San Juan Weather in January

January in San Juan averages 33°C (91°F) during the day and 19°C (66°F) at night. Around 37 mm (1.5 in) of rainfall is typical for this time of year.

Rainfall in San Juan in January

Historically, January sees about 5 days of rain, with a monthly average of 37 mm (1.5 in). The rain this month typically falls in concentrated bursts rather than all-day showers. Expect a few heavier spells rather than constant grey skies.

Temperature in San Juan in January

In January, expect very high temperatures in San Juan, with highs of 33°C (91°F) and lows of 19°C (66°F) at night. For most visitors, the main thing to prepare for is the heat during the day. Nights drop to around 19°C (66°F), which is noticeably cooler than the daytime. A light jacket for the evening is a sensible addition, and the cool nights tend to make sleeping comfortable. While these temperatures are averages, expect some days to be hotter. Choose light, airy clothing to handle the warmth effectively.

Sunshine in San Juan in January

Enjoy a sunny month with about 338 hours of sunshine, the clear skies make San Juan even more beautiful.

Our weather planner can help you find worldwide destinations with pleasant weather during this period. March, April, May, June, July, August, September and October typically offer the best weather for San Juan.