The coast of Oaxaca lies well within the tropics at a latitude of about 16 . The region is generally arid along the coast with more rainfall in the nearby mountains. The rainy season runs from May to October, with September usually having the most rain.
Amounts vary from year to year and most of the rainfall occurs on a relatively few days.
A typical day in the rainy season would be a clear morning, clouding up in the afternoon, with thunder heard in the nearby mountains. In this hot climate, the afternoon clouds can be quite welcome. The rainy season is also hurricane season, and hurricanes offshore can have a strong impact on the amount of rainfall. Refer to the satellite, radar, and storm map images below. November through April is the dry season.