Adelaide is 1.8°C (3.2°F) warmer by day, Perth has 6.6°C (11.9°F) warmer nights, Perth gets 242 mm (9.5 in) more rain a year.
Adelaide is at its warmest in January and coolest in July, while Perth peaks in January and bottoms out in August. Month for month, Perth is the warmer of the two in 11 of 12 months.
Perth is the wetter of the two, collecting 695 mm (27.4 in) of rain a year against 453 mm (17.8 in) in Adelaide. The most comfortable time to visit is March, April and November in Adelaide and April, May and November in Perth.
| Adelaide | Metric | Perth |
|---|---|---|
| 🌡️ Temperature | ||
| 29.6°C | 🌡️Average daytime high | 27.8°C |
| 6.4°C | 🌙Average nighttime low | 13°C |
| January | 🔥Hottest month | January |
| July | ❄️Coldest month | August |
| 🌧️ Rain | ||
| 453 mm | 🌧️Annual rainfall | 695 mm |
| July | ☔Wettest month | July |
| February | 🏜️Driest month | December |
| 💨 Climate | ||
| 65% | 💧Average humidity | 69% |
| 2.8 m/s | 💨Average wind speed | 5.2 m/s |
Overnight, Adelaide typically falls to around 6.4°C (43.5°F) while Perth settles near 13°C (55.4°F).
Adelaide is hottest in January and coldest in July, whereas Perth peaks in January and is coolest in August.
Adelaide sees the most rain in July and the least in February; Perth is wettest in July and driest in December.
Perth feels the more humid of the two, averaging 69% relative humidity against 65%.
For Perth, the pick of the year is April, May and November.
Month by month, here is the coldest night, the average day and the hottest afternoon each city can expect. Switch Compare to read rainfall, humidity, wind or solar instead, and Period to move between the long-term 45-year average and any single year — the shading is a quick warm-to-cool guide.
| Month | Adelaide | Perth | ||||
|---|---|---|---|---|---|---|
| Min | Avg | Max | Min | Avg | Max | |
| January | 11 | 25.6🔥 | 40.1 | 15.9 | 25.3 | 34.7 |
| February | 11 | 24.8 | 38.6 | 16.3 | 25.4🔥 | 34.5 |
| March | 9.4 | 22.5 | 35.6 | 15.6 | 24.4 | 33.2 |
| April | 7.2 | 18.7 | 30.2 | 14.3 | 21.7 | 29.1 |
| May | 4.7 | 14.4 | 24.1 | 12.9 | 19 | 25.1 |
| June | 2.8 | 11.1 | 19.3 | 11.2 | 16.6 | 22.1 |
| July | 2.1 | 10.1❄️ | 18.1 | 10.4 | 15.5❄️ | 20.6 |
| August | 2.7 | 11.9 | 21 | 10 | 15.5 | 20.9 |
| September | 3.8 | 14.8 | 25.7 | 10.4 | 16.7 | 23 |
| October | 5.2 | 17.8 | 30.4 | 11.3 | 19 | 26.8 |
| November | 7.1 | 21 | 34.9 | 12.9 | 21.7 | 30.5 |
| December | 9.2 | 23.4 | 37.6 | 14.6 | 24 | 33.4 |
| Annual Avg | 6.4 | 18 | 29.6 | 13 | 20.4 | 27.8 |
Min / mean / max temperature (°C). 🔥 marks each city's hottest month, ❄️ its coldest; shading runs cool blue to warm red.
The same figures plotted out, so the shape of a typical year is easier to see than in a grid. Where the two lines run close together Adelaide and Perth feel alike; where they separate, they are genuinely different places to be.
Hover or tap any point to read the exact figures. Adelaide Perth
See how Adelaide and Perth stack up against other cities. Swipe for more.
Choose which city to keep, then search for any other city in our database — we'll build the comparison for you.
Quick answers to the questions people ask most when comparing Adelaide and Perth — each drawn straight from the climate figures above.
Adelaide is the warmer of the two. It averages daytime highs of 29.6°C (85.3°F) against 27.8°C (82°F) in Perth — roughly 1.8°C (3.2°F) warmer by day. Nights are milder in Perth, with average lows of 13°C (55.4°F) versus 6.4°C (43.5°F).
Adelaide is hottest in January, averaging highs of about 40.1°C (104.2°F), while Perth peaks in January at around 34.7°C (94.5°F). That makes Adelaide the hotter of the two at the height of summer.
Adelaide gets colder. In its coldest month (July) overnight lows average about 2.1°C (35.8°F), compared with 10°C (50°F) at the low point of the year in Perth.
Perth is the wetter city, collecting about 695 mm (27.4 in) of rain a year versus 453 mm (17.8 in) in Adelaide. Adelaide is wettest in July and driest in February; Perth is wettest in July and driest in December.
Perth is the more humid of the two, averaging 69% relative humidity over the year against 65% in Adelaide.
The most comfortable months in Adelaide are March, April and November, when average temperatures are at their mildest.
Perth is at its most pleasant around April, May and November, based on the mildest average temperatures of the year.
Perth is the warmer city in 11 of the 12 months of the year. The gap is widest in June, about 5.5°C (9.9°F), and narrowest in January, about 0.3°C (0.5°F).
Adelaide has the bigger seasonal swing, about 15.5°C (27.9°F) between its coldest and hottest months versus 9.9°C (17.8°F) in Perth — so Perth has the steadier, more even climate.
On climate alone, Adelaide comes out ahead — it offers warmer days, less rain and lower humidity than Perth. Perth is the better fit only if you'd actually prefer cooler weather, more rainfall and a more humid climate.
Every figure on this page is calculated from NASA POWER satellite climate data spanning 1981–2025 (45 years). The averages describe the long-term climate of Adelaide and Perth, not a single year's weather or a short-range forecast.
