Cotonou weather in August

August in Cotonou: hot, rainy, with clean air — fine if you can take 18 rainy days.

Updated September 2026 · climate normals from ERA5 reanalysis

Cotonou🇧🇯 Benin · Gulf of Guinea · City69
  1. 70Jan
  2. 66Feb
  3. 67Mar
  4. 66Apr
  5. 61May
  6. 56Jun
  7. 66Jul
  8. 69Aug
  9. 62Sep
  10. 60Oct
  11. 67Nov
  12. 69Dec

#2 of 12 months in Cotonou · #943 of 1413 destinations to visit in August · comfort 69/100 (tier C)

Days
29°C
Nights
24°C
Wet days
18
Sun
9.1 h
Humidity
86%
Daylight
12 h
Cotonou, Benin
Photo: Iwaria · Pexels

Traveller notes on Cotonou in August

Notes from nearby Lomé (135 km away)

Cotonou doesn't have its own notes for August yet — these are about Lomé, close enough to share the season.

Forum coverage specific to Lome's August weather is thin, with posters' discussions leaning more toward general travel advice, drivers and border logistics than granular climate detail. Togo's coastal stretch, Lome included, sits within a shorter dry season that runs roughly from July through September, a real break between the country's two wetter periods earlier and later in the year - meaning August should bring comparatively less rain than the surrounding months even though the coast's tropical humidity remains a constant regardless of season. Given the sparse detailed trip reports available, posters' practical guidance for Lome centers more on logistics and border crossings into neighboring Benin and Ghana than on weather specifics.
Tripadvisor community · August · 1 month ago · about Lomé · Read more on Tripadvisor ↗

Other months in Cotonou

Forum posters describe Benin's coast as having two rainy seasons, April through July and September through mid-October, both generally recommended to avoid given unstable weather and a rougher sea. Posters instead point to late December through mid-February as the better overall window for a Cotonou visit. Given July falls within the first of those two rainy stretches, posters' framing implies hot, humid conditions with substantial rain and choppier coastal waters typical of this part of the West African coast. Posters generally rate July as one of Cotonou's weaker weather windows, with the December-February dry stretch a clearly better-regarded alternative.
Tripadvisor community · July · 1 month ago · Read more on Tripadvisor ↗
Forum posters describe the Harmattan winds - dry Saharan air carrying a lot of dust - as a defining feature of this stretch of the West African coast from roughly late December through mid-February, meaning January sits squarely within that hazy, dust-laden but comparatively dry window. Posters specifically flag February through April as the hottest months of the year here, implying January itself, while still warm and humid on the coast, runs a touch more moderate than the peak heat still to come. Posters generally recommend light, breathable clothing regardless of the Harmattan's dry-air reputation, since the dust itself - rather than rain - is the main practical annoyance travelers report for a January visit to Cotonou.
Tripadvisor community · January · 1 month ago · Read more on Tripadvisor ↗

Add your own note from Cotonou's card on the map.

Cotonou climate normals — August

Daytime high29°C / 83°F🥵 hot
Nighttime low24°C / 76°F
Feels like (high)32°C / 90°F
Sea temperature27°C / 80°F😎 warm sea
Rainfall121 mm / 4.8 in🌧 rainy
Rainy days18 days
Humidity86%💦 very humid
Dew point23°C / 74°F
Sunshine9.1 h/day
Daylight12.3 h
Wind18 km/h / 11 mph
Air quality (US AQI)37🍃 good

Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.

Crowds in Cotonou in August

How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.

BusyIndependence Day, school holidays in 4 of the markets that fill it(estimated)

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Peak crowdsBusyShoulder seasonQuiet

Best months for Cotonou's weather

Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).

Fair weatherCotonou's weather doesn't swing hard through the year — comfort stays fairly steady in every month.

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What's on in Cotonou in August

Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.

  • Season

    The little dry season

    20 Jul – 10 Sep · usually

    The rains ease off for a few weeks in the middle of the wet half of the year. Locals call it the small dry season; the sky often stays grey but the roads dry out and the lagoon traffic gets moving again.

  • Holiday

    Independence Day

    1 AugNational holidayClosuresCrowded

    Benin marks 1 August with a military parade and offices closed nationwide. It falls inside the short dry break, so it is one of the more reliable outdoor dates of the Cotonou year. Source ↗

What's on around the world in August →

Where is Cotonou?

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Cotonou in August — FAQ

Is August a good time to visit Cotonou?
August in Cotonou: hot, rainy, with clean air — fine if you can take 18 rainy days. It ranks #2 of 12 months for Cotonou on SeasonMap's comfort score (69/100).
What is the weather like in Cotonou in August?
In August, Cotonou averages a daily high of 28.5°C and a low of 24.4°C, with about 121.3 mm of rain over roughly 18.3 rainy days.
What is the air quality in Cotonou in August?
Cotonou has a mean US Air Quality Index of about 37 in August.