Santarém weather in December
In December, Santarém has daytime highs averaging 30 °C, nights around 26 °C, with 21 wet days. Figures are 1991–2020 climate normals.
- 29.9°C Average high
- 25.6°C Average low
- 21days Wet days
- 233mm Rainfall
- 12h Daylight
Daily temperatures through December
How December develops
Averages for the first, middle and last part of the month, from daily 1991–2020 normals. Chance of rain is the share of years in which that calendar day recorded more than 1 mm.
| Days | Avg high | Avg low | Chance of rain |
|---|---|---|---|
| 1–10 December | 30.5 °C | 26.1 °C | 51 % |
| 11–20 December | 29.9 °C | 25.6 °C | 72 % |
| 21–31 December | 29.4 °C | 25.2 °C | 76 % |
- Average highs fall from 30.5 °C early in December to 29.4 °C by the end of it.
- Rain is most likely over days 21–31 of December (76 % of days) and least likely over days 1–10 (51 %).
What to expect
| Measure | Typical December | Share of the month |
|---|---|---|
| Days above 25 °C | 31 of 31 | 100 % |
| Days above 30 °C | 15 of 31 | 48 % |
| Days below 0 °C | 0 of 31 | 0 % |
| Days with more than 1 mm rain | 21 of 31 | 67 % |
Conditions in December
| Measure | Average |
|---|---|
| Mean temperature | 28 °C |
| Record high (1991–2020) | 33 °C |
| Record low (1991–2020) | 23 °C |
| Relative humidity | 78 % |
| Wind speed | 14 km/h |
| Cloud cover | 74 % |
December compared with the months around it
| Month | Avg high | Rainfall | Cloud |
|---|---|---|---|
| January | 28.7 °C | 413 mm | 82 % |
| February | 28.4 °C | 400 mm | 86 % |
| October | 31.4 °C | 107 mm | 59 % |
| November | 30.7 °C | 156 mm | 71 % |
| December | 29.9 °C | 233 mm | 74 % |
See all twelve months for Santarém
- December is the 5th warmest month here.
- It is the 7th driest month of the year.
- It ranks 7th for least cloud cover.
- Days last about 12 hours from sunrise to sunset.
- It rains on 21 of 31 days — 67 % of the month.
- Nights are about 4.3 °C cooler than the middle of the day.
- The hottest December day on record since 1991 reached 33 °C, 3.4 °C above the usual daytime high.
QuestionsDecember in Santarém, answered
How warm is Santarém in December?
Daily highs average 30 °C and nights fall to about 26 °C, a spread of 4.3 °C between afternoon and dawn. That makes December the 5th warmest month of the year here.
Does it rain much in Santarém in December?
December averages 233 mm of rain, spread over about 21 of the 31 days — 67 % of the month. Cloud cover averages 74 % of the sky.
How long are the days in December?
Santarém averages 12 hours between sunrise and sunset in December. Day length is computed from latitude and date, so it is exact rather than modelled — but it says nothing about how much of that time is sunny.
Data sources and method
- ERA5 / ERA5-Land reanalysis — Copernicus Climate Change Service (C3S), ECMWF. Copernicus Licence
- Open-Meteo — Open-Meteo.com. CC BY 4.0
- NOAA OISST v2.1 — NOAA Physical Sciences Laboratory. Public domain
- GeoNames — GeoNames.org. CC BY 4.0
- Normal period
- 1991–2020
- Dataset version
- era5-1991-2020-scores1.1
- Last processed
Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: daylight hours, beach and comfort scores, monthly rankings, threshold day counts, chance of a wet day by date, ten-day averages within the month. Full formulas are on the methodology page.
Contains modified Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.