Climate & Weather in Cozumel

Good to Know

• Best overall months: March–April combine warm, sunny weather with the lowest rainfall (3–4 rainy days per month) and are ideal for diving and outdoor activities
• Worst months: September–October peak hurricane season with heaviest rainfall (up to 245 mm/10 inches in October) and highest storm risk, though direct hits on Cozumel are historically rare
• Hurricane season (June–November): rainfall increases, humidity peaks, but most rain falls as brief afternoon showers rather than all-day events; water visibility remains excellent for diving on calm days
• Shoulder season (May, November): fewer crowds, lower prices, decent weather; May offers particularly good value with dry-season conditions and off-season rates
• Peak season (December–February): cooler, dry, perfect for diving, but high tourist traffic and premium prices; January–March have the clearest underwater visibility (200+ feet reported)
• Year-round water temperature ranges 26–29°C (79–84°F), warm enough for snorkeling without a wetsuit during peak seasons
• High humidity is present year-round; even 'dry season' humidity ranges 78–87%, with September reaching peak humidity
• No winter cold fronts or seasonal variations in the sense of temperate zones—always warm, with only slight month-to-month temperature swings (5°C (41°F)/9°F difference between coldest and warmest months)