Climate and monthly weather forecastArroyo, PR

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).

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 »