With record-breaking temperatures expected tomorrow for Greater Boston, Boston Marathon officials are urging some runners to skip this year's race.

"We are now making the recommendation that if you are not highly fit or if you have any underlying medical conditions (for example - cardiac disease, pulmonary disease or any of a number of medical problems), you should NOT run this race," the Marathon's medical directors said in an advisory.

Temperatures in Boston are expected to hit about 87 degrees. The record for April 16 is 84, which was set in 2003, according to the National Weather Service. More recently, temperatures in Boston hit 86 degrees during the 2004 marathon that was held on April 19.

It's a far cry from the usual Marathon Monday temperatures, which have been in the 40s and 50s over the last several years.


Runners who are considered official entrants can skip this year's race and be deferred to the 2013 marathon, according to the Boston Athletic Association's deferment policy.

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