Click on a day for an hourly weather forecast
The temperatures in Gardermoen in September are quite cold with temperatures between 7°C and 15°C, warm clothes are a must.
You can expect about 3 to 8 days of rain in Gardermoen 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 Gardermoen in September 2026.
If you’re planning to visit Gardermoen in the near future, we highly recommend that you review the 14 day weather forecast for Gardermoen before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -4° / -8° | 3 | 11 | 17 | 67 mm | Awful | Gardermoen in January |
| February | -2° / -8° | 2 | 10 | 16 | 65 mm | Awful | Gardermoen in February |
| March | 2° / -5° | 4 | 13 | 14 | 65 mm | Awful | Gardermoen in March |
| April | 8° / 1° | 6 | 17 | 8 | 60 mm | Bad | Gardermoen in April |
| May | 14° / 5° | 9 | 19 | 2 | 136 mm | Bad | Gardermoen in May |
| June | 18° / 9° | 8 | 21 | 0 | 138 mm | Ok | Gardermoen in June |
| July | 20° / 11° | 10 | 21 | 0 | 164 mm | Ok | Gardermoen in July |
| August | 18° / 11° | 10 | 21 | 0 | 161 mm | Ok | Gardermoen in August |
| September | 15° / 7° | 7 | 23 | 0 | 128 mm | Ok | Gardermoen in September |
| October | 8° / 3° | 10 | 17 | 4 | 132 mm | Awful | Gardermoen in October |
| November | 2° / -1° | 8 | 13 | 9 | 126 mm | Awful | Gardermoen in November |
| December | -2° / -5° | 6 | 9 | 17 | 91 mm | Awful | Gardermoen in December |