Climate Insights for Porto Novo

The climate in Porto Novo is warm and mild. The average annual temperature is 22°C and approximately 123mm of precipitation falls per year. September is the wettest month, receiving around 49mm 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. September is the warmest month, though highs remain moderate at 25°C with a mean of 24°C. March is the coolest month, with minimum temperatures around 19°C and an average of 19°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 123mm of precipitation annually, which averages out to around 10mm per month. The wettest month is September, averaging 49mm of rainfall. August and October also tend to see above-average precipitation. The driest month is May, with just 0mm. That's 49mm 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 very windy, with an average annual wind speed of 33km/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 37km/h, which can feel quite blustery and may affect outdoor activities. The calmest conditions occur in August, with average winds dropping to 27km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 10km/h between the calmest and windiest months. Wind tends to be stronger during winter months, driven by seasonal pressure systems. The seasonal averages break down to 36km/h in winter, 35km/h in spring, 30km/h in summer, 31km/h in autumn.

It is currently spring in Porto Novo, which began on March 20, 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. Summer is next, beginning on June 21, 2026 — 89 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 10mm 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.