Tallinn Weather in September

🇪🇪 Estonia

15°C

High

10°C

Low

Rain Days

Sunshine

65%

Humidity

Europe › 🇪🇪 Estonia › Tallinn

Updated: March 2026

Is September a Good Time to Visit Tallinn?

6/10

Good

September is a good time to visit Tallinn (6/10). With 9 daily sunshine hours and only 12 rain days, this month delivers genuinely reliable outdoor conditions, ranking it 6th sunniest of the year in Tallinn. Culture-focused travellers and those who prefer lighter crowds will find September a practical choice, with prices running lower than peak July without sacrificing all the good weather. October offers a similar profile at lower hotel rates if dates are flexible. The main practical note: Tallinn's popular sites are busiest between 10am and 3pm regardless of season. Arriving at opening time or after 4pm makes a significant difference to the experience. Planning tips: accommodation is generally available without long lead times, and flight prices are typically lower than peak season. Flexible travellers will find the best deals by booking 2-4 weeks ahead. Mid-week arrivals consistently unlock lower hotel rates than weekend check-ins.

vs August:20°C avg high

Step off the plane in Tallinn in September and the air meets you at around 15°C, crisp and clear, the kind of chill that sharpens your senses and makes the first coffee taste twice as good. By the time evening arrives and temperatures settle near 10°C, the city takes on a different character entirely. With 9 hours of daylight sun on offer, September gives you the raw material for a genuinely memorable trip.

15°C

Avg High

10°C

Avg Low

12 days

Rain Days

Sunshine

65%

Humidity

Temperature in Tallinn in September

The narrow 5°C gap between daytime and overnight temperatures, characteristic of coastal cities with maritime moderation, means a single mid-layer works across the whole day. Humidity averages 65%, which is comfortable for most visitors. On warmer days, lighter fabrics help with the mild stickiness in the afternoon. UV index averages 6 this month, classed as moderate. Sunscreen is a sensible precaution for extended outdoor time, particularly at midday. Wind averages 21 km/h, light enough to be refreshing on warm days but noticeable in open coastal areas or elevated viewpoints. In Fahrenheit: 59°F average high, 50°F overnight low. Data sourced from Open-Meteo ERA5 climate reanalysis (1991–2020 normals).

Temperature in September

Monthly Precipitation (mm)

What to Wear in Tallinn in September

Morning10°CBefore the day warms up

Afternoon15°CPeak daytime temperature

Evening13°CAfter sunset cools down

Packing for Tallinn in September means dressing for 15°C days and 10°C evenings. A mid-weight jacket over a sweater handles 15°C daytime temperatures; the combination stays comfortable all day without overheating. Evening temperatures settle at 10°C, a modest 5°C drop that a light cardigan or denim jacket covers. European cobblestones reward low-profile walking shoes over flip-flops or heels, with cushioned trainers or leather walking shoes being the practical choice. A compact foldable umbrella weighs almost nothing and earns its keep across 12 potential rainy days.

💡

Local tip: Tallinn's cobbled streets turn slippery in the rain. Waterproof walking shoes with a non-slip sole outperform fashionable footwear on wet stone, and you'll cover significantly more ground in comfort.

Events in Tallinn in September

September has no major festivals or public holidays in Tallinn, which is one of its practical advantages for independent travellers. Attractions run at lower capacity than during peak event periods, queues are shorter, and accommodation is easier to find without needing to book many months in advance. Local restaurants, markets, and transport operate at a relaxed pace, making this an ideal time for visitors who prefer a more authentic, unhurried experience of everyday city life rather than large crowds drawn in by a single major headline event.

What to Pack for Tallinn in September

Based on 15°C average highs and 12 rainy days

Warm jacket (down or fleece)
Merino wool base layer (regulates temperature and resists odour)
Sweaters and lined trousers
Scarf and lightweight gloves
Compact folding umbrella
Waterproof outer layer or packable rain jacket
Quick-dry clothing that recovers fast after a shower
Comfortable walking shoes (a second pair lets the first air out overnight)
Universal travel adapter
Small day pack for city exploration
Reusable water bottle

Best Activities in Tallinn in September

Explore the old town's cobblestone backstreetsMorning (9-11am)At 15°C, conditions are pleasant for unhurried exploration on foot
Visit hilltop viewpoints for panoramic city viewsLate afternoon (4-6pm)Low sun angle creates dramatic light for photography while temperatures remain comfortable
Bicycle rental for a half-day city circuitMid-morning startMild 15°C temperatures are ideal for extended cycling without excessive effort
Boat tour of the river, bay, or canal networkLate morning departureComfortable weather makes open-deck boats viable without wind-chill concerns
Afternoon in a world-class museum or galleryAfternoon (2-5pm)Pairs well with outdoor morning activities and provides a mid-day rest from sightseeing
Coffee-house or traditional cafe culture experienceMid-morning or post-lunchA cultural ritual in this region that rewards slow appreciation regardless of weather
Evening live music, theatre, or opera performanceEvening shows typically at 7-9pmConsistent evening temperatures make getting to and from evening venues comfortable
Visit the main botanical garden or city park at seasonal peakYear-round; best light in morningSeptember brings distinct seasonal changes to public green spaces worth exploring
Warm up with traditional hot dishes: local stew, fondue, or braised specialities at a neighbourhood restaurantLunch (12-2pm) or dinner (7-9pm)Cold-weather cuisine is a genuine cultural experience and the best local restaurants serve their heartiest dishes in cooler months

Why is Tallinn mild in September?

