Sydney weather in January
Sydney averages 27°C by day and 20°C at night in January, with the sea at 22°C and 14 days with at least 1 mm of rain.
Day
27°C
Night
20°C
Sea
22°C
Rainy days
14
Flight from London
20½h
What January feels like
January is hot but wet in Sydney: rainy season, so pack for showers.
The sea is 22°C: fine for swimming without a wetsuit.
It is rainy season, with rain on about 14 days.
Of the 48 sun destinations we track, Sydney is the #19 warmest in January.
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 but wet in Sydney: rainy season, so pack for showers. 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?
It is rainy season, with rain on about 14 days.
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. A rainy day has at least 1 mm of rain. 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?
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