San Juan, PORTO RICO and its best beaches
Climate - Temperatures and rainfall - Cyclones - Atlantic Ocean
San Juan: Temperatures during the day, at night, rain and bathing conditions
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January Day temperature  81°F / 27°C |
Night temp.  70°F / 21°C |
Bathing temperature  79°F / 26°C |
Rain  109 mm |
Conditions  
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February Day temperature 81°F / 27°C |
Night temp. 70°F / 21°C |
Bathing temperature 79°F / 26°C |
Rain 069 mm |
Conditions 
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March Day temperature 81°F / 27°C |
Night temp. 70°F / 21°C |
Bathing temperature 79°F / 26°C |
Rain 074 mm |
Conditions
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April Day temperature 83°F / 28°C |
Night temp. 72°F / 22°C |
Bathing temperature 81°F / 27°C |
Rain 104 mm |
Conditions
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May Day temperature 85°F / 29°C |
Night temp. 74°F / 23°C |
Bathing temperature 83°F / 28°C |
Rain 150 mm |
Conditions
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June Day temperature 85°F / 29°C |
Night temp. 76°F / 24°C |
Bathing temperature 83°F / 28°C |
Rain 137 mm |
Conditions 
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July Day temperature 85°F / 29°C |
Night temp. 76°F / 24°C |
Bathing temperature 83°F / 28°C |
Rain 145 mm |
Conditions
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August Day temperature 85°F / 29°C |
Night temp. 76°F / 24°C |
Bathing temperature 83°F / 28°C |
Rain 160 mm |
Conditions
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September Day temperature 86°F / 30°C |
Night temp. 76°F / 24°C |
Bathing temperature 85°F / 29°C |
Rain 157 mm |
Conditions
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October Day temperature 85°F / 29°C |
Night temp. 76°F / 24°C |
Bathing temperature 85°F / 29°C |
Rain 142 mm |
Conditions
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November Day temperature 85°F / 29°C |
Night temp. 74°F / 23°C |
Bathing temperature 83°F / 28°C |
Rain 160 mm |
Conditions
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December Day temperature 81°F / 27°C |
Night temp. 72°F / 22°C |
Bathing temperature 81°F / 27°C |
Rain 137 mm |
Conditions
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Porto Rico : climate and when to go to San juan
Tropical climate with marine influences, mild, low seasonal variations in temperature, oscillating between 77°F and 88°F on the coasts. Winter is the driest period, the summer the rainiest period. The north coast is twice as watered as the south coast. Cyclones occur between June and early December, especially between August and October. It is an average of 4 per year on the island!
| January Acceptable |
February Fine |
March Fine |
April Acceptable |
May Risky |
June Acceptable |
July Risky |
August Risky |
September Risky |
October Risky |
November Risky |
December Acceptable |
When to go? The hottest month for the beach, lazing around and swimming is September. Warning, September is a month with cyclonic risks, heavy showers may occur, otherwise other periods are possible. The coolest month is January, if you can not stand the heat too much. The driest month of the year is February, if you do not like the rain at all.
Click on
San Juan to display its climate.
Graphs and temperature curves with average precipitation over the year
Precipitation, rainfall, cyclone: PORTO RICO
Temperatures of bathing water around San Juan
Landmarks
Perfect conditions to enjoy the beach. Favorable conditions for enjoying the beach. Cloudy with sunny spells and thunderstorms.
Very strong tropical or monsoon rains. Months at risk of cyclones with alerts level 1 to 5. Nice swimming at more than 26°C / 79°F.
Everything is perfect for traveling.Cyclonic risks (6 month(s))
Cyclone mapping
Atlantic Ocean
Climate September 2025
San Juan sunshine in summer and winter
The sun at its zenith, that means well perpendicular to the surface of the Earth, sending 100% of radiation and heat. San Juan receives in winter (january), 74% of sun power and 99% during summer time (july).
The average temperature and sunshine deviations between summer and winter are 25%. This small gap means that the temperature at sea does not really vary and that the sea remains warm enough in summer and winter. The air is also hot all year round without great thermal amplitude.
Average temperatures and rainfall for a stay in September
On the left, the averages observed every month of September on the Porto Rico beaches. The trends for next month are, slightly lower average daytime temperatures, a bathing water in Atlantic Ocean remaining at a stable temperature, less rainfall (cyclonic risks) with nights as temperate as this month.
