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White sand and turquoise water on a sunny day in Cancún's Hotel ZoneAerial view of Castillo San Felipe del Morro on the tip of Old San Juan, Puerto Rico

Cancún vs San Juan in January

San Juan edges it in January. Cancún averages 19–29°C with high crowds; San Juan 22–28°C with high crowds.

By Daan · Last reviewed October 2026

Cancún and San Juan

The verdict for January

  • WeatherVery similar8.5/10 vs 8/10
  • CrowdsVery similarHigh vs High
  • PricesVery similar$$$$ vs $$$$
  • OverallSan Juan comes out ahead6/10 vs 6.5/10
White sand and turquoise water on a sunny day in Cancún's Hotel Zone

Cancún in January

Dry, sunny and busy

Temperature
19–29°C
Crowds
High
Prices
$$$$

+Reliable dry, sunny weather.

–High-season prices.

January is dry and sunny, which is why it is high season. The first week stays expensive after the holidays.

Aerial view of Castillo San Felipe del Morro on the tip of Old San Juan, Puerto Rico

San Juan in January

Festival season

Temperature
22–28°C
Crowds
High
Prices
$$$$

+The San Sebastián Street Festival.

–High season prices.

January is high season, and the third weekend brings the San Sebastián Street Festival to Old San Juan.

Scores and crowd levels are my own judgement; temperatures are monthly averages. Higher scores are better: quieter, cheaper and more pleasant.