Port Antonio Temperature by Month

Port Antonio, Portland, Jamaica has a consistently comfortable climate year-round, with daytime highs averaging 28°C (82°F). Below you'll find a full monthly breakdown and a comparison with cities worldwide.

With minimal seasonal shifts, Port Antonio experiences a constant climate year-round. Maximum daytime temperatures range from a comfortable 30°C (86°F) in August to a comfortable 27°C (81°F) in January. At night, temperatures range from 25°C (77°F) in August to 23°C (73°F) in January.

The chart below illustrates the average maximum day and minimum night temperatures in Port Antonio by month:

Temperatures tend to bottom out between 4 AM and 6 AM, then climb to their daily peak around 3 PM. August, the warmest month, sees 263 hours of sunshine.

The chart below shows the average temperature throughout the year:

Port Antonio's average annual maximum temperature is 28°C (82°F). To put that in context, here's how it compares to a few well-known destinations:

Rome, Italy averages 20°C (68°F) annually, with reliably warm summers and comfortable winters.

Glasgow, Scotland averages 13°C (55°F) a year, mild but often grey, with cold winters and rarely hot summers.

Buenos Aires, Argentina averages 23°C (73°F) a year, with hot summers and mild winters, and seasons reversed compared to Europe.

Adelaide, Australia averages 21°C (70°F) a year, with warm summers, mild winters, and relatively low rainfall year-round.

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 Port Antonio, January is the coolest month, with average highs of 27°C (81°F) and humidity around 73%, considered high. In August, the warmest month, temperatures average 30°C (86°F) with 76% humidity, conditions that feel 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.

For cities and regions with significant elevation, altitude is one of the biggest factors shaping local temperatures. As a rule of thumb, temperatures fall by around 6°C for every 1,000 metres gained, so a city at 2,000 metres will typically be around 12°C cooler than a city at sea level in the same region. Higher ground also tends to see more dramatic day-to-night temperature swings, since thinner air loses heat faster after sunset.

For more on Port Antonio's weather, including monthly rainfall, sunshine hours, and humidity, visit our Port Antonio climate page.