April is one of the cooler months of the year in Ajax, with average highs near 10.3°C and lows around 0.6°C (mean 5.5°C). It is about average for rainfall, averaging 59 mm of rainfall and 78% relative humidity across the period.
April is one of the cooler months of the year in Ajax. Across 45 years of records, the warmest Aprils in Ajax were 1987 and 2010 — when the month averaged 8.5°C — while the coldest was 2018 at 2.1°C. Typical April days reach 10.3°C with nights near 0.6°C. The long-term April temperature trend is broadly flat.
April is about average for rainfall in Ajax, averaging 59 mm of rainfall. The wettest April on record was 2009 with 123 mm, while the driest was 1997 at 20 mm.
Relative humidity in Ajax during April averages 78%. The most humid Aprils were 1984 and 2004 at 83%, and the least humid was 1998 at 72%.
April receives about 4.5 kWh/m²/day of solar energy in Ajax. The sunniest April was 2010 at 5.3 kWh/m²/day, and the cloudiest were 1996 and 2019 at 3.7.
Average wind speed in Ajax during April is 3.8 m/s. The windiest April was 1982 at 4.8 m/s, while the calmest were 1998, 2001 and 2008, among others at 3.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 5.6°C | 5.3°C | 5.5°C | 5.2°C | 6.0°C | +0.4°C |
| Avg High | 10.6°C | 10.1°C | 10.2°C | 9.9°C | 10.7°C | +0.1°C |
| Avg Low | 0.5°C | 0.5°C | 0.7°C | 0.4°C | 1.3°C | +0.8°C |
| Avg Rain | 44 mm | 52 mm | 80 mm | 62 mm | 52 mm | +8 mm |
April temperatures in Ajax have risen by about 1.2°C between 1981–1985 and 2021–2025.
April has ranged from a record low of -13.3°C (2003) to a record high of 25.4°C (1987).
Rainfall in April is about average for rainfall, averaging 59 mm, with a wettest year of 123 mm.
Daytime highs and overnight lows have shifted differently — highs fell about 0.1°C per decade while lows rose 0.1°C per decade, narrowing the gap between day and night.
A good time to visit Ajax
April is a good time to visit Ajax, with days averaging 10.3°C and nights around 0.6°C (mean 5.5°C, cooler than Ajax's yearly average) and moderate 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 | 10.7°C | 5.7°C | 0.6°C | 20.1°C | -5.6°C | 44 mm | 75% | 4 m/s | 4.6 |
| 2024 | 11.7°C | 7.1°C | 2.5°C | 19.2°C | -4.0°C | 83 mm | 77% | 4 m/s | 4.1 |
| 2023 | 12.0°C | 7.0°C | 2.1°C | 24.5°C | -5.4°C | 74 mm | 79% | 3.5 m/s | 4.6 |
| 2022 | 9.6°C | 5.0°C | 0.5°C | 17.3°C | -3.4°C | 35 mm | 77% | 3.8 m/s | 4.6 |
| 2021 | 10.9°C | 6.4°C | 1.9°C | 17.9°C | -4.7°C | 52 mm | 76% | 3.5 m/s | 4.5 |
| 2020 | 9.1°C | 4.5°C | 0.0°C | 13.9°C | -3.9°C | 26 mm | 74% | 4.1 m/s | 4.6 |
| 2019 | 9.2°C | 5.0°C | 0.7°C | 15.9°C | -4.8°C | 62 mm | 81% | 3.9 m/s | 3.7 |
| 2018 ❄️ | 6.0°C | 2.1°C | -1.7°C | 14.6°C | -7.1°C | 95 mm | 79% | 4.1 m/s | 4.2 |
| 2017 | 12.1°C | 7.2°C | 2.4°C | 19.3°C | -3.1°C | 89 mm | 81% | 4.1 m/s | 4.3 |
| 2016 | 8.0°C | 3.2°C | -1.7°C | 19.6°C | -10.4°C | 42 mm | 75% | 3.3 m/s | 4.8 |
| 2015 | 11.1°C | 5.8°C | 0.6°C | 18.4°C | -4.1°C | 54 mm | 75% | 3.9 m/s | 4.8 |
| 2014 | 9.6°C | 4.6°C | -0.3°C | 17.0°C | -6.6°C | 80 mm | 79% | 4.1 m/s | 4.6 |
| 2013 | 8.9°C | 4.3°C | -0.2°C | 20.2°C | -5.6°C | 57 mm | 79% | 4.2 m/s | 4.4 |
| 2012 | 10.6°C | 5.5°C | 0.4°C | 21.0°C | -3.4°C | 36 mm | 72% | 3.9 m/s | 4.7 |
| 2011 | 9.9°C | 5.4°C | 0.8°C | 18.5°C | -4.1°C | 66 mm | 80% | 4 m/s | 3.8 |
| 2010 | 13.7°C | 8.5°C | 3.3°C | 19.7°C | -1.2°C | 39 mm | 72% | 3.4 m/s | 5.3 |
| 2009 🌧️ | 10.4°C | 5.8°C | 1.1°C | 22.3°C | -4.6°C | 123 mm | 81% | 4.2 m/s | 4.7 |
| 2008 | 12.3°C | 7.2°C | 2.0°C | 20.6°C | -4.7°C | 59 mm | 80% | 3.2 m/s | 5.2 |
