"There is still enough time," Blatter said. "I will bring this up to the executive committee."
Air-conditioned stadiums to beat the heat were a defining theme of Qatar's bid, but the cooling technology only resolves the problem in venues for players, fans and officials.
"We have to protect our partners, our commercial partners, our TV partners. We have to be tough on this," said Blatter, who spoke during a two-day conference on sports, media and economy set up by German great Franz Beckenbauer in Austria.
The head of the local organizing committee, Hassan Al-Thawadi, said Qatar bid for a tournament in the summer but left the option open of a possible switch to another time of the year.
"It there is a wish from the football community to move the World Cup to the winter, we are open for it," said Al-Thawadi, who spoke to the conference through a live video connection.