What should I do because of thunderstorm in the middle of a football match?

Chapter V Referee (Rules of Football Match)

Resolution of the International Football Council

Resolution 1

Referees (also applicable to assistant referees or fourth officials) are not responsible for the following situations:

Any injury to team members, officials or spectators;

Any damage to any property;

Any loss suffered by any individual, club, company, association or similar institution due to or likely to be due to its judgment according to the competition rules or the requirements of maintaining, conducting and controlling the competition according to normal procedures.

This may include:

The referee decides whether to play or not according to the influence of the venue and its surroundings or the weather;

Decided to cancel the game for various reasons;

Determine the equipment used in the competition and its fixation, including goalposts, beams, corner flagpoles and competition balls;

Decide whether to stop the game due to the influence of the audience or any problems of the audience;

Decide whether to stop the competition and allow the injured players to move out of the competition venue for treatment;

Deciding to require or insist on removing injured players from the playing field for treatment;

Decide whether players can wear specific clothes or equipment;

Decide whether to allow anyone (including team or venue officials, security officials, photographers or other media representatives) to appear near the competition venues (within their responsibilities);

A referee made according to the rules of the game or according to the rules or regulations formulated by FIFA, intercontinental Federation, national association or alliance for the game.

Therefore, it is up to the referee to decide whether the rain will stop because of the thunderstorm.