Cotonou in September
In September, Cotonou averages 27°C (81°F) during the day and 25°C (76°F) at night, with frequent rain — about 30 days of the month see precipitation (141 mm total).
ShoulderConditions are warm and beach-friendly. Expect daily rain or showers, often in heavy bursts.
September offers comfortable temperatures in Cotonou, with some rain to plan around.
How September compares to the rest of the year in Cotonou
September is one of the coolest months in Cotonou (10th of 12) and one of the wettest months (3rd of 12). Daytime temperature runs 2°C below the annual average (29°C). September runs 1°C warmer than August (26°C) and warms a further 1°C into October (28°C).
September sunrise & sunset in Cotonou
Times shown for Cotonou local time (Africa/Porto-Novo), calculated for the 15th of September. They shift by a few minutes day to day across the month.
Photography light in Cotonou — September
Golden-hour and blue-hour windows for the 15th of September, in Cotonou's local time. Use these for soft warm light (golden) or cool architectural twilight (blue).
📅 When to book — Cotonou in September
Travel writers usually only tell you when to go. Here's when to book flights and lodging for the best mix of price and availability, based on September's tier (Shoulder) and Cotonou's popularity.
Crowds & pricing — September in Cotonou
Cotonou is in a shoulder season month — fewer crowds, slightly lower prices, and a calmer atmosphere than peak weeks. Most major sights stay open with normal hours, though a handful of seasonal restaurants or boat trips may run reduced schedules. Many regulars consider these months the best time to visit because you trade a small amount of weather reliability for a much more pleasant on-the-ground experience.
Sun & mosquito risk — September in Cotonou
UV is a clear-sky sea-level estimate — clouds, altitude, and reflective surfaces (snow, water) shift it ±30%. Mosquito risk is climate-derived only; for current disease advisories (dengue, malaria, zika) check the CDC or WHO travel pages before your trip.
Cotonou in other months
| Month | Avg high | Avg low | Rainfall | Rain days | Snow days |
|---|---|---|---|---|---|
| January | 30°C / 86°F | 25°C / 77°F | 23 mm | 16 | — |
| February | 30°C / 87°F | 26°C / 79°F | 31 mm | 21 | — |
| March | 30°C / 86°F | 27°C / 80°F | 73 mm | 25 | — |
| April | 30°C / 86°F | 27°C / 80°F | 71 mm | 25 | — |
| May | 29°C / 85°F | 26°C / 79°F | 165 mm | 30 | — |
| June | 28°C / 82°F | 25°C / 77°F | 236 mm | 29 | — |
| July | 27°C / 80°F | 25°C / 76°F | 114 mm | 29 | — |
| August | 26°C / 80°F | 24°C / 75°F | 94 mm | 27 | — |
| September | 27°C / 81°F | 25°C / 76°F | 141 mm | 30 | — |
| October | 28°C / 83°F | 25°C / 77°F | 147 mm | 31 | — |
| November | 29°C / 85°F | 26°C / 79°F | 69 mm | 28 | — |
| December | 30°C / 86°F | 25°C / 78°F | 21 mm | 16 | — |
Other cities with similar September weather
🌍 See the full ranked list of climate twins for Cotonou in September →
Frequently asked questions
How hot is Cotonou in September?
In September, Cotonou averages a high of 27°C (81°F) and a low of 25°C (76°F) — generally warm.
Does it rain a lot in Cotonou in September?
September is quite rainy in Cotonou, with about 30 rainy days on average.
Is September a good time to visit Cotonou?
September is warm but on the rainy side. It suits travelers who are comfortable with warm weather; check the month-by-month ranking to compare it against the rest of the year.
What should I pack for Cotonou in September?
Pack lightweight, breathable clothing, sunglasses and sunscreen, plus a compact umbrella or rain jacket. See the full September packing list for Cotonou for a complete, climate-based checklist.
Check the live 10-day forecast and sunrise/sunset.