Climate averages 1991–2020
Jaú weather
by month.
See how the year changes. October has the highest average daily maximum; July has the lowest average monthly rainfall.
Pleasant-weather months by our simple rule: AprilMayJuneJulyAugustSeptember
Long-term climate patterns, not a forecast for a particular trip.
Across the year Jaú averages a daytime high of 27.5°C and a nighttime low of 17.9°C, with about 1,297 mm of rain on roughly 140 days. October is the warmest month (average high 29.4°C) and June the coolest (24.4°C). January is the wettest month with 247 mm; July is the driest with 27 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): April, May, June, July, August and September. This looks at temperature and rain only, not humidity, wind, sea temperature or crowds.
The annual picture
A year in Jaú
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
Jaú climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 28.7°C20.9°C | 20.9°C | 247 | 22.0 | 13.313 h |
| February | 29.0°C20.9°C | 20.9°C | 182 | 19.2 | 12.913 h |
| March | 28.3°C20.2°C | 20.2°C | 139 | 17.3 | 12.212 h |
| April | 27.5°C18.5°C | 18.5°C | 58 | 8.0 | 11.612 h |
| May | 24.9°C15.6°C | 15.6°C | 56 | 6.2 | 11.111 h |
| June | 24.4°C14.3°C | 14.3°C | 37 | 4.1 | 10.811 h |
| July | 24.8°C13.9°C | 13.9°C | 27 | 3.5 | 10.911 h |
| August | 27.0°C15.0°C | 15.0°C | 29 | 3.6 | 11.311 h |
| September | 28.8°C17.1°C | 17.1°C | 64 | 7.4 | 11.912 h |
| October | 29.4°C18.8°C | 18.8°C | 110 | 12.6 | 12.613 h |
| November | 28.7°C19.3°C | 19.3°C | 156 | 15.5 | 13.213 h |
| December | 29.0°C20.5°C | 20.5°C | 191 | 20.2 | 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
Nearby cities
- BauruBrazil · 52 kmHigh 27.5°C · Low 17.9°C · 1,303 mm rain a year
- BotucatuBrazil · 67 kmHigh 24.9°C · Low 15.4°C · 1,644 mm rain a year
- AraraquaraBrazil · 68 kmHigh 27.0°C · Low 17.6°C · 1,386 mm rain a year
- São CarlosBrazil · 75 kmHigh 25.9°C · Low 16.3°C · 1,350 mm rain a year
- MatãoBrazil · 80 kmHigh 27.8°C · Low 18.4°C · 1,486 mm rain a year
- AvaréBrazil · 97 kmHigh 25.1°C · Low 16.3°C · 1,295 mm rain a year
- Rio ClaroBrazil · 103 kmHigh 26.7°C · Low 16.6°C · 1,521 mm rain a year
- PiracicabaBrazil · 105 kmHigh 27.2°C · Low 17.1°C · 1,290 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 -22.30°, -48.60° (4 km from the city centre), adjusted up by 0.1°C for the difference between the city's elevation (528 m) and the cell's (547 m). Rain comes from the 0.25° cell at -22.25°, -48.50°. 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.