If you’re planning a trip to Cotonou, you’ll want to think about the city’s unique weather patterns. This coastal city in Benin sits in a tropical climate, with wet and dry seasons that really shape daily life and travel. Honestly, the best time to visit Cotonou is between November and March, when the dry season brings warm temps, lower humidity, and barely any rain.
You can hit the beaches, wander the busy markets, or just get around with fewer weather hassles during these months. Step outside that window and you’ll run into heavy rains from May to July, which can flood roads and slow everything down. August and September ease up a bit, with less rain and milder weather.
If you know what each season brings, you can match your trip to the activities you care about. Want to chill by the coast, dive into a festival, or just steer clear of the rain? Getting a handle on Cotonou’s climate is your ticket to a smoother visit.
Overview of Cotonou’s Climate
Cotonou sits right on the Gulf of Guinea, so you get a tropical climate with warm temps all year, high humidity, and clear wet and dry seasons. These patterns shape everything from daily routines to travel plans.
Tropical Climate Characteristics
Cotonou falls under the tropical wet and dry category, with two main seasons. The dry season runs from December to February, when you’ll see barely any rain and clearer skies. Sometimes, the harmattan winds blow in dry, dusty air, but not as often as they do up north.
The rainy season lasts from mid-March to October, with May through July getting the most rain. Usually, August gives you a short break before the rain picks up again in September and October. This keeps the landscape green but brings high humidity and plenty of clouds.
Because Cotonou hugs the coast, you won’t get wild temperature swings. The sea keeps things steady—warm and humid, but rarely extreme. If you’re not used to tropical weather, it might feel a bit much, but at least you know what to expect.
Temperature Patterns Throughout the Year
Cotonou’s temperatures don’t change much. You’ll usually see 26°C to 30°C (79–86°F). March gets the hottest, with highs over 32°C. August is the coolest, but even then, highs hover around 28°C.
At night, temps rarely dip below 22°C, even at the coolest times. So, you’re looking at warm days and nights, with not much relief from the heat.
The sea stays inviting all year, between 25.5°C and 29°C. You can swim whenever you want, which helps keep the city’s tropical vibe going strong.
Rainfall and Humidity Trends
Rain really defines Cotonou’s climate. The city gets about 1,300 mm of rain each year, and June is the wettest month, sometimes topping 300 mm. January and December are the driest, with less than 20 mm.
Rain comes in quick, heavy bursts—not those endless all-day storms. You’ll get around 75 rainy days a year, mostly packed into the wet season.
Humidity stays high, usually between 78% and 87%. June through September are the stickiest months. Even in the dry season, the air almost never feels crisp, so pack for sticky weather year-round.
Seasonal Breakdown: When to Visit Cotonou
Cotonou’s always warm and humid, but when the rain falls makes a big difference for travelers. The dry and rainy seasons really impact beach trips and getting around.
Dry Season (December to February)
From December to February, you’ll get the most reliable weather in Cotonou. Days are hot, with highs around 31–33°C, but the humidity drops, so it feels more comfortable. Nights cool off a bit, averaging 23–25°C.
Rain is rare during these months—just 1–3 rainy days per month—so you get lots of clear skies and fewer interruptions. The air feels lighter, too.
This is the sweet spot for beach days, open-air markets, and local festivals. The roads stay dry, and getting around is a breeze. If you want weather you can count on, this is your best bet.
Rainy Seasons and Intervals (March to July, September to November)
The long rainy season runs from March through July. April, May, and June bring the heaviest rainfall. During these months, expect 10–17 rainy days per month, and humidity climbs. Temperatures stay warm, 29–33°C, but the air feels even hotter because of all the moisture.
Travel can get tricky. After a big downpour, roads flood and outdoor plans get thrown off. Showers don’t always last all day, but they can really mess up your schedule.
A shorter rainy phase shows up from September to November. Rain isn’t as heavy as in May or June, but it’s still frequent. Count on 8–10 rainy days per month, with temperatures around 29–31°C. If you’re coming then, pack waterproof gear and give yourself extra time to get around.
