Tartu records about 594mm of rain across roughly 105 wet days a year, which is a 29% chance on an average day. October is the wettest month at 78mm (13% of the annual total) and April the driest at 30mm. Local rain type: brief showers.
Chance of rain on an average day: 29%
Rainfall climatology for Tartu. The live hour-by-hour answer for today loads at the top of this page from Open-Meteo and refreshes through the day — the figures below describe a typical year, not today.
Conditions on this page are recalculated from the latest forecast every time it is opened, for the current date in the location's own time zone. Showing .
| Annual rainfall | 594mm |
| Rain days per year | 105 |
| Odds on an average day | 29% |
| Wettest month | October — 78mm over 13 days |
| Driest month | April — 30mm over 5 days |
| Rain type | brief showers |
| Best dry window | April is the most reliable dry stretch of the year. |
| Worst rain window | October carries the highest chance of a washed-out day. |
October delivers 160% more rain than April (78mm vs 30mm). That gap is the difference between planning around showers and ignoring them.
No single month holds more than 13% of the annual total, so rain in Tartu is spread through the year — there is no season you can rely on being dry.
Tartu rain typically comes as discrete showers, so a compact umbrella and a flexible plan are usually enough.
Rain falls on about 13 days in October against 5 in April — the frequency swing matters more for planning than the millimetre totals.
Climate normals. Use them to judge whether today's live forecast at the top of the page is typical or unusual for the season.
| Month | Rainfall | Rain days | Chance on a given day | Highs |
|---|---|---|---|---|
| January | 36mm | 8 | 27% | 0°C |
| February | 36mm | 8 | 27% | 2°C |
| March | 42mm | 7 | 23% | 6°C |
| April | 30mm | 5 | 17% | 12°C |
| May | 30mm | 5 | 17% | 17°C |
| June | 42mm | 7 | 23% | 21°C |
| July | 54mm | 9 | 30% | 23°C |
| August | 66mm | 11 | 37% | 21°C |
| September | 78mm | 13 | 43% | 17°C |
| October | 78mm | 13 | 43% | 12°C |
| November | 66mm | 11 | 37% | 6°C |
| December | 36mm | 8 | 27% | 2°C |
Rain probability is the chance that at least 0.2mm falls at your location — not how long it rains. For Tartu we combine the hourly probability curve, expected volume in millimetres, and the city's own rainfall record into a single umbrella verdict.
| Factor | Weight | What it measures |
|---|---|---|
| Hourly probability | 40% | Peak and sustained chance of measurable rain across the next 24 hours. |
| Expected volume | 30% | Total millimetres, which separates a passing shower from a genuine soaking. |
| Timing & duration | 20% | When rain starts, when it eases, and the longest continuous dry window. |
| Local rain type | 10% | Drizzle, brief showers, thunderstorms or monsoon — each needs different gear. |
Live hourly values come from Open-Meteo and refresh through the day. Monthly rainfall figures are climate normals, so they describe a typical year rather than a forecast.
Tartu records rain on roughly 105 days a year — about a 29% chance on any given day — totalling around 594mm.
October, with about 78mm over 13 rain days. That is 13% of the entire year's rainfall in a single month.
April is the driest month at 30mm across roughly 5 days.
With rain on about 29% of days and brief showers as the dominant type, a compact umbrella or waterproof shell is worth packing for Tartu outside April.
No. Probability is the chance that at least 0.2mm of rain falls at your location at some point in the period. Check the expected millimetres alongside it: 40% with 0.4mm is a passing shower, 40% with 12mm is a soaking.