Click on a day for an hourly weather forecast
The temperatures in Saint Peter during September are extremely high, between 28°C and hot as 29°C, drinking water regularly is advisable.
You can expect rain for roughly half of the month of September in Saint Peter. 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 Saint Peter in September 2025.
If you’re planning to visit Saint Peter in the near future, we highly recommend that you review the 14 day weather forecast for Saint Peter before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 27° / 26° | 2 | 29 | 0 | 48 mm | Perfect | Saint Peter in January |
| February | 27° / 25° | 1 | 27 | 0 | 36 mm | Perfect | Saint Peter in February |
| March | 27° / 26° | 1 | 30 | 0 | 47 mm | Perfect | Saint Peter in March |
| April | 27° / 26° | 3 | 27 | 0 | 68 mm | Perfect | Saint Peter in April |
| May | 28° / 27° | 4 | 27 | 0 | 102 mm | Perfect | Saint Peter in May |
| June | 28° / 27° | 6 | 24 | 0 | 150 mm | Perfect | Saint Peter in June |
| July | 28° / 27° | 10 | 21 | 0 | 196 mm | Good | Saint Peter in July |
| August | 29° / 28° | 11 | 20 | 0 | 277 mm | Ok | Saint Peter in August |
| September | 29° / 28° | 10 | 20 | 0 | 216 mm | Ok | Saint Peter in September |
| October | 29° / 28° | 10 | 21 | 0 | 231 mm | Ok | Saint Peter in October |
| November | 28° / 27° | 7 | 23 | 0 | 161 mm | Good | Saint Peter in November |
| December | 28° / 27° | 2 | 29 | 0 | 66 mm | Perfect | Saint Peter in December |