Click on a day for an hourly weather forecast
The weather in Port St. Lucie in September is very hot. The average temperatures are between 26°C and 30°C, drinking water regularly is advisable.
You can expect rain for roughly half of the month of September in Port St. Lucie. We’re expecting roughly 8 to 15 days of rain, so your rubber boots and umbrella are going to see plenty of use this month if you’re keen on staying dry.
Our weather forecast can give you a great sense of what weather to expect in Port St. Lucie in September 2025.
If you’re planning to visit Port St. Lucie in the near future, we highly recommend that you review the 14 day weather forecast for Port St. Lucie before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 22° / 17° | 2 | 29 | 0 | 37 mm | Good | Port St. Lucie in January |
| February | 23° / 18° | 2 | 26 | 0 | 36 mm | Perfect | Port St. Lucie in February |
| March | 24° / 19° | 2 | 29 | 0 | 43 mm | Perfect | Port St. Lucie in March |
| April | 26° / 21° | 4 | 26 | 0 | 59 mm | Perfect | Port St. Lucie in April |
| May | 28° / 23° | 7 | 24 | 0 | 127 mm | Good | Port St. Lucie in May |
| June | 30° / 25° | 12 | 18 | 0 | 167 mm | Ok | Port St. Lucie in June |
| July | 30° / 26° | 14 | 17 | 0 | 182 mm | Ok | Port St. Lucie in July |
| August | 31° / 26° | 14 | 17 | 0 | 220 mm | Ok | Port St. Lucie in August |
| September | 30° / 26° | 11 | 19 | 0 | 177 mm | Ok | Port St. Lucie in September |
| October | 28° / 24° | 4 | 27 | 0 | 101 mm | Perfect | Port St. Lucie in October |
| November | 25° / 21° | 2 | 28 | 0 | 65 mm | Perfect | Port St. Lucie in November |
| December | 24° / 19° | 2 | 29 | 0 | 44 mm | Perfect | Port St. Lucie in December |