Rio de Janeiro records about 1069mm of rain across roughly 96 wet days a year, which is a 26% chance on an average day. January is the wettest month at 137mm (13% of the annual total) and July the driest at 41mm. Local rain type: brief showers. Rio's summer (December-March) brings tropical downpours — intense but warm. Winter (June-August) is mostly dry and pleasant.
Chance of rain on an average day: 26%
Rainfall climatology for Rio de Janeiro. 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 | 1069mm |
| Rain days per year | 96 |
| Odds on an average day | 26% |
| Wettest month | January — 137mm over 12 days |
| Driest month | July — 41mm over 4 days |
| Rain type | brief showers |
| Best dry window | June through August offers dry, comfortable weather — ideal for sightseeing and beach days. |
| Worst rain window | December through March brings heavy tropical showers, often in late afternoon. |
January delivers 234% more rain than July (137mm vs 41mm). 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 Rio de Janeiro is spread through the year — there is no season you can rely on being dry.
Rio de Janeiro rain typically comes as discrete showers, so a compact umbrella and a flexible plan are usually enough.
Rain falls on about 12 days in January against 4 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 | 137mm | 12 | 40% | 31°C |
| February | 130mm | 12 | 40% | 31°C |
| March | 135mm | 12 | 40% | 30°C |
| April | 95mm | 9 | 30% | 29°C |
| May | 69mm | 6 | 20% | 27°C |
| June | 42mm | 4 | 13% | 26°C |
| July | 41mm | 4 | 13% | 25°C |
| August | 43mm | 4 | 13% | 25°C |
| September | 59mm | 5 | 17% | 26°C |
| October | 88mm | 8 | 27% | 27°C |
| November | 97mm | 9 | 30% | 29°C |
| December | 134mm | 12 | 40% | 30°C |
Rain probability is the chance that at least 0.2mm falls at your location — not how long it rains. For Rio de Janeiro 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.
Rio de Janeiro records rain on roughly 96 days a year — about a 26% chance on any given day — totalling around 1069mm.
January, with about 137mm over 12 rain days. That is 13% of the entire year's rainfall in a single month.
July is the driest month at 41mm across roughly 4 days. June through August offers dry, comfortable weather — ideal for sightseeing and beach days.
Rio's summer (December-March) brings tropical downpours — intense but warm. Winter (June-August) is mostly dry and pleasant.
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.