San Juan UV index in January
Typical ultraviolet levels for San Juan during January, from the past year of data.
High
San Juan
High UV. Avoid the sun during peak hours and wear protective clothing, sunscreen, and a hat.
6.4
UV Index
January average
Low
Moderate
High
Very High
Extreme
January UV
6.4291
Risk level
High
Yearly peak
13.787
Peak month
August
San Juan UV index — monthly trend
Average UV index by month over the past year, with January highlighted.
Visiting San Juan in January?
In January, San Juan's typical UV index is about 6.4291 — a high risk level. High UV. Avoid the sun during peak hours and wear protective clothing, sunscreen, and a hat.
Across the year, San Juan sees the strongest UV in Summer, peaking around 13.787 in August. Plan sun protection accordingly.
