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Contents
- The climate of Arroyo
- The best time to visit Arroyo
- The worst time to visit Arroyo
- Spring weather in Arroyo
- Summer weather in Arroyo
- Autumn weather in Arroyo
- Winter weather in Arroyo
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average sea temperature
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
The climate of Arroyo
Arroyo, Puerto Rico, USA, lies in the tropical region and is classified under the Köppen climate system as Aw which signifies a tropical wet and dry or savanna climate. This classification epitomizes conditions where high temperatures persist throughout the year, with considerable discrepancy in rainfall between the wet and dry periods.
A scrutiny of Arroyo's weather data reveals a pattern of high humidity which is constant from 77% to 82% each month. The year witnesses a high temperature that fluctuates mildly, peaking at 85.3°F (29.6°C) in August and dipping to 79.9°F (26.6°C) in January. A similar trend is seen in the minimum temperatures, oscillating from 71.4°F (21.9°C) to 76.6°F (24.8°C).
Rainfall patterns in Arroyo are immensely significant, with the least recorded precipitation seen in February at 1.02" (26mm), and the heaviest rainfall observed in September, measuring 4.29" (109mm). The number of rainy days corresponds with this pattern, displaying an increase from 15.4 days in February to a peak of 25.3 days in both May and October. This rainfall directly affects the relative humidity reading throughout the year.
Arroyo experiences high atmospheric pressure with minimal variation, maintaining within the narrow band of 29.90 to 30.01" (762mm). The coastal location of Arroyo also ensures that the sea temperature stays warm throughout the year. The sun's rays are strongest between May and September (UV index 7), while December to April and October to November see slightly lower UV intensity (UV index 6).
A scrutiny of Arroyo's weather data reveals a pattern of high humidity which is constant from 77% to 82% each month. The year witnesses a high temperature that fluctuates mildly, peaking at 85.3°F (29.6°C) in August and dipping to 79.9°F (26.6°C) in January. A similar trend is seen in the minimum temperatures, oscillating from 71.4°F (21.9°C) to 76.6°F (24.8°C).
Rainfall patterns in Arroyo are immensely significant, with the least recorded precipitation seen in February at 1.02" (26mm), and the heaviest rainfall observed in September, measuring 4.29" (109mm). The number of rainy days corresponds with this pattern, displaying an increase from 15.4 days in February to a peak of 25.3 days in both May and October. This rainfall directly affects the relative humidity reading throughout the year.
Arroyo experiences high atmospheric pressure with minimal variation, maintaining within the narrow band of 29.90 to 30.01" (762mm). The coastal location of Arroyo also ensures that the sea temperature stays warm throughout the year. The sun's rays are strongest between May and September (UV index 7), while December to April and October to November see slightly lower UV intensity (UV index 6).
The best time to visit Arroyo
Given the favourable tropical climate, Arroyo is suitable for a visit at any time of the year. However, considering the rainfall patterns and temperatures, the best time to visit Arroyo would arguably be between February and April. During this period, rainfall is on the lower side, with monthly averages between 1.02" (26mm) to 1.93" (49mm). Moreover, the number of rainy days is also lesser. Pleasant temperatures ranging from a high of 80.6°F (27°C) to 81.9°F (27.7°C) and lows between 71.6°F (22°C) to 73°F (22.8°C) make this period particularly attractive to visitors.
The worst time to visit Arroyo
The least favorable months to visit Arroyo would arguably be September and October, characterized by the highest rainfall, culminating at 4.29" (109mm) and 3.62" (92mm) respectively. Both these months record a higher instance of rainy days, with 23.7 days in September and 25.3 days in October. High humidity at 80% and 81% during these two particular months could also contribute to a less comfortable stay.
Spring weather in Arroyo
Spring in Arroyo, encompassing March, April, and May, sees gradually increasing temperatures. Highs from 81°F (27.2°C) to 83.1°F (28.4°C) and lows from 71.6°F (22°C) to 74.1°F (23.4°C) mark this period. As spring progresses, rainfall increases from 1.42" (36mm) in March to a significant 2.95" (75mm) in May, resulting in a corresponding increase in the number of rainy days from 19.3 to 25.3 between March and May.
Summer weather in Arroyo
The summer months of June, July, and August produce highs from 84.4°F (29.1°C) to 85.3°F (29.6°C) and lows between 75.9°F (24.4°C) and 76.6°F (24.8°C). This period records a substantial amount of rainfall, with monthly figures escalating from 1.85" (47mm) in June to the highest of the year at 3.39" (86mm) in August.
Autumn weather in Arroyo
During autumn, which includes September, October, and November, high temperatures decrease from 85.1°F (29.5°C) to 82.4°F (28°C), and lows drop from 76.3°F (24.6°C) to 74.5°F (23.6°C). This interval is characterized by the highest rainfall for the year, measuring 4.29" (109mm) in September, 3.62" (92mm) in October, and 2.99" (76mm) in November.
