What kind of “hard days” did the Hydrometeorological Center promise Muscovites?

Even at night, according to him, the heat will not weaken much, the thermometer will show up to 18 degrees Celsius, and in the center of Moscow — up to 20-23 degrees. 
What will the weather be like in Moscow on Sunday? On Sunday, the forecaster expects the weather vector to change. about  26-28 degrees, Vilfand noticed. The sky will be covered with clouds, it may rain with thunderstorms and wind gusts up to 20 meters per second, the expert says. He called such indicators close to the record for the entire history of meteorological observations. Sources:  https://tass.ru
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Истoчник aif.ru Roman Vilfand, scientific director of the Hydrometeorological Center of Russia, explained in a TASS commentarythatvery hot weather is expected with temperatures up to 33-34 degrees Celsius. Forecasters warn of rising temperatures and abnormal heat on Friday (August 5) and Saturday (August 6).  
“Tough days ahead of us. How hot will it be on August 5 and 6? And on Monday, weather forecasters promise light rains. Expert Answer + –

August 5 and 6 will be “hard days” for the residents of the Russian capital. So, according to his forecast, in the southeast of the Moscow region, there is a high probability of a temperature rise to a record 34 degrees. It will become much cooler — the temperature will drop to 21-26 degrees Celsius. According to preliminary calculations, August 5 and 6 will be in second place in the rank of the hottest days (we are talking about the rank for these dates) — 31-33 degrees are predicted», — said Vilfand.