Port Antonio in Summer
In summer (June, July and August), Port Antonio sees average daytime highs around 28°C and overnight lows near 25°C, with 281 mm of rain over about 54 wet days across the season. It is the warmest season of the year and the driest season of the year.
Across summer, daytime highs hold fairly steady around 28°C. The sky is clear or mostly clear about 33% of the time across summer, and the air most often feels oppressive.
Summer is Port Antonio's 3rd-best season to visit on our travel score. Port Antonio has little temperature swing across the year, so its calendar seasons blur — the season framing matters less here than for a place with four distinct seasons. For the whole year in context, see Port Antonio's year-round climate.
- Avg daytime high
- 28°C
- warmest season of the year
- Avg overnight low
- 25°C
- Rainfall
- 281 mm
- 54 wet days
- Avg wind
- 13 km/h
- Travel score
- 4.9
- 3rd-best season
- Months
- Jun · Jul · Aug
Temperature in Port Antonio in Summer
Across summer, daytime highs hold fairly steady around 28°C.
A typical summer day in Port Antonio reaches about 28°C and drops to 25°C overnight. The warmest of the three months is August, the coolest June.
How summer really feels in Port Antonio
Once humidity and wind are folded in, summer brings about 34 days that feel above 32°C and 0 that feel at or below 0°C.
The story in summer is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
Port Antonio weather by month
How the three summer months (June, July and August) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 25° / 23° | 98 | 20 | 11 | 5.6 |
| Feb | 25° / 22° | 65 | 17 | 11.4 | 5.8 |
| Mar | 25° / 23° | 87 | 18 | 11.9 | 5.9 |
| Apr | 26° / 23° | 76 | 17 | 12.4 | 5.7 |
| May | 27° / 24° | 138 | 21.3 | 12.8 | 4.9 |
| Jun | 28° / 25° | 96 | 16.7 | 13.1 | 5.2 |
| Jul | 28° / 25° | 83 | 17.1 | 13 | 5.1 |
| Aug | 29° / 25° | 102 | 19.9 | 12.6 | 4.5 |
| Sep | 28° / 25° | 131 | 21.4 | 12.1 | 4.2 |
| Oct | 28° / 25° | 183 | 24.7 | 11.6 | 4.2 |
| Nov | 27° / 24° | 156 | 22 | 11.1 | 4.7 |
| Dec | 26° / 23° | 123 | 20.5 | 10.9 | 5.3 |
Cloud cover in Summer
The sky is clear or mostly clear about 33% of the time across summer.
Chance of precipitation in Summer
Port Antonio gets around 281 mm of rain over 54 wet days across summer. The line is the day-by-day chance of measurable precipitation.
Humidity in Summer
Most of summer feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Summer
Winds average 13 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 13 hours in early June to 12 h 24 min by late August. The lit band spans sunrise to sunset each day.
Solar energy in Summer
Average shortwave solar energy reaching the ground each day across summer, about 6.6 kWh/m².
Hazard calendar for Port Antonio
In summer, Port Antonio overlaps its atlantic hurricane season. The full year is below, with each hazard's peak months called out.
Port Antonio sits in the Atlantic hurricane belt; the season peaks August–October.
Is summer a good time to visit Port Antonio?
Our two travel scores rate summer for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
summer is a reasonable time to visit Port Antonio for sightseeing.
What to pack for Port Antonio in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Port Antonio sees daytime highs around 28°C and nights near 25°C. Pack light clothes, rain gear and sun protection. About 54 days see rain.
Sea temperature near Port Antonio in Summer
The nearest coast averages about 29°C across summer — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea offshore is warmest in September at about 29°C and coldest in February near 27°C.
The water stays above 20°C all year — warm enough for a swim any month.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 27 | 27 | 27 | 27 | 28 | 28 | 29 | 29 | 29 | 29 | 29 | 28 |
| Comfort | Warm | Warm | Warm | Warm | Warm | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Warm |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 27 | Warm |
| Feb | 27 | Warm |
| Mar | 27 | Warm |
| Apr | 27 | Warm |
| May | 28 | Warm |
| Jun | 28 | Tropical |
| Jul | 29 | Tropical |
| Aug | 29 | Tropical |
| Sep | 29 | Tropical |
| Oct | 29 | Tropical |
| Nov | 29 | Tropical |
| Dec | 28 | Warm |
UV index in Port Antonio in Summer
Clear-sky midday UV across summer averages around 12 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Port Antonio peaks around April 18 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 15 at about 7 (very high).
The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 8 | 10 | 12 | 13 | 12 | 13 | 11 | 12 | 12 | 11 | 8 | 7 |
| Level | Very high | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Very high | Very high |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 8 | Very high |
| Feb | 10 | Extreme |
| Mar | 12 | Extreme |
| Apr | 13 | Extreme |
| May | 12 | Extreme |
| Jun | 13 | Extreme |
| Jul | 11 | Extreme |
| Aug | 12 | Extreme |
| Sep | 12 | Extreme |
| Oct | 11 | Extreme |
| Nov | 8 | Very high |
| Dec | 7 | Very high |
Air quality in Port Antonio in Summer
Average fine-particle pollution (PM2.5) through the year — so you can see where summer falls, not just the annual average.
Air quality in Port Antonio is worst in June — around 32 µg/m³ PM2.5 (moderate), about 4.2× the cleanest month (December, 8 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 8 | 10 | 10 | 12 | 19 | 32 | 31 | 25 | 17 | 14 | 9 | 8 |
| Level | Good | Good | Good | Good | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 8 | Good |
| Feb | 10 | Good |
| Mar | 10 | Good |
| Apr | 12 | Good |
| May | 19 | Moderate |
| Jun | 32 | Moderate |
| Jul | 31 | Moderate |
| Aug | 25 | Moderate |
| Sep | 17 | Moderate |
| Oct | 14 | Moderate |
| Nov | 9 | Good |
| Dec | 8 | Good |
Where is Port Antonio?
Port Antonio sits at 18.2°N, 76.5°W, 0 m above sea level, in Jamaica. The nearest listed city is Morant Bay, 33 km away.
Topography around Port Antonio
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Port Antonio.
Within 3 km, the terrain around Port Antonio has significant variations in elevation — a maximum elevation change of 309 m around an average of 57 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,458 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,224 m.
The land around Port Antonio is covered by trees (59%) and water (36%) within 3 km, trees (51%) and water (48%) within 16 km, and water (68%) and trees (28%) within 80 km.
Jamaica travel facts
- Travel advisory
- Level 2
- Exercise Increased Caution
- Power plugs
- Type A / B
- 110 V · 50 Hz
- Prices
- ≈ 60% of US
- price level, 2025
- GDP per capita
- $8,003
- 2025
- Happiness
- 6.3 / 10
- World Happiness, 2025
- Homicide rate
- 49.4
- per 100k, 2023
- Road deaths
- 15.1
- per 100k/yr, 2019
- Income group
- Upper middle
- World Bank
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Port Antonio (18.1789°, -76.4522°, elevation 0 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google.