On average, August is the wettest month in Puerto Vallarta, Mexico. The city has some very humid months, and higher-than-average humidity throughout the year. The least humid month is May, with a relative humidity of 66.9%, while the wettest month is September, with a relative humidity of 75.7%. The months with the highest relative humidity are August and September, both with 84%.
The months with the lowest relative humidity are March and April, both with 60%.In Puerto Vallarta, the wet season is hot, oppressive and cloudy, and the dry season is warm, humid and partly cloudy. Throughout the year, the temperature generally ranges from 62°F to 90°F and is rarely lower than 56°F or higher than 93°F. The average daily temperature rises to around 32°C-33°C (90°F-91°F) on some days. The last month of summer in Puerto Vallarta is August. It's another hot month with temperatures of 29.3 ºC (84.7% F) to 22.1 ºC (71.8F).
The average high temperature in Puerto Vallarta remains at 29.3 ºC (84.7 ºF), which is still moderately warm. September, the first of autumn, is moderately warm in Puerto Vallarta. Temperatures range from 21.8 ºC (71.2 ºF) to 28.5 ºC (83.3 ºF). The average high temperature in September is the same as in August, at 28.5 ºC (83.3 ºF).The months with the warmest seawater in Puerto Vallarta are August and September, both with an average temperature of 30.3 ºC (86.5 ºF).
The months with the lowest sun levels are August and September, both with an average of 8.4 hours of sunshine per day. The wettest months are August and September, both with an average relative humidity of 84%. If you're looking for dry weather, the months with the lowest probability of significant rainfall in Puerto Vallarta are January, February and then March. Puerto Vallarta's lower ocean temperature attracts humpback whales, their newborns and whale sharks, but the water is still very suitable for swimming and surfing. Between April and June rain is scarce but don't let that stop you from visiting during Puerto Vallarta's rainy season as it doesn't rain all day every day. The temperature in February is fairly stable; warm during the day and cool at night; the average high is about 27°C and the minimum around 16°C. March is the third coldest month of the year in Puerto Vallarta but with an average high temperature of 85°F it makes for excellent beach weather. The month of the year in Puerto Vallarta with the coldest water is March, with an average temperature of 75°F.
For the purposes of this report, Puerto Vallarta's geographical coordinates are 20.617 degrees latitude, -105,230 degrees longitude and 69 feet elevation. The month with the most rainy days in Puerto Vallarta alone is August, with an average of 24.6 days. Over the course of a year, the average temperature in Puerto Vallarta rarely drops below 56°F or rises above 93°F. On October 25th 2002 a Category 5 hurricane dropped its raging storm surge over Puerto Vallarta.