Expressing "hot" with 火热 and 炎热

The adjective 炎热

is used when talking about hot weather or hot climate.

Examples

这样炎热的天气还会持续多久？

How long will this heat last?

zhèyàng yánrè de tiānqì hái huì chíxù duōjiǔ

游客们会遇到炎热潮湿的天气状况

Tourists will encounter hot and humid weather

yóukèmen huì yùdào yánrè cháoshī de tiānqì zhuàngkuàng

疟疾是许多气候炎热国家的流行病

Malaria is an epidemic in many countries with hot climates

nüèji shì xǔduō qìhòu yánrè guójiā de liúxíng bìng

The adjective 火热

is used when talking about human feelings or body temperature.

Examples

河边的风很大，我们身体前面被烤得火热，后背却感到很冷

A strong wind was blowing by the river. The front of our bodies were hot, but our backs felt very cold

hébiān de fēng hěn dà, wǒmen shēntǐ qiánmian bèi kǎo de huǒrè, hòubèi què gǎndào hěn lěng

我们感受到其实人人都有一颗火热的心

We feel that everyone has a warm heart

wǒmen gǎnshòudào qíshí rénrén dōu yǒu yì kē huǒrè de xīn

我无法忍受这种火热的痛苦

I can't bear this pain

wǒ wúfǎ rěnshòu zhè zhǒng huǒrè de tòngkǔ