Tallinn weather in September
Temperature, sea and sunshine in September: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in September
Good
Best time to visit: June – August
What is the weather like in Tallinn in September?
In September, Tallinn is cool: daytime highs average 15 °C, and nights cool down to about 11 °C. The sea averages 15.0 °C – swimming is only for the hardy. Expect around 5 hours of sunshine a day. Rain is frequent, with about 11 rainy days and 59 mm in total. All in all, September is a good month for a holiday in Tallinn.
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 77 | 60 | 16 |
| Day | 20° | 15° | 9° |
| Night | 15° | 11° | 6° |
| Sea | 18° | 15° | 11° |
| Sun | 8 h | 5 h | 3 h |
| Rain days | 13 | 11 | 13 |
More details for September
- Daylight
- 12 h 59 min06:47 – 19:46
- UV index
- 2 · lowclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 21 km/haverage daily peakAll months
- Cloud cover
- 65 %on averageAll months
- Hot days
- 0 days30 °C or more
- Snow days
- 0 days1 cm or more of fresh snowAll months
- Time zone
- UTC+3Europe/Tallinn
How the score comes together
- Temperatureweight 50 %74 %
- Sunshineweight 20 %40 %
- Few rainy daysweight 30 %49 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in September
- A jumper for the evenings
- Rain jacket or umbrella
Tallinn in September: quick answers
Is Tallinn hot in September?
No. In September, Tallinn is cool: daytime highs average 15 °C and nights drop to about 11 °C.
Can you swim in Tallinn in September?
Only if you don't mind cold water: in September the sea averages just 15.0 °C. Comfortable swimming temperatures are not reached at any time of year.
Does it rain much in Tallinn in September?
Rain is frequent, with about 11 rainy days and 59 mm in total.
Tallinn month by month
The whole year in TallinnAll destinations: EstoniaWhere to go in SeptemberSea temperature in September
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences