September Weather in Tallinn, Estonia

Last updated: August 21, 2025

September weather in Tallinn, Estonia presents a blend of mild temperatures and enchanting autumnal charm. With maximum highs reaching up to 24°C (75°F) and average temperatures around 13°C (55°F), visitors can enjoy comfortable days as summer transitions to fall. However, the days can start cool, with minimum temperatures dipping to 3°C (37°F). Rainfall is also a feature of this month, with 78 mm (3.1 in) of precipitation spread over 15 days, contributing to the lush greenery of the city. Coupled with a high humidity level of 87%, September in Tallinn is marked by a refreshing yet damp atmosphere, perfect for exploring the city's rich history and vibrant culture.

September Temperature in Tallinn

In September, Tallinn, Estonia begins to transition from the warmth of summer into the cooler embrace of autumn. With temperatures ranging from a minimum of 3°C (37°F) to a comfortable maximum of 24°C (75°F), this month strikes a harmonious balance, offering an average temperature of 13°C (55°F). The lingering warmth from August still lingers, allowing for pleasant days, yet as the month progresses, the days grow shorter and the air invites light sweaters and cozy layers. September’s mild climate provides a picturesque backdrop for exploring the medieval charm of Tallinn, making it an ideal time for both local festivities and outdoor adventures before the chill of October sets in.

September Weather in Tallinn: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Tallinn, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Tallinn, September typically has an average temperature of {2}°C ({3}°F), with highs reaching up to {4}°C ({5}°F) and lows dropping to around {6}°C ({7}°F).
JanFebMarAprMayJunJulAugSepOctNovDec302833404960646255474032
Data source: Temperature data for Tallinn generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Tallinn

September in Tallinn, Estonia, marks a notable transition as the summer warmth gives way to the crispness of autumn. With 78 mm (3.1 in) of precipitation spread over 15 days, this month experiences a significant amount of rain, though less than the preceding July and August. The increase in precipitation days suggests more frequent, albeit lighter, showers as the city prepares for the wetter months ahead. This trend continues into October, which sees a jump in both rainfall and rainy days, reinforcing the idea that September serves as a bridge between the vibrant summer and the more persistent autumnal rains. As the landscape begins to shift with the changing seasons, September delivers a blend of cool breezes and refreshing showers, signaling the onset of fall in this charming Baltic city.

September Precipitation Trends in Tallinn

The chart displays monthly precipitation patterns in Tallinn, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Tallinn, September typically receives around {2} mm ({3} inches) of precipitation spread over approximately {4} days.
JanFebMarAprMayJunJulAugSepOctNovDec44484742545568102781005860
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Tallinn

In Tallinn, Estonia, September marks a transition as summer fades into autumn, with humidity levels averaging 87%. This reflects a slight uptick from the drier summer months of May through August, which hover around 76% to 83%. Notably, the humidity begins to rise again, reminiscent of the wetter early months of the year, such as January and February with their high levels of 92% and 91% respectively. September's humidity, while still moderate, sets the stage for the coming months where the air becomes increasingly moist, culminating in the more humid climates of late autumn and winter. This gentle shift signifies not only a change in season but also prepares residents and visitors alike for the crispness of fall that lies ahead.

September Average Humidity in Tallinn

This chart illustrates the average monthly humidity levels in Tallinn, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Tallinn is approximately {2}%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec92%91%90%87%76%80%80%83%87%90%91%90%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Tallinn

As summer transitions to autumn, September in Tallinn sees a UV Index of 4, categorizing exposure as moderate with a burn time of 30 minutes. This slight dip from August's peak of 5 reflects the waning strength of the sun, as the city begins to cool down. Despite the summer highs of 7 in June and July, September offers opportunities to enjoy the outdoors while still being mindful of sun safety. As the days get shorter and the sun’s intensity gradually decreases, ensure to stay protected during your outdoor activities. For more details on UV levels throughout the year, check out the Tallinn UV Index.

Maximum UV Index Levels in Tallinn for September

The chart shows the monthly maximum UV Index (UVI) for Tallinn in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Tallinn typically reaches {2}, which falls under the {3} exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec113457754211
Data source: Tallinn September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

September Sunshine in Tallinn

As September rolls in, Tallinn basks in 303 hours of sunshine, a delightful conclusion to the vibrant summer months. Following the peak of May and June, where nearly 450 hours of sunlight invigorate the city, September presents a gentle decline, but still offers plenty of bright days to enjoy. The trend is clear: after the sunniest stretch, the daylight begins to taper off, leading into the cooler months. With October's 206 hours on the horizon, locals and visitors alike seize the moment to explore the charming streets and picturesque views of Estonia's capital before the winter chill sets in. The warm glow of early autumn makes September a truly enchanting time to experience Tallinn.

