Climate averages 1991–2020
Santarém weather
in December.
A hot, very wet month: the 5th warmest and the 7th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
December is a hot month in Santarém: daytime highs average 29.9°C and nights cool to about 25.7°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 233 mm of rain on roughly 22 days, which makes December a very wet month (the 7th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 16 min on an average December day.
The nearest other city in this atlas is Oriximiná (149 km away). In December its highs average 30.2°C, about as warm as Santarém, with 211 mm of rain.
Among the 448 cities listed in Brazil, Santarém ranks joint 103rd of 448 for the warmest December highs and joint 343rd of 448 for the driest December (rainfall, lowest first). The mean December high of those 448 cities is 28.5°C; Santarém is 1.4°C warmer than that mean.
From December to January, average highs fall by 1.3°C to 28.6°C, and monthly rainfall rises from 233 mm to 409 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
Santarém climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 28.6°C24.7°C | 24.7°C | 409 | 28.2 | 12.212 h |
| February | 28.3°C24.5°C | 24.5°C | 391 | 26.1 | 12.212 h |
| March | 28.3°C24.5°C | 24.5°C | 488 | 29.3 | 12.112 h |
| April | 28.2°C24.5°C | 24.5°C | 450 | 29.2 | 12.112 h |
| May | 28.3°C24.6°C | 24.6°C | 365 | 29.6 | 12.012 h |
| June | 28.5°C24.8°C | 24.8°C | 187 | 24.8 | 12.012 h |
| July | 28.9°C25.0°C | 25.0°C | 114 | 19.2 | 12.012 h |
| August | 30.2°C25.7°C | 25.7°C | 74 | 13.0 | 12.012 h |
| September | 31.2°C26.2°C | 26.2°C | 68 | 10.5 | 12.112 h |
| October | 31.4°C26.5°C | 26.5°C | 107 | 11.9 | 12.212 h |
| November | 30.7°C26.2°C | 26.2°C | 149 | 16.6 | 12.212 h |
| December, selected | 29.9°C25.7°C | 25.7°C | 233 | 21.7 | 12.312 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
- Oriximiná in DecemberBrazil · 149 kmHigh 30.2°C · Low 25.0°C · 211 mm rain
- Parintins in DecemberBrazil · 226 kmHigh 30.0°C · Low 24.4°C · 245 mm rain
- Itaituba in DecemberBrazil · 248 kmHigh 30.3°C · Low 23.9°C · 209 mm rain
- Altamira in DecemberBrazil · 290 kmHigh 30.4°C · Low 23.8°C · 152 mm rain
- Itacoatiara in DecemberBrazil · 422 kmHigh 29.4°C · Low 24.8°C · 268 mm rain
- Santana in DecemberBrazil · 475 kmHigh 30.4°C · Low 24.3°C · 105 mm rain
- Breves in DecemberBrazil · 477 kmHigh 31.6°C · Low 24.4°C · 125 mm rain
- Macapá in DecemberBrazil · 490 kmHigh 30.1°C · Low 24.3°C · 128 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 Santarém) is explained once on the Santarém year overview and on the Sources, method and limits page.