Winter months are quite dry, while June through early October can be quite rainy.
Summer rains, however, are typically late afternoon or nighttime showers.
Acapulco has at least some sunshine 360 days a year. The riskiest month to visit Acapulco in terms of the weather is September. As with many tropical destinations, humidity can be quite high, especially during the summer months. However, most hotel rooms, restaurants, and shops are air-conditioned.