Climate averages 1991–2020
São João da Boa Vista weather
by month.
See how the year changes. October has the highest average daily maximum; August has the lowest average monthly rainfall.
Pleasant-weather months by our simple rule: MayJuneJulyAugust
Long-term climate patterns, not a forecast for a particular trip.
Across the year São João da Boa Vista averages a daytime high of 26.4°C and a nighttime low of 16.5°C, with about 1,534 mm of rain on roughly 158 days. October is the warmest month (average high 28.1°C) and June the coolest (23.5°C). January is the wettest month with 282 mm; August is the driest with 26 mm.
Months with pleasant weather by a simple rule (average high between 18°C and 29°C, average low of at least 5°C and at most 8 rain days): May, June, July and August. This looks at temperature and rain only, not humidity, wind, sea temperature or crowds.
The annual picture
A year in São João da Boa Vista
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
São João da Boa Vista climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 27.6°C19.5°C | 19.5°C | 282 | 24.0 | 13.313 h |
| February | 27.8°C19.4°C | 19.4°C | 213 | 20.3 | 12.813 h |
| March | 27.2°C18.6°C | 18.6°C | 183 | 19.9 | 12.212 h |
| April | 26.3°C16.7°C | 16.7°C | 80 | 10.3 | 11.612 h |
| May | 23.9°C13.7°C | 13.7°C | 56 | 6.4 | 11.111 h |
| June | 23.5°C12.5°C | 12.5°C | 32 | 4.1 | 10.811 h |
| July | 23.8°C12.2°C | 12.2°C | 27 | 3.3 | 10.911 h |
| August | 25.8°C13.5°C | 13.5°C | 26 | 3.7 | 11.411 h |
| September | 27.7°C16.2°C | 16.2°C | 77 | 8.7 | 12.012 h |
| October | 28.1°C18.0°C | 18.0°C | 122 | 14.5 | 12.613 h |
| November | 27.2°C18.4°C | 18.4°C | 191 | 19.4 | 13.113 h |
| December | 27.5°C19.2°C | 19.2°C | 245 | 23.4 | 13.413 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
Nearby cities
- Poços de CaldasBrazil · 32 kmHigh 23.6°C · Low 14.8°C · 1,827 mm rain a year
- Mogi GuaçuBrazil · 47 kmHigh 27.0°C · Low 16.7°C · 1,428 mm rain a year
- ItapiraBrazil · 52 kmHigh 26.8°C · Low 16.8°C · 1,399 mm rain a year
- Mogi MirimBrazil · 54 kmHigh 26.9°C · Low 16.7°C · 1,486 mm rain a year
- PirassunungaBrazil · 65 kmHigh 27.1°C · Low 17.1°C · 1,339 mm rain a year
- LemeBrazil · 66 kmHigh 27.0°C · Low 17.0°C · 1,519 mm rain a year
- ArarasBrazil · 74 kmHigh 26.7°C · Low 16.9°C · 1,519 mm rain a year
- CosmópolisBrazil · 86 kmHigh 27.0°C · Low 17.0°C · 1,424 mm rain a year
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 limitsWhat do the high and low temperatures mean?
We average the daily maximum and daily minimum for each calendar month over 1991–2020. They are not record extremes, a forecast range or temperatures at a fixed time of day.
How is a rain day counted?
A local calendar day (standard time, UTC-3, no daylight saving) with at least 1 mm of total precipitation counts as one rain day. We count these for each year and month, then average across 30 years. The average does not predict which days will be wet.
Where do the numbers come from?
ERA5-Land (temperature) and ERA5 (precipitation) reanalysis from the Copernicus Climate Change Service, read from the Open-Meteo open-data archive. Temperature comes from the 0.1° model cell at -22.00°, -46.80° (3 km from the city centre), adjusted up by 0.1°C for the difference between the city's elevation (774 m) and the cell's (782 m). Rain comes from the 0.25° cell at -22.00°, -46.75°. These are model estimates, not weather-station readings; coast, hills and city streets can differ.
Does this page show sunshine, humidity or sea temperature?
No. The data used here contain air temperature and precipitation only. Daylight hours are calculated from the city's latitude (sunrise to sunset), not measured sunshine.