Climate averages 1991–2020
Rivera weather
in December.
A hot, wet month: the 2nd warmest and the joint 5th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
December is a hot month in Rivera: daytime highs average 28.2°C and nights cool to about 17.9°C. By daytime temperature it is the 2nd warmest of the 12 months.
Expect about 117 mm of rain on roughly 10 days, which makes December a wet month (the joint 5th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 14 h 06 min on an average December day.
The nearest other city in this atlas is Sant'Ana do Livramento (2 km away). In December its highs average 28.1°C, about as warm as Rivera, with 117 mm of rain.
Among the 4 cities listed in Uruguay, Rivera ranks 2nd of 4 for the warmest December highs and 3rd of 4 for the driest December (rainfall, lowest first). The mean December high of those 4 cities is 25.9°C; Rivera is 2.3°C warmer than that mean.
From December to January, average highs rise by 0.9°C to 29.1°C, and monthly rainfall rises from 117 mm to 133 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
Rivera climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 29.1°C19.4°C | 19.4°C | 133 | 10.7 | 13.914 h |
| February | 28.1°C19.1°C | 19.1°C | 129 | 10.5 | 13.213 h |
| March | 26.6°C17.5°C | 17.5°C | 107 | 9.4 | 12.312 h |
| April | 23.2°C14.7°C | 14.7°C | 143 | 9.0 | 11.411 h |
| May | 19.3°C11.5°C | 11.5°C | 110 | 8.3 | 10.611 h |
| June | 17.1°C9.3°C | 9.3°C | 124 | 8.7 | 10.210 h |
| July | 16.5°C8.3°C | 8.3°C | 108 | 8.1 | 10.310 h |
| August | 18.8°C9.4°C | 9.4°C | 105 | 8.2 | 11.011 h |
| September | 20.0°C10.7°C | 10.7°C | 131 | 9.4 | 11.912 h |
| October | 22.6°C13.3°C | 13.3°C | 161 | 10.9 | 12.813 h |
| November | 25.4°C15.1°C | 15.1°C | 117 | 8.3 | 13.714 h |
| December, selected | 28.2°C17.9°C | 17.9°C | 117 | 9.8 | 14.114 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
- Sant'Ana do Livramento in DecemberBrazil · 2 kmHigh 28.1°C · Low 17.6°C · 117 mm rain
- Alegrete in DecemberBrazil · 127 kmHigh 29.5°C · Low 19.3°C · 136 mm rain
- Bagé in DecemberBrazil · 145 kmHigh 27.5°C · Low 17.1°C · 117 mm rain
- Uruguaiana in DecemberBrazil · 195 kmHigh 29.8°C · Low 20.1°C · 136 mm rain
- Santa Maria in DecemberBrazil · 216 kmHigh 28.6°C · Low 18.2°C · 158 mm rain
- Concordia in DecemberArgentina · 241 kmHigh 29.3°C · Low 19.1°C · 115 mm rain
- Cachoeira do Sul in DecemberBrazil · 272 kmHigh 28.7°C · Low 18.7°C · 132 mm rain
- Paysandú in DecemberUruguay · 286 kmHigh 28.8°C · Low 18.0°C · 118 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 Rivera) is explained once on the Rivera year overview and on the Sources, method and limits page.
Sant'Ana do Livramento lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.