Click on a day for an hourly weather forecast
The temperatures in Bellevue in September are comfortable with low of 11°C and and high up to 22°C.
You can expect about 3 to 8 days of rain in Bellevue 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 Bellevue in September 2025.
If you’re planning to visit Bellevue in the near future, we highly recommend that you review the 14 day weather forecast for Bellevue before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 8° / 2° | 12 | 17 | 2 | 122 mm | Awful | Bellevue in January |
| February | 8° / 2° | 9 | 15 | 4 | 86 mm | Awful | Bellevue in February |
| March | 11° / 3° | 10 | 20 | 2 | 93 mm | Awful | Bellevue in March |
| April | 14° / 5° | 7 | 23 | 0 | 73 mm | Ok | Bellevue in April |
| May | 19° / 7° | 4 | 27 | 0 | 49 mm | Good | Bellevue in May |
| June | 22° / 9° | 3 | 27 | 0 | 38 mm | Good | Bellevue in June |
| July | 26° / 12° | 1 | 30 | 0 | 14 mm | Perfect | Bellevue in July |
| August | 26° / 13° | 2 | 29 | 0 | 20 mm | Perfect | Bellevue in August |
| September | 22° / 11° | 3 | 27 | 0 | 47 mm | Good | Bellevue in September |
| October | 16° / 7° | 8 | 23 | 0 | 93 mm | Ok | Bellevue in October |
| November | 10° / 4° | 11 | 19 | 1 | 108 mm | Bad | Bellevue in November |
| December | 7° / 1° | 9 | 19 | 3 | 108 mm | Awful | Bellevue in December |