Short Dry Season (August)
August brings a quick break in the rain, called the “short dry season.” Rainfall drops a lot compared to July, with just 4–6 rainy days in the month. Skies clear up a bit, and humidity eases, though it’s still pretty warm and sticky.
Temperatures don’t change much—daily highs are 28–29°C and lows near 23°C. It’s not as dry as December through February, but if you can’t travel in the main dry season, this is a decent alternative.
This short dry spell makes it easier to get around and enjoy outdoor spots. Beaches calm down, and with less rain, you can see the city without the usual summer hassles.
Month-by-Month Weather Overview
Cotonou’s tropical climate means warm temperatures all year. Rain, humidity, and sunshine hours shift with the seasons, so some months just feel better for being outdoors.
Best Weather Months for Travel
December through February are the most comfortable months. You get warm days—highs around 31–32°C, lows near 24–26°C—but it’s not scorching. Rain is rare, and humidity drops a bit, so walking around feels easier.
You’ll also catch more sunshine, about 7–8 hours a day. That’s perfect for sightseeing or hitting the beach. The sea stays warm, around 27–28°C—great for a swim.
November and March aren’t bad either. November has some rain but still lots of sun. March gets hotter, with highs up to 32–34°C, but rain doesn’t pick up until later. If you like it dry, this stretch is your safest choice.
Months to Avoid Due to Heavy Rain
The rain really pours from May to July and again in September and October. June is the wettest, with over 350 mm of rain spread across a bunch of days. Traveling gets tough with all the downpours and less sunshine—only 4–5 hours a day on average.
Humidity often climbs above 85%, making the air thick and heavy. Roads can flood, and outdoor plans get washed out. July and September aren’t as wet as June, but they’re still pretty damp.
August gives you a short break, but skies stay cloudy and humidity hangs on. If you want to dodge the worst of the rain, skip late spring through early fall—especially June and September.
Monthly Temperature and Precipitation Highlights
Cotonou’s temps stay steady most of the year, from 26°C in August (the coolest) to about 29–30°C in March (the warmest). Nights are warm too—rarely below 22°C.
Rainfall swings a lot.
- Dry months (Dec–Feb): 10–35 mm total.
- Peak wet months (May–Jul, Sep–Oct): 100–355 mm.
- Transitional months (Apr, Nov): 40–135 mm.
The sea is always inviting, between 25.5°C in August and 29°C in spring. You’ll get the most sun in November (8 hours/day) and the least in July (4.5 hours/day).
This mix of steady warmth, changing rain, and shifting sunshine pretty much defines Cotonou’s weather.
Ideal Weather Conditions for Activities
Cotonou’s tropical climate really shapes your plans. Dry months give you reliable sun and cooler evenings. Rainy months? Expect flooding and mud. Picking the right time makes enjoying the city, coastline, and cultural events way easier.
Sightseeing and City Exploration
The dry stretch from November to March is your best bet for exploring Cotonou’s busy streets and markets. Daytime temps land between 30–33°C, but with less humidity, it’s easier to get around. You don’t have to worry about sudden storms, either.
If you want to check out Dantokpa Market or the Cotonou Cathedral, try going in the morning before the heat really kicks in. Roads and sidewalks stay cleaner and safer in the dry season, so walking or hopping on a motorbike taxi is less stressful.
In the rainy season, especially May to July, heavy showers can flood low areas. Travel slows down and muddy streets make exploring tough. If you’re visiting then, keep some indoor options in mind—maybe museums or art galleries.
Beach and Water Activities
Cotonou’s beaches shine in the dry months between December and March. Rain is rare and the sea calms down, so swimming and beach walks are safer. Clear skies give you better views of the Atlantic, too.
Fidjrosse Beach is a favorite spot for both locals and travelers during this time. You can sunbathe, grab fresh seafood, or try water sports if the conditions are right.
May and June bring rougher seas and strong currents. Swimming gets risky, and storms often cut beach days short. For the best beach weather, stick with the dry season.
Festivals and Local Events
Most of Cotonou’s big cultural and religious events happen in the December to March window. Dry weather makes it easier for outdoor parties, parades, and concerts to go on without a hitch.
