Weather in Montego Bay in September

How September compares

September is the 4th warmest month of the year in Montego Bay and ranks 7th of 134 destinations we compare for September - see where else is hot in September. Against London's average high of 18.6°C in September, Montego Bay is 12.3°C warmer by day and 14.1°C warmer at night.

Daytime and night-time in September

The typical September day in Montego Bay peaks at 30.9°C, but that is an average: the warmest 10% of days reach 31.9°C or more. About 100% of days top 25°C and almost every pass 30°C. Nights average 25.3°C; one night in ten drops to 24.4°C or lower, so pack a layer for evenings. Between 1991 and 2020 the hottest September day here reached 33.2°C (2017-09-28) and the coldest night 23.1°C (1992-09-28).

Rain in September

Wet (more than 8 rainy days): about 26 days with 1 mm or more, 205 mm in total. Year to year it varies a lot - the wettest September was 2004 with 316 mm, the driest 2015 with 127 mm. Humidity averages 84%, which makes the heat feel heavier than the thermometer suggests.

Sea temperature in September

The sea averages 29.6°C - warm enough to swim (22°c+). Depending on the year it ranges from 29.3°C to 30.1°C. This is the warmest the sea gets here all year.

Sunshine and daylight

Around 4.4 hours of sunshine a day (estimated from cloud cover), 12.1 hours of daylight: the sun rises about 05:59 and sets about 18:14 local time in mid-September. Average cloud cover is 63%.

Is September a good time to visit Montego Bay?

It is a reasonable choice: hot days but expect showers. The best months for Montego Bay on our scoring are February, January, March; months averaging 25°C or more: Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec.

Expect heat that stays with you into the evening

The main consideration is not just the temperature but how little relief you get from it. With humidity at 84%, allow for sticky conditions rather than expecting dry heat. Choose loose, light clothing, keep water handy and leave room for shaded breaks around midday. Evenings remain warm, so pack for comfort in the heat rather than relying on a cool night to reset. If you find humid weather tiring, avoid filling your days with outdoor commitments. September makes sense for travellers happy to slow their pace; it is less suitable if you want to stay active outside without thinking much about the weather.

Warm water is the reward; frequent rain is the catch

The sea averages 29.6°C, making swimming a strong reason to consider September. The catch is that warm water does not come with reliably sunny skies: sunshine averages about 4.4 hours a day, so do not picture uninterrupted sun throughout your stay. With rain on about 26 days, keep swimming and other outdoor plans flexible, and pack a light waterproof or umbrella. Give yourself somewhere comfortable to spend wet spells rather than making every day depend on being outside. This is a reasonable choice if warmth matters more to you than clear skies, but a less convincing fit if your holiday depends on long, dry days by the water.