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Zanzibar weather by month
Historical averages 2016–2025 · not a forecast
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When is the best time to visit Zanzibar?
For a warm holiday, the best week has been 31 July – 6 August (Weather Index 98). Favourable start dates for a 7-day trip run from 24 June to 22 September. March is warmest (31°C), July is driest and December has the most sun.
- Warmest
- March 31°C
- Coolest
- May to September 28°C
- Driest
- July 21% rain-day chance
- Wettest
- April 90% rain-day chance
- Sunniest
- December 12 hours a day
A rain day has 1 mm or more, snow included, so a short shower counts. Monthly averages below give the amounts.
Monthly averages in Zanzibar
Zanzibar historical monthly estimates, 2016–2025. Temperatures and sunshine are daily averages.
| Month | High (°C) | Low (°C) | Rain-day chance (%) | Expected rain days | Precipitation (mm/month) | Sunshine (hours/day) |
|---|---|---|---|---|---|---|
| January | 30.0 | 26.8 | 41.9 | 13.0 | 57.1 | 11.3 |
| February | 30.5 | 26.9 | 32.9 | 9.2 | 35.5 | 11.3 |
| March | 30.6 | 26.6 | 57.7 | 17.9 | 119.3 | 10.6 |
| April | 28.9 | 25.4 | 90.3 | 27.1 | 317.0 | 8.2 |
| May | 28.4 | 24.7 | 55.5 | 17.2 | 144.4 | 9.5 |
| June | 28.0 | 23.8 | 31.7 | 9.5 | 37.8 | 10.6 |
| July | 27.6 | 23.1 | 21.0 | 6.5 | 22.9 | 10.8 |
| August | 27.8 | 23.0 | 30.0 | 9.3 | 22.6 | 11.0 |
| September | 28.3 | 23.3 | 22.3 | 6.7 | 21.9 | 11.5 |
| October | 29.0 | 24.3 | 34.2 | 10.6 | 65.1 | 11.4 |
| November | 29.6 | 25.4 | 60.7 | 18.2 | 107.8 | 11.5 |
| December | 30.0 | 26.3 | 68.7 | 21.3 | 106.2 | 11.6 |
Each month averages its own days. Precipitation includes snow. About the data
Sources
Open-Meteo · 1 Jan 2016 – 31 Dec 2025
- Open-Meteo Historical Weather API
- Local days, 2016–2025, every year weighted equally. Each weekly chart averages its own seven days, without smoothing.
- Shading shows the 10th–90th percentile of past days, not forecast confidence.
- A rain day has at least 1 mm, snow included. The last weekly period has eight days.
- Wind is the average daytime (10:00–18:00) maximum, not gusts. Daylight is calculated from latitude. Missing readings stay blank.
- Mugginess (dew point) comes from the original daily summaries, on UTC days.
- The live two-week forecast comes from the Open-Meteo Weather Forecast API. The Weather Index does not use it.