Climate Insights for Port St Johns

The climate in Port St Johns is warm and mild. The average annual temperature is 18°C and approximately 1032mm of precipitation falls per year. March is the wettest month, receiving around 136mm of rainfall. Port St Johns is in the Southern Hemisphere. The seasons are reversed — summer runs from December to February, while winter falls between June and August. The summer months are: February, January, March. The coldest months are July, June, August, when temperatures can drop to 10°C.

Port St Johns sees moderate temperature variation throughout the year, ranging from 10°C to 26°C. The warmest month is February, when average highs reach 26°C and the mean temperature sits around 22°C. July is the coolest month, with minimum temperatures around 10°C and an average of 15°C. On average, daily temperatures fluctuate by about 10°C between overnight lows and afternoon highs. The sharpest temperature change occurs between March and April, with a 2°C shift in average temperatures.

Port St Johns is a moderately rainy area, receiving approximately 1032mm of precipitation annually, which averages out to around 86mm per month. The wettest month is March, averaging 136mm of rainfall. February and November also tend to see above-average precipitation. The driest month is June, with just 11mm. That's 125mm less than March, 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.

Port St Johns is relatively calm, with an average annual wind speed of 3km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is October, averaging 3km/h, though still comfortable for most outdoor activities. The calmest conditions occur in May, with average winds dropping to 3km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 0km/h between the calmest and windiest months.

It is currently autumn in Port St Johns, which began on March 20, 2026. Port St Johns is in the Southern Hemisphere, where the seasons are reversed — spring starts in September, summer in December, autumn in March, and winter in June. The warmest period peaks in February at around 26°C, while the coldest stretch bottoms out in July near 10°C. Winter is next, beginning on June 21, 2026 — 2 days from now.

The best time to visit Port St Johns is during May, June, July, August, September and October, when the weather is most comfortable for travellers. During these months, average temperatures hover around 16°C with modest rainfall averaging 47mm per month. By contrast, February can be uncomfortably hot with temperatures reaching 26°C. A light rain jacket is recommended, though showers are generally brief and shouldn't disrupt your plans.

The table below shows monthly climate averages for Port St Johns 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.