Hopefully, you start out the day fully hydrated and urinating. That is the first step to a good ride. Next, remember to drink during the first 2 hours of the ride. This will help take care of you in the latter stages of a longer ride. Not large, outrageous amounts all at once, but rather a few sips every few minutes.
Keep the water coming in at a steady rate for the duration of the ride, because it is most certainly going out. On rides of more than 2 hours, you should still be urinating about once every 2 hours. The darker the color (and the more odor), the less hydrated you are.
With higher than normal humidity, it takes longer for the perspiration to evaporate. Since your body is not cooling down rapidly, it will sweat more in an attempt to cool down. The wicking affect of your apparel is also slower, so you'll sweat even more. This is a great time to use your jersey zipper and vent that jersey a little bit. Every once in a while, open up the jersey and let a little breeze inside. After a brief cool down, zip it back up.
Apparel note:
the more exposed skin you have - the more you risk dehydration. Wear a sleeved jersey and consider getting sun sleeves.
Finally,
watch your tempo. Since this is not spring time, don't jump out of the gate like a frisky pony. Go out with a steady pace and get your legs warmed up. Be aware of how rapidly you heat up. You will become aware of the heat sooner than usual, probably before you get up to what would normally be your cruising speed. Once you notice the feel of the heat/humidity, just hold that pace as best you can for the duration of the ride. Take this approach for your next couple of long rides and you will find yourself feeling stronger and once again able to pick up the pace. Slow down now and you will be faster after a few weeks of "heat acclimation".
Bow down to the hostile heat now and you'll be stronger later.
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