Climate averages 1991–2020
Tallinn weather
in September.
A mild, moderately wet month: the 4th warmest and the 8th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a mild month in Tallinn: daytime highs average 15.3°C and nights cool to about 9.9°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 60 mm of rain on roughly 12 days, which makes September a moderately wet month (the 8th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 56 min on an average September day.
The nearest other city in this atlas is Helsinki (82 km away). In September its highs average 14.6°C, 0.7°C cooler than Tallinn, with 57 mm of rain.
Among the 2 cities listed in Estonia, Tallinn ranks 2nd of 2 for the warmest September highs and 2nd of 2 for the driest September (rainfall, lowest first). The mean September high of those 2 cities is 15.3°C; Tallinn is level with that mean.
From September to October, average highs fall by 6.5°C to 8.8°C, and monthly rainfall rises from 60 mm to 64 mm.
The annual picture
September in context
Monthly precipitation
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Tallinn climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | -1.5°C-5.4°C | -5.4°C | 43 | 10.7 | 6.97 h |
| February | -1.9°C-6.4°C | -6.4°C | 35 | 9.3 | 9.29 h |
| March | 1.9°C-3.8°C | -3.8°C | 33 | 8.4 | 11.812 h |
| April | 8.7°C0.9°C | 0.9°C | 36 | 8.6 | 14.514 h |
| May | 14.6°C6.1°C | 6.1°C | 41 | 8.6 | 17.017 h |
| June | 18.6°C11.0°C | 11.0°C | 70 | 11.3 | 18.519 h |
| July | 21.5°C14.5°C | 14.5°C | 68 | 11.8 | 17.818 h |
| August | 20.3°C13.8°C | 13.8°C | 77 | 12.9 | 15.616 h |
| September, selected | 15.3°C9.9°C | 9.9°C | 60 | 11.7 | 12.913 h |
| October | 8.8°C4.7°C | 4.7°C | 64 | 12.5 | 10.310 h |
| November | 3.6°C0.5°C | 0.5°C | 51 | 11.0 | 7.78 h |
| December | 0.5°C-2.9°C | -2.9°C | 48 | 11.2 | 6.26 h |
Precipitation (rain or snow, as water) is the average of the 30 separate monthly totals. A wet day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- Helsinki in SeptemberFinland · 82 kmHigh 14.6°C · Low 9.8°C · 57 mm rain
- Espoo in SeptemberFinland · 86 kmHigh 14.5°C · Low 10.0°C · 55 mm rain
- Vantaa in SeptemberFinland · 97 kmHigh 14.9°C · Low 9.0°C · 57 mm rain
- Tartu in SeptemberEstonia · 163 kmHigh 15.4°C · Low 9.3°C · 50 mm rain
- Turku in SeptemberFinland · 179 kmHigh 15.0°C · Low 8.8°C · 58 mm rain
- Lahti in SeptemberFinland · 179 kmHigh 14.1°C · Low 8.5°C · 51 mm rain
- Kouvola in SeptemberFinland · 192 kmHigh 14.2°C · Low 8.4°C · 53 mm rain
- Tampere in SeptemberFinland · 235 kmHigh 13.5°C · Low 8.8°C · 53 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Tallinn) is explained once on the Tallinn year overview and on the Sources, method and limits page.