Climate Insights for Saint Helena Bay

The climate in Saint Helena Bay is temperate. The average annual temperature is 16°C and approximately 221mm of precipitation falls per year. June is the wettest month, receiving around 53mm of rainfall. Saint Helena Bay 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: January, February, December. The coldest months are July, August, June, when temperatures can drop to 12°C.

Saint Helena Bay has relatively stable temperatures year-round, staying within a 8°C range. January is the warmest month, though highs remain moderate at 20°C with a mean of 19°C. July is the coolest month, with minimum temperatures around 12°C and an average of 13°C. Daily temperature variation is modest, with an average difference of 4°C between highs and lows.

Saint Helena Bay is a quite dry location, receiving approximately 221mm of precipitation annually, which averages out to around 18mm per month. The wettest month is June, averaging 53mm of rainfall. July and August also tend to see above-average precipitation. The driest month is February, with just 4mm. That's 49mm less than June, 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.

Saint Helena Bay is moderately windy, with an average annual wind speed of 29km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is January, averaging 33km/h, which can feel quite blustery and may affect outdoor activities. The calmest conditions occur in May, with average winds dropping to 23km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 10km/h gap between the calmest and windiest months. Wind tends to pick up during the summer months. The seasonal averages are 26km/h in winter, 30km/h in spring, 32km/h in summer, 27km/h in autumn.

It is currently winter in Saint Helena Bay, which began on June 21, 2026. Saint Helena Bay 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 January at around 20°C, while the coldest stretch bottoms out in July near 12°C. Autumn is next, beginning on March 20, 2026 — 3 days from now.

The best time to visit Saint Helena Bay is during January, February, March, April, October, November and December, when the weather is most comfortable for travellers. During these months, average temperatures hover around 17°C with modest rainfall averaging 9mm per month. By contrast, July can be quite cold with temperatures dropping to 12°C. With minimal rainfall expected, you can pack light and plan outdoor activities with confidence.

The table below shows monthly climate averages for Saint Helena Bay 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.