You are definitely thinking the right way, morning dew would have an affect because of the moisture. But since it only needs 6 hours of cure time, you can still apply in the cooler evening time around 6, 7 or 8ish. This will still give you plenty of curing time.
Liquid Wax is flexible to use in many temperature ranges. You can use this product both indoors or outdoors. Just don't use it outside in the sun if the surface is super hot. If you are using outdoors in the sun, the surface temperature should be at maximum, warm to the touch (you should be able to comfortably hold your hands against your paint).
The optimal place to use it would be inside your garage, in the shade, on a cool surface. But if that isn't an option, an easy way to determine if it's okay to use is to make sure you can comfortably hold your hand on your paint.
The ideal working temperature is around 60°F - 85°F. If working in any temperatures above, simply shorten the 30 minute drying time as the product will dry faster. If applied thin as recommended, our product is super easy to remove regardless of the temperatures.