Climate averages 1991–2020
Uruguaiana weather
in December.
A hot, wet month: the 2nd warmest and the joint 8th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
December is a hot month in Uruguaiana: daytime highs average 29.8°C and nights cool to about 20.1°C. By daytime temperature it is the 2nd warmest of the 12 months.
Expect about 136 mm of rain on roughly 9 days, which makes December a wet month (the joint 8th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 14 h 01 min on an average December day.
The nearest other city in this atlas is Alegrete (125 km away). In December its highs average 29.5°C, about as warm as Uruguaiana, with 136 mm of rain.
Among the 448 cities listed in Brazil, Uruguaiana ranks joint 109th of 448 for the warmest December highs and joint 124th of 448 for the driest December (rainfall, lowest first). The mean December high of those 448 cities is 28.5°C; Uruguaiana is 1.3°C warmer than that mean.
From December to January, average highs rise by 0.8°C to 30.6°C, and monthly rainfall rises from 136 mm to 139 mm.
The annual picture
December 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
Uruguaiana climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 30.6°C21.6°C | 21.6°C | 139 | 10.4 | 13.814 h |
| February | 29.6°C21.0°C | 21.0°C | 128 | 10.4 | 13.113 h |
| March | 28.0°C19.3°C | 19.3°C | 124 | 9.2 | 12.312 h |
| April | 24.6°C16.3°C | 16.3°C | 177 | 9.3 | 11.411 h |
| May | 20.7°C13.1°C | 13.1°C | 115 | 8.0 | 10.611 h |
| June | 18.4°C10.9°C | 10.9°C | 113 | 8.5 | 10.310 h |
| July | 17.8°C9.7°C | 9.7°C | 103 | 7.5 | 10.410 h |
| August | 20.4°C11.1°C | 11.1°C | 89 | 7.8 | 11.111 h |
| September | 22.0°C12.6°C | 12.6°C | 126 | 9.0 | 11.912 h |
| October | 24.6°C15.4°C | 15.4°C | 189 | 10.9 | 12.813 h |
| November | 27.3°C17.4°C | 17.4°C | 136 | 8.4 | 13.614 h |
| December, selected | 29.8°C20.1°C | 20.1°C | 136 | 9.4 | 14.014 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
December in nearby cities
- Alegrete in DecemberBrazil · 125 kmHigh 29.5°C · Low 19.3°C · 136 mm rain
- Rivera in DecemberUruguay · 195 kmHigh 28.2°C · Low 17.9°C · 117 mm rain
- Sant'Ana do Livramento in DecemberBrazil · 196 kmHigh 28.1°C · Low 17.6°C · 117 mm rain
- Concordia in DecemberArgentina · 203 kmHigh 29.3°C · Low 19.1°C · 115 mm rain
- Goya in DecemberArgentina · 221 kmHigh 29.9°C · Low 20.9°C · 148 mm rain
- Ituzaingó in DecemberArgentina · 244 kmHigh 30.6°C · Low 22.3°C · 166 mm rain
- Reconquista in DecemberArgentina · 257 kmHigh 30.0°C · Low 20.7°C · 149 mm rain
- Posadas in DecemberArgentina · 286 kmHigh 30.3°C · Low 21.5°C · 163 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 Uruguaiana) is explained once on the Uruguaiana year overview and on the Sources, method and limits page.