Boa-Vista-island-weather-and-wind

Boa Vista Island: Weather, Wind & Ocean Guide

Year-round sunshine, Passat trade winds, and Atlantic ocean conditions.

At a Glance: Quick Overview

Average Temperature Range: 22°C – 29°C.

Annual Sunny Days: More than 330.

Peak Wind Season: November – April.

Water Temperature Range: 21°C – 27°C.

Section 1: Climate Overview: Year-Round Weather Patterns

Boa Vista sits in the Atlantic roughly 450 km off the West African coast, close enough to the Sahara to share its dryness and its dust. The result is a climate with very little seasonal drama: warm all year, dry almost all year, and shaped far more by wind than by rain.

Air Temperature Profile

Winter & Spring: Mild and Breezy. From November through April, daytime temperatures typically sit in the low-to-mid twenties, with plenty of sunshine. The constant trade winds make the air feel fresher than the thermometer suggests, which is comfortable for walking and sightseeing but noticeable once you step out of the sun or the sun goes down.

Summer & Autumn: Warmest and Most Humid. From roughly June through October, temperatures climb toward the high twenties, the wind eases, and humidity rises. This is when the island feels genuinely tropical rather than desert-fresh, and when both the air and the ocean are at their warmest.

Rainfall & Dry Climate Reality

An Arid, Semi-Desert Island. Boa Vista is flat, sandy, and arid, with no mountains high enough to pull moisture out of the passing air. Rainfall is minimal across the year, vegetation is sparse, and more than 330 days of sunshine are typical. Practically speaking, you can plan a holiday here without ever seriously factoring in rain.

The Brief Rain Period (August – October). What little rain does fall arrives in the late summer and early autumn, usually as short, heavy showers rather than days of grey weather. Showers pass quickly, and the sun generally returns within hours. This is also the period when a rare tropical system can pass through the region, which is worth knowing when booking but is not a common occurrence.

Section 2: Seasonal Breakdown & Best Time to Visit

There is no bad month on Boa Vista, but there are very different months. The wind decides most of it.

Winter / Spring (November – April)

Temperature & Humidity. Comfortable, dry warmth with low humidity. Days are pleasant for beach time and excursions, and the air rarely feels heavy. This is the classic winter-sun window for European travelers.

Wind Strength & Watersports. This is the peak of the Northeast trade winds, with reliable, strong conditions for kitesurfing and windsurfing. The same wind that makes riders happy also blows sand along exposed beaches and makes evenings feel cool, so a light jacket belongs in your case.

Saharan Harmattan Dust Haze. During the winter months, dust carried from the Sahara can give the sky a milky, hazy appearance for days at a time. The sun still burns through it, so the haze is deceptive rather than protective.

Summer (May – July)

Moderate Winds & Rising Temperatures. The trade winds gradually ease, temperatures climb, and the sea begins to warm noticeably. Conditions turn friendlier for swimming, snorkeling, and boat trips, while still offering enough wind for watersports at the start of this period.

The Start of Turtle Nesting Season. From around June and July, female Loggerhead turtles begin coming ashore at night to lay their eggs on Boa Vista's beaches. The nesting season builds through the summer, making this the beginning of the island's most remarkable wildlife window.

Late Summer / Autumn (August – October)

Peak Warmth & Calmer Winds. These are the warmest, calmest months, with the lightest winds of the year and the warmest ocean temperatures. Beach days feel tropical, and the sea is at its most inviting.

Short Rainfall Window & Ocean Warmth. The brief rain period falls in these months, usually as passing showers. Humidity is at its highest, and the combination of warm water and calm conditions makes this the best stretch of the year for swimming, snorkeling, and boat excursions. It also covers the heart of turtle nesting and the start of hatching.

Section 3: Wind & Trade Wind Guide

Wind is the defining feature of Boa Vista's climate. Understanding where it comes from and what it carries explains almost everything about how the island feels.

The Northeast Trade Winds (Passat)

Origin & Seasonal Force. The Northeast trade winds, known in Portuguese as the ventos alísios and in German as the Passat, blow steadily across the Atlantic from the northeast. They are strongest and most consistent from November through April and ease through the summer months. Because Boa Vista is flat, the wind reaches the coast largely undisturbed.

Best Spots for Kitesurfing & Windsurfing. The main watersports areas are Praia de Chaves and the bay at Sal Rei, where the wind angle and the open space suit both kitesurfing and windsurfing. Boa Vista's appeal for riders lies in the space: far fewer people on the water than at the established hubs, but also fewer schools and less rescue infrastructure.

The Harmattan Wind & Saharan Dust

What It Is & How It Affects Visibility. The Harmattan is a dry, dusty wind that carries fine Saharan sand out over the Atlantic during the winter months. When it reaches Cape Verde, the sky turns milky and hazy, distant horizons blur, and the light flattens. Heavy dust events can also disrupt flight schedules, though this is occasional rather than routine.

