someone who is hot is very attractive sexually.
1. It's pretty hot, isn't it?
"It's pretty hot, isn't it?" is useful when the weather is hot - maybe almost too hot.
2. It's absolutely boiling!
This is used when the weather is unusually hot.
3. It's positively tropical today.
Used when the weather is unusually hot.
4. We're having a heatwave!
Used when the weather has been very hot for a number of days.
5. It's so hot! It must be over 40.
This is like maybe it's almost too hot. Note we use Fahrenheit degrees.
6. It's nice and warm today.
We often combine 'nice' + 'warm' to be very positive.
7. It's nice in the sun.
Useful for winter days (remember them?). In the sun it's nice, but in the shade it may be cold
8. The weather's lovely.
A common general expression.
9. It's a lovely day.
Same as the previous one.
10. It's sunny today, isn't it?
The most common expression taught in books.