- Temperature
- -7 to 21.8°C
Updated July 2026 · Sources cited: weather-atlas.com, climatestotravel.com
Good to know
Good to Know
- June-August offers the most favorable conditions with mild warmth (19-22°C (66–72°F)) and nearly uninterrupted daylight; booking accommodation ahead essential for summer peak season.
- December marks the darkest period with only 0.7 hours of daily sunshine; extremely short daylight can impact mood and activity planning.
- Winter weather is highly unpredictable due to Atlantic and continental influences; sudden cold spells from Russia possible, with record low around -32°C (-26°F) in extreme cases.
- Humidity peaks at 87-89% in January-December, making cold feel sharper and contributing to gloomy atmosphere; May offers driest conditions (69% humidity).
- May is an excellent shoulder-season option: temperatures pleasant (15°C (59°F)), lightweight rain gear sufficient, fewer crowds than summer, and cultural events like Tallinn Music Week active.
- Lake-effect snow from Gulf of Finland can produce 10+ cm in a single day during December-January; weather fronts frequently bring unpredictable rainfall or heavy snow.
- Icy cobblestones on Toompea Hill during winter create genuine slip hazards; grippy waterproof boots strongly recommended for safety.
Best Months
June
- Description
- Start of summer with long daylight (18.5 hours), mild warmth, and extended outdoor opportunities
July
- Description
- Warmest month, mild conditions, near-endless daylight, and optimal for exploration
August
- Description
- Comfortable warmth, long daylight hours beginning slight decline, outdoor festivals
Worst Months
February
- Description
- Coldest month with intense freezing temperatures and minimal daylight
January
- Description
- Extreme cold, heavy snowfall, very short days with minimal sunshine
December
- Description
- Very dark period with only 6.2 hours of daylight and gloomy conditions
Rainfall
- Pattern
- Relatively evenly distributed throughout year; slightly wetter June-August and autumn months
- Annual Mm
- 700
- Driest Month
- February
- Annual Inches
- 27.5
- Wettest Month
- August
- Driest Month Mm
- 35
- Wettest Month Mm
- 85
Snowfall
- Presence
- Frequent in winter months
- Annual Snowfall Days
- 55
- January Snowfall Days
- 14
- December Snowfall Days
- 11
- Note
- Lake-effect snow possible December-January from Gulf of Finland, occasionally producing heavy accumulation in single day
Peak Temperature
- Month
- July
- Low Celsius
- 12.7
- High Celsius
- 21.8
- Low Fahrenheit
- 54.9
- High Fahrenheit
- 71.2
Seasonal Summary
- Autumn
- Dull and rainy; temperatures decline from September onwards; first snowfall typically late October to November
- Spring
- Gradual warming March-May; March still cold (-0.5°C (31°F) avg), May pleasant (15.2°C (59°F) avg)
- Summer
- Comfortable and mild June-August (19-21.8°C (66–71°F) highs); long daylight extending to 18.5 hours in June
- Winter
- Long, freezing, snowy; December-February with temperatures averaging -3.5°C (26°F) and high humidity (85-89%)
Off Peak Temperature
- Month
- February
- Low Celsius
- -7
- High Celsius
- -1.6
- Low Fahrenheit
- 19.4
- High Fahrenheit
- 29.1
AI-generated estimateData refreshed July 2026
Sources cited for this category
These are the sources cited in this climate & weather research for this city. Individual figures may not each trace to one of them.
More About Tallinn
Data last updated July 2026 · Verify anything important.