Guyana's Low Coastal Plain Weather: Tropical, Wet & Vulnerable

Guyana's Low Coastal Plain (the 77 km strip where 90% of the population lives) has a tropical monsoon climate (Am) with distinct wet/dry cycles, high humidity, and increasing flood risk.

Temperature

• Year-round: 22-32°C (72-90°F). Little seasonal variation.
• Coastal moderation: Sea breezes reduce heat stress vs. interior.
• Night lows: Rarely below 20°C (68°F).

Rainfall: Two Wet Seasons

Annual Total: 2,000-3,000 mm (80-120 in) coast; up to 5,500 mm interior highlands.

Humidity & Wind

• RH: 75-90% year-round. Mould, corrosion, heat index.
• Winds: NE Trades (Dec-May), variable/light (Jun-Nov). Sea breeze diurnal cycle.

Natural Hazards

• Flooding: #1 risk. Low elevation (0.5-1m below high tide), poor drainage, high rainfall, spring tides, seawall overtopping. 2005, 2021, 2022 major events.
• Tropical Cyclones: Rare direct hits (south of main belt), but outer bands = extreme rain. 2021 Hurricane Elsa remnants = flooding.
• Drought: El Niño years (2015-16, 2023-24) — water rationing, agriculture loss.
• Sea Level Rise: 3-4 mm/yr. Seawall (1940s) aging. Georgetown = "sinking city."

Ecosystem Context

Mangroves (coastal buffer), swamps, savannas, rice/sugar cane. Biodiversity: jaguar, tapir, giant anteater, harpy eagle, 800+ birds. Kaieteur Falls (interior) — world's largest single-drop.

Climate Change Projection

Hotter (+1.5-3°C by 2100), wetter extremes, more intense floods, SLR 0.5-1m. Adaptation: drainage upgrades, mangrove restoration, early warning, planned relocation (controversial). Oil economy (Exxon 11B+ barrels) vs. climate vulnerability = Guyana's paradox.