Click on a day for an hourly weather forecast
The weather in Geilo in September is very cold with temperatures between 1°C and 10°C, warm clothes are a must.
You can expect about 3 to 8 days of rain in Geilo 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.
You can expect a few days of snow in Geilo during September. It’s important to get out your snow boots and warm mittens to stay warm while you explore Geilo.
Our weather forecast can give you a great sense of what weather to expect in Geilo in September 2026.
If you’re planning to visit Geilo in the near future, we highly recommend that you review the 14 day weather forecast for Geilo before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -8° / -14° | 6 | 6 | 21 | 69 mm | Awful | Geilo in January |
| February | -6° / -14° | 5 | 5 | 20 | 52 mm | Awful | Geilo in February |
| March | -3° / -11° | 7 | 7 | 19 | 54 mm | Awful | Geilo in March |
| April | 1° / -8° | 5 | 10 | 16 | 43 mm | Awful | Geilo in April |
| May | 6° / -2° | 7 | 13 | 11 | 71 mm | Awful | Geilo in May |
| June | 13° / 3° | 7 | 21 | 1 | 100 mm | Bad | Geilo in June |
| July | 16° / 5° | 9 | 22 | 0 | 114 mm | Ok | Geilo in July |
| August | 14° / 4° | 9 | 22 | 0 | 115 mm | Ok | Geilo in August |
| September | 10° / 1° | 7 | 20 | 3 | 94 mm | Awful | Geilo in September |
| October | 3° / -3° | 8 | 8 | 15 | 91 mm | Awful | Geilo in October |
| November | -2° / -8° | 6 | 5 | 20 | 80 mm | Awful | Geilo in November |
| December | -7° / -12° | 7 | 4 | 22 | 80 mm | Awful | Geilo in December |