St Mary Weather in September
With daytime temperatures of 31°C (88°F) and nighttime lows of 25°C (77°F), September in St Mary brings very high temperatures during the day. Do keep in mind that quite a bit of rainfall is typical. Around 120 mm (4.7 in) falls on average.
Rainfall in St Mary in September
On average, there are about 14 days with rain during this month, averaging 120 mm (4.7 in). The rain this month tends to fall in heavier spells rather than light drizzle. When it rains, showers can be significant.
Temperature in St Mary in September
Daytime highs in St Mary in September reach 31°C (88°F), with nights around 25°C (77°F). The hottest part of the day is usually in the afternoon, so lighter clothing can help you stay comfortable. Nights stay warm at around 25°C (77°F), so light bedding and good ventilation are worth thinking about.
Sunshine in St Mary in September
Expect a lot of sunshine this month, with about 228 hours of sun. These sunny conditions add to the overall experience.September in St Mary has its charm, but if you're looking for destinations with pleasant temperatures and sunny skies, our weather planner can help you explore other options in the world.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Jamaica, check out our St Mary's climate page.
St Mary Temperature in September
Min Temperature
25°C (77°F)
Max Temperature
31°C (88°F)
Chance of Rain
47%
Precipitation
120 mm (4.7 in)
Rainy days
14 days
Humidity
78% *
Sunshine
228 hours *
Percentage Sunshine
*
Daily Historical Temperatures
49-year average (1976-2025)
Based on our historical records, temperatures in St Mary typically stay consistent throughout September, with daily highs averaging around 31°C (88°F). Nights are warm, with lows around 26°C (79°F).
Average temperatures in September
Daily Historical Precipitation
49-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather for St Mary in September
Browse day-by-day weather records for St Mary spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
St Mary historical weather extremes in September
Based on 20 years of weather observations in St Mary between 2005 and 2025, these are the recorded extremes.
- St Mary recorded its highest September temperature of 35°C (95°F) on September 25, 2006.
- On September 28, 2010, St Mary saw its coldest September day with temperatures maxing out at 26°C (79°F).
- Nighttime temperatures dropped to 22°C (72°F) on September 29, 2010, marking the coldest September night on record.
Best Places in Jamaica in September
Find out more about the weather in Jamaica and which places have the best travel conditions in this month. See all of Jamaica in September →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in St Mary in September
Warm weather calls for comfortable, breathable clothing in September. Cotton t-shirts, shorts, light dresses, and sandals are perfect. You might still want a light layer for evenings or air-conditioned places (for example buses). High rain levels are expected, so pack waterproof gear and an umbrella or poncho. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.What To Do in St Mary in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Jamaica, check out our St Mary's climate page.
Temperature Rainfall Sunshine Humidity
See the full St Mary climate overview or explore weather in Jamaica.
