September weather forecast
Cabo Rojo, PR

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Weather in September

September weather in Cabo Rojo is a transition from the rains of August, with rainfall rates slightly reducing to 3.58" (91mm). However, the city continues to provide ample opportunities to make the most of the diverse weather. The inviting Cabo Rojo climate persistently encourages everyone to actively partake in the city's offerings.

Temperature

The shift from August to September is characterized by an average high-temperature of a still moderately hot 85.6°F (29.8°C), not significantly different from the 85.8°F (29.9°C) of August. Nighttime, during September, brings an average low of 78.6°F (25.9°C), a modest reduction from the day's peak.

Heat index

In September, the average heat index is calculated to be a very hot 96.8°F (36°C). Incorporate additional preventive steps, heat exhaustion and heat cramps are possible. Long-lasting activity may cause heatstroke.
Consider that heat index readings are for situations in the shade and light wind. Exposure to direct sunlight may make the heat index values climb by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'apparent temperature', combines air temperature and relative humidity to represent a human perceived temperature equivalent. One's perception of weather can be shaped by other factors, involving metabolic differences, pregnancy, and physical exertion. Do note, being directly under sun rays can amplify the heat you feel, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to babies and toddlers. Children frequently underestimate the necessity to rest and hydrate. Thirst is a late sign of dehydration - thus, it is vital to stay hydrated, particularly during lengthy physical exercises.
Perspiration, which is the evaporation of sweat, is a primary way the human body manages and dispels excessive warmth. When the level of relative humidity is elevated, evaporation diminishes, causing more warmth to be retained in the body than in dry air. Potential thermal conditions emerge as the body's heat gain outpaces its cooling mechanisms.

Humidity

In September, the average relative humidity is 77%.

Rainfall

September is the month with the most rainfall. Rain falls for 21.7 days and accumulates 3.58" (91mm) of precipitation.

Daylight

The average length of the day in September is 12h and 14min.
On the first day of the month, sunrise is at 6:14 am and sunset at 6:42 pm. On the last day of September, sunrise is at 6:18 am and sunset at 6:17 pm AST.

Sunshine

In Cabo Rojo, the average sunshine in September is 9.3h.

UV index

The months with the highest UV index are March through November, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high health hazard from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The maximum daily UV index of 7 during September translates into the following directions:
Avert overexposure. Light-skinned people might experience burning in less than 20 minutes. Avoid exposure to the Sun and try to stay in the shade between 10 a.m. and 4 p.m., when UV radiation is most potent, but be aware that parasols or canopies may not offer full protection. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure.

Frequently asked questions

How hot is September?

In Cabo Rojo, 85.6°F (29.8°C) is the average high-temperature and 78.6°F (25.9°C) is the average low-temperature during September. In September, the average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), which factors the actual air temperature with the relative humidity, is calculated to be 96.8°F (36°C).

What is the average humidity in September?

In Cabo Rojo, the average relative humidity in September is 77%.

What is the wettest month in Cabo Rojo?

September is the month with the most rainfall in Cabo Rojo. Rain falls for 21.7 days and accumulates 3.58" (91mm) of precipitation.

How many days does it rain in September?

In Cabo Rojo, in September, during 21.7 rainfall days, 3.58" (91mm) of precipitation is typically accumulated.

How many hours of daylight does Cabo Rojo have in September?

The average day length in September is 12h and 14min.

When are sunrise and sunset in September?

In September, on the first day of the month, sunrise is at 6:14 am and sunset at 6:42 pm. On the last day of the month, sunrise is at 6:18 am and sunset at 6:17 pm AST.

How many hours of sunshine does Cabo Rojo have in September?

The average sunshine duration in September is 9.3h.

When is the highest UV index?

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

How high is the UV index in September?

In Cabo Rojo, the average daily maximum UV index in September is 7. A UV Index value of 6 to 7 symbolizes a high health risk from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Cabo Rojo, PR

Average temperature in September - Cabo Rojo, PR
  • Average high temperature in September: 85.6°F

The warmest month (with the highest average high temperature) is August (85.8°F).
The month with the lowest average high temperature is January (81.3°F).

  • Average low temperature in September: 78.6°F

The months with the highest average low temperature are July and August (78.8°F).
The coldest month (with the lowest average low temperature) is February (73.4°F).

Average pressure in September
Cabo Rojo, PR

Average pressure in September - Cabo Rojo, PR
  • Average pressure in September: 29.91"Hg

The months with the highest atmospheric pressure are January and February (30.01"Hg).
The month with the lowest atmospheric pressure is October (29.89"Hg).

Average wind speed in September
Cabo Rojo, PR

Average wind speed in September - Cabo Rojo, PR
  • Average wind speed in September: 7.3mph

The windiest month (with the highest average wind speed) is July (8.7mph).
The calmest months (with the lowest average wind speed) are October and November (7mph).

Average humidity in September
Cabo Rojo, PR

Average humidity in September - Cabo Rojo, PR
  • Average humidity in September: 77%

The month with the highest relative humidity is November (78%).
The month with the lowest relative humidity is March (74%).

Average rainfall in September
Cabo Rojo, PR

Average rainfall in September - Cabo Rojo, PR
  • Average rainfall in September: 3.58"

The wettest month (with the highest rainfall) is September (3.58").
The driest month (with the least rainfall) is January (0.67").

Average rainfall days in September
Cabo Rojo, PR

Average rainfall days in September - Cabo Rojo, PR
  • Average rainfall days in September: 21.7 days

The month with the highest number of rainy days is May (24.3 days).
The month with the least rainy days is January (13.5 days).

Average daylight in September /
Average sunshine in September
Cabo Rojo, PR

Average daylight in September / Average sunshine in September - Cabo Rojo, 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 6min).

  • Average sunshine in September: 9h and 2min

The month with the most sunshine is June (Average sunshine: 11h and 12min).
The month with the least sunshine is November (Average sunshine: 7h and 6min).

Average sunshine days in September
Cabo Rojo, PR

Average sunshine days in September - Cabo Rojo, PR
  • Average sunshine days in September: 6.6 days

The month with the most sunshine days is January (13.5 days).
The month with the least sunshine days is May (4.7 days).

Average UV index in September
Cabo Rojo, PR

Average UV index in September - Cabo Rojo, PR
  • Average UV index in September: 7

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

Average cloud cover in September
Cabo Rojo, PR

Average cloud cover in September - Cabo Rojo, PR
  • Average cloud cover in September: 23

The month with the most cloud cover is May (Cloud cover 28).
The months with the least cloud cover are January, February and December (Cloud cover 20).

Average visibility in September
Cabo Rojo, PR

Average visibility in September - Cabo Rojo, 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).

Cabo Rojo, Puerto Rico, USA

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