Winter weather in Arroyo
Winter months in Arroyo, constituted by December, January, and February, experience milder temperatures, with highs of 79.9°F (26.6°C) to 80.8°F (27.1°C) and lows ranging from 71.4°F (21.9°C) to 72.9°F (22.7°C). The winter season sees lower levels of rainfall, decreasing from 1.61" (41mm) in December to 1.02" (26mm) by February, which corresponds with a reduction in the number of rainy days from 18.9 to 15.4 in the same period.
Weather in January
With the lowest rainfall maximum of 1.22" (31mm) signaling the start of the year, January exemplifies mild weather conditions in Arroyo, Puerto Rico. It signifies a period of relative dryness accompanied by a cool ocean breeze, offering pleasant weather for outdoor activities. Weather in January »
Weather in February
February weather in Arroyo shows a slight increase in temperature but maintains the same level of moderate humidity as in January. This month is known for its warm sunny days and slightly cooler nights. Furthermore, it records a mere 1.02" (26mm) in rainfall, sustaining the pronounced dry spell. Weather in February »
Weather in March
March is characterized by a slight upward tick in both temperature and rainfall at 1.42" (36mm), as Arroyo transitions into the more humid part of the year. Most days are sunlit, but the city may witness occasional overcast skies. Weather in March »
Weather in April
April weather in Arroyo, Puerto Rico, indicates a noticeable climb in the heat index and a rise in humidity. It also brings with it an escalation in rainfall amounts to 1.93" (49mm), signaling the onset of the wet season. The month typically sees a mix of sunny and cloudy days. Weather in April »
Weather in May
May marks the commencement of the hot season in Arroyo, with temperatures, humidity, and rainfall at 2.95" (75mm) all reaching the highest levels yet experienced during the year. Despite these enhanced figures, the city remains joyfully vibrant under the sunny skyline. Weather in May »
Weather in June
June experiences a further increase in average temperatures and boasts some of the longest days of the year in Arroyo. On the other hand, rainfall recedes to 1.85" (47mm), proving some relief after the peak rainfall recorded in May. Weather in June »
Weather in July
In July the weather in Arroyo has slightly risen temperatures, peaking at 84.7°F (29.3°C) during the day. Coupled with relatively stronger winds, the city experience high evaporation rates. This period displays the distinctive character of Arroyo's summer, blending warmth with more significant cloud cover. Weather in July »
Weather in August
August continues to uphold the summer spirit in Arroyo, with warm temperatures and a high humidity index. The rainfall also reaches its annual zenith at 3.39" (86mm). Despite the climatic variations, locals and visitors can relish indulging in diverse activities. Weather in August »
Weather in September
September weather in Arroyo denotes a slight drop in air and sea temperatures. Yet it continues to register the highest rainfall volumes for the year at 4.29" (109mm), which may lead to sporadic interruptions in outdoor activities. Weather in September »
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. Weather in October »
Weather in November
November marks a significant reduction in the heat index, with temperatures and sea warmth seeing a noticeable dip. However, the tropical charm of Arroyo is far from diminishing. With rainfall reducing to 2.99" (76mm), the pace of life in the city quickens again after the wet spell. Weather in November »
Weather in December
December in Arroyo brings the year to a comfortable close, with mild temperatures and a significant reduction in rainfall to 1.61" (41mm). The cooler nights and warm sunny days mark the onset of the holiday season. Despite shorter days, the consistently moderate sea temperature ensures the continued enjoyment of aquatic activities. Weather in December »
Updated: Aug 18, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What part of the year is the coldest?
With average temperatures fluctuating between a high of 79.9°F (26.6°C) and a low of 71.4°F (21.9°C), January stands out as the coldest month.
How many days does it rain?
Throughout the year, there are 255.3 rainfall days, and 29.41" (747mm) of precipitation is accumulated.
What are the months with the lowest UV index?
January through April, November and December, with an average maximum UV index of 6, are months with the lowest UV index.
What is the driest month?
February is the month with the least rainfall. Rain falls for 15.4 days and accumulates 1.02" (26mm) of precipitation.
What months are the ocean coldest?
February and March, with an average ocean temperature of 79.3°F (26.3°C), are months with the coldest seawater.
What is the least humid month?
With an average relative humidity of 77%, March is the least humid month.
What are the months with the highest UV index?
The months with the highest UV index are May through October, with an average maximum UV index of 7.
When are the longest days?
June has the longest days of the year, with an average of 13h and 12min of daylight.
What month has the most sunshine?
The month with the most sunshine is June, with an average of 10.4h of sunshine.
What month is the hottest?
In Arroyo, August is the warmest month, with temperatures averaging a high of 85.3°F (29.6°C) and a low of 76.6°F (24.8°C).
What is the rainiest month?
September is the month with the most rainfall in Arroyo. Rain falls for 23.7 days and accumulates 4.29" (109mm) of precipitation.
