Click on a day for an hourly weather forecast
The temperatures in Newmarket in September are comfortable with low of 12°C and and high up to 21°C.
You can expect about 3 to 8 days of rain in Newmarket 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 Newmarket in September 2025.
If you’re planning to visit Newmarket in the near future, we highly recommend that you review the 14 day weather forecast for Newmarket before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -3° / -11° | 8 | 18 | 4 | 21 mm | Awful | Newmarket in January |
| February | -2° / -10° | 8 | 15 | 5 | 20 mm | Awful | Newmarket in February |
| March | 3° / -5° | 7 | 20 | 4 | 24 mm | Awful | Newmarket in March |
| April | 10° / 1° | 8 | 20 | 2 | 34 mm | Bad | Newmarket in April |
| May | 18° / 8° | 7 | 24 | 0 | 33 mm | Good | Newmarket in May |
| June | 22° / 13° | 7 | 23 | 0 | 41 mm | Good | Newmarket in June |
| July | 25° / 16° | 8 | 23 | 0 | 38 mm | Perfect | Newmarket in July |
| August | 25° / 16° | 7 | 24 | 0 | 34 mm | Perfect | Newmarket in August |
| September | 21° / 12° | 6 | 24 | 0 | 29 mm | Good | Newmarket in September |
| October | 13° / 6° | 8 | 23 | 0 | 35 mm | Ok | Newmarket in October |
| November | 6° / 0° | 7 | 22 | 1 | 20 mm | Bad | Newmarket in November |
| December | 0° / -5° | 9 | 18 | 4 | 21 mm | Awful | Newmarket in December |