Variable -- February-April: High temperatures range from mid-70sF (23C) to low-90sF (32C) with lows from the mid-30sF (2C) to mid-50sF (12C). Cold fronts can bring freezing weather with rain or snow. -- May-August: Temperatures are hot and the weather can be stormy. Temperatures over 100F (more than 38C) degrees. -- September-January:Temperatures are cooler. The weather can turn cold any time during these months.
Rio Grande Wild & Scenic River Entrance Fee - $0.00
The Rio Grande Wild & Scenic River does not have an entry fee however, if you float the portions of the Wild & Scenic River inside Big Bend National Park, you will be charged for entry into the National Park.