September weather forecast
Black River, Jamaica

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Weather in September

September in Black River experiences the last phase of the tropical heat, with temperatures sliding from their absolute peak to a still warm range of 21.8°C (71.2°F) to 29.3°C (84.7°F). Rainfall provides the stark contrast to the receding heat, receiving its annual peak at 190mm (7.48"). While sea temperatures remain inviting, daylight hours and sunshine begin to reduce. The weather pattern this month is a definite sign of the transitioning season.

Temperature

The arrival of September records an average high-temperature of a warm 29.3°C (84.7°F), closely related to the 30°C (86°F) observed in August. Black River encounters an average low-temperature of 21.8°C (71.2°F) during September nights.

Heat index

In September, the average heat index is estimated at a very hot 37°C (98.6°F). Implement additional safety measures to avoid heat cramps and heat exhaustion. Persistent activity might trigger heatstroke.
Regarding the heat index, one should be aware it's determined by shaded settings and mild winds. Heat index values may surge by up to 15 Fahrenheit (8 Celsius) degrees in the presence of direct sunlight.
Note: The heat index, also known as 'apparent temperature' or 'real feel', is a numerical representation of warmth when taking temperature and moisture levels into account. The influence of weather can be personal, changing with an individual's body mass, height, and level of physical exertion. Taking into account that direct sunlight can boost the heat effect, the heat index may rise by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly important for children. Young kids are often more at risk than adults as they tend to perspire less. Besides, their skin surface is larger relative to their small bodies, and their increased heat output from their active lifestyle compounds their risk.
One of the main methods the human body employs to cool down is by perspiring, as this process allows sweat to evaporate and remove excess heat. Under conditions of high temperature and humidity (enhanced heat index), sweat production is compromised, exacerbating the sensation of warmth. When body heat isn't effectively managed, risks of dehydration and overheating amplify.

Humidity

In September, the average relative humidity in Black River, Jamaica, is 85%.

Rainfall

In Black River, in September, during 27.3 rainfall days, 190mm (7.48") of precipitation is typically accumulated. Throughout the year, in Black River, there are 297.9 rainfall days, and 1472mm (57.95") of precipitation is accumulated.

Sea temperature

With an average sea temperature of 29.8°C (85.6°F), September is the month with the warmest seawater.
Note: For swimming, diving, and various water activities, the temperatures ranging from 25°C (77°F) to 29°C (84.2°F) are seen as highly enjoyable and comfortable for extended durations without any discomfort.

Daylight

The average length of the day in September in Black River is 12h and 14min.
On the first day of September, sunrise is at 05:57 and sunset at 18:25. On the last day of the month, sunrise is at 06:01 and sunset at 18:00 EST.

Sunshine

In September, the average sunshine in Black River is 9.8h.

UV index

The average daily maximum UV index in September in Black River is 6. A UV Index estimate of 6 to 7 represents a high health vulnerability from unsafe exposure to UV radiation for the average person.
Note: The maximum daily UV index of 6 in September converts into the following recommendations:
Resist overexposure. Safeguarding from solar damage is indispensable. Minimize exposure to direct sunlight and seek shade from 10 a.m. to 4 p.m., when UV radiation is most intense, but remember that shade structures may not offer complete protection. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades. Beware! Reflections from sand and water can intensify the Sun's UV radiation.
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Frequently asked questions

How hot does it get in Black River in September?

The average high-temperature and low-temperature during September are 29.3°C (84.7°F) and 21.8°C (71.2°F) respectively. In September, the average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which combines air temperature and relative humidity, is estimated at 37°C (98.6°F).

What is the average humidity in September in Black River?

In September, the average relative humidity is 85%.

How much does it rain in Black River in September?

In Black River, in September, it is raining for 27.3 days, with typically 190mm (7.48") of accumulated precipitation.

When is the sea warmest in Black River?

With an average sea temperature of 29.8°C (85.6°F), September is the month with the warmest seawater.

How warm is the water in September in Black River?

In September, the average sea temperature in Black River, Jamaica, is 29.8°C (85.6°F). Water temperature between 25°C (77°F) and 29°C (84.2°F) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

How many hours of daylight does Black River have in September?

