Weather in Sydney

Sydney is in Australia at 33.9°S. The 2001–2020 NASA POWER daily record describes a mild oceanic climate. January is the warmest month (average 23.2°C, high 25.9°C) and July is the coolest (average 14.1°C, low 11.7°C).

Rain is wet season runs from February to March, inside an annual total of 888 mm. The wettest month is February at 135 mm; the driest is September at 43 mm. On this site the months that score closest to a 22°C day, lighter rain, and moderate humidity are February, March, and December.

When the score favours a visit

The three months with the highest comfort score are February, March, and December: February (23.0°C average, 135 mm, 77% humidity); March (22.0°C average, 105 mm, 75% humidity); December (21.7°C average, 72 mm, 73% humidity). They fall in calendar order. 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 February–March instead of the score.

How warm Sydney gets

Sydney has a 9.1°C gap between its coolest monthly average (14.1°C in July) and its warmest (23.2°C in January). That is a southern-hemisphere pattern.

Across the year the mean afternoon high is 21.4°C. If you want the smallest day–night shock, look at months where the high and low sit close together; January nights still hold 20.5°C.

When Sydney gets wet

The wet season in Sydney starts in February and ends in March (February and March). February is the core of it at 135 mm. September is the other extreme, with 43 mm.

Humidity peaks near 77%. That usually lines up with the wetter months rather than the hottest ones.

What stands out month by month

Peak heat arrives in January: 25.9°C by day, 20.5°C at night, and 75% humidity. February is when the wet season typically starts in Sydney: highs near 25.2°C, and rainfall jumps to 135 mm (13 rainy days).

The year bottoms out in July. Plan for 11.7°C at night and 16.6°C in the afternoon. September is the driest month, averaging only 43 mm across 7 rainy days. Highs sit near 19.7°C.

Sydney and other cities in Australia

Melbourne is about 713 km away: Sydney is 2.8°C warmer than Melbourne in its hottest month and 173 mm wetter over the year than Melbourne. Melbourne’s wettest month is November (74 mm) versus February here.

Brisbane is about 733 km away: Sydney is 2.6°C cooler than Brisbane in its hottest month and 212 mm drier over the year than Brisbane. Brisbane’s wettest month is February (156 mm) versus February here.

Adelaide is about 1162 km away: Sydney is about as warm as Adelaide at the hot peak and 458 mm wetter over the year than Adelaide. Adelaide’s wettest month is July (60 mm) versus February here.