Spring — March to May
Spring arrives late and reluctantly in Tallinn. March is still effectively winter (−2 to 4°C), with lingering snow and ice on the cobblestones well into the month. April is the real transition — temperatures climb to 4–10°C, the Baltic Sea ice breaks up, and the city visibly shakes off winter. May is the pleasant surprise: 9–16°C, long daylight hours, parks in Kadriorg and along the coast coming into bloom, and the old town filling with outdoor café seating again.
Spring is a genuinely good time to visit — prices are lower than summer, crowds are thin, and the light stretches later each week. Pack for changeable conditions: a cold snap in March can still bring snow, while a warm spell in May can feel almost like early summer.
Key events: Tallinn Music Week (April) is Estonia's most forward-looking music and culture festival, taking over venues across the city with an emphasis on new European and Nordic acts. Walpurgis Night and May Day (April 30–May 1) bring student celebrations and public gatherings, particularly around Tartu but felt in Tallinn too.
What to pack: a proper waterproof jacket, layers, and warm accessories for March and early April. By May, a light jacket and layers for cool mornings are enough. Sturdy shoes — the old town's cobblestones stay damp longer than you'd expect.
Summer — June to August
Summer in Tallinn is short, mild, and genuinely lovely when it delivers. June is the standout month: temperatures of 14–20°C, and — thanks to Tallinn's northern latitude — near-white nights around the summer solstice, when the sky never fully darkens. July and August are the warmest months, typically 17–22°C, occasionally pushing past 25°C during a heatwave, though the Baltic Sea keeps the air noticeably cooler and fresher than continental Europe at the same latitude.
This is peak tourist season. Cruise ships dock daily in July and August, and the old town's main squares and streets can feel crowded by midday — arrive before 9am if you want the Lower Town to yourself. Outside the old town, Kalamaja and Telliskivi stay relaxed even at peak season.
Key events: Jaanipäev (Midsummer, June 23–24) is Estonia's most important holiday — bonfires, singing, and celebrations nationwide, though many Tallinn residents head to the countryside for it, leaving the city unusually quiet. Tallinn Old Town Days (early June) brings medieval-themed festivities, craft markets, and street performances to the Lower Town. Öölaulupidu and other national song festival events occur periodically and are worth checking for.
What to pack: light layers, a rain jacket (summer showers are common even in July), and a light sweater for evenings — Baltic summer nights rarely stay warm even after a hot day. Sunscreen for the long daylight hours.
Autumn — September to November
September is arguably Tallinn's most underrated month: 10–16°C, golden light on the old town's spires and city walls, and a sharp drop in tourist numbers after the August cruise-ship peak. The Baltic Sea stays relatively mild into early autumn, extending the outdoor café season a few weeks longer than you'd expect this far north.
October brings the real shift — temperatures fall to 5–11°C, days shorten noticeably, and the first storms roll in off the Gulf of Finland. November is grey, windy, and cold (0–6°C), with the city visibly preparing for winter. Rain and sleet are common, and this is Tallinn's least photogenic month, though also its quietest and cheapest for a visit.
Key events: Tallinn Black Nights Film Festival (mid-November to early December) is one of the largest film festivals in Northern Europe, filling cinemas across the city with an international programme — a good reason to visit in the otherwise low-season month of November. Early December sees the build-up to the Christmas market, with the Town Hall Square stalls going up in the last days of November.
What to pack: a proper autumn coat, waterproof layers from October onward, and warm accessories by November. An umbrella is essential — Baltic autumn storms arrive with little warning.
Winter — December to February
Tallinn winters are genuinely cold — typically −5 to 0°C, with cold snaps regularly dropping to −10°C or lower, particularly in January and February. Snow is reliable most years from December through March, and the old town under snow, with its towers and steep-roofed merchant houses, is one of the most beautiful winter cityscapes in Europe. Daylight is scarce: by late December, the sun rises around 9am and sets before 4pm.
December is transformed by the Christmas market on Town Hall Square, one of the oldest and most celebrated in Europe — the tradition of decorating a public Christmas tree here is said to date to 1441, making Tallinn's claim to the "first Christmas tree" one of the most credible in Europe. Mulled wine (hõõgvein), gingerbread (piparkoogid), and handicraft stalls fill the square from late November through early January.
January and February are the coldest, darkest, and quietest months — the Baltic Sea sometimes partially freezes near the shore, and the city takes on a stark, atmospheric character with very few other visitors. Hotel prices drop significantly outside the Christmas period, and this is a legitimate option for travellers who like cold-weather cities without the crowds.
What to pack: a heavy insulated coat, thermal layers, waterproof and insulated boots (the cobblestones ice over), a hat, scarf, and gloves. The wind off the Gulf of Finland cuts sharply through anything less. Days are short, so plan indoor activities — museums, cafés, saunas — for the afternoon hours.