Diani Beach (Diani) weather in December
December in Diani Beach: sweltering, a little rain, with clean air — fine if you can take 36°C afternoons.
Updated September 2026 · climate normals from ERA5 reanalysis
#7 of 12 months in Diani Beach · #205 of 1413 destinations to visit in December · comfort 87/100 (tier A)
- Days
- 31°C
- Nights
- 25°C
- Wet days
- 15
- Sun
- 11.2 h
- Humidity
- 78%
- Daylight
- 12 h
Traveller notes on Diani Beach in December
Other months in Diani Beach
Diani Beach's forum is split on July: some posters call this some of the coast's best weather, with days in the high 20s C and nights around 22C, while others describe a genuinely messier stretch of mostly cloudy skies and sharp showers with just a couple of sunny hours to work with. Humidity stays high regardless of which pattern you get. The consistent good news is the sea clears up for snorkeling and diving by July, and several posters noted Kenya's weather has gotten less predictable year to year, so it's worth going in with flexible expectations either way.
Forum posters name January and February as the hottest months here, but also the driest - averaging around 5 rainy days a month, the lowest rainfall stretch of the year by posters' count. Sea temperatures in January are reported around 27-28C, genuinely warm for swimming, though posters flag a practical local quirk: low tide (timing varies day to day, sometimes morning, sometimes afternoon) can pull the water back far enough to make swimming impractical for a stretch of any given day regardless of season. Posters generally rate the whole year as good here except for the wetter May-June stretch and a possible rainy patch around September-October, positioning January squarely within the best overall window.
Add your own note from Diani Beach's card on the map.
Diani Beach climate normals — December
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Diani Beach in December
How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.
Peak crowdsKaskazi, the high season, Festive season peak, school holidays in 5 of the markets that fill it(estimated)
Peak crowdsBusyShoulder seasonQuiet
Best months for Diani Beach's weather
Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).
Fair weatherDiani Beach's best weather comes in January, February and August — separate windows, not one continuous season.
Best weatherFair weatherToughest weather
What's on in Diani Beach in December
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Season
Kaskazi, the high season
10 Dec – 20 Mar · usuallyWind seasonCrowdedThe north-easterly brings the warm, clear, flat months: the best water on the reef, the steadiest kite conditions, and the fullest hotels of the year. Book Christmas and New Year long in advance. Source ↗
- Holiday
Festive season peak
18 Dec – 5 JanChristmas & New YearCrowdedBook earlyChristmas to New Year is the busiest fortnight on the coast: Kenyan families and holidaymakers from Nairobi arrive, hotels charge peak rates and book out months ahead, and beaches and restaurants are at their most crowded. New Year's Eve parties run late. Source ↗
Nearby, and something's on
Within 300 km of Diani Beach — a day trip or a short hop — with something on this month. Never part of the comfort score.
Where is Diani Beach?
Diani Beach in December — FAQ
- Is December a good time to visit Diani Beach?
- December in Diani Beach: sweltering, a little rain, with clean air — fine if you can take 36°C afternoons. It ranks #7 of 12 months for Diani Beach on SeasonMap's comfort score (87/100).
- What is the weather like in Diani Beach in December?
- In December, Diani Beach averages a daily high of 31.2°C and a low of 24.9°C, with about 65.9 mm of rain over roughly 15.1 rainy days.
- What is the air quality in Diani Beach in December?
- Diani Beach has a mean US Air Quality Index of about 44 in December.
Within 300 km: Mombasa's Whale sharks off the coast around 1 Dec – 31 Mar, and Lamu's Lamu Cultural Festival around 27 Nov – 4 Dec.