September weather forecast
Vega Baja, PR

Weather in September

The first month of the autumn, September, is still a warm month in Vega Baja, Puerto Rico, with an average temperature varying between 85.5°F (29.7°C) and 78.3°F (25.7°C).

Temperature

In Vega Baja, the average high-temperature in September is relatively the same as in August - a still moderately hot 85.5°F (29.7°C). In Vega Baja, the average low-temperature is 78.3°F (25.7°C).

Heat index

In September, the average heat index is estimated at a very hot 96.8°F (36°C). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Note that heat index values are valued for light wind and location in the shade. With exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel', 'apparent temperature', 'feels like', or 'felt air temperature', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. Additional factors like activity, wind, differences in body mass, height, and shape, and clothing affect individual temperature impact. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.
Perspiration is the human body's physiological response to high temperatures and is an attempt to lower body temperature through evaporation of sweat. Under high air temperature and humidity (high heat index) conditions, perspiration is limited, and the perception of heat is increased. When heat gain exceeds the level the body can remove, body temperature begins to rise, and heat-related illnesses and disorders may develop.

Humidity

In September, the average relative humidity is 78%.

Rainfall

In Vega Baja, during 19.5 rainfall days, 3.94" (100mm) of precipitation is typically accumulated. Throughout the year, there are 213.7 rainfall days, and 28.66" (728mm) of precipitation is accumulated.

Daylight

In Vega Baja, the average length of the day in September is 12h and 14min.
On the first day of the month, sunrise is at 6:10 am and sunset at 6:40 pm. On the last day of September, in Vega Baja, sunrise is at 6:15 am and sunset at 6:15 pm AST.

Sunshine

The average sunshine in September is 9.4h.

UV index

The months with the highest UV index in Vega Baja are April through November, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV rays for the ordinary person.
Note: The daily maximum UV index of 7 in September interpret into the following advice:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the temperature in September in Vega Baja?

In September, in Vega Baja, the average high-temperature is 85.5°F (29.7°C), and the average low-temperature is 78.3°F (25.7°C). in September, the average heat index (a.k.a. 'feels like', 'apparent temperature'), which combines air temperature and relative humidity, is estimated at 96.8°F (36°C).

What is the average humidity in September in Vega Baja?

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

How many days does it rain in September in Vega Baja?

In Vega Baja, Puerto Rico, in September, it is raining for 19.5 days, with typically 3.94" (100mm) of accumulated precipitation.

What is the average length of the day in September in Vega Baja?

In September, the average day length in Vega Baja, Puerto Rico, is 12h and 14min.

When are sunrise and sunset in September in Vega Baja?

In September, on the first day of the month, sunrise is at 6:10 am and sunset at 6:40 pm. On the last day of the month, in Vega Baja, sunrise is at 6:15 am and sunset at 6:15 pm AST.

How many hours of sunshine does Vega Baja have in September?

In Vega Baja, Puerto Rico, the average sunshine duration in September is 9.4h.

When is the highest UV index in Vega Baja?

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

What is the UV index reading in September in Vega Baja?

In Vega Baja, the average daily maximum UV index in September is 7. A UV Index value of 6 to 7 symbolizes a high hazard to health from unprotected exposure to UV radiation.

Average temperature in September
Vega Baja, PR

Average temperature in September - Vega Baja, 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).

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Average pressure in September
Vega Baja, PR

Average pressure in September - Vega Baja, 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).

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Average wind speed in September
Vega Baja, PR

Average wind speed in September - Vega Baja, 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).

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Average humidity in September
Vega Baja, PR

Average humidity in September - Vega Baja, 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%).

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Average rainfall in September
Vega Baja, PR

Average rainfall in September - Vega Baja, 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").

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Average rainfall days in September
Vega Baja, PR

Average rainfall days in September - Vega Baja, 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).

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Average daylight in September /
Average sunshine in September
Vega Baja, PR

Average daylight in September / Average sunshine in September - Vega Baja, PR
  • Average daylight in September: 12h and 14min

The month with the longest days is June (Average daylight: 13h and 13min).
The month with the shortest days is December (Average daylight: 11h and 3min).

  • Average sunshine in September: 9h and 24min

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).

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Average sunshine days in September
Vega Baja, PR

Average sunshine days in September - Vega Baja, 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).

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Average UV index in September
Vega Baja, PR

Average UV index in September - Vega Baja, 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).

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Average cloud cover in September
Vega Baja, PR

Average cloud cover in September - Vega Baja, 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).

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Average visibility in September
Vega Baja, PR

Average visibility in September - Vega Baja, 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).

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