Oeiras Weather in December
What's the weather like in Oeiras (Piauí) in December 2025?
The climate in Oeiras during December can be summarized as very hot and damp.
December is in the summer in Oeiras and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a warm 34°C (92°F), whilst at night 23°C (73°F) is normal.
| Daytime temperature | 33.5°C 92.2°F |
|---|---|
| Nightly temperature | 23°C 73.3°F |
| Average temperature | 28.2°C 82.8°F |
| Daily sunshine | 6.8 hrs |
| Avg rainfall | 119 mm 4.7 ins |
| Rainy days | 15 days |
| Sea temperature | 27°C 80.5°F |
| Humidity | 63% |
| Windspeed | 10.8kph 7 mph |
On average December is the 4th wettest month of the year in Oeiras with around 119mm 4.7 inches of rain making it a damp time to visit. This rainfall is typically spread over 15 days, although this may vary considerably.
On the flip side this corresponds to an average of 6.8 hours of sunshine per day.
December temperatures in Oeiras
December rainfall
December hourly sunshine
The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Oeiras in December 2025.
Other monthly averages
Best places to visit in December
Oeiras weather stats
| Hottest month: | September | 35.6°C 96.1°F |
|---|---|---|
| Driest month: | August | 1mm 0ins |
| Sunniest month: | August | 10hrs |
| Coldest month: | March | 31.1°C 88°F |
| Wettest month: | March | 177mm 7ins |
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