Montevideo records about 1088mm of rain across roughly 100 wet days a year, which is a 27% chance on an average day. October is the wettest month at 105mm (10% of the annual total) and July the driest at 68mm. Local rain type: steady rain. Montevideo gets moderate rain year-round with no truly dry month. Carry a compact umbrella — Río de la Plata winds make weather changeable.
Chance of rain on an average day: 27%
Rainfall climatology for Montevideo. 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.
Last updated: · Live forecast data refreshes hourly.
| Annual rainfall | 1088mm |
| Rain days per year | 100 |
| Odds on an average day | 27% |
| Wettest month | October — 105mm over 10 days |
| Driest month | July — 68mm over 7 days |
| Rain type | steady rain |
| Best dry window | March and April offer warm, relatively drier conditions. |
| Worst rain window | October and winter months can bring cold, wind-driven rain from the Río de la Plata. |
October delivers 54% more rain than July (105mm vs 68mm). That gap is the difference between planning around showers and ignoring them.
No single month holds more than 10% of the annual total, so rain in Montevideo is spread through the year — there is no season you can rely on being dry.
Montevideo rain typically comes as discrete showers, so a compact umbrella and a flexible plan are usually enough.
Rain falls on about 10 days in October against 7 in July — 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 | 85mm | 8 | 27% | 28°C |
| February | 88mm | 9 | 30% | 28°C |
| March | 95mm | 9 | 30% | 26°C |
| April | 92mm | 9 | 30% | 23°C |
| May | 88mm | 9 | 30% | 19°C |
| June | 77mm | 7 | 23% | 16°C |
| July | 68mm | 7 | 23% | 14°C |
| August | 72mm | 7 | 23% | 14°C |
| September | 79mm | 8 | 27% | 16°C |
| October | 105mm | 10 | 33% | 19°C |
| November | 88mm | 9 | 30% | 23°C |
| December | 95mm | 9 | 30% | 26°C |
Rain probability is the chance that at least 0.2mm falls at your location — not how long it rains. For Montevideo 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.
Montevideo records rain on roughly 100 days a year — about a 27% chance on any given day — totalling around 1088mm.
October, with about 105mm over 10 rain days. That is 10% of the entire year's rainfall in a single month.
July is the driest month at 68mm across roughly 7 days. March and April offer warm, relatively drier conditions.
Montevideo gets moderate rain year-round with no truly dry month. Carry a compact umbrella — Río de la Plata winds make weather changeable.
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.