Onslow Airport is a weather station located 10 m above sea level, 4 km from Onslow. Its records go back to 1941: 55 years of temperature are available up to 2025, along with rainfall and a comparison with two reference normals. Over the whole series (55 years) the annual mean temperature there is 25.7 °C; the 1961–1990 and 1991–2020 reference periods are not documented well enough for a comparison. The warmest year of the series is 2024 (27.3 °C) and the coldest 1952 (24.4 °C). The last complete year, 2025, ranks 2 out of 55, from warmest to coldest. Over 1961–2025, the annual mean temperature changes by +0.27 °C per decade. The station ranks 38 out of 227 stations, from the fastest rise to the slowest.
Annual mean temperature since 1941
The first ten years of the series (1944–1953) average 25.0 °C; the last ten (2016–2025) average 26.7 °C, a difference of +1.7 °C. All of the 10 warmest years in the series fall after 1999; the warmest is 2024 (27.3 °C). The ten-year running mean peaks at 26.7 °C (2025) and bottoms out at 25.0 °C (1953).
Annual rainfall since 1941
On average 319 mm of rain falls per year over the 46 documented years. The wettest year, 1961, received 1085 mm; the driest, 1944, only 26 mm, which is 41.7 times less. Between 2000 and 2025, 7 years out of 20 exceeded the series average.
Records at Onslow Airport
- Warmest year: 27.3 °C, in 2024
- Coldest year: 24.4 °C, in 1952
- Driest year: 26 mm, in 1944
- Wettest year: 1085 mm, in 1961
- Warmest month: 32.9 °C, in January 2003
- Coldest month: 17.1 °C, in July 1957
- Wettest month: 368 mm, in March 2000
- Hottest day: 50.7 °C, on 13 January 2022
- Coldest day: 3.5 °C, on 29 June 1946
- Heaviest rain in one day: 312.2 mm, on 3 March 1961
2.9 °C separate the warmest year of the series from the coldest. Between the hottest and the coldest day on record, the range reaches 47.2 °C.
Temperature trend over 1961–2025
The regression line of annual mean temperature changes by +0.27 °C per decade between 1961 and 2025, about +1.7 °C over the whole period. That is faster than the median of the 227 stations (+0.19 °C per decade), by 0.08 °C per decade: the station ranks 38 out of 227.
The last 24 months against the 1991–2020 normal
Over the last 24 months (October 2024 to September 2026), 13 months out of 20 were warmer than the 1991–2020 normal for the same month; the mean departure is +0.6 °C. The highest departure was in September 2026 (+2.0 °C); the lowest, in April 2026 (−0.9 °C).
| Month | Temperature | Departure from normal | Rain | Normal rain |
|---|---|---|---|---|
| October 2024 | 27.5 °C | +1.1 °C | 1 mm | 1 mm |
| November 2024 | 29.1 °C | +1.4 °C | 0 mm | 2 mm |
| December 2024 | 32.3 °C | – | 2 mm | 6 mm |
| January 2025 | 32.0 °C | – | 194 mm | – |
| February 2025 | 32.7 °C | +1.7 °C | 9 mm | – |
| March 2025 | 32.4 °C | +1.5 °C | 23 mm | 73 mm |
| April 2025 | 30.1 °C | +1.5 °C | 4 mm | 11 mm |
| May 2025 | 25.2 °C | +1.1 °C | 6 mm | 31 mm |
| June 2025 | 21.6 °C | +0.7 °C | 13 mm | 38 mm |
| July 2025 | 19.6 °C | −0.7 °C | 1 mm | – |
| August 2025 | 22.0 °C | +0.7 °C | 32 mm | 4 mm |
| September 2025 | 24.4 °C | +0.9 °C | 4 mm | 1 mm |
| October 2025 | 27.8 °C | +1.4 °C | 0 mm | 1 mm |
| November 2025 | 27.2 °C | −0.5 °C | 0 mm | 2 mm |
| December 2025 | 31.1 °C | – | 0 mm | 6 mm |
| January 2026 | 31.3 °C | – | 1 mm | – |
| February 2026 | 30.7 °C | −0.3 °C | 56 mm | – |
| March 2026 | 30.6 °C | −0.3 °C | 136 mm | 73 mm |
| April 2026 | 27.7 °C | −0.9 °C | 0 mm | 11 mm |
| May 2026 | 23.9 °C | −0.2 °C | 0 mm | 31 mm |
| June 2026 | 20.8 °C | −0.1 °C | 65 mm | 38 mm |
| July 2026 | 20.5 °C | +0.2 °C | 1 mm | – |
| August 2026 | 22.3 °C | +1.0 °C | 0 mm | 4 mm |
| September 2026 | 25.5 °C | +2.0 °C | 5 mm | 1 mm |
Data source and licence
Data source: Bureau of Meteorology (ACORN-SAT) and NOAA NCEI (GHCN-Daily) (dataset “ACORN-SAT v2 daily (homogenised) + GHCN-Daily”), licence CC BY 4.0; Public domain (NOAA NCEI). Last updated: 29 October 2026.
The data for Onslow Airport are shown as the source publishes them; this site does not correct them. A year is kept only if at least eleven months of measurements are available, and a normal is computed only with at least twenty years of data out of its thirty. Temperatures are rounded to 0.1 °C and rainfall to the millimetre. The station is one of 227 stations in Australia: the overview page lets you compare them.
Frequently asked questions
What is the annual mean temperature at Onslow Airport?
Over the whole series (55 years), the annual mean temperature at Onslow Airport is 25.7 °C.
What is the warmest year ever measured at Onslow Airport?
Since records began in 1941, the warmest year at Onslow Airport is 2024, at 27.3 °C on average. The coldest is 1952 (24.4 °C).
Is the climate at Onslow Airport getting warmer?
Yes: at Onslow Airport, the annual mean temperature rises by 0.27 °C per decade between 1961 and 2025, +1.7 °C in total. 10 of the 10 warmest years in the series fall after 1999.
Towns near this station
Neighbouring stations