Protection Tips. The dust is fine enough to work into everything. Keep cameras and phones in a bag between shots and avoid changing lenses in the open. Pack lubricating eye drops and wraparound sunglasses, especially if you wear contact lenses, and bring a buff or bandana for desert excursions. Most importantly, keep applying sunscreen: hazy skies filter the light but not the UV, and visitors regularly get burned on days that looked overcast.

Section 4: Ocean Conditions, Currents & Swimming Safety

Boa Vista's beaches are magnificent, but the Atlantic here is genuinely powerful. This is the section worth reading twice.

Atlantic Swells & Wave Dynamics

Coastal Exposure. The north and west coasts take the full force of Atlantic swell and wind, producing strong shore breaks, currents, and undertows on the open beaches. Southern and sheltered stretches are calmer, since headlands and the island's own bulk block both wind and waves.

The Red Flag System. Resort beaches use a color-coded flag system to signal conditions. A green flag means calm water and safe swimming, a yellow flag means caution because of currents, wind, or choppy swell, and a red flag means swimming is prohibited. Red flags are common on Boa Vista's open beaches, and they are not a formality. When the flag is red, stay out of the water, regardless of how strong a swimmer you are.

Safest Swimming & Water Access Areas

Sheltered Bays. The bay at Sal Rei and Praia de Estoril are the most reliably calm places to swim, protected from the prevailing swell and close to town. These are the best options for families and casual swimmers.

Open Surf Beaches. Praia de Santa Mónica and the other long, exposed beaches are spectacular to walk and photograph, but they are not dependable swimming beaches. Waves break heavily, currents run along the shore, and there are generally no lifeguards. Treat them as scenery rather than as a swimming destination, and never swim alone there.

Water Temperature & Wetsuit Recommendations

Seasonal Range. Sea temperatures run from around 21°C at their coolest in late winter and early spring to about 27°C at their warmest in late summer and early autumn.

What to Wear. In summer and autumn, no thermal protection is needed, though a rashguard is worth wearing for sun protection. In winter and spring, casual swimmers will find quick dips fine, but anyone spending extended time in the water, particularly kitesurfers, windsurfers, and divers, will be much more comfortable in a 2mm shorty wetsuit, since the constant wind chills you quickly once you're wet.

Section 5: Best Time to Visit by Activity

If you're planning your trip around one particular thing, this is the shortest way to pick your month.

Beach & Sun Relaxation: May to October. Warmest air and water temperatures, the lightest winds, and the least blowing sand on the beaches. Perfect for swimming and lounging.

Kitesurfing & Windsurfing: December to March. The most consistent trade wind conditions of the year, with reliable strength day after day at Praia de Chaves and Sal Rei.

Loggerhead Turtle Watching: July to October for nesting, September to December for hatching. Guided night tours with certified conservation guides run through the nesting season, with hatchlings emerging from around September onward.

Humpback Whale Watching: March to May. Whales pass through Cape Verdean waters during their spring breeding migration, and boat tours operate out of Sal Rei during this window.

Fewest Crowds & Best Value: May and November. The transitional months offer comfortable weather, moderate wind, and generally lower accommodation and flight prices.

Section 6: Practical Visitor Checklist & FAQs

A few items make a real difference in this climate, and a few questions come up again and again.

What to Pack

A light windbreaker or fleece for evenings between November and April, when the trade winds make it feel considerably cooler after sunset. High-SPF sunscreen and lip balm with SPF, since the wind disguises the strength of the sun, and sunscreen is expensive on the island. Choose a reef-safe formula if you plan to snorkel. Wraparound sunglasses and eye drops for dust, and a buff or bandana for desert excursions. Water shoes for rocky entries, and a 2mm shorty wetsuit if you're coming to ride in winter.

Frequently Asked Questions

Is the ocean safe for children to swim in? It depends entirely on the beach. In the sheltered bays around Sal Rei and Praia de Estoril, conditions are usually calm and suitable for children with supervision. On the long open beaches such as Santa Mónica, strong shore breaks and currents make swimming unsuitable for children, and often for adults too. Always follow the flag system, ask at your hotel about current conditions, and never assume that calm-looking water means safe water.

How strong are the winds at the resorts? Between November and April, expect steady, noticeable wind on exposed beaches, strong enough to blow fine sand along the shore and make a windbreak or a sheltered pool area much more comfortable. Resorts are generally laid out with this in mind. From May to October the wind eases considerably, and beach days feel much calmer.

Does it get cold at night on Boa Vista? Not cold, but cooler than most visitors expect, particularly in the windy winter months. Evenings feel fresh rather than balmy, and the constant breeze amplifies the drop after sunset. A light jacket, cardigan, or fleece is genuinely useful for outdoor dinners and evening walks between November and April.

Continue Planning Your Trip

Still deciding between islands? Our Sal vs. Boa Vista comparison covers beaches, nightlife, wildlife, and logistics side by side. For entry rules, water, and packing, see the First-Timer's Guide to Boa Vista. And to match the right beach to the right conditions, read our Boa Vista Beach Guide.