April is one of the warmer months of the year in Onslow, with average highs near 30.9°C and lows around 25.5°C (mean 28.2°C). It is about average for rainfall, averaging 20 mm of rainfall and 62% relative humidity across the period.
April is one of the warmer months of the year in Onslow. Across 45 years of records, the warmest April in Onslow was 2018 — when the month averaged 29.7°C — while the coldest was 2015 at 26.4°C. Typical April days reach 30.9°C with nights near 25.5°C. The long-term April temperature trend is broadly flat.
April is about average for rainfall in Onslow, averaging 20 mm of rainfall. The wettest April on record was 2014 with 89 mm, while the driest were 1990 and 2020 at 0 mm.
Relative humidity in Onslow during April averages 62%. The most humid April was 2008 at 72%, and the least humid was 1986 at 54%.
April receives about 5.3 kWh/m²/day of solar energy in Onslow. The sunniest Aprils were 2001 and 2002 at 5.9 kWh/m²/day, and the cloudiest was 2015 at 4.4.
Average wind speed in Onslow during April is 3.9 m/s. The windiest April was 2015 at 4.6 m/s, while the calmest was 1988 at 3 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 28.6°C | 27.9°C | 27.9°C | 28.2°C | 28.5°C | -0.1°C |
| Avg High | 31.3°C | 30.6°C | 30.6°C | 31.0°C | 31.0°C | -0.3°C |
| Avg Low | 25.9°C | 25.3°C | 25.2°C | 25.4°C | 26.0°C | +0.1°C |
| Avg Rain | 17 mm | 24 mm | 21 mm | 19 mm | 17 mm | 0 mm |
April temperatures in Onslow have stayed relatively stable across the record.
April has ranged from a record low of 18.9°C (2006) to a record high of 37°C (2018).
Rainfall in April is about average for rainfall, averaging 20 mm, with a wettest year of 89 mm.
A quieter season to visit Onslow
If your dates are flexible, the more temperate months of September and August tend to be the most comfortable for visiting Onslow. That said, April — with days averaging 30.9°C and nights around 25.5°C (mean 28.2°C) and low rainfall (20 mm) — can still be rewarding for travellers who don't mind the warmth, and often means fewer crowds.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 32.1°C | 29.6°C | 27.0°C | 35.5°C | 23.8°C | 1 mm | 60% | 4.1 m/s | 5.5 |
| 2024 | 31.4°C | 28.8°C | 26.3°C | 34.9°C | 23.7°C | 28 mm | 59% | 3.6 m/s | 5.5 |
| 2023 | 29.6°C | 27.0°C | 24.3°C | 31.8°C | 21.4°C | 2 mm | 57% | 4.3 m/s | 5.4 |
| 2022 | 30.2°C | 27.6°C | 25.1°C | 33.3°C | 21.1°C | 24 mm | 64% | 4 m/s | 5.1 |
| 2021 | 31.0°C | 28.6°C | 26.1°C | 33.7°C | 23.4°C | 46 mm | 61% | 3.6 m/s | 5.6 |
| 2020 | 31.7°C | 29.3°C | 26.9°C | 34.5°C | 24.1°C | 0 mm | 61% | 3.6 m/s | 5.3 |
| 2019 | 31.3°C | 28.2°C | 25.2°C | 34.8°C | 20.1°C | 23 mm | 61% | 4.4 m/s | 5.3 |
| 2018 🔥 | 33.0°C | 29.7°C | 26.4°C | 37.0°C | 23.8°C | 1 mm | 55% | 3.9 m/s | 5.6 |
| 2017 | 31.0°C | 28.3°C | 25.7°C | 34.0°C | 22.4°C | 7 mm | 59% | 3.6 m/s | 5.5 |
| 2016 | 32.5°C | 29.1°C | 25.7°C | 36.7°C | 22.0°C | 2 mm | 55% | 4.2 m/s | 5.5 |
| 2015 ❄️ | 28.7°C | 26.4°C | 24.0°C | 32.6°C | 19.8°C | 26 mm | 68% | 4.6 m/s | 4.4 |
| 2014 🌧️ | 30.3°C | 27.7°C | 25.1°C | 32.6°C | 21.9°C | 89 mm | 62% | 3.8 m/s | 5.4 |
| 2013 | 31.2°C | 28.7°C | 26.3°C | 33.1°C | 22.6°C | 4 mm | 63% | 3.5 m/s | 5.4 |
| 2012 | 31.1°C | 28.1°C | 25.2°C | 33.7°C | 23.4°C | 0 mm | 56% | 4.1 m/s | 5.4 |
| 2011 | 30.7°C | 28.3°C | 25.8°C | 32.7°C | 23.9°C | 32 mm | 65% | 3.3 m/s | 5.1 |
| 2010 | 29.8°C | 27.0°C | 24.2°C | 34.1°C | 22.1°C | 0 mm | 65% | 4.3 m/s | 5.4 |
| 2009 | 30.2°C | 27.5°C | 24.7°C | 33.8°C | 22.7°C | 1 mm | 61% | 4 m/s | 5 |
| 2008 | 29.6°C | 27.1°C | 24.6°C | 32.6°C | 19.7°C | 15 mm | 72% | 3.6 m/s | 5 |
