Yearly & Monthly weather - Rio San Juan, Dominican Republic

The climate of Rio San Juan

Occupying a geographical position in the Caribbean and falling under the Af group of the Köppen climate classification, Rio San Juan experiences Tropical rainforest climate predominantly. Equatorial conditions in this region ensure high temperatures throughout the year with little fluctuations.

Over the course of the year, the monthly average temperatures hover between a comfortable 19°C (66.2°F) and a slightly high of 32°C (89.6°F). The coldest month has minimum temperatures reaching 19°C (66.2°F), while in the warmest month, temperatures can rise up to 32°C (89.6°F).

Rainfall occurs throughout the year, with monthly totals ranging from 103mm (4.06") in the driest month to a significant 268mm (10.55") in the rainiest. A similar pattern is seen in the number of rainfall days, varying between 10 days and 16 days each month.

A conspicuous feature of Rio San Juan's climate is its consistent daylight hours, with a minimal variation between 11.1 hours and 13.3 hours generally. Sunshine hours display rather standard values, mostly 7 hours throughout the year, while the UV Index reaches its highest of 12 during the months of April to August.

The best time to visit Rio San Juan

For visitors who prefer warm weather and less rainfall, the months from December to March fall into the suitable category. While temperatures stay moderately warm from 19°C (66.2°F) to 28°C (82.4°F), rainfall stays lowest during this period, ranging from 103mm (4.06") to 152mm (5.98").

The worst time to visit Rio San Juan

Rain intensifies markedly from April to November, making it a less appealing time for tourists. The heavy downpourings result in 204mm (8.03") to 268mm (10.55") of rainfall each month, which could disrupt outdoor activities.

Spring weather in Rio San Juan

In Rio San Juan, spring months - March to May - reveal an increasing trend in temperatures, rainfall, and sea temperature. From 19°C (66.2°F) to 21°C (69.8°F), the lowest temperature increases gradually while high temperatures edge up from 28°C (82.4°F) to 31°C (87.8°F) during this season. Rainfall follows a similar trend, leaping from 109mm (4.29") in March to 204mm (8.03") in May, making it a considerably moist period.

Summer weather in Rio San Juan

Summer months - June, July, and August - mark peak temperatures in Rio San Juan. High temperatures fluctuate around a constant 32°C (89.6°F), while the lows are comfortably resting at 22°C (71.6°F). Undeniably, it is a warm period, emphasized by 13.3 hours of daylight at its peak in June. However, rain remains a significant feature during this period, with monthly totals of 108mm (4.25") to 162mm (6.38") and sea temperatures reaching a warm 28.4°C (83.1°F) to 29°C (84.2°F).

Autumn weather in Rio San Juan

September, October, and November constitute Autumn in Rio San Juan. Despite high temperatures remaining around a consistent 32°C (89.6°F), the lowest temperature begins to drop slightly reaching 21°C (69.8°F) in November. Rainfall makes a significant increase during this period from 131mm (5.16") in September to a peak 268mm (10.55") in November. Simultaneously, sunshine hours decrease to 6 hours per day by November.

Winter weather in Rio San Juan

Compared to other seasons, winter in Rio San Juan shines a different light on its climate. Spanning December, January, and February, this period sees a cooler shift in temperatures with lows ranging from 19°C (66.2°F) to 20°C (68°F) and highs between 28°C (82.4°F) and 29°C (84.2°F). Rainfall decreases notably this period from 225mm (8.86") in December to 103mm (4.06") in February, making it a drier time of the year. On the contrary, sunshine hours and daylight hours remain fairly stable.

Weather in January

An increasing trend towards sunny conditions marks the start of the year in the coastal city of Rio San Juan. An average month brings significant rainfall with up to 135mm (5.31"), a fact not unfamiliar to long-term dwellers. This, however, does not deter the gentle sunlight that persists within the city. Weather in January »

Weather in February

February presents a shift in Rio San Juan's climate as it transitions to slightly drier and sunnier days. Despite the rainfall decreasing to 103mm (4.06"), the city continues to experience relatively damp conditions. Not new to this, the city drains off the water and recuperates quickly, ensuring minimal disruptions to daily life and routine. Weather in February »

Weather in March

March invites more sunlight into Rio San Juan, and the city starts to bask in longer daylight hours. There is a slight increment in rainfall reaching 109mm (4.29"), and pacific sea currents contribute to the overall moisture content. Weather in March »

