The FIFA president says the heat in the country would be unbearable and believes that holding the competition in winter would only disrupt one European season
The Middle Eastern nation was controversially awarded the tournament back in 2010, despite fears over the country's soaring temperatures.
And the Swiss official has insisted that the competition cannot be held during June and July.
"The World Cup in Qatar can only take place in the winter. And the executive committee is sure to follow me," he told Sky Sport Germany.
"In this heat, you cannot play in the summer. And we have to consider the players. I was just in the Middle East, in Jordan, Palestine and Israel.
"I have felt the heat in these countries and it's not as hot there as it is in Qatar. It's possible to air condition a stadium, but not an entire country.
"That's why we need to be brave in the Executive Committee to create awareness among the leagues that we need to change something."
Many people have voiced fears over the effect a winter World Cup could have on domestic football's scheduling, but Blatter insists that the change would only be temporary.
"Yes, but it's only a year, then they can go back to normal rhythm again," he added.