Climate averages 1991–2020

Jaú weather
in January.

A hot, very wet month: the joint 5th warmest and the wettest of the year.

Long-term climate patterns, not a forecast for a particular trip.

Average high 28.7°C Daytime mean, January

Average low 20.9°C Night-time mean, January

Rainfall 247 mm 22 days with ≥1 mm

Daylight 13 h Sunrise to sunset, per day

January is a hot month in Jaú: daytime highs average 28.7°C and nights cool to about 20.9°C. By daytime temperature it is the joint 5th warmest of the 12 months.

Expect about 247 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 20 min on an average January day.

The nearest other city in this atlas is Bauru (52 km away). In January its highs average 28.7°C, about as warm as Jaú, with 253 mm of rain.

Among the 448 cities listed in Brazil, Jaú ranks joint 210th of 448 for the warmest January highs and joint 300th of 448 for the driest January (rainfall, lowest first). The mean January high of those 448 cities is 28.5°C; Jaú is 0.3°C warmer than that mean.

From January to February, average highs rise by 0.3°C to 29.0°C, and monthly rainfall falls from 247 mm to 182 mm.

The annual picture

January in context

30-year average

Average highAverage low°C

Monthly rainfall

Average total · mm

Averages 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

1991–2020

Monthly climate averages for Jaú, 1991–2020
Month	Average highHigh / low	Average low	Rainfall mm/month	Rain days ≥1 mm/day	Daylight hours/dayDaylight h/day
January, selected	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

January in nearby cities

Distance from Jaú

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 limits

How these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Jaú) is explained once on the Jaú year overview and on the Sources, method and limits page.