April is one of the warmer months of the year in Whyalla, with average highs near 23.9°C and lows around 14.7°C (mean 19.3°C). It is about average for rainfall, averaging 20 mm of rainfall and 59% relative humidity across the period.
April is one of the warmer months of the year in Whyalla. Across 45 years of records, the warmest April in Whyalla was 2018 — when the month averaged 22.3°C — while the coldest was 1983 at 16.9°C. Typical April days reach 23.9°C with nights near 14.7°C. The long-term trend is warming, about 0.3°C per decade.
April is about average for rainfall in Whyalla, averaging 20 mm of rainfall. The wettest April on record was 2014 with 90 mm, while the driest was 1997 at 0 mm.
Relative humidity in Whyalla during April averages 59%. The most humid April was 2014 at 67%, and the least humid was 2019 at 51%.
April receives about 4.4 kWh/m²/day of solar energy in Whyalla. The sunniest Aprils were 1994, 2005 and 2018, among others at 4.7 kWh/m²/day, and the cloudiest were 2015, 2017 and 2020, among others at 4.
Average wind speed in Whyalla during April is 3.6 m/s. The windiest April was 1986 at 4.5 m/s, while the calmest was 2013 at 3.1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 18.8°C | 18.6°C | 19.6°C | 19.8°C | 19.5°C | +0.7°C |
| Avg High | 23.5°C | 23.1°C | 24.4°C | 24.3°C | 24.0°C | +0.5°C |
| Avg Low | 14.1°C | 14.0°C | 14.8°C | 15.3°C | 15.1°C | +1°C |
| Avg Rain | 19 mm | 16 mm | 17 mm | 26 mm | 19 mm | +0 mm |
April temperatures in Whyalla have risen by about 1°C between 1981–1985 and 2021–2025.
April has ranged from a record low of 8°C (1983) to a record high of 35.4°C (2018).
Rainfall in April is about average for rainfall, averaging 20 mm, with a wettest year of 90 mm.
One of the best times to visit Whyalla
April is one of the best times to visit Whyalla. Expect days averaging 23.9°C and nights around 14.7°C (mean 19.3°C) — close to Whyalla's yearly average — with low rainfall (20 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 | 25.7°C | 21.3°C | 17.0°C | 32.7°C | 13.6°C | 4 mm | 56% | 3.4 m/s | 4.3 |
| 2024 | 22.0°C | 17.8°C | 13.7°C | 26.8°C | 10.3°C | 12 mm | 63% | 3.9 m/s | 4.4 |
| 2023 | 23.5°C | 19.0°C | 14.4°C | 28.9°C | 11.5°C | 23 mm | 59% | 3.8 m/s | 4.3 |
| 2022 | 25.1°C | 20.6°C | 16.0°C | 31.6°C | 12.2°C | 30 mm | 59% | 3.4 m/s | 4.1 |
| 2021 | 24.5°C | 19.7°C | 15.0°C | 32.0°C | 11.8°C | 6 mm | 56% | 3.2 m/s | 4.5 |
| 2020 | 23.2°C | 18.7°C | 14.2°C | 28.8°C | 11.2°C | 39 mm | 63% | 3.7 m/s | 4 |
| 2019 | 25.4°C | 20.4°C | 15.4°C | 32.5°C | 10.9°C | 5 mm | 51% | 4 m/s | 4.4 |
| 2018 🔥 | 27.5°C | 22.3°C | 17.1°C | 35.4°C | 12.6°C | 4 mm | 52% | 3.6 m/s | 4.7 |
| 2017 | 23.8°C | 19.6°C | 15.4°C | 30.1°C | 12.3°C | 23 mm | 59% | 3.4 m/s | 4 |
| 2016 | 24.7°C | 20.0°C | 15.4°C | 31.0°C | 11.7°C | 19 mm | 59% | 3.7 m/s | 4.4 |
| 2015 | 21.3°C | 17.6°C | 13.9°C | 30.3°C | 9.7°C | 46 mm | 63% | 3.9 m/s | 4 |
| 2014 🌧️ | 23.3°C | 19.3°C | 15.3°C | 33.5°C | 11.9°C | 90 mm | 67% | 3.8 m/s | 4.1 |
| 2013 | 24.8°C | 20.2°C | 15.7°C | 29.9°C | 11.6°C | 28 mm | 58% | 3.1 m/s | 4.3 |
| 2012 | 24.4°C | 19.8°C | 15.2°C | 32.9°C | 10.4°C | 11 mm | 58% | 3.4 m/s | 4.5 |
| 2011 | 23.0°C | 18.5°C | 13.9°C | 28.5°C | 11.4°C | 11 mm | 63% | 3.4 m/s | 4.5 |
| 2010 | 25.1°C | 20.5°C | 15.9°C | 30.2°C | 11.1°C | 23 mm | 59% | 3.2 m/s | 4.1 |
| 2009 | 23.9°C | 19.3°C | 14.8°C | 33.5°C | 11.9°C | 22 mm | 59% | 3.7 m/s | 4.4 |
| 2008 | 23.3°C | 18.7°C | 14.0°C | 29.4°C | 9.7°C | 18 mm | 53% | 3.8 m/s | 4.2 |