September brings the first meaningful shift toward cooler conditions in Tallinn, as the sun angle drops and day length shortens. Temperatures averaging 15°C by day and 10°C overnight are still comfortable by most standards, but the trend is clearly downward. At 59 degrees north latitude, autumn light has a particular quality: lower in the sky and warmer in tone, it gives the city a photogenic quality quite different from summer. Evening temperatures already demand a jacket, but midday hours stay pleasant for sightseeing. Climate data: Open-Meteo ERA5 (1991–2020).

Sunshine Hours

The average number of hours per day with direct sunlight. Calculated from satellite measurements. Days with more than 7 hours of sunshine are ideal for outdoor activities. Under 3 hours means overcast conditions dominate.

UV Index

A scale from 0-11+ measuring ultraviolet radiation intensity. UV 0-2: Minimal risk. UV 3-5: Moderate -- wear sunscreen. UV 6-7: High -- hat and SPF 30+ essential. UV 8-10: Very High -- limit midday exposure. UV 11+: Extreme -- seek shade between 10am-4pm.

Rain Days

A rain day is counted when precipitation exceeds 0.1mm. This threshold captures even light drizzle. Unlike total rainfall in mm, rain days tells you how often you might need an umbrella, which is useful for planning outdoor activities.

Humidity

Relative humidity as a percentage. Below 40%: Dry -- skin and throat may feel parched. 40-60%: Comfortable -- ideal for most people. 60-80%: Sticky -- light, breathable fabrics recommended. Above 80%: Muggy -- heat feels more intense; quick-dry clothing is essential.

Frequently Asked Questions: Tallinn in September

In September, Tallinn experiences average highs of 15°C (59°F) and lows of 10°C (50°F). Expect around 12 rainy days and 9 hours of sunshine per day, with humidity averaging 65%. The 5°C gap between daytime and overnight temperatures is worth planning around: light layers work for most visitors during the day, but an extra jacket is essential for evenings. UV index averages 6, so sun protection is advisable on clear days.

Tallinn typically sees 12 rainy days in September, with total precipitation of around 59mm. Rain is moderate and manageable. Showers tend to pass quickly, and a light rain layer or foldable umbrella is sufficient protection for most days. For context, the driest month in Tallinn typically sees 4-6 fewer rain days than September.

Pack a warm jacket, sweaters, and layering pieces for Tallinn in September. Temperatures can drop to 10°C at night, so thermal underlayers are advisable for evening outings. Waterproof footwear is important with 12 rainy days expected. A scarf, hat, and gloves handle the windchill on clear cold days, which often feel colder than the thermometer reads.

September is a reasonable time to visit Tallinn. Expect 12 rainy days, so pack a light rain layer for flexibility. Average temperatures of 15°C make outdoor exploration comfortable during the dry periods. With 9 daily sunshine hours, there are reliable windows of good weather to plan outdoor activities around, even if the month is not the driest on the calendar.

The average high temperature in Tallinn in September is 15°C (59°F), and the average low is 10°C (50°F). The mean daily temperature is approximately 13°C (55°F). The day-to-night range of 5°C is narrow, typical of coastal or maritime cities. These are 30-year climate normals based on the 1991 to 2020 reference period; individual years will vary, particularly in transitional months like spring and autumn.

The best month to visit Tallinn is generally May. May offers the most sunshine at 13 hours per day and only 9 rainy days. Average temperatures reach 15°C, making it comfortable for sightseeing, outdoor dining, and exploring the city. If your travel dates are flexible, planning your trip around May gives you the best chance of dry, bright weather.

September is shoulder or low season in Tallinn, meaning fewer tourists and generally lower prices than peak months. With 9 sunshine hours and 12 rainy days, the weather is less of a draw for mass tourism. This is an advantage for travellers who prefer a quieter, more relaxed experience with shorter queues and easier accommodation availability.

In September, Tallinn suits a range of activities thanks to cool conditions around 15°C. Mix of indoor and outdoor activities works well given the moderate chance of rain. Top options include exploring historic neighbourhoods, visiting museums and galleries, local food markets, and day trips to surrounding areas. With 9 hours of sunshine, parks and waterfront walks are particularly enjoyable.

September ranks 6th sunniest of the year in Tallinn, with an average 9 daily sunshine hours. The driest months are February, March, and April. July is the hottest month (21°C avg high); February is the coolest (-2°C). From here, temperatures fall 6°C into October. Compared to last month (August: 20°C high, 14 rain days), September is cooler and drier. September sits in the middle of the annual sunshine ranking for Tallinn, offering a reasonable balance of good weather and manageable crowds.

Year-Round Climate

Month	High	Low	Rain Days	Sun	Details
January	-1°C	-5°C	11	2h	View
February	-2°C	-7°C	9	4h	View
March	2°C	-4°C	9	7h	View
April	9°C	1°C	9	10h	View
May	15°C	6°C	9	13h	View
June	19°C	11°C	11	13h	View
July	21°C	14°C	12	14h	View
August	20°C	14°C	14	12h	View
September	15°C	10°C	12	9h	View
October	9°C	5°C	13	5h	View
November	4°C	0°C	11	2h	View
December	1°C	-3°C	12	1h	View

Other Months in Tallinn

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Plan Your Trip to Tallinn

Best Time to Visit Tallinn Tallinn vs Stockholm in September Tallinn vs Helsinki in September

Nearby Destinations with Similar Weather

These cities are within 500 km and experience broadly comparable weather conditions during the same calendar month, making them practical standalone alternatives or worthwhile additions to a longer regional itinerary.

Stockholm🇸🇪 Sweden379 km away

16°C10°C low

Helsinki🇫🇮 Finland82 km away

15°C10°C low

Riga🇱🇻 Latvia280 km away

17°C10°C low

Data Sources for Tallinn

Tallinn on Wikipedia Open-Meteo Climate API NOAA National Centers UK Met Office WMO GeoNames

Climate normals represent 30-year averages (1991-2020). Individual years may vary.