Iaçu Weather in December

NASA POWER reanalysis for the half-degree grid cell around Iaçu, 1991-2020; a grid cell is an area average and can differ from a thermometer in town by several degrees

Average highs run from 32°C on December 1 to 33°C on December 31, and lows from 20°C to 20°C. Normal precipitation for the month is 74 mm over about 9 wet days.

December day by day

The normal high and low for each date, in °C.

Normal low
Normal high
Reanalysis extreme high
Reanalysis extreme low

December at a glance

Average high: 32°C
Average low: 20°C
Precipitation: 74 mm
Reanalysis high: 38°CDec 18, 2012
Reanalysis low: 16°CDec 17, 2018
Daylight: 12 h 50 min to 12 h 52 min
Cloud cover: 60%
Humidity: 71%
Dew point: 18°C
Wind: 13.3 km/h

Every day of the month

A wet day has at least 1 mm of precipitation in the reanalysis.

Date	Normal high	Normal low	Reanalysis high	Reanalysis low	Chance wet
Dec 1	32°C	20°C	36°C 2019	17°C 2014	39%
Dec 2	32°C	20°C	36°C 2003	18°C 1994	38%
Dec 3	32°C	20°C	37°C 2015	17°C 1996	37%
Dec 4	32°C	20°C	37°C 2015	17°C 1995	37%
Dec 5	32°C	20°C	38°C 2015	18°C 2005	37%
Dec 6	32°C	20°C	37°C 2002	17°C 1992	36%
Dec 7	32°C	20°C	37°C 2015	18°C 1991	36%
Dec 8	32°C	20°C	37°C 2015	18°C 1997	36%
Dec 9	32°C	20°C	37°C 2009	17°C 1997	36%
Dec 10	32°C	20°C	37°C 2016	18°C 1992	36%
Dec 11	32°C	20°C	37°C 2015	17°C 2001	35%
Dec 12	32°C	20°C	37°C 2015	17°C 2001	35%
Dec 13	32°C	20°C	36°C 2015	16°C 2007	36%
Dec 14	32°C	20°C	37°C 2009	18°C 2018	36%
Dec 15	32°C	20°C	36°C 2012	18°C 2011	35%
Dec 16	32°C	20°C	37°C 2015	18°C 2017	34%
Dec 17	32°C	20°C	38°C 2012	16°C 2018	34%
Dec 18	32°C	20°C	38°C 2012	18°C 2011	33%
Dec 19	32°C	20°C	37°C 2012	17°C 1995	33%
Dec 20	32°C	20°C	36°C 2012	17°C 1995	32%
Dec 21	32°C	20°C	37°C 2012	17°C 1991	31%
Dec 22	32°C	20°C	37°C 2002	17°C 2005	31%
Dec 23	32°C	20°C	36°C 2002	18°C 1992	31%
Dec 24	32°C	20°C	36°C 2002	18°C 1992	30%
Dec 25	32°C	20°C	36°C 2006	18°C 1992	29%
Dec 26	32°C	20°C	37°C 2012	18°C 1998	28%
Dec 27	32°C	20°C	37°C 2012	17°C 2007	27%
Dec 28	32°C	20°C	37°C 2012	18°C 1999	28%
Dec 29	33°C	20°C	35°C 2017	18°C 2014	28%
Dec 30	33°C	20°C	37°C 1993	18°C 2008	30%
Dec 31	33°C	20°C	37°C 1993	18°C 1992	29%

Chance of rain

Chance of a wet day

Sunrise and sunset

Times for 2026, local time (GMT-3).

December 1: sunrise 5:05 AM, sunset 5:55 PM
December 31: sunrise 5:18 AM, sunset 6:10 PM

Every day of December: sun and moon

Other months

Sources

Cloud, humidity, wind and sunshine, and temperature and precipitation: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.