That's the tailend of the region's rainy season (and what a rainy season it was, with fatal mudslides at the end of January), which hopefully spells clearer skies, sunnier days, and... drumroll... fewer crowds before the tourist rush really sets in. Here's a link to some gear and advice for trekking in the region from an Away.com editor who was there last July: http://bit.ly/9ekC8u