Devonport's weather can be unpredictable, with the warmest month being February with average high temperature being 21.8°C and the coldest month is July, which its average highest temperature being 12.8°C.
| Month | Mean Max Temp (°C) | Mean Min Temp (°C) | Mean Rain Fall (mm) |
|---|---|---|---|
| January | 21.6 | 12.4 | 42.5 |
| February | 21.8 | 12.7 | 37.3 |
| March | 20.5 | 11.0 | 48.7 |
| April | 17.8 | 8.8 | 59.5 |
| May | 15.4 | 6.8 | 74.2 |
| June | 15.4 | 6.8 | 74.2 |
| July | 12.8 | 4.7 | 95.9 |
| August | 13.1 | 5.0 | 88.7 |
| September | 14.3 | 6.1 | 73.4 |
| October | 16.0 | 7.4 | 62.9 |
| November | 18.0 | 9.3 | 56.0 |
| December | 19.8 | 10.7 | 52.1 |
| Annual | 17.0 | 8.3 | 763.6 |
