Alex is correct,
I have been teaching experienced divers a bit these past few days with very challenging conditions both north and south of the bay, and yesterday was time for 2 scooter fun dives with divebuddy Natalia. At Majahuitas and los Arcos the first 12 to 15 feet were 74 F, and then we had chilly 63 F water down to 100 feet.
Just a few days ago the water in Bahia de Banderas was 85 F . Suddenly these past 5 or 6 days everything changed.
0.5 mm wetsuit to drysuit in no time !!
I hope it doesn't last too long ! Water temp should not vary too much until Dec or so.
Don't be caught offguard with thermal protection as some of the students did !
Happy diving.
Thanks!
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