Hot in Sep
33°C average high
avg high · 18° at night
25°C+ on almost every day · often 35°C+
Caribbean
Jamaica (Montego Bay) weather in September
Is it warm? Yes. September in Jamaica (Montego Bay) is hot: afternoons average 31°C and nights 25°C. Most days (80%) peak between 30°C and 33°C.
Hot · average high
31°C
25°C or more on almost every day.
- Average low25°overnight
- Sea31°average, 2023–2025
- Rainy days21173 mm in the month
- SkyOften cloudy62% cloud · 14% clear days
How warm it really gets
Every September afternoon from 2011–2025: 450 days. Most (80%) peaked between 30° and 33°.
September, year by year
The average September high in each year. The warmest, 2023, averaged 33°C; the coolest, 2018, 31°C.
Compared with home
Average September highs. Expect rain on about 21 days (173 mm in a typical month).
- Jamaica (Montego Bay)31°
- London19°
- Manchester17°
- Dublin17°
- Cork17°
- Belfast16°
- Glasgow16°
Warmer in September, not much further
Flying times are estimates from Dublin; Jamaica (Montego Bay) is about 9h 15m.
Very hot in Sep
37°C average high
avg high · 27° at night
25°C+ on almost every day · often 35°C+
Very hot in Sep
37°C average high
avg high · 24° at night
25°C+ on almost every day · often 35°C+
Air: ERA5 reanalysis via Open-Meteo, 2011–2025. Sea: Copernicus Marine analysis via Open-Meteo, 2023–2025. Rainy day = 2 mm or more. Clear day = average cloud cover of 30% or less. These are averages of past weather, not a forecast. Methodology