Sydney weather in January
Sydney averages 27°C by day and 20°C at night in January, with the sea at 22°C and about 107 mm of rain in the month.
Day
27°C
Night
20°C
Sea
22°C
Rain
107 mm
Flight from London
20½h
What January feels like
January is hot in Sydney: proper beach weather.
The sea is 22°C: fine for swimming without a wetsuit.
Expect some rainy spells: about 107 mm falls in the month.
That is 19°C warmer than an average January day in London.
Of the 56 sun destinations we track, Sydney is the #22 warmest in January.
Going to Sydney in January?
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 January?
These are hotter than Sydney this month for at most an hour and a half more flying:
Sydney weather by month
January is highlighted. Compare with December and February, or see the full year in Sydney.
Sydney in January: quick answers
Is Sydney hot in January?
January is hot in Sydney: proper beach weather. Average highs are 27°C and lows 20°C.
Can you swim in Sydney in January?
The sea is 22°C: fine for swimming without a wetsuit.
Does it rain in Sydney in January?
Expect some rainy spells: about 107 mm falls 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 January for every destination ranked by temperature, sea and flight time.
How we measured this
Averages of every day in January 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 January?
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.
