Click on a day for an hourly weather forecast
The temperatures in Old Saybrook in September are comfortable with low of 15°C and and high up to 23°C.
You can expect about 3 to 8 days of rain in Old Saybrook during the month of September. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.
Our weather forecast can give you a great sense of what weather to expect in Old Saybrook in September 2025.
If you’re planning to visit Old Saybrook in the near future, we highly recommend that you review the 14 day weather forecast for Old Saybrook before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 3° / -4° | 7 | 21 | 3 | 96 mm | Awful | Old Saybrook in January |
| February | 4° / -3° | 8 | 17 | 3 | 97 mm | Awful | Old Saybrook in February |
| March | 7° / 0° | 8 | 21 | 2 | 114 mm | Awful | Old Saybrook in March |
| April | 13° / 5° | 8 | 22 | 0 | 109 mm | Bad | Old Saybrook in April |
| May | 19° / 10° | 8 | 23 | 0 | 102 mm | Ok | Old Saybrook in May |
| June | 23° / 15° | 8 | 22 | 0 | 113 mm | Good | Old Saybrook in June |
| July | 27° / 19° | 9 | 22 | 0 | 124 mm | Good | Old Saybrook in July |
| August | 27° / 19° | 9 | 22 | 0 | 122 mm | Good | Old Saybrook in August |
| September | 23° / 15° | 6 | 24 | 0 | 105 mm | Perfect | Old Saybrook in September |
| October | 17° / 10° | 8 | 23 | 0 | 142 mm | Ok | Old Saybrook in October |
| November | 11° / 4° | 6 | 23 | 0 | 100 mm | Ok | Old Saybrook in November |
| December | 6° / 0° | 8 | 21 | 2 | 133 mm | Awful | Old Saybrook in December |