Click on a day for an hourly weather forecast
The temperatures in Flam in September are quite cold with temperatures between 5°C and 14°C, warm clothes are a must.
You can expect rain for roughly half of the month of September in Flam. We’re expecting roughly 8 to 15 days of rain, so your rubber boots and umbrella are going to see plenty of use this month if you’re keen on staying dry.
Our weather forecast can give you a great sense of what weather to expect in Flam in September 2025.
If you’re planning to visit Flam in the near future, we highly recommend that you review the 14 day weather forecast for Flam before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -3° / -10° | 5 | 9 | 17 | 118 mm | Awful | Flam in January |
| February | -2° / -10° | 5 | 7 | 18 | 105 mm | Awful | Flam in February |
| March | 2° / -7° | 6 | 10 | 15 | 93 mm | Awful | Flam in March |
| April | 7° / -2° | 5 | 18 | 7 | 64 mm | Bad | Flam in April |
| May | 13° / 3° | 8 | 21 | 2 | 126 mm | Awful | Flam in May |
| June | 18° / 7° | 8 | 22 | 0 | 136 mm | Ok | Flam in June |
| July | 20° / 9° | 10 | 21 | 0 | 162 mm | Ok | Flam in July |
| August | 18° / 7° | 9 | 22 | 0 | 167 mm | Ok | Flam in August |
| September | 14° / 5° | 8 | 22 | 0 | 154 mm | Ok | Flam in September |
| October | 8° / 0° | 10 | 18 | 3 | 168 mm | Awful | Flam in October |
| November | 2° / -4° | 10 | 9 | 11 | 158 mm | Awful | Flam in November |
| December | -2° / -8° | 8 | 7 | 16 | 145 mm | Awful | Flam in December |