| Station | Record length | Seasonal Trends | |||||
| To | Short rains (SON) | Intermediate season (DJF) | Long rains (MAM) | Dry season (JJA) | ANN | ||
| Julius Nyerere Int. airport | 1980 | 2009 | −0.642 | −1.032 | −0.469 | −2.232 | −2.045 |
| Kisarawe Met. station | 1980 | 2009 | −1.784 | −1.219 | −0.994 | −1.895 | −2.007 |