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September Weather in Old Harbour, Jamaica

Last updated: August 23, 2025

In September, the average temperature in Old Harbour, Jamaica is a warm 27°C (81°F), with a minimum of 24°C (75°F) and a maximum reaching up to 33°C (91°F). Expect 122 mm (4.8 in) of precipitation spread across 19 days, contributing to an average humidity of 77%. Enjoy the tropical vibes, but be prepared for the occasional shower!

September Temperature in Old Harbour

In September in Old Harbour, the average temperature is 27°C (81°F), with maximums reaching 33°C (91°F) and minimums dropping as low as 24°C (75°F). This pleasant weather makes it an ideal time for traveling and exploring the local attractions.

September Weather in Old Harbour: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Old Harbour, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Old Harbour, September typically has an average temperature of 27°C (81°F), with highs reaching up to 33°C (91°F) and lows dropping to around 24°C (75°F).
JanFebMarAprMayJunJulAugSepOctNovDec767677787981828281797877
Data source: Temperature data for Old Harbour generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Old Harbour

In Old Harbour in September, the precipitation amount is 122 mm (4.8 in) over a span of 19 days.

September Precipitation Trends in Old Harbour

The chart displays monthly precipitation patterns in Old Harbour, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Old Harbour, September typically receives around 122 mm (4.8 inches) of precipitation spread over approximately 19 days.
JanFebMarAprMayJunJulAugSepOctNovDec2524377111249389112218611028
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Old Harbour

In Old Harbour in September, humidity is 77%. With an average temperature of 27°C (81°F), this humidity feels like a warm blanket, making travel feel sticky and heavy, as sweat clings to the skin and the air becomes thick, causing you to long for refreshing breezes and cool shade.

September Average Humidity in Old Harbour

This chart illustrates the average monthly humidity levels in Old Harbour, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Old Harbour is approximately 77%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%76%75%76%77%79%79%78%77%76%78%77%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Old Harbour

In Old Harbour in September, the maximum UV index is 12, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, underscoring the importance of sun protection. For detailed information, you can check the Hourly UV Index in Old Harbour.

Maximum UV Index Levels in Old Harbour for September

The chart shows the monthly maximum UV Index (UVI) for Old Harbour in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Old Harbour typically reaches 12, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec911131413131313121298
Data source: Old Harbour September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How September Weather in Old Harbour Compares to Other Months

Weather in Old Harbour varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Old Harbour, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Old Harbour, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather25°C (77°F)25 mm (1.0 inches)76%very high
February Weather25°C (77°F)24 mm (0.9 inches)76%extreme
March Weather25°C (77°F)37 mm (1.4 inches)75%extreme
April Weather25°C (78°F)71 mm (2.8 inches)76%extreme
May Weather26°C (79°F)112 mm (4.4 inches)77%extreme
June Weather27°C (81°F)49 mm (1.9 inches)79%extreme
July Weather28°C (82°F)37 mm (1.5 inches)79%extreme
August Weather28°C (82°F)90 mm (3.6 inches)78%extreme
September Weather27°C (81°F)122 mm (4.8 inches)77%extreme
October Weather26°C (79°F)185 mm (7.3 inches)76%extreme
November Weather26°C (79°F)110 mm (4.3 inches)78%very high
December Weather25°C (78°F)28 mm (1.1 inches)77%very high

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