Sunset and sunrise times for PORTO RICO
Local time : September 2025, Thursday 18, 04:15 AM
Sunrise time : 06:15 am, point A
Sunset time : 6:21 pm, point B
Duration of daylight : 12:06 / 24:00
Jet lag : GMT-4
The average monthly UV index of PORTO RICO
What is the period of mosquitoes virulence over the year?
Weather forecast for San Juan
Here are the current 5-day forecasts for Miramar / San Juan. Temperatures are spaced 3 hours apart for each day. The summary of the state of the sky gives the trend of the week. The sea temperature at is a monthly average. In lagoons or seashores where the bathing water is shallow, you can add some degrees.
Friday
September 19, 2025
8 am
77.6°F
26°C
Light rain
Humidity 86%
Sea 85°F/29°C
Friday
September 19, 2025
11 am
77.1°F
26°C
Broken clouds
Humidity 88%
Sea 85°F/29°C
Friday
September 19, 2025
2 pm
80.5°F
27°C
Light rain
Humidity 81%
Sea 85°F/29°C
Friday
September 19, 2025
5 pm
87.4°F
31°C
Light rain
Humidity 60%
Sea 85°F/29°C
Friday
September 19, 2025
8 pm
87.6°F
31°C
Light rain
Humidity 61%
Sea 85°F/29°C
Friday
September 19, 2025
11 pm
84.6°F
30°C
Moderate rain
Humidity 70%
Sea 85°F/29°C
Saturday
September 20, 2025
8 am
77.6°F
26°C
Light rain
Humidity 89%
Sea 85°F/29°C
Saturday
September 20, 2025
11 am
77.4°F
26°C
Clear sky
Humidity 88%
Sea 85°F/29°C
Saturday
September 20, 2025
2 pm
80.3°F
27°C
Clear sky
Humidity 82%
Sea 85°F/29°C
Saturday
September 20, 2025
5 pm
88.1°F
32°C
Few clouds
Humidity 61%
Sea 85°F/29°C
Saturday
September 20, 2025
8 pm
88.1°F
32°C
Light rain
Humidity 65%
Sea 85°F/29°C
Saturday
September 20, 2025
11 pm
83.8°F
29°C
Moderate rain
Humidity 73%
Sea 85°F/29°C
Sunday
September 21, 2025
8 am
78.1°F
26°C
Light rain
Humidity 87%
Sea 85°F/29°C
Sunday
September 21, 2025
11 am
77.5°F
26°C
Scattered clouds
Humidity 88%
Sea 85°F/29°C
Sunday
September 21, 2025
2 pm
80.4°F
27°C
Few clouds
Humidity 83%
Sea 85°F/29°C
Sunday
September 21, 2025
5 pm
88°F
32°C
Broken clouds
Humidity 61%
Sea 85°F/29°C
Sunday
September 21, 2025
8 pm
88.5°F
32°C
Light rain
Humidity 64%
Sea 85°F/29°C
Sunday
September 21, 2025
11 pm
84.8°F
30°C
Moderate rain
Humidity 74%
Sea 85°F/29°C
Monday
September 22, 2025
8 am
78°F
26°C
Overcast clouds
Humidity 87%
Sea 85°F/29°C
Monday
September 22, 2025
11 am
77.2°F
26°C
Broken clouds
Humidity 89%
Sea 85°F/29°C
Monday
September 22, 2025
2 pm
80.4°F
27°C
Broken clouds
Humidity 83%
Sea 85°F/29°C
Monday
September 22, 2025
5 pm
87.4°F
31°C
Scattered clouds
Humidity 65%
Sea 85°F/29°C
Monday
September 22, 2025
8 pm
87.7°F
31°C
Light rain
Humidity 63%
Sea 85°F/29°C
Monday
September 22, 2025
11 pm
85.9°F
30°C
Light rain
Humidity 66%
Sea 85°F/29°C
Tuesday
September 23, 2025
8 am
79.4°F
27°C
Scattered clouds
Humidity 85%
Sea 85°F/29°C
Weather uncertainties 2025 to go to San Juan ?
When traveling in the tropics as a seaside, rain is not welcome. If you see this indicator, with possible storms, that does not mean that it will rain all day long. When we observe the local rainfall, it is either really zero or very weak. Meteorologists prefer to be pessimistic. So observe below, the skies photographed during a week announced stormy in Asia. It did not rain once. I invite you to integrate this parameter before going to San Juan for a good trip to the sun!
