Bali weather in September
Bali averages 28°C by day and 23°C at night in September, with the sea at 28°C and 19 days with at least 1 mm of rain.
Day
28°C
Night
23°C
Sea
28°C
Rainy days
19
Flight from London
15h
What September feels like
September is hot but wet in Bali: rainy season, so pack for showers.
The sea is warm at 28°C: comfortable for long swims.
It is rainy season, with rain on about 19 days.
Of the 48 sun destinations we track, Bali is the #29 warmest in September.
Want it warmer in September?
These are hotter than Bali this month for at most an hour and a half more flying:
Bali weather by month
September is highlighted. Compare with August and October, or see the full year in Bali.
Bali in September: quick answers
Is Bali hot in September?
September is hot but wet in Bali: rainy season, so pack for showers. Average highs are 28°C and lows 23°C.
Can you swim in Bali in September?
The sea is warm at 28°C: comfortable for long swims.
Does it rain in Bali in September?
It is rainy season, with rain on about 19 days.
What is the warmest month in Bali?
November, at an average high of 30°C. The coolest is July at 27°C.
How long is the flight to Bali from the UK?
About 15h direct from London, estimated from the 12,522 km distance. Check your airline for exact times.
Still choosing? See where is hot in September for every destination ranked by temperature, sea and flight time.
How we measured this
Averages of every day in September 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 Bali in September?
Save the restaurants, beaches and views you find on TikTok and Instagram for Bali straight to a map, then let Dream Trip turn them into a day-by-day plan.
