September weather forecast
Barceloneta, PR

Share

Weather in September

September in Barceloneta marks the beginning of the transition towards the end of the year, with minor decreases in temperature. Notably, the sea temperature remains high, perfect for a late-summer dip. The most significant change comes in the form of rainfall, where the city experiences the second-highest amount of 3.94" (100mm). Despite the continuation of the wet season, the magnificent charm of Barceloneta remains undeterred.

Temperature

In September, Barceloneta experiences a minor shift in meteorological conditions with average high-temperatures marked at a still warm 85.5°F (29.7°C), closely mirroring the climate in August. The September average low temperature, marginally lower than the daytime high, records at a still warm 78.3°F (25.7°C).

Heat index

The average heat index in September is estimated at a fiery hot 96.8°F (36°C). Incorporate special precautions, risk of heat exhaustion and heat cramps is substantial. Sustained activity could cause heatstroke.
Note that heat index values are valued for light wind and location in the shade. Direct sunlight might lead to a heat index increase by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', measures the perceived warmth when incorporating the humidity present in the air. This effect tends to be personal, with the weather perception differing among individuals due to variations in body mass, height, and exertion. Direct sunlight exposure should be noted as it has the potential to increase the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to babies and toddlers. 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.
The human body cools itself through perspiration, as excessive warmth is removed from the body through sweat evaporation. An elevated level of relative humidity hinders evaporation, leading to decreased heat elimination from the body, inducing a sensation of excess heat. Increasing body temperatures can be a precursor to dehydration if the body can't shed the extra heat.

Humidity

In September, the average relative humidity is 78%.

Rainfall

In Barceloneta, Puerto Rico, in September, it is raining for 19.5 days, with typically 3.94" (100mm) of accumulated precipitation. In Barceloneta, during the entire year, the rain falls for 213.7 days and collects up to 28.66" (728mm) of precipitation.

Ocean temperature

With an average ocean temperature of 84.9°F (29.4°C), September is the month with the warmest seawater in Barceloneta.
Note: For any water activity, surface water temperatures between 77°F (25°C) and 84.2°F (29°C) are considered as excellent and extremely pleasant for lengthened periods.

Daylight

In Barceloneta, the average length of the day in September is 12h and 14min.
On the first day of September, sunrise is at 6:11 am and sunset at 6:40 pm. On the last day of the month, sunrise is at 6:16 am and sunset at 6:15 pm AST.

Sunshine

In Barceloneta, the average sunshine in September is 9.4h.

UV index

April through November, with an average maximum UV index of 7, are months with the highest UV index. A UV Index value of 6 to 7 symbolizes a high threat to health from unprotected exposure to Sun's UV rays for the average person.
Note: In September, the maximum UV index of 7 translates into these guidelines:
Inhibit overexposure. Warding off sun damage is of utmost importance. Be aware that the sun's UV radiation is strongest between 10 a.m. and 4 p.m. and try to reduce direct sun exposure during this period as much as possible. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses. Take caution! The UV rays from the Sun gain strength from sand and water reflections.
[Resources]

Frequently asked questions

How hot is it in Barceloneta in September?

The average high-temperature and low-temperature in Barceloneta, Puerto Rico, during September are 85.5°F (29.7°C) and 78.3°F (25.7°C) respectively. In September, the average heat index (a.k.a. 'felt air temperature', 'feels like'), which combines air temperature and relative humidity, is estimated at 96.8°F (36°C).

What is the average humidity in September in Barceloneta?

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

How many days does it rain in September in Barceloneta?

In Barceloneta, Puerto Rico, during September, the rain falls for 19.5 days and regularly aggregates up to 3.94" (100mm) of precipitation.

What month is the ocean warmest in Barceloneta?

The month with the warmest seawater is September, with an average ocean temperature of 84.9°F (29.4°C).

What is the water temperature in September in Barceloneta?

In Barceloneta, in September, the average water temperature is 84.9°F (29.4°C). Water temperature between 77°F (25°C) and 84.2°F (29°C) 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 Barceloneta have in September?