| 2007 | 30.7°C | 28.2°C | 25.7°C | 33.6°C | 22.9°C | 26 mm | 62% | 3.6 m/s | 5.3 |
| 2006 | 29.3°C | 26.7°C | 24.2°C | 31.3°C | 18.9°C | 62 mm | 68% | 4.1 m/s | 5.1 |
| 2005 | 32.0°C | 29.0°C | 26.0°C | 35.7°C | 22.0°C | 81 mm | 58% | 4.2 m/s | 4.8 |
| 2004 | 31.3°C | 28.6°C | 25.9°C | 34.0°C | 23.7°C | 7 mm | 59% | 3.7 m/s | 5.5 |
| 2003 | 30.5°C | 27.7°C | 24.9°C | 33.0°C | 21.2°C | 9 mm | 62% | 3.7 m/s | 5.3 |
| 2002 | 31.3°C | 28.2°C | 25.0°C | 33.8°C | 22.7°C | 1 mm | 60% | 4.3 m/s | 5.9 |
| 2001 | 31.4°C | 28.6°C | 25.8°C | 33.6°C | 23.7°C | 2 mm | 62% | 3.4 m/s | 5.9 |
| 2000 | 29.9°C | 27.5°C | 25.1°C | 32.4°C | 19.0°C | 5 mm | 70% | 3.7 m/s | 5.2 |
| 1999 | 30.1°C | 27.1°C | 24.1°C | 32.6°C | 20.9°C | 21 mm | 63% | 3.6 m/s | 5.2 |
| 1998 | 30.9°C | 28.6°C | 26.3°C | 34.0°C | 23.6°C | 39 mm | 65% | 3.1 m/s | 4.6 |
| 1997 | 30.5°C | 27.8°C | 25.1°C | 32.7°C | 22.4°C | 10 mm | 62% | 3.2 m/s | 5.2 |
| 1996 | 31.2°C | 28.5°C | 25.8°C | 34.2°C | 21.2°C | 71 mm | 64% | 4.1 m/s | 5.1 |
| 1995 | 30.0°C | 27.6°C | 25.2°C | 32.5°C | 21.6°C | 26 mm | 67% | 3.7 m/s | 4.9 |
| 1994 | 31.5°C | 28.3°C | 25.0°C | 33.4°C | 21.7°C | 0 mm | 57% | 3.5 m/s | 5.8 |
| 1993 | 30.7°C | 27.9°C | 25.1°C | 33.3°C | 23.5°C | 11 mm | 63% | 3.4 m/s | 5.1 |
| 1992 | 29.3°C | 27.0°C | 24.7°C | 33.4°C | 23.2°C | 51 mm | 68% | 4.2 m/s | 5.1 |
| 1991 | 31.2°C | 28.8°C | 26.5°C | 33.4°C | 23.7°C | 9 mm | 64% | 4.1 m/s | 5.5 |
| 1990 | 30.8°C | 27.8°C | 24.9°C | 34.8°C | 22.3°C | 0 mm | 61% | 4.3 m/s | 5.5 |
| 1989 | 31.5°C | 28.7°C | 25.9°C | 34.8°C | 20.6°C | 26 mm | 60% | 4.5 m/s | 5.4 |
| 1988 | 31.1°C | 29.1°C | 27.2°C | 33.6°C | 25.6°C | 23 mm | 61% | 3 m/s | 4.9 |
| 1987 | 31.2°C | 28.9°C | 26.5°C | 34.6°C | 23.9°C | 51 mm | 65% | 3.8 m/s | 5.1 |
| 1986 | 32.1°C | 28.7°C | 25.3°C | 34.8°C | 22.0°C | 1 mm | 54% | 4.3 m/s | 5.6 |
| 1985 | 31.4°C | 28.7°C | 25.9°C | 36.4°C | 22.9°C | 33 mm | 63% | 4.4 m/s | 5.1 |
| 1984 | 30.5°C | 28.1°C | 25.7°C | 33.4°C | 23.9°C | 10 mm | 64% | 3.7 m/s | 5.5 |
| 1983 | 30.2°C | 27.9°C | 25.5°C | 32.5°C | 22.7°C | 6 mm | 63% | 4.4 m/s | — |
| 1982 | 31.7°C | 29.2°C | 26.6°C | 33.6°C | 24.9°C | 2 mm | 58% | 3.7 m/s | — |
| 1981 | 31.6°C | 28.2°C | 24.9°C | 34.1°C | 22.7°C | 0 mm | 61% | 3.9 m/s | — |
Actual recorded April data for each year, 1981–2025 — sourced from NASA POWER.
The average high in April is around 30.9°C with lows near 25.5°C (mean 28.2°C), based on 45 years of NASA POWER data.
April averages 20 mm of rainfall in Onslow, about average for rainfall. The wettest on record was 89 mm in 2014.
The hottest April reached 37°C in 2018. The coldest dipped to 18.9°C in 2006.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average April temperatures have fallen by about 0.1°C — but days and nights have moved in opposite directions. Overnight lows rose from 25.7°C to 25.8°C while daytime highs eased from 31.1°C to 30.9°C, narrowing the gap between day and night.
April is one of the warmer months of the year in Onslow and about average for rainfall, so plan for around 30.9°C daytime highs and 25.5°C at night.
Not quite — April is the 9th coolest month in Onslow, averaging 28.2°C.
For April in Onslow, pack light, breathable clothing and sun protection, with typical highs of 30.9°C and lows of 25.5°C.
Relative humidity in April averages 62% — moderately humid.
Average wind speed in April is 3.9 m/s. The windiest April on record averaged 4.6 m/s (2015).
The wettest April on record was 2014 with 89 mm. On average, April sees 20 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 Onslow 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.
