humid.
Average wind speed in April is 0.5 m/s. The windiest April on record averaged 0.7 m/s (1982).
The wettest April on record was 2011 with 178 mm. On average, April sees 87 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 April, 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 April specifically, along with year-by-year records and how the month has changed over the decades.
