In addition to the hot temperatures, the team's bats are also sizzling. During Friday, Saturday and Sunday's games against the Nationals, the Giants batted around in an inning.
That sort of hitting led San Francisco to victories in all three games and helped build offensive momentum.
"Everybody seems to be hitting real well," said leadoff hitter Fred Lewis, who went 3-for-4 with a walk in Sunday's game.
Giants manager Bruce Bochy said the success of players like Lewis was translating into more hits elsewhere in the lineup as well.
"I do think guys feed off each other," he said. "Hitting is contagious."
Helping out Lewis at the top of the lineup is switch-hitter Randy Winn, who entered Monday hitting .300 with 10 stolen bases.
"I think he's one of the most underrated players in the game," Bochy said of Winn. "He plays both sides of the ball well. He runs the bases well -- he's got the full game. He isn't talked about much, but we know how valuable he is to this club."
Being on the road hasn't dampened the Giants' offensive abilities. They entered Monday having won six in a row on the road, hoping to complete a four-game sweep on Monday.
Aaron Rowand was hitting .404 on the road, and Bengie Molina was right behind him with a .387 average away from home, first and second in the Major Leagues.
That's a trend that has continued, even in the hot Washington sun -- the temperature at game time on Monday night was 92 degrees, and it was even hotter on the field as the team took batting practice. Lewis said the heat doesn't bother him.
"Baseball is baseball," Lewis said. "It doesn't really matter to me."
Bochy said he has a simple strategy for dealing with batters when they're on a roll.
"I stay out of the way," Bochy said with a laugh. "I like to keep it consistent as much as I can, while still giving guys days off."
Michael Phillips is a contributor to MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.