Dominican Republic weather in December

Average highs across the country

20.2–30.2°C

Constanza coolest, Pedernales / Bahía de las Águilas warmest. No single national average is shown.

Wettest destination

124 mm

Miches / Playa Esmeralda, on about 19 wet days.

Driest destination

10 mm

Pedernales / Bahía de las Águilas, on about 1 wet days.

• Biggest change ahead: Punta Cana & the East moves 21 mm drier from December into January, while La Romana & Bayahibe moves only 1 mm.
• Punta Cana & the East: December averages 72.2 mm of rain across 5 destinations with records, on about 15 wet days. That is 40 mm less than November, and 21 mm above January.
• La Romana & Bayahibe: December averages 25 mm of rain across 2 destinations with records, on about 5.5 wet days. That is 28 mm less than November, and 1 mm above January.
• Santo Domingo & the South: December averages 41.5 mm of rain across 2 destinations with records, on about 9 wet days. That is 36 mm less than November, and 11 mm above January.
• Samaná Peninsula: December averages 63.3 mm of rain across 3 destinations with records, on about 15 wet days. That is 41 mm less than November, and 19 mm above January.
• North Coast: December averages 71 mm of rain across 4 destinations with records, on about 10.8 wet days. That is 16 mm less than November, and 15 mm above January.
• Mountains & the Cibao: December averages 57.3 mm of rain across 3 destinations with records, on about 12.7 wet days. That is 34 mm less than November, and 1 mm below January.
• The Southwest: December averages 16 mm of rain across 2 destinations with records, on about 2 wet days. That is 23 mm less than November, and 3 mm above January.

Nothing in this month’s climate table describes seaweed on a beach. Open the sargassum planner and set the month to December — it runs on its own live data layer and its own model version.

Source

Open-Meteo climate reanalysis and Copernicus ERA5-Land reanalysis — open-meteo.com and Copernicus ERA5-Land hourly time series

Baseline

30-year averages, 1995–2024

Climate version

climate-v1.1-1995-2024

• These are 30-year averages, 1995–2024, sampled at each destination's registry coordinates. They are NOT a WMO standard normal, and they are NOT a forecast.
• Celsius, rainfall and wet-day values are transcribed exactly as supplied. Fahrenheit is derived from Celsius, never supplied.
• 17 destinations: monthly values from Open-Meteo climate reanalysis, transcribed as supplied.
• 4 destinations (Jarabacoa, Constanza, Juan Dolio, Punta Rucia): computed by Transekur from Copernicus ERA5-Land hourly reanalysis (CC-BY 4.0), 1995–2024, aggregated over local Santo Domingo calendar days; a wet day is ≥ 1.0 mm.
• Values represent ~9 km reanalysis grid cells: Jarabacoa 19.1,-70.6; Constanza 18.9,-70.7; Juan Dolio 18.5,-69.4 (inland representative cell a few km from the beachfront — the coastal cell is ocean in this dataset); Punta Rucia 19.6,-71.3.
• Mountain grid cells can sit above town centers, so in-town temperatures can run warmer than the grid average. Reanalysis is modeled data, not station observations.
• Wet days for the 17 Open-Meteo destinations are days with measurable precipitation as supplied by that source; that baseline does not define a millimetre threshold, so none is stated for them.