Click on a day for an hourly weather forecast
The temperatures in Riverton in September are comfortable with low of 12°C and and high up to 27°C.
You can expect about 3 to 8 days of rain in Riverton 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 Riverton in September 2025.
If you’re planning to visit Riverton in the near future, we highly recommend that you review the 14 day weather forecast for Riverton before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 2° / -8° | 9 | 17 | 5 | 42 mm | Awful | Riverton in January |
| February | 4° / -6° | 8 | 17 | 4 | 35 mm | Awful | Riverton in February |
| March | 9° / -2° | 7 | 20 | 5 | 55 mm | Awful | Riverton in March |
| April | 13° / 2° | 8 | 19 | 2 | 67 mm | Awful | Riverton in April |
| May | 20° / 6° | 8 | 23 | 0 | 61 mm | Ok | Riverton in May |
| June | 27° / 12° | 4 | 26 | 0 | 27 mm | Perfect | Riverton in June |
| July | 33° / 17° | 4 | 27 | 0 | 11 mm | Good | Riverton in July |
| August | 31° / 16° | 4 | 27 | 0 | 20 mm | Good | Riverton in August |
| September | 27° / 12° | 5 | 25 | 0 | 38 mm | Perfect | Riverton in September |
| October | 17° / 5° | 4 | 26 | 1 | 39 mm | Good | Riverton in October |
| November | 9° / -2° | 5 | 21 | 3 | 35 mm | Bad | Riverton in November |
| December | 2° / -8° | 10 | 16 | 5 | 53 mm | Awful | Riverton in December |