Climate averages 1991–2020
Jacareí weather
in January.
A warm, very wet month: the 2nd warmest and the wettest of the year.
Long-term climate patterns, not a forecast for a particular trip.
January is a warm month in Jacareí: daytime highs average 27.4°C and nights cool to about 19.5°C. By daytime temperature it is the 2nd warmest of the 12 months.
Expect about 226 mm of rain on roughly 22 days, which makes January a very wet month (the wettest month of the year). Daylight, from sunrise to sunset, lasts about 13 h 23 min on an average January day.
The nearest other city in this atlas is São José dos Campos (16 km away). In January its highs average 27.5°C, about as warm as Jacareí, with 226 mm of rain.
Among the 448 cities listed in Brazil, Jacareí ranks joint 318th of 448 for the warmest January highs and joint 223rd of 448 for the driest January (rainfall, lowest first). The mean January high of those 448 cities is 28.5°C; Jacareí is 1.1°C cooler than that mean.
From January to February, average highs rise by 0.4°C to 27.8°C, and monthly rainfall falls from 226 mm to 173 mm.
The annual picture
January in context
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
Jacareí climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January, selected | 27.4°C19.5°C | 19.5°C | 226 | 21.9 | 13.413 h |
| February | 27.8°C19.6°C | 19.6°C | 173 | 18.6 | 12.913 h |
| March | 26.7°C18.9°C | 18.9°C | 139 | 18.0 | 12.212 h |
| April | 25.5°C17.2°C | 17.2°C | 57 | 9.5 | 11.612 h |
| May | 23.0°C14.3°C | 14.3°C | 57 | 7.6 | 11.011 h |
| June | 22.6°C12.8°C | 12.8°C | 38 | 5.1 | 10.711 h |
| July | 22.5°C12.0°C | 12.0°C | 44 | 5.1 | 10.811 h |
| August | 23.9°C12.9°C | 12.9°C | 35 | 5.3 | 11.311 h |
| September | 25.2°C14.9°C | 14.9°C | 77 | 9.9 | 11.912 h |
| October | 26.1°C16.6°C | 16.6°C | 109 | 13.5 | 12.613 h |
| November | 25.9°C17.3°C | 17.3°C | 142 | 16.6 | 13.213 h |
| December | 27.0°C18.7°C | 18.7°C | 172 | 20.1 | 13.514 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
January in nearby cities
- São José dos Campos in JanuaryBrazil · 16 kmHigh 27.5°C · Low 19.5°C · 226 mm rain
- Mogi das Cruzes in JanuaryBrazil · 33 kmHigh 26.3°C · Low 18.8°C · 253 mm rain
- Caçapava in JanuaryBrazil · 35 kmHigh 27.5°C · Low 19.3°C · 294 mm rain
- Arujá in JanuaryBrazil · 38 kmHigh 26.1°C · Low 18.5°C · 253 mm rain
- Itaquaquecetuba in JanuaryBrazil · 44 kmHigh 26.5°C · Low 19.0°C · 253 mm rain
- Ferraz de Vasconcelos in JanuaryBrazil · 49 kmHigh 26.5°C · Low 19.0°C · 253 mm rain
- Taubaté in JanuaryBrazil · 52 kmHigh 27.4°C · Low 18.9°C · 290 mm rain
- Guarulhos in JanuaryBrazil · 61 kmHigh 26.4°C · Low 18.9°C · 232 mm rain
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 limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Jacareí) is explained once on the Jacareí year overview and on the Sources, method and limits page.
São José dos Campos lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.