Click on a day for an hourly weather forecast
The weather in Plano in September is hot. The average temperatures are between 21°C and 31°C.
You can expect about 3 to 8 days of rain in Plano 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 Plano in September 2025.
If you’re planning to visit Plano in the near future, we highly recommend that you review the 14 day weather forecast for Plano before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 12° / 4° | 3 | 28 | 1 | 52 mm | Ok | Plano in January |
| February | 13° / 5° | 4 | 23 | 2 | 59 mm | Bad | Plano in February |
| March | 19° / 10° | 5 | 26 | 0 | 87 mm | Good | Plano in March |
| April | 23° / 13° | 4 | 26 | 0 | 79 mm | Perfect | Plano in April |
| May | 27° / 17° | 7 | 24 | 0 | 154 mm | Good | Plano in May |
| June | 32° / 22° | 7 | 23 | 0 | 115 mm | Ok | Plano in June |
| July | 34° / 24° | 7 | 24 | 0 | 101 mm | Bad | Plano in July |
| August | 35° / 24° | 5 | 26 | 0 | 114 mm | Ok | Plano in August |
| September | 31° / 21° | 6 | 24 | 0 | 135 mm | Good | Plano in September |
| October | 25° / 15° | 5 | 26 | 0 | 128 mm | Perfect | Plano in October |
| November | 18° / 9° | 3 | 26 | 0 | 78 mm | Good | Plano in November |
| December | 13° / 6° | 4 | 27 | 0 | 77 mm | Ok | Plano in December |