Weather in April

Rio San Juan steps into April, welcoming an intensification in its signature tropical weather nature. Rainfall is significant, reaching up to 152mm (5.98"), suggesting more frequent showers scattered throughout the month. Consequently, the environment begins to resonate with the vibrant echoes of a tropical rainforest, a spectacle that fosters the city's lush green scenery. Weather in April »

Weather in May

May in Rio San Juan is characterized by further warming, with an underlying dampness due to persistent rainfall. And yes, May brings the highest rainfall of the year, an impressive 204mm (8.03"). Embodying a truly tropical nature, this doesn't hinder the city's vivacious activities. Weather in May »

Weather in June

The advent of June brings a significant shift towards drier days, despite being in the middle of the year. Although June taxies the highest sea temperature, the weather remains pleasantly warm. Due to its coastal nature, the city embraces the sea breezes, which temper the high temperatures, striking a perfect balance. Weather in June »

Weather in July

While July might seem to promise the relentless heat of the summer peak, Rio San Juan tells a different story. This month experiences a slight increase in the rainfall, with totals reaching 132mm (5.2"). The occasional showers continue to sustain the city's lush greenery, providing a cooling effect amidst the warm weather. Weather in July »

Weather in August

August in Rio San Juan continues the weather trend set in July, combining warmth with rain-soaked days. The increased rainfall, totaling 162mm (6.38"), sets up an ambient environment, comparable to an outdoor natural spa. These short spells of rainfall intersperse days of bright sun and create a multihued sky, a sought-after spectacle. Weather in August »

Weather in September

September complements August's framework, as the rainfall slightly decreases, measuring at 131mm (5.16"). As a result, the city undergoes subtle atmospheric shifts, preparing for the upcoming transition into the cooler part of the year. Weather in September »

Weather in October

October in Rio San Juan is a unique blend of weather patterns, presenting relatively warmer yet wetter days. The month reports an increased rainfall of 166mm (6.54"), keeping the city's landscape well-nourished and verdant. Despite the damp conditions, the city flourishes, radiating the charm of a tropical paradise. Weather in October »

Weather in November

November ushers in Rio San Juan with an upscale in rainfall, leading to a rather damp ambiance across the city. Registering a high rainfall of 268mm (10.55"), this doesn't imply a gloomy scenario. On the contrary, it nurtures the city's greenery, proffers a soothing sound of rain hitting the roofs, and refreshing the air. Weather in November »

Weather in December

Closing the year, December in Rio San Juan bids farewell to the damp and warmly welcomes the cool sea breeze. Even with reduced sunshine hours, the weather stays warm due to the temperate sea current. December experiences high rainfall, measuring at 225mm (8.86"), marking the end of the wet season. Weather in December »

Updated: Jan 27, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the coldest month in Rio San Juan?

January, February and December, with an average high-temperature of 28°C (82.4°F), are marked as the coldest months.

How much does it rain in Rio San Juan?

Throughout the year, there are 162 rainfall days, and 1895mm (74.61") of precipitation is accumulated.

What is the driest month in Rio San Juan?

The month with the least rainfall in Rio San Juan, Dominican Republic, is February, when the rain falls for 11 days and typically collects 103mm (4.06") of precipitation.

When is the sea coldest in Rio San Juan?

February is the month with the coldest seawater, with an average sea temperature of 25.7°C (78.3°F).

What are the months with the highest UV index in Rio San Juan?

The months with the highest UV index are March through August, with an average maximum UV index of 12.

What time of the year is the hottest in Rio San Juan?

During June through September, Rio San Juan experiences its average highest temperatures, peaking at 32°C (89.6°F).

When are the longest days in Rio San Juan?

June has the longest days of the year, with an average of 13h and 18min of daylight.

What are the months with the most sunshine in Rio San Juan?

June through August, with an average of 8h of sunshine, are months with the most sunshine in Rio San Juan.

When is the sea warmest in Rio San Juan?

With an average sea temperature of 29.2°C (84.6°F), September is the month with the warmest seawater in Rio San Juan, Dominican Republic.

What is the rainiest month in Rio San Juan?

The month with the most rainfall is November, when the rain falls for 14 days and typically aggregates up to 268mm (10.55") of precipitation.

What are the months with the least sunshine in Rio San Juan?

