Climate Insights for Porto Novo

The climate in Porto Novo is warm and mild. The average annual temperature is 22°C and approximately 135mm of precipitation falls per year. September is the wettest month, receiving around 62mm of rainfall. Porto Novo is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: September, October, August. The coldest months are March, February, April, when temperatures can drop to 19°C.

Porto Novo has relatively stable temperatures year-round, staying within a 6°C range. The warmest month is September, when average highs reach 25°C and the mean temperature sits around 25°C. March is the coolest month, with minimum temperatures around 19°C and an average of 20°C. Daily temperature variation is modest, with an average difference of 1°C between highs and lows.

Porto Novo is a quite dry location, receiving approximately 135mm of precipitation annually, which averages out to around 11mm per month. The wettest month is September, averaging 62mm of rainfall. August and October also tend to see above-average precipitation. The driest month is May, with just 1mm. That's 62mm less than September, the wettest month. Rainfall is heavily concentrated in certain months, creating a distinct wet and dry season. Visitors should plan around these patterns, as the difference between peak and low months is dramatic.

Porto Novo is relatively calm, with an average annual wind speed of 7km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is February, averaging 9km/h, though still comfortable for most outdoor activities. The calmest conditions occur in August, with average winds dropping to 6km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 3km/h gap between the calmest and windiest months.

It is currently summer in Porto Novo, which began on June 21, 2026. Porto Novo is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in September at around 25°C, while the coldest stretch bottoms out in March near 19°C. Autumn is next, beginning on September 23, 2026 — 93 days from now.

The best time to visit Porto Novo is during January, February, March, April, May, June, July, August, September, October, November and December, when the weather is most comfortable for travellers. During these months, average temperatures hover around 22°C with modest rainfall averaging 11mm per month. With minimal rainfall expected, you can pack light and plan outdoor activities with confidence.

The table below shows monthly climate averages for Porto Novo based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.