Monthly Sunshine Duration in Tallinn: September Highlighted

The September sunshine duration represents the total number of hours Tallinn experiences direct sunlight during the month of September, excluding cloudy or obstructed periods. This chart compares the sunshine duration of September with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec61h157h268h367h452h488h481h408h303h206h121h64h
Data source: Tallinn September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Tallinn During September

In Tallinn, Estonia, the likelihood of sunny weather experiences a notable shift throughout the year. After the summer months, where July holds a peak with a 58% chance of sunshine, September sees a drop to 28%. This decline foreshadows the onset of autumn, as the days grow shorter and cloud cover increases. Notably, September's sunshine probability surpasses the chillier months ahead, such as October and November, which hover around 22% and 21%, respectively. Thus, while September may not bask in the same warmth as summer, it still offers a relatively decent opportunity for those seeking sunny days before the colder weather sets in.

Percentage of Sunny Days in September in Tallinn

The chart illustrates the percentage of sunny days in Tallinn throughout the year, with September highlighted. It highlights the variation in sunshine across each month and provides an overview of the typical frequency of sunny days, offering insights into how often Tallinn experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec5%15%35%43%33%55%58%33%28%22%21%13%
Data source: Tallinn September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Tallinn in September

As summer gracefully transitions to autumn in Tallinn, September offers a delightful balance of daylight, with the sun gracing the city for approximately 12 hours each day. This marks a gentle decline from the vibrant 15 hours of sunlight in August, signaling the gradual approach of shorter days. The trend showcases the enduring influence of the summer months, as daylight reaches its peak in June with 18 hours, before steadily diminishing into the cooler months. Despite this reduction, the golden hues of early autumn still invite long strolls through parks and along the picturesque waterfront, allowing residents and visitors alike to savor the lingering warmth of summer before the depth of winter sets in.

Average Daylight Hours in Tallinn for September

The chart illustrates the variation in daylight duration in Tallinn throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec6h 55m9h 12m11h 51m14h 34m17h 4m18h 31m17h 44m15h 25m12h 46m10h 6m7h 35m6h 8m
Data source: Tallinn daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Tallinn

As September rolls into Tallinn, the winds whisper tales of change, bringing an average speed of 5.0 m/s (11 mph). This steady breeze mirrors the patterns of summer's end, where the air begins to invigorate with a crispness hinting at autumn. Interestingly, September's winds hold steady with those of August, suggesting a gentle transition rather than an abrupt shift. However, looking ahead, one can sense the winds will soon pick up, as October is forecasted to bring stronger gusts averaging 6.1 m/s (14 mph). This subtle increase captures the essence of Tallinn’s dynamic climate, reminding us of the evolving dance between seasons, where each gust carries a fresh promise of the beauty that lies ahead.

Average September Wind Speed in Tallinn

The chart displays monthly wind speed patterns in Tallinn, with values for each month shown alongside September's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how September's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec4.54.45.54.94.23.33.95.05.0 m/s6.15.65.0
Data source: Tallinn September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Tallinn Compares to Other Months

Weather in Tallinn varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Tallinn, focusing on differences in temperature, rainfall, humidity, and UV levels.

September and January present stark contrasts in weather. September experiences milder temperatures, ranging from a minimum of 3°C (37°F) to a maximum of 24°C (75°F), with an average of 13°C (55°F). The month also sees about 78 mm (3.1 in) of rainfall over 15 days, accompanied by high humidity levels at 87%. In contrast, January is much colder, with temperatures plummeting to a minimum of -16°C (3°F) and only reaching a maximum of 8°C (46°F), resulting in an average temperature of -1°C (30°F). The precipitation in January is less pronounced at 44 mm (1.7 in) over 11 days, but the humidity is slightly higher at 92%. For more detailed information about January weather, you can visit Tallinn weather in January.

In September, the weather is relatively mild, with temperatures ranging from a minimum of 3°C (37°F) to a maximum of 24°C (75°F) and an average of 13°C (55°F). The month experiences considerable rainfall, totaling 78 mm (3.1 in) over about 15 days, accompanied by a high humidity level of 87%. In contrast, February brings much colder conditions, where temperatures can drop to as low as -21°C (-6°F), peaking at just 7°C (44°F), with an average temperature of -2°C (28°F). Despite having less precipitation (48 mm or 1.9 in), February features a slightly increased number of rainy days (11) and higher humidity at 91%. For more detailed information on February weather, you can check Tallinn weather in February.

September and March present striking contrasts in weather. In September, temperatures range from a mild 3°C (37°F) at their lowest to a pleasant average of 13°C (55°F), peaking at 24°C (75°F). The month experiences about 78 mm (3.1 in) of precipitation over 15 days, with humidity levels at 87%. In comparison, March is much colder, with temperatures dipping to a minimum of -18°C (0°F) and only averaging 0°C (33°F), reaching a high of 10°C (51°F). This month sees less precipitation at 47 mm (1.9 in) but over 13 days, with slightly higher humidity at 90%. For more details, check out Tallinn weather in March.

September and April present distinct weather contrasts in terms of temperature and precipitation. In September, temperatures range from a minimum of 3°C (37°F) to a comfortable maximum of 24°C (75°F), with an average of 13°C (55°F). This month sees a higher precipitation level of 78 mm (3.1 in) across about 15 days, accompanied by persistent humidity at 87%. In contrast, April experiences a cooler climate, with temperatures dipping as low as -8°C (18°F) and peaking at 18°C (65°F), averaging only 4°C (40°F). The month features less rainfall, totaling 41 mm (1.6 in) over roughly 10 days, while humidity remains constant at 87%. For more insights into the weather during this time, check out Tallinn weather in April.

