União Weather in December
What's the weather like in União (Piauí) in December 2025?
The climate in União during December can be summarized as very hot and damp.
December is in the summer in União and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a warm 34°C (93°F), whilst at night 23°C (74°F) is normal.
| Daytime temperature | 33.7°C 92.7°F |
|---|---|
| Nightly temperature | 23.1°C 73.6°F |
| Average temperature | 28.4°C 83.1°F |
| Daily sunshine | 7 hrs |
| Avg rainfall | 109 mm 4.3 ins |
| Rainy days | 14 days |
| Sea temperature | 27.4°C 81.3°F |
| Humidity | 67% |
| Windspeed | 11.5kph 7 mph |
On average December is the 6th wettest month of the year in União with around 109mm 4.3 inches of rain making it a damp time to visit. This rainfall is typically spread over 14 days, although this may vary considerably.
On the flip side this corresponds to an average of 7 hours of sunshine per day.
December temperatures in União
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 União in December 2025.
Other monthly averages
Best places to visit in December
União weather stats
| Hottest month: | October | 35°C 95°F |
|---|---|---|
| Driest month: | August | 10mm 0.4ins |
| Sunniest month: | August | 9.9hrs |
| Coldest month: | February | 30.7°C 87.3°F |
| Wettest month: | March | 362mm 14.3ins |
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