ESPN
It's also oppressively hot and humid.
ESPN's Jeremy Schapp was just reporting live from the pitch in Manaus and a laser thermometer measured the temperature at 105 degrees F. Granted, the U.S. will play when the sun goes down, so it might relieve the heat slightly, but it's still going to be very hot.
According to Weather.com, when the match kicks off at 6 p.m., it will feel like it's 85 degrees and there will be 85% humidity. Oof.
This might be a good thing for the U.S., however, because many of its players who are in MLS are used to playing in hot and humid climates like Houston in the middle of the summer.