Diani Beach weather in September
Diani Beach averages 27°C by day and 23°C at night in September, with the sea at 27°C and about 85 mm of rain in the month.
Day
27°C
Night
23°C
Sea
27°C
Rain
85 mm
Flight from London
9h
What September feels like
September is hot in Diani Beach: proper beach weather.
The sea is warm at 27°C: comfortable for long swims.
Expect some rainy spells: about 85 mm falls in the month.
That is 7°C warmer than an average September day in London.
Of the 56 sun destinations we track, Diani Beach is the #45 warmest in September.
Going to Diani Beach in September?
Share the TikToks and Instagram Reels you've saved for Diani Beach 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 Diani Beach this month for at most an hour and a half more flying:
Diani Beach weather by month
September is highlighted. Compare with August and October, or see the full year in Diani Beach.
| Month | Day | Night | Sea | Rain |
|---|---|---|---|---|
| January | 31°C | 25°C | 28°C | 47 mm |
| February | 31°C | 25°C | 29°C | 27 mm |
| March | 31°C | 25°C | 30°C | 77 mm |
| April | 29°C | 25°C | 29°C | 237 mm |
| May | 28°C | 24°C | 28°C | 270 mm |
| June | 27°C | 23°C | 28°C | 118 mm |
| July | 26°C | 22°C | 27°C | 90 mm |
| August | 26°C | 22°C | 26°C | 72 mm |
| September | 27°C | 23°C | 27°C | 85 mm |
| October | 28°C | 23°C | 27°C | 142 mm |
| November | 29°C | 24°C | 28°C | 108 mm |
| December | 30°C | 25°C | 29°C | 102 mm |
Diani Beach in September: quick answers
Is Diani Beach hot in September?
September is hot in Diani Beach: proper beach weather. Average highs are 27°C and lows 23°C.
Can you swim in Diani Beach in September?
The sea is warm at 27°C: comfortable for long swims.
Does it rain in Diani Beach in September?
Expect some rainy spells: about 85 mm falls in the month.
What is the warmest month in Diani Beach?
February, at an average high of 31°C. The coolest is July at 26°C.
How long is the flight to Diani Beach from the UK?
About 9h direct from London, estimated from the 7,266 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 Diani Beach in September?
Save the restaurants, beaches and views you find on TikTok and Instagram for Diani Beach straight to a map, then let Dream Trip turn them into a day-by-day plan.
