Climate averages 1991–2020

Araruama weather
in January.

A warm, wet month: the 2nd warmest and the 11th driest of the year.

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

Average high 27.5°C Daytime mean, January

Average low 23.6°C Night-time mean, January

Rainfall 178 mm 16 days with ≥1 mm

Daylight 13 h Sunrise to sunset, per day

January is a warm month in Araruama: daytime highs average 27.5°C and nights cool to about 23.6°C. By daytime temperature it is the 2nd warmest of the 12 months.

Expect about 178 mm of rain on roughly 16 days, which makes January a wet month (the 11th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 22 min on an average January day.

The nearest other city in this atlas is Saquarema (13 km away). In January its highs average 28.3°C, 0.8°C warmer than Araruama, with 120 mm of rain.

Among the 448 cities listed in Brazil, Araruama ranks joint 303rd of 448 for the warmest January highs and joint 143rd of 448 for the driest January (rainfall, lowest first). The mean January high of those 448 cities is 28.5°C; Araruama is 1.0°C cooler than that mean.

From January to February, average highs rise by 0.5°C to 28.0°C, and monthly rainfall falls from 178 mm to 128 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

Araruama climate table

1991–2020

Monthly climate averages for Araruama, 1991–2020
Month	Average highHigh / low	Average low	Rainfall mm/month	Rain days ≥1 mm/day	Daylight hours/dayDaylight h/day
January, selected	27.5°C23.6°C	23.6°C	178	15.5	13.413 h
February	28.0°C23.9°C	23.9°C	128	11.7	12.913 h
March	27.2°C23.6°C	23.6°C	162	16.1	12.212 h
April	26.1°C22.5°C	22.5°C	85	11.6	11.612 h
May	24.2°C20.5°C	20.5°C	73	10.7	11.011 h
June	23.6°C19.5°C	19.5°C	43	6.9	10.811 h
July	23.2°C18.9°C	18.9°C	45	7.6	10.911 h
August	23.4°C19.1°C	19.1°C	42	7.2	11.311 h
September	23.9°C19.7°C	19.7°C	74	9.9	11.912 h
October	24.6°C20.7°C	20.7°C	94	11.1	12.613 h
November	25.2°C21.5°C	21.5°C	172	15.9	13.213 h
December	26.6°C22.9°C	22.9°C	189	16.8	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

Distance from Araruama

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