When comparing the weather in September and May, notable differences emerge in temperature, precipitation, and humidity. September experiences a cooler average temperature, ranging from a minimum of 3°C (37°F) to a comfortable maximum of 24°C (75°F), with an average of 13°C (55°F). In contrast, May begins with lower temperatures, dipping to a minimum of -2°C (29°F), yet it can also reach up to 24°C (75°F), with an average of 10°C (50°F). Precipitation is more frequent in September, averaging 78 mm (3.1 in) over 15 days, while May sees less rainfall at 54 mm (2.1 in) over 9 days. Additionally, September has higher humidity at 87%, compared to May's 76%. These variations make each month distinct in terms of weather conditions. For more specific information, you can check out Tallinn weather in May.

When comparing the weather in September and June, it's clear that June tends to be warmer and drier. June boasts an average temperature of 16°C (60°F), with highs reaching up to 30°C (87°F), while September's average temperature is cooler at 13°C (55°F), peaking at 24°C (75°F). Additionally, June receives less rainfall, totaling 55 mm (2.2 in) over just 9 days, compared to September's 78 mm (3.1 in) spread across 15 days. Humidity levels also differ slightly, with September being more humid at 87%, compared to June's 80%. For more detailed information, you can check Tallinn weather in June.

In comparing the weather between September and July, September tends to be cooler with average temperatures ranging from a minimum of 3°C (37°F) to a maximum of 24°C (75°F), while July boasts warmer averages, featuring a minimum of 9°C (48°F) and a maximum of 30°C (86°F). Additionally, September experiences higher humidity at 87% compared to July's 80%. Precipitation is also slightly higher in September, totaling 78 mm (3.1 in) over 15 days, whereas July sees 68 mm (2.7 in) over just 11 days. For more detailed insights on July's weather, visit Tallinn weather in July.

In comparing the weather between September and August, it's clear that September experiences cooler temperatures, with a minimum of 3°C (37°F) and a maximum of 24°C (75°F), compared to August's warmer range of 8°C (47°F) to 29°C (84°F). The average temperature in September is 13°C (55°F), which is significantly lower than August's average of 17°C (63°F). Additionally, September sees more precipitation with 78 mm (3.1 in) over 15 days, though August also has a notable amount of rain at 102 mm (4.0 in) across the same number of days. Humidity levels are slightly higher in September at 87%, compared to August’s 83%. For more details on August weather, check Tallinn weather in August.

September and October exhibit a notable shift in weather patterns. September enjoys milder temperatures, with averages around 13°C (55°F) and maximums reaching 24°C (75°F), while October sees a drop in average temperature to 8°C (47°F) and maximums peaking at just 17°C (64°F). Precipitation increases from 78 mm (3.1 in) over 15 days in September to 100 mm (3.9 in) across 17 days in October, indicating a wetter month ahead. Additionally, humidity rises slightly, from 87% in September to 90% in October. For a more detailed look at the weather specifics for October, check out Tallinn weather in October.

September and November exhibit contrasting weather patterns. In September, temperatures range from a mild 3°C (37°F) at night to a warm 24°C (75°F) during the day, with an average of 13°C (55°F). The month sees significant rainfall, totaling 78 mm (3.1 in) over 15 days, accompanied by high humidity levels of 87%. In contrast, November marks a notable drop in temperature, where the minimum dips to -5°C (24°F), and the average hangs around 4°C (40°F), with a maximum of just 13°C (55°F). Although November has less precipitation at 58 mm (2.3 in) over 13 days, humidity rises slightly to 91%. For more details on what to expect, check out Tallinn weather in November.

In September, Tallinn experiences milder temperatures, ranging from a chilly minimum of 3°C (37°F) to a pleasant maximum of 24°C (75°F), with an average temperature of 13°C (55°F). The month sees about 78 mm (3.1 inches) of precipitation spread over 15 days, and humidity levels settle around 87%. In contrast, December brings a stark change, with temperatures plummeting to a minimum of -17°C (1°F) and an average of 0°C (32°F), while the maximum only reaches 7°C (46°F). Although precipitation decreases to 60 mm (2.4 inches) over 16 rainy days, humidity rises slightly to 90%. For a detailed look at December weather, you can visit Tallinn weather in December.

Compare Tallinn's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Tallinn

As the warmth of summer gives way to the crispness of autumn, September in Tallinn presents a unique blend of weather phenomena. With average temperatures hovering around 13°C (55°F), this month is noticeably cooler than the preceding summer months, yet still offers the occasional sunny day with a maximum of 24°C (75°F). Rain is more frequent, as evidenced by the 15 days that see precipitation, contributing to the increased humidity of 87%. These shifting weather patterns make September a transitional month, inviting visitors to embrace the charm of Tallinn as it prepares for winter. For a deeper look into how September fits into the overall climate profile, check out Tallinn Climate.