Click on a day for an hourly weather forecast
The temperatures in Jamestown in September are comfortable with low of 12°C and and high up to 21°C.
You can expect rain for roughly half of the month of September in Jamestown. 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 Jamestown in September 2025.
If you’re planning to visit Jamestown in the near future, we highly recommend that you review the 14 day weather forecast for Jamestown before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -2° / -8° | 17 | 7 | 7 | 93 mm | Awful | Jamestown in January |
| February | 0° / -8° | 14 | 7 | 7 | 88 mm | Awful | Jamestown in February |
| March | 5° / -4° | 12 | 15 | 5 | 94 mm | Awful | Jamestown in March |
| April | 11° / 2° | 13 | 14 | 3 | 118 mm | Awful | Jamestown in April |
| May | 18° / 8° | 12 | 19 | 0 | 126 mm | Ok | Jamestown in May |
| June | 22° / 13° | 11 | 19 | 0 | 158 mm | Ok | Jamestown in June |
| July | 24° / 16° | 12 | 20 | 0 | 143 mm | Good | Jamestown in July |
| August | 24° / 15° | 11 | 20 | 0 | 123 mm | Good | Jamestown in August |
| September | 21° / 12° | 9 | 21 | 0 | 112 mm | Ok | Jamestown in September |
| October | 14° / 7° | 11 | 19 | 0 | 143 mm | Ok | Jamestown in October |
| November | 7° / 0° | 12 | 14 | 5 | 108 mm | Awful | Jamestown in November |
| December | 2° / -4° | 16 | 8 | 7 | 118 mm | Awful | Jamestown in December |