Weather in Costa Rica in September

Weather in Costa Rica in September

In Costa Rica, September typically brings warm temperatures mixed with significant rainfall. While daytime may experience sunshine, expect bursts of heavy rain, particularly in the afternoons. Humidity levels remain high, making the weather feel quite tropical. Despite the rain, outdoor exploration can still be enjoyable, especially amidst lush rainforests coming alive after the rains, with beautiful local festivals celebrating the season.

September Climate Overview

• Average Temperature: 21-30°C (70-86°F)
• Rainfall: 300-400 mm
• Sunshine Hours: 5 hours per day
• Humidity: 85%
• Wind Speed: 10-15 km/h

What to Expect in September

Daytime Conditions

Daytime in Costa Rica during September feels warm and humid, with temperatures often reaching highs of around 30°C (86°F). The sun intermittently peeks through the clouds, offering a mix of sunshine and the promise of rain later in the day.

Rainfall Patterns

Rainfall in September tends to be heavy but not continuous, with frequent afternoon showers. These showers can be intense but usually occur for short periods, affecting outdoor plans only slightly if you plan accordingly.

Evening Conditions

Evenings cool down slightly, with a refreshing breeze easing the humidity. Temperatures drop to around 21°C (70°F), making outdoor activities like dining or walking pleasantly comfortable.

Best Activities in Costa Rica in September

• Outdoor Activities: Enjoy hiking in the refreshed rainforests, sightseeing at waterfalls, and exploring local farmers’ markets.
• Seasonal Highlights: Experience the lush greenery of the landscapes and participate in cultural festivals occurring in September.
• Water-based or Nature-based Activities: River rafting and wildlife tours are perfect, taking advantage of the newly thriving flora and fauna.

What to Pack for September

• Light clothing suitable for warm daytime and slightly cooler evenings
• Protection from sun and rain, such as a hat, sunscreen, and an umbrella
• Footwear appropriate for terrain, like hiking boots or comfortable walking shoes
• A reusable water bottle to stay hydrated