Bali weather in September
Bali averages 28°C by day and 23°C at night in September, with the sea at 28°C and about 97 mm of rain in the month.
Day
28°C
Night
23°C
Sea
28°C
Rain
97 mm
Flight from London
15h
What September feels like
September is hot in Bali: proper beach weather.
The sea is warm at 28°C: comfortable for long swims.
Expect some rainy spells: about 97 mm falls in the month.
That is 8°C warmer than an average September day in London.
Of the 56 sun destinations we track, Bali is the #36 warmest in September.
Going to Bali in September?
Share the TikToks and Instagram Reels you've saved for Bali to Dream Trip. It finds the places, pins them on a map and builds your days around them.
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.
| Month | Day | Night | Sea | Rain |
|---|---|---|---|---|
| January | 29°C | 24°C | 29°C | 320 mm |
| February | 29°C | 24°C | 30°C | 333 mm |
| March | 29°C | 24°C | 30°C | 233 mm |
| April | 29°C | 24°C | 30°C | 153 mm |
| May | 29°C | 25°C | 29°C | 131 mm |
| June | 28°C | 24°C | 29°C | 109 mm |
| July | 27°C | 23°C | 28°C | 90 mm |
| August | 27°C | 23°C | 27°C | 60 mm |
| September | 28°C | 23°C | 28°C | 97 mm |
| October | 29°C | 24°C | 29°C | 115 mm |
| November | 30°C | 24°C | 30°C | 225 mm |
| December | 29°C | 24°C | 30°C | 282 mm |
Bali in September: quick answers
Is Bali hot in September?
September is hot in Bali: proper beach weather. 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?
Expect some rainy spells: about 97 mm falls in the month.
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. 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 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.
