Búzios records about 850mm of rain across roughly 72 wet days a year, which is a 20% chance on an average day. December is the wettest month at 72mm (8% of the annual total) and August the driest at 22mm. Local rain type: brief showers. Búzios enjoys a microclimate drier than nearby Rio. The peninsula gets sea breezes that moderate rainfall — most days have more sun than cloud.
Chance of rain on an average day: 20%
Rainfall climatology for Búzios. 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 | 850mm |
| Rain days per year | 72 |
| Odds on an average day | 20% |
| Wettest month | December — 72mm over 9 days |
| Driest month | August — 22mm over 3 days |
| Rain type | brief showers |
| Best dry window | June through September offers dry, mild conditions. |
| Worst rain window | December through March brings warm summer showers. |
December delivers 227% more rain than August (72mm vs 22mm). That gap is the difference between planning around showers and ignoring them.
No single month holds more than 8% of the annual total, so rain in Búzios is spread through the year — there is no season you can rely on being dry.
Búzios rain typically comes as discrete showers, so a compact umbrella and a flexible plan are usually enough.
Rain falls on about 9 days in December against 3 in August — 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 | 65mm | 8 | 27% | 30°C |
| February | 55mm | 7 | 23% | 30°C |
| March | 62mm | 7 | 23% | 29°C |
| April | 65mm | 8 | 27% | 28°C |
| May | 55mm | 7 | 23% | 26°C |
| June | 35mm | 4 | 13% | 25°C |
| July | 25mm | 3 | 10% | 24°C |
| August | 22mm | 3 | 10% | 24°C |
| September | 32mm | 4 | 13% | 25°C |
| October | 52mm | 6 | 20% | 26°C |
| November | 65mm | 8 | 27% | 28°C |
| December | 72mm | 9 | 30% | 29°C |
Rain probability is the chance that at least 0.2mm falls at your location — not how long it rains. For Búzios 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.
Búzios records rain on roughly 72 days a year — about a 20% chance on any given day — totalling around 850mm.
December, with about 72mm over 9 rain days. That is 8% of the entire year's rainfall in a single month.
August is the driest month at 22mm across roughly 3 days. June through September offers dry, mild conditions.
Búzios enjoys a microclimate drier than nearby Rio. The peninsula gets sea breezes that moderate rainfall — most days have more sun than cloud.
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.