Climate of the Dominican Republic: Tropical, Two Zones, Hurricane Aware

The Dominican Republic (eastern 2/3 of Hispaniola) enjoys a tropical maritime climate moderated by trade winds and topography.

Two Main Climate Zones

1. Tropical Savanna (Aw) — Most of the country (lowlands, coasts, Cibao Valley):
   • Avg annual temp: 24–27°C (75–81°F).
   • Distinct seasons: Wet (May–Nov, peak May–Jul & Sep–Oct); Dry (Dec–Apr, peak Feb–Mar).
   • Annual rainfall: 750–1,500 mm (30–60"), varies by rain shadow.
2. Tropical Monsoon (Am) — Northeast (Samaná Peninsula, Nagua, Miches):
   • Similar temps (25–27°C / 77–81°F).
   • No true dry month — rain every month, less seasonal contrast.
   • Annual rainfall: 1,250–2,500 mm (50–100"). Lush rainforest.

Key Climate Drivers

• Northeast Trade Winds: Constant moisture feed from Atlantic.
• Orographic Lift: Cordillera Central (Pico Duarte 3,098 m) forces rain on windward (north/east) slopes; rain shadow south/west.
• Hurricane Season (Jun–Nov, peak Aug–Oct): DR on southern fringe of main belt. Direct hits infrequent (David 1979, Georges 1998, Fiona 2022) but indirect impacts (flooding, surge) common.
• Microclimates: Jaragua (arid SW), Constanza (cool highland, "Dominican Alps"), Lake Enriquillo (hypersaline, below sea level).

Travel Implications

• Peak Season (Dec–Apr): Dry, sunny, 25–29°C — highest prices.
• Shoulder (May–Jun, Nov): Good weather, fewer crowds, lower prices.
• Summer/Fall (Jul–Oct): Hotter, humid, afternoon storms, hurricane watch — best deals.

Pack light layers, rain jacket, reef-safe sunscreen. Monitor NHC during hurricane season.