Climatologically speaking the last two weeks of July are the hottest of the year. The next several days will see some of the warmest days of the year. It could get as hot as it was the last few days in June when temperatures in Star Valley were into the low 90s. However the dry air mass will provide for strong night time radiational cooling, with most valley locations dipping back into the 40s prior to sunrise.
Following is the link to the excellent video weather summary provided by the Riverton Forecast Office every week.