| 2007 | 8.6°C | 4.6°C | 0.5°C | 20.0°C | -7.1°C | 71 mm | 82% | 4 m/s | 3.9 |
| 2006 | 11.8°C | 6.7°C | 1.6°C | 20.7°C | -4.5°C | 53 mm | 79% | 3.5 m/s | 5 |
| 2005 | 11.1°C | 6.0°C | 1.0°C | 20.9°C | -2.3°C | 86 mm | 78% | 3.5 m/s | 4.5 |
| 2004 | 10.0°C | 5.5°C | 1.0°C | 19.0°C | -7.2°C | 111 mm | 83% | 3.8 m/s | 4.4 |
| 2003 | 8.3°C | 3.2°C | -1.8°C | 20.9°C | -13.3°C | 57 mm | 81% | 3.7 m/s | 4.5 |
| 2002 | 9.0°C | 4.8°C | 0.7°C | 22.5°C | -4.8°C | 104 mm | 83% | 3.4 m/s | 4 |
| 2001 | 11.0°C | 5.8°C | 0.5°C | 20.0°C | -3.7°C | 48 mm | 79% | 3.2 m/s | 4.7 |
| 2000 | 9.5°C | 5.0°C | 0.5°C | 18.6°C | -5.2°C | 84 mm | 79% | 3.6 m/s | 3.9 |
| 1999 | 11.1°C | 6.0°C | 0.8°C | 18.8°C | -3.3°C | 47 mm | 75% | 3.5 m/s | 4.9 |
| 1998 | 12.3°C | 6.9°C | 1.5°C | 18.6°C | -2.3°C | 37 mm | 72% | 3.2 m/s | 5.1 |
| 1997 | 9.4°C | 4.5°C | -0.3°C | 19.0°C | -8.6°C | 20 mm | 75% | 3.6 m/s | 4.7 |
| 1996 | 7.7°C | 3.2°C | -1.2°C | 17.7°C | -4.8°C | 78 mm | 79% | 4 m/s | 3.7 |
| 1995 | 7.8°C | 3.2°C | -1.4°C | 14.5°C | -7.8°C | 37 mm | 74% | 4 m/s | 4.2 |
| 1994 | 11.2°C | 5.6°C | 0.0°C | 20.9°C | -5.1°C | 68 mm | 77% | 4.1 m/s | 4.8 |
| 1993 | 10.0°C | 5.5°C | 0.9°C | 17.5°C | -2.9°C | 44 mm | 80% | 3.5 m/s | 4 |
| 1992 | 9.0°C | 4.7°C | 0.4°C | 17.1°C | -7.1°C | 63 mm | 77% | 3.2 m/s | 4.1 |
| 1991 | 11.7°C | 7.3°C | 2.9°C | 22.1°C | -3.7°C | 74 mm | 81% | 3.9 m/s | 3.9 |
| 1990 | 11.2°C | 6.4°C | 1.7°C | 25.4°C | -5.0°C | 51 mm | 79% | 3.6 m/s | 4.5 |
| 1989 | 9.4°C | 4.2°C | -1.0°C | 16.2°C | -4.6°C | 41 mm | 72% | 3.2 m/s | 4.4 |
| 1988 | 10.7°C | 5.6°C | 0.4°C | 16.8°C | -3.6°C | 34 mm | 76% | 3.8 m/s | 4.1 |
| 1987 🔥 | 13.5°C | 8.5°C | 3.5°C | 25.4°C | -3.6°C | 39 mm | 76% | 3.8 m/s | 4.6 |
| 1986 | 12.0°C | 6.8°C | 1.6°C | 21.8°C | -4.8°C | 44 mm | 77% | 3.5 m/s | 4.8 |
| 1985 | 10.8°C | 5.8°C | 0.9°C | 22.8°C | -7.8°C | 35 mm | 82% | 3.9 m/s | 5.2 |
| 1984 | 10.5°C | 5.9°C | 1.3°C | 20.1°C | -3.2°C | 53 mm | 83% | 3.6 m/s | 4.6 |
| 1983 | 8.9°C | 4.4°C | -0.1°C | 17.5°C | -4.3°C | 60 mm | 82% | 3.8 m/s | — |
| 1982 | 8.5°C | 3.2°C | -2.2°C | 17.9°C | -13.1°C | 38 mm | 77% | 4.8 m/s | — |
| 1981 | 11.1°C | 5.7°C | 0.3°C | 18.4°C | -5.3°C | 53 mm | 75% | 4.4 m/s | — |
Actual recorded April data for each year, 1981–2025 — sourced from NASA POWER.
The average high in April is around 10.3°C with lows near 0.6°C (mean 5.5°C), based on 45 years of NASA POWER data.
April averages 59 mm of rainfall in Ajax, about average for rainfall. The wettest on record was 123 mm in 2009.
The hottest April reached 25.4°C in 1987. The coldest dipped to -13.3°C in 2003.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average April temperatures have risen by about 1.2°C. Daytime highs moved from 10°C to 11°C and overnight lows from 0°C to 1.5°C over the same span.
April is one of the cooler months of the year in Ajax and about average for rainfall, so plan for around 10.3°C daytime highs and 0.6°C at night.
Not quite — April is the 6th coolest month in Ajax, averaging 5.5°C.
For April in Ajax, pack warm layers and a jacket for chilly mornings, with typical highs of 10.3°C and lows of 0.6°C. Bring an umbrella or light rain jacket too.
Relative humidity in April averages 78% — quite humid.
Average wind speed in April is 3.8 m/s. The windiest April on record averaged 4.8 m/s (1982).
The wettest April on record was 2009 with 123 mm. On average, April sees 59 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 Ajax 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.
