Report Guess Start of Rainy Season in Ajijic/Chapala/Guadalajara Posted June 19 On 6/5/2021 at 9:13 PM, Mainecoons said: Sorry but that is not correct. If it were the tropical storms wouldn't move from east to west/northwest. Our rainy season comes from the SE, driven by the Azores High. The Monsoon Trough flows from east to west, see below, and as the rain picks up tropical waves track along it from southeast to northwest and it shifts more to the north bringing the rain inland. That pattern is beginning now as can be seen from this screenshot from the Mexico 3 Day. Towards the end of the rainy season, usually in September, the tropical storms start tracking more to the north and northwest, some curving around to hit the coast as far north as Cabo. No, the rainy season has not started. We are in a drying trend now as the residual moisture from two tropical depressions dissipates. But it is coming soon as the screen shot illustrates. And there was also this bit of nonsense that denied the validity of tropical (monsoonal) moisture coming from the south. So the storm that's expected here tonight doesn't count either.