São João de Meriti weather in August
In August, São João de Meriti has daytime highs averaging 26 °C, nights around 17 °C, with 7.4 wet days. Figures are 1991–2020 climate normals.
- 26.5°C Average high
- 16.9°C Average low
- 7.4days Wet days
- 42mm Rainfall
- 11h Daylight
Daily temperatures through August
How August 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 August | 26.3 °C | 16.6 °C | 23 % |
| 11–20 August | 26.0 °C | 16.7 °C | 23 % |
| 21–31 August | 27.1 °C | 17.3 °C | 25 % |
What to expect
| Measure | Typical August | Share of the month |
|---|---|---|
| Days above 25 °C | 20 of 31 | 63 % |
| Days above 30 °C | 6.7 of 31 | 22 % |
| Days below 0 °C | 0 of 31 | 0 % |
| Days with more than 1 mm rain | 7.4 of 31 | 24 % |
Conditions in August
| Measure | Average |
|---|---|
| Mean temperature | 21 °C |
| Record high (1991–2020) | 36 °C |
| Record low (1991–2020) | 11 °C |
| Relative humidity | 77 % |
| Wind speed | 12 km/h |
| Cloud cover | 45 % |
August compared with the months around it
| Month | Avg high | Rainfall | Cloud |
|---|---|---|---|
| June | 25.7 °C | 48 mm | 47 % |
| July | 25.5 °C | 47 mm | 45 % |
| August | 26.5 °C | 42 mm | 45 % |
| September | 27.5 °C | 87 mm | 57 % |
| October | 28.6 °C | 116 mm | 67 % |
See all twelve months for São João de Meriti
- August is the 9th warmest month here.
- It is the 1st driest month of the year.
- It ranks 1st for least cloud cover.
- Days last about 11 hours from sunrise to sunset.
- It rains on 7.4 of 31 days — 24 % of the month.
- Nights are about 9.6 °C cooler than the middle of the day.
- The hottest August day on record since 1991 reached 36 °C, 9.4 °C above the usual daytime high.
QuestionsAugust in São João de Meriti, answered
How warm is São João de Meriti in August?
Daily highs average 26 °C and nights fall to about 17 °C, a spread of 9.6 °C between afternoon and dawn. That makes August the 10th warmest month of the year here.
Does it rain much in São João de Meriti in August?
August averages 42 mm of rain, spread over about 7 of the 31 days — 24 % of the month. Cloud cover averages 45 % of the sky.
How long are the days in August?
São João de Meriti averages 11 hours between sunrise and sunset in August. 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.