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
#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

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.
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.
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.
Add your own note from Cotonou's card on the map.
Cotonou climate normals — August
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)
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.
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 · usuallyThe 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 holidayClosuresCrowdedBenin 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 ↗
Where is Cotonou?
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.