Click on a day for an hourly weather forecast
The temperatures in Trier in September are usually low and can range between 10°C and 19°C.
You can expect about 3 to 8 days of rain in Trier 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 Trier in September 2025.
If you’re planning to visit Trier in the near future, we highly recommend that you review the 14 day weather forecast for Trier before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 3° / -2° | 10 | 11 | 11 | 106 mm | Awful | Trier in January |
| February | 5° / -1° | 9 | 10 | 9 | 88 mm | Awful | Trier in February |
| March | 9° / 1° | 8 | 19 | 4 | 75 mm | Awful | Trier in March |
| April | 14° / 4° | 5 | 23 | 1 | 70 mm | Good | Trier in April |
| May | 17° / 7° | 8 | 23 | 0 | 119 mm | Ok | Trier in May |
| June | 21° / 11° | 7 | 23 | 0 | 107 mm | Ok | Trier in June |
| July | 23° / 13° | 5 | 26 | 0 | 74 mm | Perfect | Trier in July |
| August | 23° / 13° | 4 | 27 | 0 | 62 mm | Perfect | Trier in August |
| September | 19° / 10° | 4 | 26 | 0 | 61 mm | Good | Trier in September |
| October | 13° / 6° | 7 | 24 | 0 | 81 mm | Bad | Trier in October |
| November | 8° / 3° | 9 | 18 | 2 | 100 mm | Awful | Trier in November |
| December | 4° / 0° | 12 | 12 | 8 | 137 mm | Awful | Trier in December |