September weather forecast
Runaway Bay, Jamaica

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Weather in September

The weather in September in Runaway Bay assumes a different behavior, with temperatures dropping slightly as compared to August. Rainfall increases in volume and frequency, implying the need for umbrellas when venturing outdoors. The slight drop in temperature doesn't effect the sea temperature, ensuring the possibility of continued aquatic activities. Despite the increasing clouds, the amount of sunshine remains consistent. Overall in September, temperatures swing from a high of 29.4°C (84.9°F) to a low of 26.2°C (79.2°F).

Temperature

The transition from August to September brings an average high-temperature of a still warm 29.4°C (84.9°F), barely different from August's 29.7°C (85.5°F). Nighttime temperatures hover around an average low of 26.2°C (79.2°F) in September, a slight descent from daytime highs.

Heat index

September's average heat index is calculated to be a torrid 35°C (95°F). More safety actions are required, heat exhaustion and heat cramps are probable. Long-term activity may precipitate heatstroke.
The standards for the heat index are set for locations in shade and under light breezes. The presence of direct sunlight can raise the heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'felt air temperature', is achieved by amalgamating air temperature with the relative humidity readings. An individual's temperature experience can be influenced by extra factors, including metabolic differences, activity levels, and clothing. When you're directly under the sun's rays, remember that the heat index may surge by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Young ones often do not realize the necessity to rest and replenish their fluids. Thirst is a delayed indication of dehydration - keeping hydrated, particularly in prolonged physical activity, is crucial.
Perspiring is how the human body naturally cools down, as sweat's evaporation takes away excess heat. Elevated relative humidity diminishes evaporation, thereby reducing the body's ability to shed heat and creating a feeling of being too warm. Should the body fail to balance its heat gain, the escalating temperature poses health challenges.

Humidity

In Runaway Bay, the average relative humidity in September is 78%.

Rainfall

In Runaway Bay, during September, the rain falls for 18.2 days and regularly aggregates up to 88mm (3.46") of precipitation. Throughout the year, in Runaway Bay, there are 219.4 rainfall days, and 663mm (26.1") of precipitation is accumulated.

Snowfall

The only month with snowfall is September. The month with the most snowfall in Runaway Bay is September, when snow falls for 0.1 days and typically aggregates up to 1mm (0.04") of snow.

Sea temperature

June through November, with an average sea temperature of 29°C (84.2°F), are months with the warmest seawater in Runaway Bay, Jamaica.
Note: In water temperatures ranging between 25°C (77°F) and 29°C (84.2°F), activities such as swimming and diving become highly pleasurable for long durations.

Daylight

The average length of the day in September is 12h and 14min.
On the first day of the month, sunrise is at 05:54 and sunset at 18:23. On the last day of September, sunrise is at 05:59 and sunset at 17:58 EST.

Sunshine

August and September, with an average of 11.3h of sunshine, are months with the most sunshine.

UV index

April through December, with an average maximum UV index of 7, are months with the highest UV index in Runaway Bay. A UV Index value of 6 to 7 symbolizes a high health hazard from exposure to the Sun's UV rays for average individuals.
Note: A daily maximum UV index of 7 in September translates into the following instructions:
Ward off overexposure. Defence against solar harm is crucial. The Sun emits the most powerful UV radiation between 10 a.m. and 4 p.m. Try to avoid direct sunlight during this period. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat. Bear in mind! The Sun's UV radiation can nearly double in intensity due to the reflective quality of snow.

Frequently asked questions

How hot is it in Runaway Bay in September?

In Runaway Bay, 29.4°C (84.9°F) is the average high-temperature and 26.2°C (79.2°F) is the average low-temperature during September. In September, the average heat index (a.k.a. 'feels like', 'real feel'), which takes the relative humidity and factors it into the air temperature reading, is calculated to be 35°C (95°F).

What is the average humidity in September in Runaway Bay?

The average relative humidity in September is 78%.

How many days does it rain in September in Runaway Bay?

In Runaway Bay, Jamaica, in September, during 18.2 rainfall days, 88mm (3.46") of precipitation is typically accumulated.

What is the snowiest month in Runaway Bay?

September is the month with the most snowfall in Runaway Bay. Snow falls for 0.1 days and accumulates 1mm (0.04") of snow.

When does it start to snow in Runaway Bay?

September is the first month it typically snows in Runaway Bay, Jamaica. Throughout September, in the average 0.1 snowfall days, it receives 1mm (0.04") of snow.

What months are the sea warmest in Runaway Bay?

The months with the warmest seawater in Runaway Bay are June through November, with an average sea temperature of 29°C (84.2°F).

How warm is the water in September in Runaway Bay?

In Runaway Bay, in September, the average water temperature is 29°C (84.2°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 Runaway Bay have in September?

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

When is the sunrise / sunset in September in Runaway Bay?