November and December, with an average of 6h of sunshine, are months with the least sunshine.

What is the month with the shortest days in Rio San Juan?

With an average of 11h and 0min of daylight, December has the shortest days of the year in Rio San Juan, Dominican Republic.

Is there Daylight Saving Time (DST) in Rio San Juan?

Rio San Juan, Dominican Republic, does not utilize Daylight Saving Time (DST). AST timezone is used over the entire year.

When is the lowest UV index in Rio San Juan?

The month with the lowest UV index in Rio San Juan, Dominican Republic, is December, with an average maximum UV index of 7.

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Year J F M A M J J A S O N D

Average temperature
Rio San Juan, Dominican Republic

Average high temperature in January:
28°C
Average high temperature in February:
28°C
Average high temperature in March:
29°C
Average high temperature in April:
30°C
Average high temperature in May:
31°C
Average high temperature in June:
32°C

Average high temperature in July:
32°C
Average high temperature in August:
32°C
Average high temperature in September:
32°C
Average high temperature in October:
31°C
Average high temperature in November:
29°C
Average high temperature in December:
28°C

The warmest months (with the highest average high temperature) are June, July, August and September (32°C).
The months with the lowest average high temperature are January, February and December (28°C).

Average low temperature in January:
19°C
Average low temperature in February:
19°C
Average low temperature in March:
19°C
Average low temperature in April:
20°C
Average low temperature in May:
21°C
Average low temperature in June:
22°C

Average low temperature in July:
22°C
Average low temperature in August:
22°C
Average low temperature in September:
22°C
Average low temperature in October:
21°C
Average low temperature in November:
20°C
Average low temperature in December:
20°C

The months with the highest average low temperature are June, July, August and September (22°C).
The coldest months (with the lowest average low temperature) are January, February and March (19°C).

Average rainfall
Rio San Juan, Dominican Republic

The wettest month (with the highest rainfall) is November (268mm).
The driest month (with the least rainfall) is February (103mm).

Average rainfall days
Rio San Juan, Dominican Republic

Average rainfall days in January:
14 days
Average rainfall days in February:
11 days
Average rainfall days in March:
11 days
Average rainfall days in April:
10 days
Average rainfall days in May:
13 days
Average rainfall days in June:
13 days

Average rainfall days in July:
15 days
Average rainfall days in August:
16 days
Average rainfall days in September:
15 days
Average rainfall days in October:
16 days
Average rainfall days in November:
14 days
Average rainfall days in December:
14 days

The months with the highest number of rainy days are August and October (16 days).
The month with the least rainy days is April (10 days).

Average sea temperature
Rio San Juan, Dominican Republic

Average sea temperature in January:
26.2°C
Average sea temperature in February:
25.7°C
Average sea temperature in March:
25.8°C
Average sea temperature in April:
26.3°C
Average sea temperature in May:
26.9°C
Average sea temperature in June:
27.9°C

Average sea temperature in July:
28.4°C
Average sea temperature in August:
29°C
Average sea temperature in September:
29.2°C
Average sea temperature in October:
28.9°C
Average sea temperature in November:
28.6°C
Average sea temperature in December:
27.3°C

The best month for swimming (with the highest average sea temperature) is September (29.2°C).
The coldest month (with the lowest average sea temperature) is February (25.7°C).

Average daylight / Average sunshine
Rio San Juan, Dominican Republic

Average daylight in January:
11h and 1min
Average daylight in February:
11h and 3min
Average daylight in March:
12h and 0min
Average daylight in April:
12h and 4min
Average daylight in May:
13h and 1min
Average daylight in June:
13h and 2min

Average daylight in July:
13h and 1min
Average daylight in August:
12h and 5min
Average daylight in September:
12h and 1min
Average daylight in October:
11h and 4min
Average daylight in November:
11h and 1min
Average daylight in December:
11h and 0min

The month with the longest days is June (Average daylight: 13h and 18min).
The month with the shortest days is December (Average daylight: 11h and 0min).

The months with the most sunshine are June, July and August (Average sunshine: 8h).
The months with the least sunshine are November and December (Average sunshine: 6h).

Average UV index
Rio San Juan, Dominican Republic

The months with the highest UV index are March, April, May, June, July and August (UV index 12).
The month with the lowest UV index is December (UV index 7).

Climate and monthly weather forecastRio San Juan, Dominican Republic

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