Portmore in Fall
In fall (September, October and November), Portmore sees average daytime highs around 29°C and overnight lows near 24°C, with 345 mm of rain over about 52 wet days across the season. It is the 2nd-warmest season and the wettest season of the year.
Over the season highs ease from about 30°C in early September to 28°C by late November. The sky is clear or mostly clear about 32% of the time across fall, and the air most often feels oppressive.
Fall is Portmore's weakest season of the year to visit on our travel score. Portmore 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 Portmore's year-round climate.
- Avg daytime high
- 29°C
- 2nd-warmest season
- Avg overnight low
- 24°C
- Rainfall
- 345 mm
- 52 wet days
- Avg wind
- 9 km/h
- Travel score
- 4.9
- weakest season of the year
- Months
- Sep · Oct · Nov
Temperature in Portmore in Fall
Over the season highs ease from about 30°C in early September to 28°C by late November.
A typical fall day in Portmore reaches about 29°C and drops to 24°C overnight. The warmest of the three months is September, the coolest November.
How fall really feels in Portmore
Once humidity and wind are folded in, fall brings about 34 days that feel above 32°C and 0 that feel at or below 0°C.
The story in fall is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
Portmore weather by month
How the three fall months (September, October and November) 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 | 27° / 22° | 17 | 4.4 | 11 | 7.8 |
| Feb | 27° / 22° | 17 | 4.6 | 11.4 | 7.7 |
| Mar | 27° / 22° | 31 | 6.5 | 11.9 | 7.4 |
| Apr | 28° / 23° | 48 | 9.4 | 12.4 | 6.6 |
| May | 28° / 23° | 119 | 15.4 | 12.8 | 5.2 |
| Jun | 29° / 24° | 68 | 11 | 13.1 | 5.2 |
| Jul | 30° / 25° | 52 | 9.4 | 13 | 5.2 |
| Aug | 30° / 25° | 86 | 14.6 | 12.6 | 4.5 |
| Sep | 29° / 24° | 139 | 18.9 | 12.1 | 4.2 |
| Oct | 28° / 24° | 140 | 21.4 | 11.6 | 4.3 |
| Nov | 28° / 23° | 67 | 11.7 | 11.2 | 6.1 |
| Dec | 27° / 22° | 30 | 6.2 | 10.9 | 7.4 |
Cloud cover in Fall
The sky is clear or mostly clear about 32% of the time across fall.
Chance of precipitation in Fall
Portmore gets around 345 mm of rain over 52 wet days across fall. The line is the day-by-day chance of measurable precipitation.
Humidity in Fall
Most of fall feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Fall
Winds average 9 km/h across fall.
Sunrise & sunset in Fall
Daylight runs from about 12 h 24 min in early September to 11 hours by late November. The lit band spans sunrise to sunset each day.
Solar energy in Fall
Average shortwave solar energy reaching the ground each day across fall, about 5.1 kWh/m².
Hazard calendar for Portmore
In fall, Portmore overlaps its atlantic hurricane and rainy season season. The full year is below, with each hazard's peak months called out.
Portmore sits in the Atlantic hurricane belt; the season peaks August–October.
Portmore's rainy season runs May–June, when most of the year's rain falls.
Is fall a good time to visit Portmore?
Our two travel scores rate fall for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
fall is a reasonable time to visit Portmore for sightseeing.
What to pack for Portmore in Fall
From fall's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In fall, Portmore sees daytime highs around 29°C and nights near 24°C. Pack light clothes and rain gear. Worth having: sun protection. About 52 days see rain.
Sea temperature near Portmore in Fall
The nearest coast averages about 29°C across fall — 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 | 28 | 28 | 28 | 29 | 29 | 29 | 29 | 29 | 28 |
| Comfort | Warm | Warm | Warm | Warm | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 27 | Warm |
| Feb | 27 | Warm |
| Mar | 27 | Warm |
| Apr | 28 | Warm |
| May | 28 | Tropical |
| Jun | 28 | Tropical |
| Jul | 29 | Tropical |
| Aug | 29 | Tropical |
| Sep | 29 | Tropical |
| Oct | 29 | Tropical |
| Nov | 29 | Tropical |
| Dec | 28 | Tropical |
UV index in Portmore in Fall
Clear-sky midday UV across fall averages around 10 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Portmore peaks around April 19 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 16 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 Portmore in Fall
Average fine-particle pollution (PM2.5) through the year — so you can see where fall falls, not just the annual average.
Air quality in Portmore is worst in June — around 35 µg/m³ PM2.5 (poor), about 2.1× the cleanest month (January, 17 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) | 17 | 17 | 18 | 18 | 24 | 35 | 34 | 29 | 23 | 24 | 20 | 17 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Poor | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 17 | Moderate |
| Feb | 17 | Moderate |
| Mar | 18 | Moderate |
| Apr | 18 | Moderate |
| May | 24 | Moderate |
| Jun | 35 | Poor |
| Jul | 34 | Moderate |
| Aug | 29 | Moderate |
| Sep | 23 | Moderate |
| Oct | 24 | Moderate |
| Nov | 20 | Moderate |
| Dec | 17 | Moderate |
Where is Portmore?
Portmore sits at 18.0°N, 76.9°W, 7 m above sea level, in Jamaica. The nearest listed city is Port Royal, 6.0 km away.
Topography around Portmore
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Portmore.
Within 3 km, the terrain around Portmore has only modest variations in elevation — a maximum elevation change of 201 m around an average of 14 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 767 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,229 m.
The land around Portmore is covered by artificial surfaces (43%) and trees (25%) within 3 km, trees (43%) and water (27%) within 16 km, and water (58%) and trees (35%) 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 Portmore (17.971°, -76.8869°, elevation 7 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.