Climate averages 1991–2020
Santa Maria weather
in December.
A hot, wet month: the 2nd warmest and the 10th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
December is a hot month in Santa Maria: daytime highs average 28.6°C and nights cool to about 18.2°C. By daytime temperature it is the 2nd warmest of the 12 months.
Expect about 158 mm of rain on roughly 12 days, which makes December a wet month (the 10th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 14 h 00 min on an average December day.
The nearest other city in this atlas is Cachoeira do Sul (96 km away). In December its highs average 28.7°C, about as warm as Santa Maria, with 132 mm of rain.
Among the 448 cities listed in Brazil, Santa Maria ranks joint 202nd of 448 for the warmest December highs and 155th of 448 for the driest December (rainfall, lowest first). The mean December high of those 448 cities is 28.5°C; Santa Maria is 0.1°C warmer than that mean.
From December to January, average highs rise by 0.5°C to 29.1°C, and monthly rainfall rises from 158 mm to 159 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
Santa Maria climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 29.1°C19.5°C | 19.5°C | 159 | 13.8 | 13.814 h |
| February | 28.4°C19.4°C | 19.4°C | 146 | 12.6 | 13.113 h |
| March | 27.1°C17.9°C | 17.9°C | 124 | 11.2 | 12.312 h |
| April | 24.1°C14.9°C | 14.9°C | 144 | 10.1 | 11.411 h |
| May | 20.3°C11.6°C | 11.6°C | 127 | 9.5 | 10.711 h |
| June | 18.4°C9.7°C | 9.7°C | 137 | 10.1 | 10.310 h |
| July | 17.8°C8.5°C | 8.5°C | 149 | 10.2 | 10.410 h |
| August | 20.2°C9.8°C | 9.8°C | 122 | 9.8 | 11.111 h |
| September | 21.2°C11.4°C | 11.4°C | 157 | 10.6 | 11.912 h |
| October | 23.6°C13.9°C | 13.9°C | 208 | 12.6 | 12.813 h |
| November | 26.0°C15.5°C | 15.5°C | 136 | 10.2 | 13.614 h |
| December, selected | 28.6°C18.2°C | 18.2°C | 158 | 11.8 | 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
- Cachoeira do Sul in DecemberBrazil · 96 kmHigh 28.7°C · Low 18.7°C · 132 mm rain
- Santa Cruz do Sul in DecemberBrazil · 133 kmHigh 28.3°C · Low 18.3°C · 152 mm rain
- Ijuí in DecemberBrazil · 145 kmHigh 28.8°C · Low 19.0°C · 178 mm rain
- Santo Ângelo in DecemberBrazil · 160 kmHigh 29.2°C · Low 19.4°C · 178 mm rain
- Lajeado in DecemberBrazil · 180 kmHigh 28.3°C · Low 18.3°C · 166 mm rain
- Bagé in DecemberBrazil · 185 kmHigh 27.5°C · Low 17.1°C · 117 mm rain
- Alegrete in DecemberBrazil · 192 kmHigh 29.5°C · Low 19.3°C · 136 mm rain
- Passo Fundo in DecemberBrazil · 209 kmHigh 26.0°C · Low 16.9°C · 178 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 Santa Maria) is explained once on the Santa Maria year overview and on the Sources, method and limits page.