Millions under US heat warnings as record temperatures to continue

Phoenix expected to hit 116F (46C) on Monday as thunderstorms also likely across US for Fourth of July holiday

Millions across the US have been caught up in dangerous weather conditions over the weekend and are braced for further extreme conditions ahead of the 4 July holiday, as thunderstorms and intense heat continue to affect much of the country.

As of Monday, 36m people are under excessive heat warnings in the US, particularly in the south and western areas, reported ABC News. Record high temperatures in some places will likely remain as many gear up to celebrate the Independence Day holiday on Tuesday.