St James Temperature by Month
St James, Western Cape, South Africa has a consistently pleasant climate year-round, with daytime highs averaging 19°C (66°F). Below you'll find a full monthly breakdown and a comparison with cities worldwide.
St James Monthly Temperatures
Year-round, St James experiences a consistently pleasant climate. Maximum daytime temperatures range from a comfortable 23°C (73°F) in February to a moderate 17°C (63°F) in the coolest month, August. Nighttime temperatures range from 18°C (64°F) in February to 12°C (54°F) in August.
The chart below illustrates the average maximum day and minimum night temperatures in St James by month:
Low temperatures are most often recorded between 4 AM and 6 AM, while highs typically occur around 3 PM. February, the city's warmest month, sees 297 hours of sunshine.
The chart below shows the average temperature throughout the year:
Temperature: St James vs South Africa
The map below shows the annual temperature across South Africa. You can also select individual months if you want to compare a specific time of year.
very warm
warm
pleasant
moderate
cold
very cold
St James vs World: Temperature Compared
St James's average annual maximum temperature is 19°C (66°F). To put that in context, here's how it compares to a few well-known destinations:
Seville, Spain averages 23°C (73°F) a year — one of the warmer cities in Western Europe, with long hot summers.
Queenstown, New Zealand averages 10°C (50°F) annually — remember seasons are flipped, so its coldest months fall in June and July.
Boston, USA averages 16°C (61°F) annually, with four distinct seasons and cold winters that rival northern Europe.
Adelaide, Australia averages 21°C (70°F) a year, with warm summers, mild winters, and relatively low rainfall year-round.
What Does the Temperature Feel Like in St James?
Temperature alone doesn't tell the whole story — humidity plays a big role in how warm or cold it actually feels. High humidity in summer makes the heat feel more intense, particularly once temperatures climb above 25°C. In winter, the same humidity can make cold air feel sharper than the thermometer suggests.
In St James, August is the coolest month, with average highs of 17°C (63°F) and humidity around 80% — considered very high. For a full picture, see our humidity page.
Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.
The readings come from a range of sources — land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.
Seasonal temperature shifts influence more than just how warm it feels — they also drive changes in rainfall, cloud cover, and wind patterns throughout the year.
Warmer air holds more moisture, which tends to mean heavier or more frequent rain during the warmer months. When temperatures drop in winter, any precipitation that does fall is more likely to come as snow or sleet, though in St James this rarely lasts long on the ground.
For more on St James's weather — including monthly rainfall, sunshine hours, and humidity — visit our St James climate page.
