Climate averages 1991–2020
Gualeguaychú weather
in December.
A hot, wet month: the 2nd warmest and the 11th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
December is a hot month in Gualeguaychú: daytime highs average 28.6°C and nights cool to about 18.3°C. By daytime temperature it is the 2nd warmest of the 12 months.
Expect about 128 mm of rain on roughly 9 days, which makes December a wet month (the 11th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 14 h 17 min on an average December day.
The nearest other city in this atlas is Paysandú (87 km away). In December its highs average 28.8°C, about as warm as Gualeguaychú, with 118 mm of rain.
Among the 67 cities listed in Argentina, Gualeguaychú ranks 29th of 67 for the warmest December highs and joint 52nd of 67 for the driest December (rainfall, lowest first). The mean December high of those 67 cities is 27.9°C; Gualeguaychú is 0.7°C warmer than that mean.
From December to January, average highs rise by 1.3°C to 29.9°C, and monthly rainfall falls from 128 mm to 110 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
Gualeguaychú climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 29.9°C20.1°C | 20.1°C | 110 | 7.7 | 14.114 h |
| February | 28.3°C19.3°C | 19.3°C | 117 | 8.1 | 13.313 h |
| March | 26.4°C17.5°C | 17.5°C | 121 | 8.0 | 12.312 h |
| April | 22.7°C14.2°C | 14.2°C | 130 | 7.9 | 11.311 h |
| May | 18.9°C11.1°C | 11.1°C | 80 | 6.1 | 10.410 h |
| June | 16.2°C8.3°C | 8.3°C | 69 | 6.5 | 10.010 h |
| July | 15.4°C7.2°C | 7.2°C | 64 | 6.0 | 10.210 h |
| August | 17.9°C8.5°C | 8.5°C | 87 | 6.5 | 10.911 h |
| September | 19.7°C10.1°C | 10.1°C | 87 | 7.0 | 11.912 h |
| October | 22.5°C13.1°C | 13.1°C | 124 | 9.8 | 12.913 h |
| November | 25.8°C15.6°C | 15.6°C | 104 | 6.9 | 13.814 h |
| December, selected | 28.6°C18.3°C | 18.3°C | 128 | 8.6 | 14.314 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
- Paysandú in DecemberUruguay · 87 kmHigh 28.8°C · Low 18.0°C · 118 mm rain
- Zárate in DecemberArgentina · 130 kmHigh 28.0°C · Low 17.4°C · 104 mm rain
- Campana in DecemberArgentina · 135 kmHigh 28.1°C · Low 17.3°C · 99 mm rain
- San Nicolás de los Arroyos in DecemberArgentina · 162 kmHigh 28.4°C · Low 18.6°C · 108 mm rain
- Pilar in DecemberArgentina · 165 kmHigh 27.9°C · Low 17.2°C · 93 mm rain
- Don Torcuato in DecemberArgentina · 166 kmHigh 27.1°C · Low 18.0°C · 92 mm rain
- José C. Paz in DecemberArgentina · 169 kmHigh 27.7°C · Low 17.3°C · 92 mm rain
- San Miguel, Argentina in DecemberArgentina · 172 kmHigh 27.4°C · Low 17.5°C · 92 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 Gualeguaychú) is explained once on the Gualeguaychú year overview and on the Sources, method and limits page.