Click on a day for an hourly weather forecast
The temperatures in Chatham in September are usually low and can range between 11°C and 18°C.
You can expect about 3 to 8 days of rain in Chatham 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 Chatham in September 2025.
If you’re planning to visit Chatham in the near future, we highly recommend that you review the 14 day weather forecast for Chatham before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 7° / 3° | 9 | 20 | 3 | 97 mm | Awful | Chatham in January |
| February | 8° / 4° | 8 | 18 | 2 | 88 mm | Awful | Chatham in February |
| March | 10° / 4° | 7 | 23 | 1 | 70 mm | Bad | Chatham in March |
| April | 12° / 5° | 5 | 25 | 0 | 51 mm | Ok | Chatham in April |
| May | 15° / 8° | 6 | 25 | 0 | 83 mm | Good | Chatham in May |
| June | 17° / 11° | 6 | 24 | 0 | 87 mm | Good | Chatham in June |
| July | 19° / 13° | 6 | 25 | 0 | 90 mm | Good | Chatham in July |
| August | 19° / 13° | 7 | 24 | 0 | 103 mm | Ok | Chatham in August |
| September | 18° / 11° | 5 | 25 | 0 | 67 mm | Good | Chatham in September |
| October | 14° / 10° | 8 | 23 | 0 | 110 mm | Ok | Chatham in October |
| November | 11° / 7° | 8 | 21 | 0 | 119 mm | Bad | Chatham in November |
| December | 8° / 5° | 8 | 21 | 1 | 114 mm | Bad | Chatham in December |