In September, on the first day of the month, sunrise is at 05:54 and sunset at 18:23. On the last day of the month, in Runaway Bay, sunrise is at 05:59 and sunset at 17:58 EST.

What are the months with the most sunshine in Runaway Bay?

August and September, with an average of 11.3h of sunshine, are months with the most sunshine in Runaway Bay.

How many hours of sunshine does Runaway Bay have in September?

In Runaway Bay, the average sunshine duration in September is 11.3h.

When is the highest UV index in Runaway Bay?

April through December, with an average maximum UV index of 7, are months with the highest UV index in Runaway Bay, Jamaica.

How high is the UV index in September in Runaway Bay?

In September, the average daily maximum UV index in Runaway Bay is 7. A UV Index of 6 to 7 symbolizes a high health threat from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover

Average temperature in September
Runaway Bay, Jamaica

Average temperature in September - Runaway Bay, Jamaica
  • Average high temperature in September: 29.4°C

The warmest month (with the highest average high temperature) is August (29.7°C).
The months with the lowest average high temperature are February and March (26.6°C).

  • Average low temperature in September: 26.2°C

The month with the highest average low temperature is August (26.3°C).
The coldest month (with the lowest average low temperature) is March (23.1°C).

Average pressure in September
Runaway Bay, Jamaica

Average pressure in September - Runaway Bay, Jamaica
  • Average pressure in September: 1012.4mbar

The month with the highest atmospheric pressure is January (1015.7mbar).
The month with the lowest atmospheric pressure is October (1011.6mbar).

Average wind speed in September
Runaway Bay, Jamaica

Average wind speed in September - Runaway Bay, Jamaica
  • Average wind speed in September: 13.3km/h

The windiest month (with the highest average wind speed) is June (17.9km/h).
The calmest month (with the lowest average wind speed) is October (13.2km/h).

Average humidity in September
Runaway Bay, Jamaica

Average humidity in September - Runaway Bay, Jamaica
  • Average humidity in September: 78%

The months with the highest relative humidity are May, June, November and December (79%).
The month with the lowest relative humidity is March (77%).

Average rainfall in September
Runaway Bay, Jamaica

Average rainfall in September - Runaway Bay, Jamaica
  • Average rainfall in September: 88mm

The wettest month (with the highest rainfall) is October (95mm).
The driest month (with the least rainfall) is February (27mm).

Average rainfall days in September
Runaway Bay, Jamaica

Average rainfall days in September - Runaway Bay, Jamaica
  • Average rainfall days in September: 18.2 days

The month with the highest number of rainy days is October (23.9 days).
The month with the least rainy days is February (15 days).

Average snowfall in September
Runaway Bay, Jamaica

Average snowfall in September - Runaway Bay, Jamaica
  • Average snowfall in September: 1mm

The month with the highest snowfall is September (1mm).
The months with the least snowfall are January, February, March, April, May, June, July, August, October, November and December (0mm).

Average snowfall days in September
Runaway Bay, Jamaica

Average snowfall days in September - Runaway Bay, Jamaica
  • Average snowfall days in September: 0.1 days

The month with the highest number of snowfall days is September (0.1 days).
The months with the least snowfall days are January, February, March, April, May, June, July, August, October, November and December (0 days).

Average sea temperature in September
Runaway Bay, Jamaica

Average sea temperature in September - Runaway Bay, Jamaica
  • Average sea temperature in September: 29°C

The best months for swimming (with the highest average sea temperature) are June, July, August, September, October and November (29°C).
The coldest months (with the lowest average sea temperature) are January, February, March and April (27°C).

Average daylight in September /
Average sunshine in September
Runaway Bay, Jamaica

Average daylight in September / Average sunshine in September - Runaway Bay, 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 0min).

  • Average sunshine in September: 11h and 2min

The months with the most sunshine are August and September (Average sunshine: 11h and 18min).
The month with the least sunshine is December (Average sunshine: 6h and 30min).

Average sunshine days in September
Runaway Bay, Jamaica

Average sunshine days in September - Runaway Bay, Jamaica
  • Average sunshine days in September: 3.6 days

The month with the most sunshine days is January (9.6 days).
The month with the least sunshine days is May (3.4 days).

Average UV index in September
Runaway Bay, Jamaica

Average UV index in September - Runaway Bay, Jamaica
  • Average UV index in September: 7

The months with the highest UV index are April, May, June, July, August, September, October, November and December (UV index 7).
The months with the lowest UV index are January, February and March (UV index 6).

Average cloud cover in September
Runaway Bay, Jamaica

Average cloud cover in September - Runaway Bay, Jamaica
  • Average cloud cover in September: 22

The months with the most cloud cover are November and December (Cloud cover 33).
The month with the least cloud cover is September (Cloud cover 22).

Average visibility in September
Runaway Bay, Jamaica

Average visibility in September - Runaway Bay, Jamaica
  • Average visibility in September: 10km

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).

Runaway Bay, Jamaica

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