You’ll find traditional dances, street shows, and food fairs. With clear skies and dry ground, you can bounce between events and soak up the festive atmosphere without worrying about rain.
Fewer big events happen during the rainy months, since flooding and mud make outdoor gatherings a pain. If you want to catch Cotonou at its liveliest, come during the dry months.
Travel Tips Based on Weather in Cotonou
Cotonou stays hot and humid, with two main seasons: a dry stretch from November to March, and a rainy season from April to July, plus a shorter wet spell in September. If you pack smart, prep for humidity, and keep an eye on seasonal health stuff, you’ll have a much smoother trip.
What to Pack for Each Season
If you’re visiting during the dry season (November–March), just toss in some light cotton clothes, sunglasses, and sunscreen. Daytime temperatures often hit 31–33°C, and honestly, nights don’t cool down much, so you can leave heavy clothes at home.
A hat feels essential, and sandals will make wandering outdoors a lot more comfortable.
For the rainy season (April–July and September), go with a lightweight rain jacket or poncho. Streets sometimes flood after big storms, so waterproof shoes or sandals with good grip come in handy.
You might think an umbrella helps, but wind-driven rain can make it almost useless.
No matter when you go, always pack mosquito repellent. After rain, standing water brings more mosquitoes.
A small travel bag for essentials—like bottled water and maybe a reusable cloth for sweat—makes life in Cotonou’s humidity easier.
Dealing with Humidity and Rain
Humidity in Cotonou usually climbs above 80%, especially when it’s rainy. The heat feels even heavier, so try to plan outdoor activities for early morning or late afternoon.
Rain comes down hardest in May and June, with more than 14–17 wet days each month. Roads sometimes get muddy, and a few areas might flood.
Give yourself extra time to get around, and try not to wade through standing water to avoid health issues.
Most hotels have air conditioning, but smaller guesthouses might not. If you’re staying somewhere on a budget, bring a portable fan or pick a place with good airflow.
Drink lots of water, and always keep a bottle nearby—staying hydrated is honestly non-negotiable.
Health and Safety Considerations
Cotonou’s hot, sticky weather can really increase the risk of heat exhaustion. Choose breathable clothes, take breaks in the shade, and sip water regularly.
Try to avoid long stretches outdoors during midday when the sun’s at its worst.
Mosquito-borne illnesses like malaria are a real concern, especially when it’s rainy. Use a repellent with DEET, sleep under a treated net, and check with your doctor about preventive meds before your trip.
Flooded streets can get dangerous, with bad road conditions and waterborne bacteria. Stick to paved routes if you can, and wear closed shoes if you have to walk through wet spots.
If you prepare for these challenges, your trip will be safer—and honestly, a lot more enjoyable.
Summary: Choosing the Best Time for Your Trip
Cotonou’s climate stays warm year-round. Most people find the dry season offers the most comfortable conditions.
From November to March, you’ll get sunny skies, lower humidity, and fewer rainy days. It just feels easier to enjoy beaches, markets, or cultural sites when the weather cooperates.
The rainy season mainly hits from April to July. During this time, heavy showers and higher humidity can make things a bit challenging.
You might still travel, but you’ll probably deal with muddy roads and sometimes flooding. A shorter rainy spell shows up in September and October, but it’s usually less intense than the main rainy season.
If you’re into the hottest months, aim for February or March. Daytime highs often hit 33°C (91°F), so pack light clothes.
For milder temperatures, July and August hang closer to 28°C (82°F). Just keep in mind, those months bring more rain.
Here’s a quick guide to help you compare:
| Season | Months | Weather Notes | Best For |
|---|---|---|---|
| Dry Season | Nov – Mar | Sunny, low rain, comfortable temps | Beaches, sightseeing |
| Long Rains | Apr – Jul | Heavy rain, humid, travel disruptions | Indoor activities only |
| Short Rains | Sep – Oct | Moderate rain, still warm | Short visits, off-peak |
If you want a balance of good weather and local events, December through March could be your sweet spot. Festivals and outdoor activities feel more lively, and you’re less likely to have your plans disrupted by the weather.