Weather in Adelaide

On this site the months that score closest to a 22°C day, lighter rain, and moderate humidity are December, January, and February. Adelaide is in Australia at 34.9°S. The 2001–2020 NASA POWER daily record describes a humid subtropical climate.

January is the warmest month (average 22.9°C, high 29.9°C) and July is the coolest (average 10.3°C, low 6.4°C). Rain is wet season runs from May to August, inside an annual total of 430 mm. The wettest month is July at 60 mm; the driest is January at 15 mm.

When the score favours a visit

The three months with the highest comfort score are December, January, and February: December (20.6°C average, 23 mm, 53% humidity); January (22.9°C average, 15 mm, 51% humidity); February (22.4°C average, 17 mm, 54% humidity). Those months sit across the year end, so they are listed in season order rather than January-to-December. The score rewards averages near 22°C, lower rainfall, and humidity near 60%. It is a climate score, not a festival or price calendar.

If you want the wet season itself — fewer crowds, greener landscape, heavier rain — aim at May–August instead of the score.

Hot and cool months in Adelaide

Adelaide has a 12.6°C gap between its coolest monthly average (10.3°C in July) and its warmest (22.9°C in January). That is a southern-hemisphere pattern.

Across the year the mean afternoon high is 21.8°C. If you want the smallest day–night shock, look at months where the high and low sit close together; January nights still hold 15.8°C.

When Adelaide gets wet

The wet season in Adelaide starts in May and ends in August (May, June, July, and August). July is the core of it at 60 mm. January is the other extreme, with 15 mm.

Humidity peaks near 80%. That usually lines up with the wetter months rather than the hottest ones.

The calendar in Adelaide

Peak heat arrives in January: 29.9°C by day, 15.8°C at night, and 51% humidity. In April, Adelaide averages 22.7°C by day and 11.9°C at night, with 34 mm of rain.

The wet season opens in May. Expect 53 mm and 10 rainy days, with nights around 9.6°C. The year bottoms out in July. Plan for 6.4°C at night and 14.1°C in the afternoon.

Adelaide and other cities in Australia

Melbourne is about 654 km away: Adelaide is 2.5°C warmer than Melbourne in its hottest month and 285 mm drier over the year than Melbourne. Melbourne’s wettest month is November (74 mm) versus July here.

Sydney is about 1162 km away: Adelaide is about as warm as Sydney at the hot peak and 458 mm drier over the year than Sydney. Sydney’s wettest month is February (135 mm) versus July here.

Brisbane is about 1601 km away: Adelaide is 2.9°C cooler than Brisbane in its hottest month and 670 mm drier over the year than Brisbane. Brisbane’s wettest month is February (156 mm) versus July here.