Sydney weather in August
Sydney averages 18°C by day and 9°C at night in August, with the sea at 18°C and about 69 mm of rain in the month. It warms up by about 3°C into September.
Day
18°C
Night
9°C
Sea
18°C
Rain
69 mm
Flight from London
20½h
What August feels like
August is mild in Sydney: good for exploring, not reliably beach weather.
The sea is 18°C: refreshing, and chilly for most people after a few minutes.
Rain is occasional: about 69 mm in the month.
That is 4°C cooler than an average August day in London.
Of the 56 sun destinations we track, Sydney is the #55 warmest in August.
Going to Sydney in August?
Share the TikToks and Instagram Reels you've saved for Sydney to Dream Trip. It finds the places, pins them on a map and builds your days around them.
Want it warmer in August?
These are hotter than Sydney this month for at most an hour and a half more flying:
Sydney weather by month
August is highlighted. Compare with July and September, or see the full year in Sydney.
Sydney in August: quick answers
Is Sydney hot in August?
August is mild in Sydney: good for exploring, not reliably beach weather. Average highs are 18°C and lows 9°C.
Can you swim in Sydney in August?
The sea is 18°C: refreshing, and chilly for most people after a few minutes.
Does it rain in Sydney in August?
Rain is occasional: about 69 mm in the month.
What is the warmest month in Sydney?
January, at an average high of 27°C. The coolest is June at 17°C.
How long is the flight to Sydney from the UK?
About 20½h direct from London, estimated from the 17,016 km distance. Check your airline for exact times.
Still choosing? See where is hot in August for every destination ranked by temperature, sea and flight time.
How we measured this
Averages of every day in August from 2016 to 2025, from the Open-Meteo historical weather archive (ECMWF ERA5 reanalysis). Sea temperature is the 2023 to 2025 average from the Open-Meteo marine archive. Rain is the average monthly total. Reanalysis describes an area about 25 km across, so sheltered resorts can run a degree or two warmer. Flight time is a distance-based estimate from London Heathrow.
Planning Sydney in August?
Save the restaurants, beaches and views you find on TikTok and Instagram for Sydney straight to a map, then let Dream Trip turn them into a day-by-day plan.
