Click on a day for an hourly weather forecast
The weather in Norwalk in September is hot. The average temperatures are between 20°C and 27°C.
As it is almost never rain during September in Norwalk the weather is perfect for hanging out outside and exploring all that Norwalk has to offer.
Our weather forecast can give you a great sense of what weather to expect in Norwalk in September 2025.
If you’re planning to visit Norwalk in the near future, we highly recommend that you review the 14 day weather forecast for Norwalk before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 20° / 12° | 2 | 29 | 0 | 26 mm | Good | Norwalk in January |
| February | 19° / 12° | 2 | 27 | 0 | 24 mm | Good | Norwalk in February |
| March | 20° / 13° | 1 | 30 | 0 | 15 mm | Good | Norwalk in March |
| April | 21° / 14° | 0 | 30 | 0 | 7 mm | Good | Norwalk in April |
| May | 21° / 15° | 0 | 31 | 0 | 4 mm | Good | Norwalk in May |
| June | 23° / 17° | 0 | 30 | 0 | 2 mm | Perfect | Norwalk in June |
| July | 26° / 19° | 0 | 31 | 0 | 8 mm | Perfect | Norwalk in July |
| August | 27° / 20° | 0 | 31 | 0 | 6 mm | Perfect | Norwalk in August |
| September | 27° / 20° | 0 | 30 | 0 | 6 mm | Perfect | Norwalk in September |
| October | 25° / 18° | 1 | 30 | 0 | 9 mm | Perfect | Norwalk in October |
| November | 22° / 15° | 1 | 29 | 0 | 11 mm | Good | Norwalk in November |
| December | 19° / 12° | 2 | 29 | 0 | 28 mm | Good | Norwalk in December |