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

When are sunrise and sunset in September in Barceloneta?

In September, on the first day of the month, sunrise is at 6:11 am and sunset at 6:40 pm. On the last day of the month, in Barceloneta, Puerto Rico, sunrise is at 6:16 am and sunset at 6:15 pm AST.

How long on average sun shines in September in Barceloneta?

The average sunshine duration in September in Barceloneta is 9.4h.

What is the month with the highest UV index in Barceloneta?

The months with the highest UV index are April through November, with an average maximum UV index of 7.

What is the UV index reading in September in Barceloneta?

In Barceloneta, Puerto Rico, the average daily maximum UV index in September is 7. A UV Index estimate of 6 to 7 represents a high health risk from unsafe exposure to Sun's UV rays.

Average temperature in September
Barceloneta, PR

Average temperature in September - Barceloneta, PR
  • Average high temperature in September: 85.5°F

The warmest month (with the highest average high temperature) is August (85.6°F).
The month with the lowest average high temperature is March (80.2°F).

  • Average low temperature in September: 78.3°F

The month with the highest average low temperature is August (78.4°F).
The coldest month (with the lowest average low temperature) is March (72.5°F).

[Resources]

Average pressure in September
Barceloneta, PR

Average pressure in September - Barceloneta, PR
  • Average pressure in September: 29.92"Hg

The month with the highest atmospheric pressure is January (30.02"Hg).
The month with the lowest atmospheric pressure is October (29.9"Hg).

[Resources]

Average wind speed in September
Barceloneta, PR

Average wind speed in September - Barceloneta, PR
  • Average wind speed in September: 7.4mph

The windiest month (with the highest average wind speed) is July (9.9mph).
The calmest month (with the lowest average wind speed) is October (6.8mph).

[Resources]

Average humidity in September
Barceloneta, PR

Average humidity in September - Barceloneta, PR
  • Average humidity in September: 78%

The months with the highest relative humidity are May, June, July, October and November (79%).
The months with the lowest relative humidity are February, March and April (77%).

[Resources]

Average rainfall in September
Barceloneta, PR

Average rainfall in September - Barceloneta, PR
  • Average rainfall in September: 3.94"

The wettest month (with the highest rainfall) is May (4.02").
The driest month (with the least rainfall) is February (0.91").

[Resources]

Average rainfall days in September
Barceloneta, PR

Average rainfall days in September - Barceloneta, PR
  • Average rainfall days in September: 19.5 days

The month with the highest number of rainy days is May (22.9 days).
The month with the least rainy days is January (13.3 days).

[Resources]

Average sea temperature in September
Barceloneta, PR

Average sea temperature in September - Barceloneta, PR
  • Average sea temperature in September: 85°F

The best month for swimming (with the highest average sea temperature) is September (85°F).
The coldest month (with the lowest average sea temperature) is February (79.1°F).

[Resources]

Average daylight in September /
Average sunshine in September
Barceloneta, PR

Average daylight in September / Average sunshine in September - Barceloneta, PR
  • 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: 9h and 2min

The month with the most sunshine is June (Average sunshine: 10h and 54min).
The month with the least sunshine is November (Average sunshine: 6h and 48min).

[Resources]

Average sunshine days in September
Barceloneta, PR

Average sunshine days in September - Barceloneta, PR
  • Average sunshine days in September: 7.3 days

The month with the most sunshine days is January (12.3 days).
The month with the least sunshine days is May (5.9 days).

[Resources]

Average UV index in September
Barceloneta, PR

Average UV index in September - Barceloneta, PR
  • Average UV index in September: 7

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

[Resources]

Average cloud cover in September
Barceloneta, PR

Average cloud cover in September - Barceloneta, PR
  • Average cloud cover in September: 25

The month with the most cloud cover is May (Cloud cover 34).
The month with the least cloud cover is September (Cloud cover 25).

[Resources]

Average visibility in September
Barceloneta, PR

Average visibility in September - Barceloneta, PR
  • Average visibility in September: 6mi

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

[Resources]

Barceloneta, Puerto Rico, USA

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location