High humidity (79%) combined with the heat means it will feel more uncomfortable than the air temperature alone suggests — stay hydrated if you're active outside.

Nearby Regional Outlook

San Juan Weather Radar

Live precipitation · Cloud cover · Wind

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Frequently Asked Questions

What is the hottest month in San Juan?

The hottest month in San Juan is typically June, with daytime highs averaging around 31.3°C (88°F), based on 10 years of historical weather data. Overnight lows during this period average near 24.8°C (77°F).

What is the coldest month in San Juan?

The coldest month in San Juan is typically January, with overnight lows averaging around 22.1°C (72°F) and daytime highs near 28°C (82°F), based on 10 years of historical weather data.

Does San Juan have a rainy season?

San Juan doesn't have a sharply defined rainy season rainfall is fairly spread across the year based on 10 years of historical data. September is the wettest month on average (about 160 mm), while January is the driest (about 57 mm).

What's the best time of year to visit San Juan?

The best time to visit San Juan is typically December to March, when daytime highs average a comfortable 28.2°C (83°F). Rainfall during this window averages around 62 mm, one of the lighter, more comfortable stretches of the year. This is based on 10 years of historical weather data.

Atmospheric Details

Wind

21 km/h

E · Moderate Breeze · Max 28 km/h

Humidity

79 %

High · feels muggy

UV Index

Very High

Visibility

16 km

Excellent

Pressure

1015 hPa

Stable

Dew Point

25°C

Very humid

Today vs Normal

30°C0° below normal

The long-term average high for today is 30°C.

28 of the last 28 days with published data ran above normal.

That's a break from the pattern - today's forecast runs below normal even though the recent stretch mostly ran above.

Red = above normal, blue = at or below · last 12 days

Air Quality

Moderate

Air quality is acceptable for most people. Unusually sensitive individuals should consider reducing prolonged or heavy outdoor exertion.

Health & Activity Advice

⚠ Limit Outdoor Time

UV index is 8 today — very high. Limit sun exposure around midday, apply SPF 30+ every two hours, and seek shade when possible.

Air quality is acceptable for most people. Unusually sensitive individuals should consider reducing prolonged or heavy outdoor exertion.

Morning before 10 AM or evening after 4 PM is the more comfortable window for outdoor activity today.

High humidity (79%) combined with the heat means it will feel more uncomfortable than the air temperature alone suggests — stay hydrated if you're active outside.