Climate averages 1991–2020

Petrópolis 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.

Average high 26.9°C Daytime mean, January

Average low 19.6°C Night-time mean, January

Rainfall 315 mm 23 days with ≥1 mm

Daylight 13 h Sunrise to sunset, per day

January is a warm month in Petrópolis: daytime highs average 26.9°C and nights cool to about 19.6°C. By daytime temperature it is the 2nd warmest of the 12 months.

Expect about 315 mm of rain on roughly 23 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 Magé (22 km away). In January its highs average 30.1°C, 3.2°C warmer than Petrópolis, with 244 mm of rain.

Among the 448 cities listed in Brazil, Petrópolis ranks joint 351st of 448 for the warmest January highs and joint 428th of 448 for the driest January (rainfall, lowest first). The mean January high of those 448 cities is 28.5°C; Petrópolis is 1.5°C cooler than that mean.

From January to February, average highs rise by 0.4°C to 27.3°C, and monthly rainfall falls from 315 mm to 233 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

Petrópolis climate table

1991–2020

Monthly climate averages for Petrópolis, 1991–2020
Month	Average highHigh / low	Average low	Rainfall mm/month	Rain days ≥1 mm/day	Daylight hours/dayDaylight h/day
January, selected	26.9°C19.6°C	19.6°C	315	22.9	13.313 h
February	27.3°C19.6°C	19.6°C	233	18.5	12.913 h
March	25.9°C19.0°C	19.0°C	244	22.0	12.212 h
April	24.3°C17.4°C	17.4°C	105	14.0	11.612 h
May	22.0°C14.8°C	14.8°C	70	10.9	11.111 h
June	21.6°C13.6°C	13.6°C	41	7.0	10.811 h
July	21.4°C13.0°C	13.0°C	39	6.6	10.911 h
August	22.5°C13.5°C	13.5°C	42	7.2	11.311 h
September	23.8°C15.1°C	15.1°C	88	10.8	11.912 h
October	24.8°C16.7°C	16.7°C	137	15.1	12.613 h
November	24.6°C17.5°C	17.5°C	252	20.0	13.213 h
December	26.1°C18.9°C	18.9°C	295	23.2	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 Petrópolis

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 Petrópolis) is explained once on the Petrópolis year overview and on the Sources, method and limits page.