Stone Town, Tanzania: vitamin D, best months and travel guide
UNESCO old town of carved doors, markets and the spice trade. Best for: culture travellers, couples.
The best months for vitamin D in Stone Town are January, February, May, July, August, when a full dose takes about 6 minutes at midday. Rainy or stormy from March to April and in June and from September to December.
Stone Town month by month
| Month | Rating | Sun window | Peak UV | Full dose, age 30 | Afternoon high | Rainy days |
|---|---|---|---|---|---|---|
| January | Excellent | 7.6 h | 8.0 | 7 min | 32°C | 14/30 |
| February | Excellent | 8.4 h | 8.6 | 6 min | 33°C | 15/30 |
| March | Bad weather | 7.8 h | 8.3 | 6 min | 32°C | 20/30 |
| April | Bad weather | 6.8 h | 7.2 | 7 min | 28°C | 26/30 |
| May | Excellent | 7.5 h | 7.4 | 7 min | 29°C | 17/30 |
| June | Bad weather | 7.3 h | 7.1 | 8 min | 28°C | 19/30 |
| July | Excellent | 7.6 h | 7.4 | 7 min | 27°C | 14/30 |
| August | Excellent | 8.0 h | 8.0 | 7 min | 28°C | 17/30 |
| September | Bad weather | 8.2 h | 8.2 | 7 min | 29°C | 19/30 |
| October | Bad weather | 8.4 h | 8.3 | 6 min | 30°C | 21/30 |
| November | Bad weather | 8.2 h | 8.1 | 7 min | 29°C | 26/30 |
| December | Bad weather | 8.5 h | 8.5 | 6 min | 30°C | 22/30 |
Sun window is the number of hours a day with UV Index 2.5 or higher. Full dose is the minutes at midday for about 1,000 IU of vitamin D with a quarter of the body bare, for skin type III. Rainy days are days with at least 1 mm out of 30.
What to expect in Stone Town
UNESCO old town of carved doors, markets and the spice trade. Hot and humid coast, two rainy seasons (long rains April to May, short rains November). Beaches have strong tides at some sites. Dress modestly in Stone Town.
In Stone Town afternoon highs average from 27°C in July to 33°C in February. The wettest month is April (about 26 rainy days out of 30) and the driest is July (14). Midday UV peaks at 8.6 in February, which is very strong, so protect your skin.
The old centre of Zanzibar city, a maze of narrow lanes, carved doors, markets and spice shops with Swahili, Arab and Indian influence. It is a culture stop, with the best beaches an hour away on the north and east coasts.
More about Tanzania · Tanzania in February · Best places in February
Questions about Stone Town
When is the best time to visit Stone Town for vitamin D?
The best months for vitamin D in Stone Town are January, February, May, July, August, when a full dose takes about 6 minutes at midday.
What is the weather like in Stone Town?
Afternoon highs average from 27°C in July to 33°C in February. The wettest month is April, with about 26 rainy days out of 30.
Which months should I avoid in Stone Town?
For a beach stay, avoid the months when it is rainy or stormy from March to April and in June and from September to December.