Sydney’s subtropical climate delivers warm summers, mild winters, and more than 300 sunny days annually. The city’s coastal position moderates temperatures, while its famous harbour creates microclimates where one suburb can be drenched while another basks in sunshine. This month-by-month guide breaks down Sydney’s weather in detail.
Sydney Climate Overview
Sydney has a humid subtropical climate (Cfa) with warm, sometimes hot summers and mild, pleasant winters. Average annual temperature is 18 degrees Celsius (64 Fahrenheit). January is the hottest month averaging 26 Celsius (79 Fahrenheit); July is the coolest at 16 Celsius (61 Fahrenheit).
Annual rainfall totals about 1,200 millimetres (47 inches), distributed fairly evenly throughout the year with a slight summer peak. The sea temperature ranges from 18 Celsius (64 Fahrenheit) in winter to 23 Celsius (73 Fahrenheit) in summer. Sydney’s weather is famously changeable; a sunny morning can transform into a stormy afternoon in summer, and winter days can swing from crisp and clear to grey and drizzly.
Summer (December to February)
Sydney summers are warm to hot with average highs of 26 to 27 Celsius (79 to 81 Fahrenheit). Heatwaves can push temperatures above 40 Celsius (104 Fahrenheit), particularly in January. Afternoon thunderstorms are common, sometimes severe. The sea is warm at 22 to 23 Celsius (72 to 73 Fahrenheit).
This is peak tourist season, with school holidays from mid-December through late January driving up prices. Christmas on the beach is a uniquely Sydney experience. New Year’s Eve fireworks over the Harbour Bridge are world-famous; book vantage points months ahead. Pack summer clothes, swimwear, and sun protection (the Australian sun is intense).
Autumn (March to May)
Autumn is Sydney’s most pleasant season. March averages 25 Celsius (77 Fahrenheit), cooling to 20 Celsius (68 Fahrenheit) by May. Rainfall is moderate and humidity drops significantly. The sea remains swimmable through April. The tourist crowds thin after March, making this an excellent season for sightseeing. The city’s parks and the Royal Botanic Garden are particularly beautiful in April and May. This is the best season for hiking in the Blue Mountains. Pack layers and a light rain jacket.
Winter (June to August)
Sydney winters are mild with average highs of 17 to 18 Celsius (63 to 64 Fahrenheit) and lows around 8 Celsius (46 Fahrenheit). Rain falls on about 10 to 12 days per month. The sea cools to 18 Celsius (64 Fahrenheit), still swimmable for the hardy. This is low season for tourism with the best hotel rates of the year. Vivid Sydney, a spectacular light festival, transforms the city in late May and June. Pack layers including a warm jacket for evenings. The Blue Mountains can see occasional light snow.
Spring (September to November)
Spring warms steadily from 20 Celsius (68 Fahrenheit) in September to 24 Celsius (75 Fahrenheit) in November. Rainfall is moderate and jacaranda trees explode in purple bloom, particularly around the Harbour and in Paddington. October and November are festival-heavy months. Tourism increases through the season but remains below summer peaks. Pack layers and sun protection; UV levels climb rapidly in spring.
