WEATHER · CLIMATE NORMALS · 1991–2020
Adelaide Climate — Averages by Month
What the weather in Adelaide, AUaverages across a standard 30-year period. Each month's figure is the 1991–2020 mean temperature and total rainfall from the ERA5 reanalysis — the long-run normal a place settles around, not a forecast for any particular day.
Month-by-month normals
| Month | Avg temperature | Avg rainfall |
|---|---|---|
| January | 20.7 °C · warmest | 21.5 mm |
| February | 20.7 °C | 21.0 mm |
| March | 19.0 °C | 21.4 mm |
| April | 16.7 °C | 40.6 mm |
| May | 14.1 °C | 58.2 mm |
| June | 12.0 °C | 66.7 mm |
| July | 11.1 °C · coldest | 71.1 mm · wettest |
| August | 11.5 °C | 64.2 mm |
| September | 13.0 °C | 59.0 mm |
| October | 14.9 °C | 38.7 mm |
| November | 17.1 °C | 33.5 mm |
| December | 18.9 °C | 28.0 mm |
How to read these numbers
These are reanalysis normals, not readings from a single weather station. They come from the ERA5 0.25° (~25 km) global reanalysis grid, sampled at the grid cell nearest Adelaide — centred at 35.00°S, 138.50°E. A reanalysis blends observations with a physics model onto an even grid, so a coastal or mountain city's cell can read a little cooler, warmer, wetter or drier than the city centre itself. The month-to-month shape — when it's hot, when it rains — is what these normals capture best.
“Normal” means the 1991–2020 average, the current World Meteorological Organization standard period. A normal is what a place tends toward over decades — any single day, month or year can and will depart from it.