September weather forecast
Toa Alta, PR

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Weather in September

September in Toa Alta signals the onset of the transition period from the hot to the cooler months. The temperature decline is gradual and moderate, bringing slight relief from the summer's peak heat. Changes in wind speed are also noticeable, indicating the upcoming shift in the season. The quantum of rainfall is high, accounting for a greener and fresher environment. The noteworthy climatic event of September is the considerable rainfall, recorded at a substantial 3.62" (92mm), indicating the wet season presence.

Temperature

With September's arrival, Toa Alta notes an average high-temperature of a still moderately hot 85.1°F (29.5°C), closely following the trend of the preceding month. Recording a slight drop from the daily maximum, Toa Alta notes an average low temperature of 78.4°F (25.8°C) in the month of September.

Heat index

For September, the heat index is computed to be a sweltering 96.8°F (36°C). Implement additional preventive actions, heat cramps and heat exhaustion are potential hazards. Heatstroke could follow prolonged activity.
It is crucial to understand that heat index figures are for shade and gentle wind conditions. Direct exposure to sunshine could lead to a heat index increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', shows a temperature sensation when both heat and moisture conditions are combined. Additional elements encompassing metabolic differences, the degree of physical activity, and attire can impact the individual's perception of temperature. Consider that direct sun exposure can intensify the felt heat, adding potentially 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values hold particular significance for children. Children often fail to understand the importance of rest and rehydration. Thirst is a late manifestation of dehydration - hence, it is crucial to stay hydrated, especially during ongoing physical activities.
The human body normally cools itself by perspiration. Excessive warmth is eliminated from the body by evaporation of sweat. Under high air temperature and high humidity (high heat index) conditions, the body's ability to perspire is compromised, increasing the sensation of heat. When heat uptake goes beyond the body's cooling mechanisms, there's a surge in body temperature, posing health risks.

Humidity

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

Rainfall

In Toa Alta, in September, during 20.4 rainfall days, 3.62" (92mm) of precipitation is typically accumulated. Throughout the year, in Toa Alta, there are 223.5 rainfall days, and 27.95" (710mm) of precipitation is accumulated.

Daylight

In September, the average length of the day in Toa Alta is 12h and 14min.
On the first day of the month, sunrise is at 6:10 am and sunset at 6:38 pm. On the last day of September, in Toa Alta, sunrise is at 6:15 am and sunset at 6:14 pm AST.

Sunshine

The average sunshine in September in Toa Alta is 9.4h.

UV index

The months with the highest UV index are May through November, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high health vulnerability from unprotected exposure to Sun's UV rays for the average person.
Note: The UV index of 7 in September translates into these instructions:
Deflect overexposure. Sun protection is a necessity. Limit your direct sun exposure, especially between 10 a.m. and 4 p.m., when UV radiation is strongest. Shade structures might not provide complete sun protection. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears.
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Frequently asked questions

Is it hot in Toa Alta during September?

In Toa Alta, 85.1°F (29.5°C) is the average high-temperature and 78.4°F (25.8°C) is the average low-temperature during September. The average heat index (a.k.a. 'feels like', 'apparent temperature'), which takes the relative humidity and factors it into the air temperature reading, in September is computed to be 96.8°F (36°C).

What is the average humidity in September in Toa Alta?

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

How many days does it rain in September in Toa Alta?

In Toa Alta, during September, the rain falls for 20.4 days and regularly aggregates up to 3.62" (92mm) of precipitation.

What is the average length of the day in September in Toa Alta?

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

When is the sunrise / sunset in September in Toa Alta?

On the first day of September in Toa Alta, Puerto Rico, sunrise is at 6:10 am and sunset at 6:38 pm. On the last day of the month, sunrise is at 6:15 am and sunset at 6:14 pm AST.

How long on average sun shines in September in Toa Alta?

In September, the average sunshine duration is 9.4h.

What is the month with the highest UV index in Toa Alta?

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

What is the UV index reading in September in Toa Alta?

In September, the average daily maximum UV index in Toa Alta is 7. A UV Index reading of 6 to 7 represents a high hazard to health from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Toa Alta, PR

Average temperature in September - Toa Alta, PR
  • Average high temperature in September: 85.1°F

The warmest month (with the highest average high temperature) is August (85.5°F).
The month with the lowest average high temperature is January (79.9°F).

  • Average low temperature in September: 78.4°F

The months with the highest average low temperature are August, September and October (78.4°F).
The coldest month (with the lowest average low temperature) is March (73°F).

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Average pressure in September
Toa Alta, PR

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

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

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Average wind speed in September
Toa Alta, PR

Average wind speed in September - Toa Alta, PR
  • Average wind speed in September: 7.6mph

The windiest month (with the highest average wind speed) is July (10mph).
The calmest month (with the lowest average wind speed) is October (6.8mph).

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Average humidity in September
Toa Alta, PR

Average humidity in September - Toa Alta, PR
  • Average humidity in September: 78%

The months with the highest relative humidity are May, June, July and November (79%).
The month with the lowest relative humidity is March (76%).

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Average rainfall in September
Toa Alta, PR

Average rainfall in September - Toa Alta, PR
  • Average rainfall in September: 3.62"

The wettest month (with the highest rainfall) is October (3.82").
The driest month (with the least rainfall) is February (0.94").

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Average rainfall days in September
Toa Alta, PR

Average rainfall days in September - Toa Alta, PR
  • Average rainfall days in September: 20.4 days

The month with the highest number of rainy days is October (24 days).
The months with the least rainy days are January and February (14.2 days).

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Average daylight in September /
Average sunshine in September
Toa Alta, PR

Average daylight in September / Average sunshine in September - Toa Alta, 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 months with the most sunshine are May and June (Average sunshine: 10h and 48min).
The month with the least sunshine is November (Average sunshine: 6h and 42min).

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Average sunshine days in September
Toa Alta, PR

Average sunshine days in September - Toa Alta, PR
  • Average sunshine days in September: 5.3 days

The month with the most sunshine days is January (9.8 days).
The months with the least sunshine days are October and November (3.5 days).

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Average UV index in September
Toa Alta, PR

Average UV index in September - Toa Alta, PR
  • Average UV index in September: 7

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

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Average cloud cover in September
Toa Alta, PR

Average cloud cover in September - Toa Alta, PR
  • Average cloud cover in September: 26

The months with the most cloud cover are May, July and November (Cloud cover 34).
The month with the least cloud cover is September (Cloud cover 26).

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Average visibility in September
Toa Alta, PR

Average visibility in September - Toa Alta, 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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Toa Alta, Puerto Rico, USA

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