What month is the ocean warmest in Arroyo?
With an average ocean temperature of 85.5°F (29.7°C), September is the month with the warmest seawater in Arroyo.
What is the most humid month in Arroyo?
With an average relative humidity of 82%, November is the most humid month in Arroyo.
What is the month with the shortest days?
With an average of 11h and 6min of daylight, December has the shortest days of the year.
Is there Daylight Saving Time (DST)?
Arroyo does not observe Daylight Saving Time (DST). AST timezone is used over the entire year.
What is the month with the least sunshine?
With an average of 6.5h of sunshine, December has the least sunshine of the year.
Average temperature
Arroyo, PR
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).
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).
Average pressure
Arroyo, PR
- Average pressure in January:
30.01"Hg - Average pressure in February:
30.01"Hg - Average pressure in March:
30"Hg - Average pressure in April:
29.98"Hg - Average pressure in May:
29.98"Hg - Average pressure in June:
30"Hg
- Average pressure in July:
30"Hg - Average pressure in August:
29.96"Hg - Average pressure in September:
29.92"Hg - Average pressure in October:
29.9"Hg - Average pressure in November:
29.91"Hg - Average pressure in December:
29.98"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).
Average wind speed
Arroyo, PR
- Average wind speed in January:
7.7mph - Average wind speed in February:
7.9mph - Average wind speed in March:
7.5mph - Average wind speed in April:
7.4mph - Average wind speed in May:
7.2mph - Average wind speed in June:
7.9mph
- Average wind speed in July:
8.6mph - Average wind speed in August:
8mph - Average wind speed in September:
6.3mph - Average wind speed in October:
6mph - Average wind speed in November:
6.1mph - Average wind speed in December:
7.4mph
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).
Average humidity
Arroyo, PR
The month with the highest relative humidity is November (82%).
The month with the lowest relative humidity is March (77%).
Average rainfall
Arroyo, PR
- Average rainfall in January:
1.22" - Average rainfall in February:
1.02" - Average rainfall in March:
1.42" - Average rainfall in April:
1.93" - Average rainfall in May:
2.95" - Average rainfall in June:
1.85"
- Average rainfall in July:
3.11" - Average rainfall in August:
3.39" - Average rainfall in September:
4.29" - Average rainfall in October:
3.62" - Average rainfall in November:
2.99" - Average rainfall in December:
1.61"
The wettest month (with the highest rainfall) is September (4.29").
The driest month (with the least rainfall) is February (1.02").
Average rainfall days
Arroyo, PR
- Average rainfall days in January:
16.8 days - Average rainfall days in February:
15.4 days - Average rainfall days in March:
19.3 days - Average rainfall days in April:
21.2 days - Average rainfall days in May:
25.3 days - Average rainfall days in June:
19.8 days
- Average rainfall days in July:
21.8 days - Average rainfall days in August:
23.3 days - Average rainfall days in September:
23.7 days - Average rainfall days in October:
25.3 days - Average rainfall days in November:
24.5 days - Average rainfall days in December:
18.9 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).
Average sea temperature
Arroyo, PR
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).
Average daylight / Average sunshine
Arroyo, PR
- Average daylight in January:
11h and 1min - Average daylight in February:
11h and 4min - Average daylight in March:
12h and 1min - Average daylight in April:
12h and 4min - Average daylight in May:
13h and 0min - Average daylight in June:
13h and 1min
- Average daylight in July:
13h and 1min - Average daylight in August:
12h and 4min - Average daylight in September:
12h and 1min - Average daylight in October:
11h and 4min - Average daylight in November:
11h and 2min - Average daylight in December:
11h 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 January:
8h and 5min - Average sunshine in February:
8h and 5min - Average sunshine in March:
8h and 4min - Average sunshine in April:
8h and 4min - Average sunshine in May:
10h and 1min - Average sunshine in June:
10h and 2min
- Average sunshine in July:
9h and 4min - Average sunshine in August:
8h and 4min - Average sunshine in September:
9h and 0min - Average sunshine in October:
7h and 5min - Average sunshine in November:
6h and 4min - Average sunshine in December:
6h and 3min
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).
Average sunshine days
Arroyo, PR
- Average sunshine days in January:
8.8 days - Average sunshine days in February:
7.1 days - Average sunshine days in March:
7.5 days - Average sunshine days in April:
5.7 days - Average sunshine days in May:
2.7 days - Average sunshine days in June:
4.8 days
- Average sunshine days in July:
4.8 days - Average sunshine days in August:
3 days - Average sunshine days in September:
4 days - Average sunshine days in October:
2.9 days - Average sunshine days in November:
3.5 days - Average sunshine days in December:
7.4 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).
Average UV index
Arroyo, PR
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).
Average cloud cover
Arroyo, PR
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).
Average visibility
Arroyo, PR
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).
Arroyo, Puerto Rico, USA
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