Climate averages 1991–2020
Montevideo weather
in December.
A warm, moderately wet month: the 3rd warmest and the 2nd driest of the year. Meets the pleasant-weather rule
Long-term climate patterns, not a forecast for a particular trip.
December is a warm month in Montevideo: daytime highs average 23.7°C and nights cool to about 17.9°C. By daytime temperature it is the 3rd warmest of the 12 months.
Expect about 73 mm of rain on roughly 7 days, which makes December a moderately wet month (the 2nd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 14 h 27 min on an average December day.
The nearest other city in this atlas is Maldonado (113 km away). In December its highs average 22.7°C, 1.0°C cooler than Montevideo, with 68 mm of rain.
Among the 4 cities listed in Uruguay, Montevideo ranks 3rd of 4 for the warmest December highs and 2nd of 4 for the driest December (rainfall, lowest first). The mean December high of those 4 cities is 25.9°C; Montevideo is 2.1°C cooler than that mean.
From December to January, average highs rise by 1.5°C to 25.2°C, and monthly rainfall falls from 73 mm to 68 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
Montevideo climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 25.2°C19.6°C | 19.6°C | 68 | 5.9 | 14.214 h |
| February | 24.7°C19.6°C | 19.6°C | 92 | 7.8 | 13.413 h |
| March | 23.2°C18.3°C | 18.3°C | 97 | 7.9 | 12.312 h |
| April | 20.1°C15.5°C | 15.5°C | 107 | 8.3 | 11.211 h |
| May | 16.7°C12.6°C | 12.6°C | 87 | 7.9 | 10.310 h |
| June | 14.0°C9.8°C | 9.8°C | 90 | 8.6 | 9.910 h |
| July | 12.8°C8.5°C | 8.5°C | 96 | 8.9 | 10.010 h |
| August | 14.5°C9.5°C | 9.5°C | 97 | 8.5 | 10.811 h |
| September | 15.6°C10.6°C | 10.6°C | 92 | 8.3 | 11.812 h |
| October | 18.2°C13.1°C | 13.1°C | 111 | 8.7 | 12.913 h |
| November | 21.1°C15.4°C | 15.4°C | 101 | 7.7 | 13.914 h |
| December, selected | 23.7°C17.9°C | 17.9°C | 73 | 6.9 | 14.414 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
- Maldonado in DecemberUruguay · 113 kmHigh 22.7°C · Low 17.1°C · 68 mm rain
- Berisso in DecemberArgentina · 155 kmHigh 26.0°C · Low 18.4°C · 76 mm rain
- La Plata in DecemberArgentina · 161 kmHigh 26.1°C · Low 18.1°C · 82 mm rain
- Berazategui in DecemberArgentina · 185 kmHigh 26.1°C · Low 18.4°C · 81 mm rain
- Quilmes in DecemberArgentina · 190 kmHigh 26.6°C · Low 18.1°C · 81 mm rain
- Mar del Tuyú in DecemberArgentina · 191 kmHigh 22.0°C · Low 17.5°C · 65 mm rain
- Avellaneda in DecemberArgentina · 201 kmHigh 26.7°C · Low 18.5°C · 81 mm rain
- Buenos Aires in DecemberArgentina · 203 kmHigh 26.3°C · Low 18.6°C · 87 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 Montevideo) is explained once on the Montevideo year overview and on the Sources, method and limits page.