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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 August

San Juan edges it in August. Cancún averages 25–34°C with moderate–high crowds; San Juan 25–32°C with low–moderate crowds.

By Daan · Last reviewed October 2026

Cancún and San Juan

The verdict for August

  • WeatherVery similar6/10 vs 5.5/10
  • CrowdsSan Juan is quieterModerate–High vs Low–Moderate
  • PricesSan Juan is cheaper$$$ vs $$
  • OverallSan Juan comes out ahead5.5/10 vs 6/10
White sand and turquoise water on a sunny day in Cancún's Hotel Zone

Cancún in August

Hot, humid, stormy

Temperature
25–34°C
Crowds
Moderate–High
Prices
$$$

+Warm sea.

–Rising hurricane risk.

August is the hottest month, with the hurricane season becoming more active.

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

San Juan in August

Hot and stormy

Temperature
25–32°C
Crowds
Low–Moderate
Prices
$$

+Lower prices.

–Hurricane risk rises.

August is hot, with hurricane risk building toward its peak.

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