Climate Insights for Port Saint John’s

The climate in Port Saint John’s is warm and mild. The average annual temperature is 20°C and approximately 1105mm of precipitation falls per year. Port Saint John’s receives a notable amount of rainfall throughout the year, including during its driest month. Port Saint John’s 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, August, June, when temperatures can drop to 14°C.

Port Saint John’s sees moderate temperature variation throughout the year, ranging from 14°C to 25°C. The warmest month is February, when average highs reach 25°C and the mean temperature sits around 23°C. July is the coolest month, with minimum temperatures around 14°C and an average of 18°C. Daily temperature variation is modest, with an average difference of 5°C between highs and lows.

Port Saint John’s is a moderately rainy area, receiving approximately 1105mm of precipitation annually, which averages out to around 92mm per month. The wettest month is April, averaging 149mm of rainfall. December and November also tend to see above-average precipitation. The driest month is July, with just 40mm. That's 110mm less than April, the wettest month. Precipitation varies noticeably between seasons, with the first half (January to June) of the year generally seeing more rainfall.

Port Saint John’s is moderately windy, with an average annual wind speed of 26km/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 29km/h, noticeable enough to affect lighter outdoor activities. The calmest conditions occur in May, with average winds dropping to 23km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 6km/h between the calmest and windiest months.

It is currently winter in Port Saint John’s, which began on June 21, 2026. Port Saint John’s 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 25°C, while the coldest stretch bottoms out in July near 14°C. Autumn is next, beginning on March 20, 2026 — 3 days from now.

The best time to visit Port Saint John’s is during May, June, July, August and September, when the weather is most comfortable for travellers. During these months, average temperatures hover around 18°C with modest rainfall averaging 55mm per month. By contrast, February can be uncomfortably hot with temperatures reaching 25°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 Saint John’s 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.