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SAN FRANCISCO - AUGUST 25: A golden retriever named Hercules sits next to a sprinkler during a break from playing fetch August 25, 2003 at Golden Gate Park in San Francisco, California. San Francisco broke a 72-year record Sunday when the temperature hit 89 degrees. Hercules enjoyed the 86-degree high today, but clouds from the south were expected to cool things off late in the day. By Wednesday, normal conditions were forecast to return, with highs in the low to mid-70s. (Photo by Justin Sullivan/Getty Images)

SAN FRANCISCO - AUGUST 25:  A golden retriever named Hercules sits next to a sprinkler during a break from playing fetch August 25, 2003 at Golden Gate Park in San Francisco, California. San Francisco broke a 72-year record Sunday when the temperature hit 89 degrees. Hercules enjoyed the 86-degree high today, but clouds from the south were expected to cool things off late in the day. By Wednesday, normal conditions were forecast to return, with highs in the low to mid-70s.  (Photo by Justin Sullivan/Getty Images)