Weather in Rio de Janeiro in March

Shoulder season. March sits in between. You will get good days and you will lose some. You should expect rain on 19 days of the month, which is more days wet than dry.

March ranks 10 of 12 — near the bottom of Rio de Janeiro's year. July is the month that works, and the swing between the two is 36 points, which is a different holiday rather than a slightly better one.

Rain on 19 days, 5 of them heavy. Enough to need a plan B, not enough to need a plan around it. Natural fibres and a second shirt for the day. At 83% nothing dries, including you.

What the averages hide

Averages flatten a month, and this one hides a few things: 8 days top 30 °C — hot spells arrive, but they break; the day barely swings — 4.7 °C between the overnight low and the afternoon high. Across the twenty years measured, the hottest March day reached 34.9 °C and the coldest night fell to 21.3 °C, and the wettest single day dropped 104 mm — roughly 60% of the month's rain in one day.

March is statistically steady but not small: the year-to-year variation is modest in relative terms, yet the wettest March on record still delivered 282 mm against 37 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 173 mm average is a reasonable planning figure, not a promise.

Wind is light at 8.8 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 83%, high enough to notice on the warm days without dominating them.

How March sits in the year

Temperatures hold steady either side: 29.2 °C in February, 28.5 here, 27.5 in April. Nothing about the timing within the month matters much. Rain is the thing that moves: April brings 5 days less of it, so pushing the dates later buys drier weather.

Daylight in March

12.3 hours of daylight, losing 0.7 hours across the month. That is between Rio de Janeiro's extremes of 13.5 and 10.7 hours, so days are long enough not to constrain the plan.

Sea temperature

The sea sits at about 26.7 °C in March — warm enough to stay in as long as you like. This is the warmest the water gets all year.

How busy it gets

Off season. The genuine off season: cheapest by a distance, with the caveat that some tours and restaurants close entirely.

Crowd levels are estimated from climate desirability and school-holiday calendars, not from visitor numbers.

March in Rio de Janeiro versus nearby

If Rio de Janeiro is one option among several, the nearby comparison is worth making. Belo Horizonte is close enough to be a coin toss — within a degree on temperature, 1 day less rain. São Paulo is close enough to be a coin toss — within a degree on temperature, 1 day more rain.

So: March is a compromise. July is 33 points better and is what Rio de Janeiro is actually like at its best — worth moving the trip for if that is possible, and worth adjusting expectations for if it is not.

Every month in Rio de Janeiro

See all twelve months in Rio de Janeiro, or where else to go in March.