Wow, looks like you're getting your KLR into some nice nasty stuff!
Do be aware that August/September are "typically" the heaviest time for Rainy
Season in Southern Mexico and Cent. America. Of course, this can vary year to year.
But global warming means more severe EVERYTHING. Hotter, Colder, more rain, longer droughts ... all crazy mixed up and no one is ready.
In rainy season you do get cooling cloud cover, usually does not rain in AM ... so plan to ride from dawn to when it begins to cloud up. Once the rain comes ... take cover. (tropical storms preclude this theory, can rain 24 hours)
Can be brutally HOT with 90% humidity. By late October or November rainy season tapers off and temps can cool (but not always!) Humidity lowers too. If too HOT, go up high (if possible).
I ended up living in Guatemala because much of the best areas are around
1500 to 2000 meters. Nice and cool year round. 
(Guatemala: Land of Internal Spring)
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