| 2007 | 24.4°C | 19.7°C | 15.0°C | 30.7°C | 11.8°C | 30 mm | 60% | 3.7 m/s | 4.4 |
| 2006 | 22.2°C | 17.8°C | 13.4°C | 28.0°C | 9.7°C | 31 mm | 62% | 4.1 m/s | 4 |
| 2005 | 27.0°C | 21.7°C | 16.3°C | 34.9°C | 12.0°C | 8 mm | 51% | 3.7 m/s | 4.7 |
| 2004 | 24.8°C | 20.3°C | 15.7°C | 32.8°C | 11.5°C | 5 mm | 56% | 3.6 m/s | 4.1 |
| 2003 | 24.2°C | 19.3°C | 14.5°C | 29.8°C | 10.3°C | 15 mm | 57% | 3.3 m/s | 4.3 |
| 2002 | 26.1°C | 21.0°C | 15.8°C | 31.3°C | 11.4°C | 2 mm | 54% | 3.2 m/s | 4.4 |
| 2001 | 23.8°C | 19.0°C | 14.2°C | 30.9°C | 10.6°C | 10 mm | 56% | 3.7 m/s | 4.5 |
| 2000 | 24.3°C | 19.5°C | 14.7°C | 29.1°C | 10.6°C | 32 mm | 62% | 3.5 m/s | 4.5 |
| 1999 | 22.6°C | 17.9°C | 13.2°C | 28.4°C | 9.1°C | 4 mm | 58% | 3.3 m/s | 4.6 |
| 1998 | 21.9°C | 17.6°C | 13.2°C | 32.2°C | 10.3°C | 49 mm | 60% | 3.8 m/s | 4 |
| 1997 | 24.3°C | 19.4°C | 14.5°C | 29.4°C | 10.8°C | 0 mm | 58% | 3.3 m/s | 4.4 |
| 1996 | 21.8°C | 17.8°C | 13.8°C | 32.1°C | 10.9°C | 4 mm | 61% | 4 m/s | 4.1 |
| 1995 | 21.3°C | 17.1°C | 12.8°C | 27.3°C | 10.2°C | 25 mm | 61% | 3.6 m/s | 4.3 |
| 1994 | 23.5°C | 19.1°C | 14.7°C | 29.3°C | 12.3°C | 4 mm | 57% | 3.7 m/s | 4.7 |
| 1993 | 25.3°C | 20.1°C | 14.9°C | 30.3°C | 12.4°C | 1 mm | 52% | 3.2 m/s | 4.6 |
| 1992 | 23.1°C | 18.8°C | 14.4°C | 32.9°C | 9.8°C | 41 mm | 62% | 3.3 m/s | 4.2 |
| 1991 | 23.8°C | 19.2°C | 14.5°C | 32.1°C | 10.6°C | 15 mm | 58% | 3.6 m/s | 4.5 |
| 1990 | 23.4°C | 18.9°C | 14.4°C | 29.8°C | 10.1°C | 20 mm | 61% | 4.4 m/s | 4.6 |
| 1989 | 23.1°C | 18.6°C | 14.2°C | 29.5°C | 11.6°C | 26 mm | 66% | 3.4 m/s | 4.5 |
| 1988 | 23.8°C | 19.0°C | 14.3°C | 27.7°C | 11.8°C | 6 mm | 62% | 3.9 m/s | 4.5 |
| 1987 | 24.3°C | 19.2°C | 14.2°C | 31.0°C | 10.7°C | 7 mm | 54% | 3.5 m/s | 4.4 |
| 1986 | 23.6°C | 18.8°C | 13.9°C | 34.6°C | 10.7°C | 8 mm | 56% | 4.5 m/s | 4.4 |
| 1985 | 23.5°C | 18.8°C | 14.1°C | 35.3°C | 11.4°C | 23 mm | 56% | 3.7 m/s | 4.7 |
| 1984 | 22.6°C | 18.0°C | 13.5°C | 29.1°C | 9.6°C | 34 mm | 62% | 3.7 m/s | 4.4 |
| 1983 ❄️ | 21.0°C | 16.9°C | 12.9°C | 25.0°C | 8.0°C | 47 mm | 63% | 4.3 m/s | — |
| 1982 | 23.7°C | 19.0°C | 14.3°C | 30.7°C | 11.2°C | 15 mm | 57% | 3.6 m/s | — |
| 1981 | 26.2°C | 20.9°C | 15.6°C | 31.3°C | 10.4°C | 3 mm | 55% | 3.3 m/s | — |
Actual recorded April data for each year, 1981–2025 — sourced from NASA POWER.
The average high in April is around 23.9°C with lows near 14.7°C (mean 19.3°C), based on 45 years of NASA POWER data.
April averages 20 mm of rainfall in Whyalla, about average for rainfall. The wettest on record was 90 mm in 2014.
The hottest April reached 35.4°C in 2018. The coldest dipped to 8°C in 1983.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average April temperatures have risen by about 1°C. Daytime highs moved from 23.4°C to 24.2°C and overnight lows from 14.1°C to 15.2°C over the same span.
April is one of the warmer months of the year in Whyalla and about average for rainfall, so plan for around 23.9°C daytime highs and 14.7°C at night.
Not quite — April is the 7th coolest month in Whyalla, averaging 19.3°C.
For April in Whyalla, pack light layers you can adjust through the day, with typical highs of 23.9°C and lows of 14.7°C.
Relative humidity in April averages 59% — moderately humid.
Average wind speed in April is 3.6 m/s. The windiest April on record averaged 4.5 m/s (1986).
The wettest April on record was 2014 with 90 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 Whyalla 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.
