September weather forecast
Fajardo, PR

Weather in September

The first month of the autumn, September, is also a moderately hot month in Fajardo, Puerto Rico, with an average temperature varying between 84°F (28.9°C) and 80.8°F (27.1°C).

Temperature

In Fajardo, the average high-temperature in September is almost the same as in August - a still warm 84°F (28.9°C). In Fajardo, the average low-temperature is 80.8°F (27.1°C).

Heat index

The average heat index in September is evaluated at a hot 93.2°F (34°C). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel', 'felt air temperature', 'feels like', or 'apparent temperature', is calculated by taking the relative humidity value for a specific location and factoring it into the air temperature reading. Additional factors like clothing, wind, differences in body mass, height, and shape, and activity influence one's weather impression. 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 especially crucial for babies and toddlers. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.

Humidity

In Fajardo, Puerto Rico, the average relative humidity in September is 78%.

Rainfall

In Fajardo, during September, the rain falls for 19.6 days and regularly aggregates up to 1.77" (45mm) of precipitation. In Fajardo, during the entire year, the rain falls for 216 days and collects up to 21.5" (546mm) of precipitation.

Ocean temperature

With an average ocean temperature of 84.9°F (29.4°C), September is the month with the warmest seawater.
Note: For swimming, diving, and other water activities, temperatures between 77°F (25°C) and 84.2°F (29°C) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

Daylight

The average length of the day in September in Fajardo is 12h and 14min.
On the first day of the month, sunrise is at 6:08 am and sunset at 6:36 pm. On the last day of September, sunrise is at 6:12 am and sunset at 6:12 pm AST.

Sunshine

In September, the average sunshine is 9.1h.

UV index

The months with the highest UV index are January, March through December, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high health vulnerability from unsafe exposure to UV radiation for the ordinary person.
Note: In September, the average maximum UV index of 7 translate into the following recommendations:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.
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FAQ

What is the temperature in September in Fajardo?

In September, the average high-temperature is 84°F (28.9°C), and the average low-temperature is 80.8°F (27.1°C). The average heat index (a.k.a. 'felt air temperature', 'feels like'), which calculates the temperature value influenced by the moisture in the air, in September is evaluated at 93.2°F (34°C).

What is the average humidity in September in Fajardo?

The average relative humidity in September in Fajardo is 78%.

How much does it rain in Fajardo in September?

In Fajardo, Puerto Rico, in September, it is raining for 19.6 days, with typically 1.77" (45mm) of accumulated precipitation.

What is the month with the warmest ocean in Fajardo?

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

What is the water temperature in September in Fajardo?

In Fajardo, Puerto Rico, in September, the average water temperature is 84.9°F (29.4°C). For swimming, diving, and other water activities, temperatures between 77°F (25°C) and 84.2°F (29°C) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

How many hours of daylight does Fajardo have in September?

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

When are sunrise and sunset in September in Fajardo?

In September, on the first day of the month, sunrise is at 6:08 am and sunset at 6:36 pm. On the last day of the month, in Fajardo, Puerto Rico, sunrise is at 6:12 am and sunset at 6:12 pm AST.

How long on average sun shines in September in Fajardo?

In September, the average sunshine duration in Fajardo, Puerto Rico, is 9.1h.

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

January, March through December, with an average maximum UV index of 7, are months with the highest UV index in Fajardo, Puerto Rico.

How high is the UV index in September in Fajardo?

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

Average temperature in September
Fajardo, PR

Average temperature in September - Fajardo, PR
  • Average high temperature in September: 84°F

The warmest month (with the highest average high temperature) is August (84.2°F).
The month with the lowest average high temperature is March (79°F).

  • Average low temperature in September: 80.8°F

The months with the highest average low temperature are September and October (80.8°F).
The coldest months (with the lowest average low temperature) are February and March (75.7°F).

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Average pressure in September
Fajardo, PR

Average pressure in September - Fajardo, 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
Fajardo, PR

Average wind speed in September - Fajardo, PR
  • Average wind speed in September: 9.3mph

The windiest month (with the highest average wind speed) is July (12mph).
The calmest month (with the lowest average wind speed) is October (8.6mph).

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Average humidity in September
Fajardo, PR

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

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

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Average rainfall in September
Fajardo, PR

Average rainfall in September - Fajardo, PR
  • Average rainfall in September: 1.77"

The wettest month (with the highest rainfall) is August (2.83").
The driest month (with the least rainfall) is February (1.06").

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Average rainfall days in September
Fajardo, PR

Average rainfall days in September - Fajardo, PR
  • Average rainfall days in September: 19.6 days

The month with the highest number of rainy days is August (21.3 days).
The month with the least rainy days is February (13.8 days).

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Average sea temperature in September
Fajardo, PR

Average sea temperature in September - Fajardo, 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 (78.7°F).

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

Average daylight in September / Average sunshine in September - Fajardo, 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: 9.1h

The month with the most sunshine is June (Average sunshine: 10.6h).
The month with the least sunshine is December (Average sunshine: 6.4h).

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Average sunshine days in September
Fajardo, PR

Average sunshine days in September - Fajardo, PR
  • Average sunshine days in September: 6.7 days

The month with the most sunshine days is March (10 days).
The month with the least sunshine days is November (4.9 days).

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Average UV index in September
Fajardo, PR

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

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

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Average cloud cover in September
Fajardo, PR

Average cloud cover in September - Fajardo, PR
  • Average cloud cover in September: 33

The months with the most cloud cover are May and July (Cloud cover 40).
The months with the least cloud cover are February, September and October (Cloud cover 33).

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Average visibility in September
Fajardo, PR

Average visibility in September - Fajardo, 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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