São João de Meriti weather in March
In March, São João de Meriti has daytime highs averaging 30 °C, nights around 23 °C, with 21 wet days. Figures are 1991–2020 climate normals.
- 30.1°C Average high
- 22.8°C Average low
- 21days Wet days
- 215mm Rainfall
- 12h Daylight
Daily temperatures through March
How March develops
Averages for the first, middle and last part of the month, from daily 1991–2020 normals. Chance of rain is the share of years in which that calendar day recorded more than 1 mm.
| Days | Avg high | Avg low | Chance of rain |
|---|---|---|---|
| 1–10 March | 30.8 °C | 23.2 °C | 64 % |
| 11–20 March | 30.2 °C | 23.0 °C | 69 % |
| 21–31 March | 29.3 °C | 22.3 °C | 66 % |
- Average highs fall from 30.8 °C early in March to 29.3 °C by the end of it.
What to expect
| Measure | Typical March | Share of the month |
|---|---|---|
| Days above 25 °C | 30 of 31 | 96 % |
| Days above 30 °C | 16 of 31 | 51 % |
| Days below 0 °C | 0 of 31 | 0 % |
| Days with more than 1 mm rain | 21 of 31 | 67 % |
Conditions in March
| Measure | Average |
|---|---|
| Mean temperature | 26 °C |
| Record high (1991–2020) | 38 °C |
| Record low (1991–2020) | 18 °C |
| Relative humidity | 82 % |
| Wind speed | 10 km/h |
| Cloud cover | 65 % |
Where São João de Meriti ranks in March
| Ranking | Position | Value |
|---|---|---|
| The warmest places in South America in March | 50thof 50 | 30 °C |
March compared with the months around it
| Month | Avg high | Rainfall | Cloud |
|---|---|---|---|
| January | 31.2 °C | 258 mm | 72 % |
| February | 31.7 °C | 196 mm | 64 % |
| March | 30.1 °C | 215 mm | 65 % |
| April | 28.4 °C | 105 mm | 55 % |
| May | 26.1 °C | 76 mm | 53 % |
See all twelve months for São João de Meriti
- March is the 4th warmest month here.
- It is the 10th driest month of the year.
- It ranks 8th for least cloud cover.
- Days last about 12 hours from sunrise to sunset.
- It rains on 21 of 31 days — 67 % of the month.
- Nights are about 7.3 °C cooler than the middle of the day.
- The hottest March day on record since 1991 reached 38 °C, 7.4 °C above the usual daytime high.
Nearby destinations in March
| Destination | Avg high | Wet days | Sea |
|---|---|---|---|
| São João de Meriti | 30 °C | 21 | – |
| Duque de Caxias | 30 °C | 21 | – |
| Nova Iguaçu | 30 °C | 19 | – |
| Barra da Tijuca | 30 °C | 16 | 26 |
| Rio de Janeiro | 30 °C | 20 | 25 |
| Niterói | 30 °C | 19 | 25 |
| Magé | 29 °C | 19 | – |
| Petrópolis | 26 °C | 23 | – |
| Itaboraí | 29 °C | 21 | – |
QuestionsMarch in São João de Meriti, answered
How warm is São João de Meriti in March?
Daily highs average 30 °C and nights fall to about 23 °C, a spread of 7.3 °C between afternoon and dawn. That makes March the 3rd warmest month of the year here.
Does it rain much in São João de Meriti in March?
March averages 215 mm of rain, spread over about 21 of the 31 days — 67 % of the month. Cloud cover averages 65 % of the sky.
How long are the days in March?
São João de Meriti averages 12 hours between sunrise and sunset in March. Day length is computed from latitude and date, so it is exact rather than modelled — but it says nothing about how much of that time is sunny.
Data sources and method
- ERA5 / ERA5-Land reanalysis — Copernicus Climate Change Service (C3S), ECMWF. Copernicus Licence
- Open-Meteo — Open-Meteo.com. CC BY 4.0
- NOAA OISST v2.1 — NOAA Physical Sciences Laboratory. Public domain
- GeoNames — GeoNames.org. CC BY 4.0
- Normal period
- 1991–2020
- Dataset version
- era5-1991-2020-scores1.1
- Last processed
Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: daylight hours, beach and comfort scores, monthly rankings, threshold day counts, chance of a wet day by date, ten-day averages within the month. Full formulas are on the methodology page.
Contains modified Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.