Climate averages 1991–2020

Rio das Ostras weather
in March.

A hot, wet month: the 3rd warmest and the 9th driest of the year.

Long-term climate patterns, not a forecast for a particular trip.

Average high 28.6°C Daytime mean, March

Average low 22.8°C Night-time mean, March

Rainfall 172 mm 18 days with ≥1 mm

Daylight 12 h Sunrise to sunset, per day

March is a hot month in Rio das Ostras: daytime highs average 28.6°C and nights cool to about 22.8°C. By daytime temperature it is the 3rd warmest of the 12 months.

Expect about 172 mm of rain on roughly 18 days, which makes March a wet month (the 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 14 min on an average March day.

The nearest other city in this atlas is Macaé (23 km away). In March its highs average 28.3°C, about as warm as Rio das Ostras, with 124 mm of rain.

Among the 448 cities listed in Brazil, Rio das Ostras ranks joint 170th of 448 for the warmest March highs and joint 277th of 448 for the driest March (rainfall, lowest first). The mean March high of those 448 cities is 27.9°C; Rio das Ostras is 0.7°C warmer than that mean.

From March to April, average highs fall by 1.4°C to 27.2°C, and monthly rainfall falls from 172 mm to 85 mm.

The annual picture

March in context

30-year average

Average highAverage low°C

Monthly rainfall

Average total · mm

Averages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated

Every month, side by side

Rio das Ostras climate table

1991–2020

Monthly climate averages for Rio das Ostras, 1991–2020
Month	Average highHigh / low	Average low	Rainfall mm/month	Rain days ≥1 mm/day	Daylight hours/dayDaylight h/day
January	29.4°C23.2°C	23.2°C	206	16.5	13.313 h
February	29.8°C23.4°C	23.4°C	141	12.8	12.913 h
March, selected	28.6°C22.8°C	22.8°C	172	17.6	12.212 h
April	27.2°C21.3°C	21.3°C	85	12.1	11.612 h
May	25.1°C19.1°C	19.1°C	60	9.5	11.111 h
June	24.7°C17.9°C	17.9°C	31	5.9	10.811 h
July	24.4°C17.4°C	17.4°C	29	5.6	10.911 h
August	25.0°C17.8°C	17.8°C	34	6.5	11.311 h
September	25.7°C18.9°C	18.9°C	73	10.0	11.912 h
October	26.6°C20.2°C	20.2°C	108	11.9	12.613 h
November	26.8°C21.0°C	21.0°C	203	17.5	13.213 h
December	28.4°C22.4°C	22.4°C	222	19.0	13.513 h

Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.

Compare places

March in nearby cities

Distance from Rio das Ostras

Read the numbers correctly

Climate, not a promise.

These patterns help compare months. They cannot tell you the weather on a specific day of your trip.

Sources, method and limits

How these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Rio das Ostras) is explained once on the Rio das Ostras year overview and on the Sources, method and limits page.