In September, the average day length in Black River is 12h and 14min.

When is the sunrise / sunset in September in Black River?

On the first day of September in Black River, Jamaica, sunrise is at 05:57 and sunset at 18:25. On the last day of the month, sunrise is at 06:01 and sunset at 18:00 EST.

How long on average sun shines in September in Black River?

The average sunshine duration in September in Black River is 9.8h.

What is the UV index reading in September in Black River?

In September, the average daily maximum UV index in Black River, Jamaica, is 6. A UV Index of 6 to 7 symbolizes a high health threat from exposure to the Sun's UV radiation.

Average temperature in September
Black River, Jamaica

Average temperature in September - Black River, Jamaica
  • Average high temperature in September: 29.3°C

The warmest month (with the highest average high temperature) is August (30°C).
The month with the lowest average high temperature is January (27°C).

  • Average low temperature in September: 21.8°C

The month with the highest average low temperature is August (21.9°C).
The coldest month (with the lowest average low temperature) is February (18.6°C).

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Average pressure in September
Black River, Jamaica

Average pressure in September - Black River, Jamaica
  • Average pressure in September: 1012.2mbar

The month with the highest atmospheric pressure is January (1015.5mbar).
The month with the lowest atmospheric pressure is October (1011.5mbar).

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Average wind speed in September
Black River, Jamaica

Average wind speed in September - Black River, Jamaica
  • Average wind speed in September: 6.6km/h

The windiest month (with the highest average wind speed) is June (9.4km/h).
The calmest month (with the lowest average wind speed) is November (6.2km/h).

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Average humidity in September
Black River, Jamaica

Average humidity in September - Black River, Jamaica
  • Average humidity in September: 85%

The month with the highest relative humidity is October (87%).
The months with the lowest relative humidity are March and July (81%).

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Average rainfall in September
Black River, Jamaica

Average rainfall in September - Black River, Jamaica
  • Average rainfall in September: 190mm

The wettest month (with the highest rainfall) is October (228mm).
The driest month (with the least rainfall) is January (56mm).

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Average rainfall days in September
Black River, Jamaica

Average rainfall days in September - Black River, Jamaica
  • Average rainfall days in September: 27.3 days

The month with the highest number of rainy days is October (28.7 days).
The month with the least rainy days is June (21.1 days).

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Average sea temperature in September
Black River, Jamaica

Average sea temperature in September - Black River, Jamaica
  • Average sea temperature in September: 29.8°C

The best month for swimming (with the highest average sea temperature) is September (29.8°C).
The coldest month (with the lowest average sea temperature) is February (26.9°C).

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Average daylight in September /
Average sunshine in September
Black River, Jamaica

Average daylight in September / Average sunshine in September - Black River, Jamaica
  • Average daylight in September: 12h and 1min

The month with the longest days is June (Average daylight: 13h and 12min).
The month with the shortest days is December (Average daylight: 11h and 6min).

  • Average sunshine in September: 9h and 5min

The months with the most sunshine are July and August (Average sunshine: 10h and 24min).
The month with the least sunshine is November (Average sunshine: 6h and 6min).

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Average sunshine days in September
Black River, Jamaica

Average sunshine days in September - Black River, Jamaica
  • Average sunshine days in September: 1.9 days

The month with the most sunshine days is June (7.6 days).
The months with the least sunshine days are September and November (1.9 days).

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Average UV index in September
Black River, Jamaica

Average UV index in September - Black River, Jamaica
  • Average UV index in September: 6

The months with the highest UV index are June and July (UV index 7).
The month with the lowest UV index is October (UV index 5).

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Average cloud cover in September
Black River, Jamaica

Average cloud cover in September - Black River, Jamaica
  • Average cloud cover in September: 40

The months with the most cloud cover are May and November (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 35).

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Average visibility in September
Black River, Jamaica

Average visibility in September - Black River, Jamaica
  • Average visibility in September: 7km

The months with the highest visibility are March, June, July and August (8km).
The months with the lowest visibility are November and December (6km).

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Black River, Jamaica

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