September weather - Autumn 2023

Weather in September
Frequently asked questions
Average temperature in September
Average humidity in September
Average rainfall in September
Average rainfall days in September
Average snowfall days in September
Average sea temperature in September
Average daylight in September
Average sunshine in September
Average UV index in September

A beautiful summer view of an ancient town in Tallinn, Estonia

Weather in September

In September, the tell-tale signs of the upcoming autumn season start to become apparent. As the leaves begin to change their hues, a chilly undercurrent threads through Tallinn's weather. Despite the noticeable decline in temperatures compared to August, September remains a favoured time for sightseeing and outdoor activities. The onset of autumn is accompanied by more frequent rain showers, becoming a common sight.

Temperature

The onset of September entails a temperature shift, as the average high-temperature decreases from a pleasant 20.4°C in August to a moderate 15.2°C. In September, the average low-temperature records at a frosty 7.8°C during the nights.

Humidity

In September, the average relative humidity in Tallinn is 82%.

Rainfall

In Tallinn, in September, during 16 rainfall days, 60mm of precipitation is typically accumulated. Throughout the year, in Tallinn, there are 120 rainfall days, and 617mm of precipitation is accumulated.

Snowfall

June through September are months without snowfall in Tallinn.

Sea temperature

In Tallinn, in September, the average water temperature is 15.8°C.
Note: Swimming is not a pleasurable activity for most people when the water temperature is 15.8°C. Breathing control gets harder as the water temperature drops from 21°C to 15°C.

Daylight

In Tallinn, the average length of the day in September is 12h and 51min.
On the first day of September in Tallinn, sunrise is at 06:16 and sunset at 20:25. On the last day of the month, sunrise is at 07:23 and sunset at 18:58 EEST.

Sunshine

In September, the average sunshine is 4.7h.

UV index

The average daily maximum UV index in September in Tallinn is 3. A UV Index reading of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for the ordinary person.
Note: In September, a daily UV index of 3 turns into the following recommendations:
Take heed. Individuals of lighter complexion can be burned in less than half an hour. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear.

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FAQ

What are September temperatures in Tallinn?

September temperatures in Tallinn, Estonia, vary between a high-temperature of 15.2°C and a low-temperature of 7.8°C.

What is the average humidity in September in Tallinn?

In Tallinn, the average relative humidity in September is 82%.

How much does it rain in Tallinn in September?

In September, in Tallinn, Estonia, the rain falls for 16 days. Throughout September, 60mm of precipitation is accumulated.

When it does not snow in Tallinn?

In Tallinn, snow does not fall in June through September.

Does it snow in Tallinn in September?

In Tallinn, Estonia, in September, it doesn't snow. In October, it regularly snows.

What is the sea temperature in September in Tallinn?

In September, the average sea temperature in Tallinn, Estonia, is 15.8°C. Swimming in 15.8°C is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 21°C.

What is the average length of the day in September in Tallinn?

In September, the average day length in Tallinn, Estonia, is 12h and 51min.

When are sunrise and sunset in September in Tallinn?

In September, on the first day of the month, sunrise is at 06:16 and sunset at 20:25. On the last day of the month, in Tallinn, sunrise is at 07:23 and sunset at 18:58 EEST.

How long on average sun shines in September in Tallinn?

In September, the average sunshine duration is 4.7h.

How high is the UV index in September in Tallinn?

In September, the average daily maximum UV index in Tallinn is 3. A UV Index value of 3 to 5 symbolizes a moderate vulnerability from unprotected exposure to UV radiation.

Today

Tomorrow

Long-term

Year J F M A M J J A September O N D

Aug

September

Oct

Average high temperature

20.4°C

15.2°C

9.4°C

Average low temperature

Average humidity

Average rainfall

Average rainfall days

Average snowfall days

Average sea temperature

Average daylight

Average sunshine

Average UV index

Average temperature in September
Tallinn, Estonia

Average high temperature in September: 15.2°C

The warmest month (with the highest average high temperature) is July (21.8°C).
The month with the lowest average high temperature is February (-1.6°C).

Average low temperature in September: 7.8°C

The month with the highest average low temperature is July (12.7°C).
The coldest month (with the lowest average low temperature) is February (-7°C).

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Average humidity in September
Tallinn, Estonia

Average humidity in September: 82%

The months with the highest relative humidity are January, November and December (88%).
The month with the lowest relative humidity is May (69%).

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Average rainfall in September
Tallinn, Estonia

Average rainfall in September: 60mm

The wettest month (with the highest rainfall) is July (74mm).
The driest month (with the least rainfall) is April (30mm).

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Average rainfall days in September
Tallinn, Estonia

Average rainfall days in September: 16 days

The months with the highest number of rainy days are September and October (16 days).
The month with the least rainy days is February (3 days).

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Average snowfall days in September
Tallinn, Estonia

Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (14 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average sea temperature in September
Tallinn, Estonia

Average sea temperature in September: 15.8°C

The best month for swimming (with the highest average sea temperature) is August (19.1°C).
The coldest months (with the lowest average sea temperature) are February and March (0.2°C).

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Average daylight in September /
Average sunshine in September
Tallinn, Estonia

Average daylight in September: 12h and 5min

The month with the longest days is June (Average daylight: 18h and 30min).
The month with the shortest days is December (Average daylight: 6h and 12min).

Average sunshine in September: 4h and 4min

The month with the most sunshine is June (Average sunshine: 10h and 6min).
The month with the least sunshine is December (Average sunshine: 0h and 30min).

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Average UV index in September
Tallinn, Estonia

Average UV index in September: 3

The months with the highest UV index are June and July (UV index 5).
The months with the lowest UV index are January, November and December (UV index 0).

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September weather forecast
Tallinn, Estonia

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