Historically temperatures have ranged from the 60s in the early mornings and evenings to the high 70s (°F) during the day during this time of year, though heatwaves have the potential to cause hotter than average temperatures.
Since weather patterns are increasingly unpredictable, we recommend checking temperatures online at The Weather Channel or Weather Underground a few days before the trip departs. This will be your best source for up-to-date weather information.