Since it’s just below the equator, the only discernible seasons are dry and wet. The tropical climate in the major dive areas means you’ll rarely see air temperatures drop below 20ºC/68ºF and easily soaring to 35-38ºC/95-100ºF in Dar-es-Salaam. Running from good to excellent throughout Tanzania’s Indian Ocean sites, visibility can reach 30 metres/100 feet.