October weather forecast
Arroyo, PR

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Weather in October

October represents the transition into the cooler season in Arroyo, with temperatures starting to fall slightly from September's highs. Although rainfall remains substantial at 3.62" (92mm), the month witnesses a softer touch of the sun. The steady wind contributes to the city's climatic balance during this month. The considerably cooler evenings are an ideal time for night walks by the shore under the starlit skies. Despite the temperature drop, the sea remains warm enough for visitors and locals to enjoy water activities.

Temperature

October's advent in Arroyo denotes a minor fluctuation in the average high-temperature to a still moderately hot 84°F (28.9°C) from September's 85.1°F (29.5°C). With a barely noticeable fluctuation in temperature, Arroyo reaches an average low of 75.9°F (24.4°C) during the October nights.

Heat index

The heat index value for October is calculated to be a sweltering 95°F (35°C). More protective measures are required - heat exhaustion and heat cramps are likely. Heatstroke may follow lengthy activity.
When considering the heat index, it's pivotal to note it is for shade and mild wind conditions. 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 'apparent temperature' or 'real feel', is an indicator that blends the effects of temperature and humidity to depict perceived warmth. One's weather perception can be influenced by a range of factors including metabolic differences, being pregnant, and their level of physical activity. One should be aware that direct sunshine can amplify the perceived temperature, raising the heat index by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical 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.
The human body keeps its cool primarily through perspiration, as this process enables sweat to evaporate, taking away the excess heat. When relative humidity increases, the body's capacity to evaporate heat decreases, leading to a heightened sense of warmth. Overheating dangers loom when the body's heat release mechanisms are overshadowed by excessive gain.

Humidity

In October, the average relative humidity in Arroyo is 81%.

Rainfall

In Arroyo, in October, it is raining for 25.3 days, with typically 3.62" (92mm) of accumulated precipitation. Throughout the year, in Arroyo, there are 255.3 rainfall days, and 29.41" (747mm) of precipitation is accumulated.

Ocean temperature

In Arroyo, the average seawater temperature in October is 84.7°F (29.3°C).
Note: Temperatures between 77°F (25°C) and 84.2°F (29°C) in water are ideal for swimming, diving, and other activities, providing enjoyment and comfort for extended durations.

Daylight

In Arroyo, Puerto Rico, the average length of the day in October is 11h and 44min.
On the first day of the month, sunrise is at 6:14 am and sunset at 6:12 pm. On the last day of October, sunrise is at 6:23 am and sunset at 5:52 pm AST.

Sunshine

In October, the average sunshine is 7.9h.

UV index

The months with the highest UV index are May through October, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high health hazard from unsafe exposure to UV radiation for average individuals.
Note: In October, the UV index of 7 transforms into the following advice:
Guard oneself from overexposure. Defence against sun injury is vital. 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. Loose clothes with a tight weave are optimal for safeguarding yourself against the Sun's rays. Be wary! Reflections from sand and water make UV radiation more intense.
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Frequently asked questions

How hot does it get in Arroyo in October?

The high-temperature, in October, in Arroyo, is 84°F (28.9°C), while the low-temperature averages to 75.9°F (24.4°C). In October, the average heat index (a.k.a. 'real feel', 'felt air temperature'), which combines air temperature and relative humidity, is calculated to be 95°F (35°C).

What is the average humidity in October in Arroyo?

In October, the average relative humidity is 81%.

How many days does it rain in October in Arroyo?

In Arroyo, in October, it is raining for 25.3 days, with typically 3.62" (92mm) of accumulated precipitation.

How warm is the water in October in Arroyo?

In Arroyo, Puerto Rico, in October, the average water temperature is 84.7°F (29.3°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 Arroyo have in October?

In Arroyo, the average day length in October is 11h and 44min.

What time are sunrise and sunset in October in Arroyo?

In October, on the first day of the month, sunrise is at 6:14 am and sunset at 6:12 pm. On the last day of the month, in Arroyo, sunrise is at 6:23 am and sunset at 5:52 pm AST.

How many hours of sunshine does Arroyo have in October?

The average sunshine duration in October in Arroyo, Puerto Rico, is 7.9h.

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

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

What is the UV index intensity in October in Arroyo?

In October, the average daily maximum UV index is 7. A UV Index estimate of 6 to 7 represents a high health vulnerability from unsafe 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 October
Arroyo, PR

Average temperature in October - Arroyo, PR
  • Average high temperature in October: 84°F

The warmest month (with the highest average high temperature) is August (85.3°F).
The month with the lowest average high temperature is January (79.9°F).

  • Average low temperature in October: 75.9°F

The months with the highest average low temperature are July and August (76.6°F).
The coldest month (with the lowest average low temperature) is January (71.4°F).

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Average pressure in October
Arroyo, PR

Average pressure in October - Arroyo, PR
  • Average pressure in October: 29.9"Hg

The months with the highest atmospheric pressure are January and February (30.01"Hg).
The month with the lowest atmospheric pressure is October (29.9"Hg).

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Average wind speed in October
Arroyo, PR

Average wind speed in October - Arroyo, PR
  • Average wind speed in October: 6mph

The windiest month (with the highest average wind speed) is July (8.6mph).
The calmest month (with the lowest average wind speed) is October (6mph).

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Average humidity in October
Arroyo, PR

Average humidity in October - Arroyo, PR
  • Average humidity in October: 81%

The month with the highest relative humidity is November (82%).
The month with the lowest relative humidity is March (77%).

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Average rainfall in October
Arroyo, PR

Average rainfall in October - Arroyo, PR
  • Average rainfall in October: 3.62"

The wettest month (with the highest rainfall) is September (4.29").
The driest month (with the least rainfall) is February (1.02").

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Average rainfall days in October
Arroyo, PR

Average rainfall days in October - Arroyo, PR
  • Average rainfall days in October: 25.3 days

The months with the highest number of rainy days are May and October (25.3 days).
The month with the least rainy days is February (15.4 days).

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Average sea temperature in October
Arroyo, PR

Average sea temperature in October - Arroyo, PR
  • Average sea temperature in October: 84.8°F

The best month for swimming (with the highest average sea temperature) is September (85.4°F).
The coldest months (with the lowest average sea temperature) are February and March (79.3°F).

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Average daylight in October /
Average sunshine in October
Arroyo, PR

Average daylight in October / Average sunshine in October - Arroyo, PR
  • Average daylight in October: 11h and 4min

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 October: 7h and 5min

The month with the most sunshine is June (Average sunshine: 10h and 24min).
The month with the least sunshine is December (Average sunshine: 6h and 30min).

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Average sunshine days in October
Arroyo, PR

Average sunshine days in October - Arroyo, PR
  • Average sunshine days in October: 2.9 days

The month with the most sunshine days is January (8.8 days).
The month with the least sunshine days is May (2.7 days).

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Average UV index in October
Arroyo, PR

Average UV index in October - Arroyo, PR
  • Average UV index in October: 7

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

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Average cloud cover in October
Arroyo, PR

Average cloud cover in October - Arroyo, PR
  • Average cloud cover in October: 33

The months with the most cloud cover are May and July (Cloud cover 40).
The month with the least cloud cover is February (Cloud cover 31).

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Average visibility in October
Arroyo, PR

Average visibility in October - Arroyo, PR
  • Average visibility in October: 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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Arroyo, Puerto Rico, USA

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