SeasonMapBarreirinhas (Lençóis Maranhenses) weather in December
Brazil
December in Barreirinhas: hot, a little rain, with clean air — a good time to visit.
#8 of 12 months in Barreirinhas · #860 of 1383 destinations to visit in December · comfort 64/100 (tier C)
Updated September 2026 · climate normals from ERA5 reanalysis
Traveller notes on Barreirinhas in December
No notes yet. Open Barreirinhas on the map to add the first one.
Barreirinhas climate normals — December
| Daytime high | 31°C / 89°F | 🥵 hot |
|---|---|---|
| Nighttime low | 26°C / 79°F | |
| Sea temperature | 29°C / 84°F | ♨️ bath-warm |
| Rainfall | 36 mm / 1.4 in | 🌦 some rain |
| Rainy days | 8 days | |
| Humidity | 75% | 💦 very humid |
| Dew point | 23°C / 73°F | |
| Sunshine | 11 h/day | |
| Daylight | 12.3 h | |
| Wind | 22 km/h / 13 mph | |
| Air quality (US AQI) | 28 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Barreirinhas in December
How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.
BusySummer holidays in Brazil, school holidays in 3 of the markets that fill it(estimated)
Peak crowdsBusyShoulder seasonQuiet
Best months for Barreirinhas's weather
Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).
Fair weatherBarreirinhas's weather peaks June–August.
Best weatherFair weatherToughest weather
What's on in Barreirinhas in December
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Season
Dunes without water
15 Nov – 28 Feb · usuallyOff-season shutdownBetween the last lagoons drying out and the new rains filling them the dunes are bare sand — a stranger, emptier place, and the months the agencies push the river and delta trips instead.
Where is Barreirinhas?
Barreirinhas in December — FAQ
- Is December a good time to visit Barreirinhas?
- December in Barreirinhas: hot, a little rain, with clean air — a good time to visit. It ranks #8 of 12 months for Barreirinhas on SeasonMap's comfort score (64/100).
- What is the weather like in Barreirinhas in December?
- In December, Barreirinhas averages a daily high of 31.4°C and a low of 26°C, with about 35.9 mm of rain over roughly 8.2 rainy days.
- What is the air quality in Barreirinhas in December?
- Barreirinhas has a mean US Air Quality Index of about 28 in December.