Three World Cup matches are set to take place across Brazil on Friday. A combination of rain and heat could play a role in the eventual outcomes.
The first match of the day, between Mexico and Cameroon, will take place in the tropical climate of Natal. A steady rain throughout the match with occasional downpours will lead to deteriorating field conditions as the match progresses.
The final match of the day, taking place in Cuiaba between Chile and Australia, could also be impacted by the heat. Temperatures will still be in the upper 80s F (near 30 C) when the match starts, before cooling off throughout the duration of the match.
This type of heat and humidity can prove challenging even for trained athletes and can result in cramping and dehydration.
The other match taking place in Salvador, will also feature an oppressive combination of heat and humidity as Spain battles Netherlands. A stray shower can also occur, but rainfall will be spotty, unlike the earlier game in Natal.
World Cup officials are ready to issue heat breaks during matches in the tropical locations of Brazil if needed, according to Yahoo Sports.
FIFA stated that 3 minute heat breaks can be issued around the 30th and 75th minute at the referees discretion.
Heat and humidity will continue to play a major role in upcoming games as teams travel from more temperate climates into the tropical climates of western and northern Brazil.
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11 degrees - record early season cold snap.
Denver, CO (1982)
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Early-season snows: Jay Peak 6 inches Warren 5 inches