Click on a day for an hourly weather forecast
The temperatures in Tallinn in September are usually low and can range between 10°C and 16°C.
You can expect about 3 to 8 days of rain in Tallinn 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 Tallinn in September 2025.
If you’re planning to visit Tallinn in the near future, we highly recommend that you review the 14 day weather forecast for Tallinn before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -2° / -5° | 7 | 5 | 22 | 83 mm | Awful | Tallinn in January |
| February | -2° / -5° | 6 | 3 | 21 | 71 mm | Awful | Tallinn in February |
| March | 1° / -3° | 10 | 5 | 19 | 67 mm | Awful | Tallinn in March |
| April | 7° / 1° | 7 | 15 | 8 | 60 mm | Awful | Tallinn in April |
| May | 13° / 6° | 6 | 24 | 1 | 77 mm | Ok | Tallinn in May |
| June | 18° / 11° | 7 | 23 | 0 | 114 mm | Ok | Tallinn in June |
| July | 21° / 14° | 8 | 23 | 0 | 131 mm | Ok | Tallinn in July |
| August | 20° / 14° | 8 | 23 | 0 | 139 mm | Ok | Tallinn in August |
| September | 16° / 10° | 7 | 23 | 0 | 106 mm | Ok | Tallinn in September |
| October | 9° / 5° | 10 | 18 | 4 | 108 mm | Awful | Tallinn in October |
| November | 5° / 2° | 10 | 12 | 8 | 93 mm | Awful | Tallinn in November |
| December | 1° / -2° | 9 | 5 | 20 | 91 mm | Awful | Tallinn in December |