Weather in Tallinn in September 2025
Average weather
Average temperature in Tallinn in September
The expected average maximum temperature in September is +19°C with a maximum of +23°C and a minimum of +6°C.
The average maximum temperature goes down 18% by the end of the month, compared with the beginning of the month, from +19°C to +16°C.
Is Tallinn warm or cold in September?
Tallinn is typically mild in September.
Maximum temperatures go down compared to the previous month from +20°C to +15°C. The minimum temperature also goes down from +12°C to +9°C.
Pack a light jacket as it will be warm in the day and cool in the evenings.
Take a look at how September is compared to other months in Tallinn:
Water temperature in Tallinn in September
Water in Tallinn in September is Cold. It varies from +12°C to +19°C, with an average of +16°C. Note that the air temperature is lower than the water temperature, averaging around +15°C.
The water temperature in September is one of the warmest of the entire year:
Can you swim in Tallinn in September?
Climate in Tallinn in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +20°C | +15°C | +9°C | ||||
| Min. temperature | ||||||
| +4°C | -2°C | -9°C | ||||
| Max. temperature | ||||||
| +32°C | +27°C | +20°C | ||||
| Rainfall | ||||||
| 86 mm | 59 mm | 55 mm | ||||
| Wind | ||||||
| 2 m/s | 3 m/s | 3 m/s | ||||
| Avg. water temperature | ||||||
| +19°C | +16°C | +11°C | ||||
| Humidity | ||||||
| 79% | 82% | 84% | ||||
| Air pressure | ||||||
| 1011 HPa | 1012 HPa | 1012 HPa | ||||
| Sunny days | ||||||
| 5 | 4 | 2 | ||||
| Cloudy days | ||||||
| 6 | 8 | 11 | ||||
| Rainy days | ||||||
| 18 | 17 | 16 | ||||
| Snowy days | ||||||
| 0 | 0 | 1 | ||||
September weather is still as ok as in August. It’s getting colder in September. From +20°C in the day, the average maximum temperature lowers to +15°C. As September arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 86 mm to 59 mm. Humidity rises from 79% to 82%. Winds are stronger in comparison to August, going up from 2 m/s to 3 m/s on average. The days becoming less sunny, going from 5 sunny days in August to 4 in September.
October brings much the same weather, it remains ok.
Wind
The average wind speed is 3 m/s getting up to 6 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in Tallinn is gradually increasing during September, going from 3 m/s to 5 m/s over the course of the month.
Rain
How was the weather last September in Tallinn?
Climate Change over Years
The climate in Tallinn in September has not changed much over the last 43 years.
The average temperature was the lowest in 1987 (+6°C) and the highest in 2020 (+11°C). The driest year was 2018 with only 182 mm of rainfall, and the wettest year was 2016 with 848 mm.
FAQ
Is September a good time to visit Tallinn?
Can you sunbathe in Tallinn in September?
Can you swim in Tallinn in September?
Is Tallinn rainy in September?
Is it sunny in Tallinn in September?
Monthly weather in Tallinn
Source of the data
For this page, we’ve looked at the typical weather in Tallinn, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.