Lately we've had a heat wave in southern Poland, with temperatures reaching up to 36 Celsius. This seems like a good opportunity to point out that we DON'T say:
He has a temperature [of 39.8 degrees].
When we're talking about the atmospheric temperature, we use it, as we do in many other weather-related expressions:
It's 36 degrees.
If we want to give the temperature scale, we add it after the number, without of:
It's 36 degrees Celsius, or about 97 degrees Fahrenheit.
Sometimes we add the word out, to indicate that the temperature we are citing is the outdoor temperature, not the temperature in the house:
It's 36 degrees out.
Remember that we also normally use it to talk about current weather conditions:
It's hot and sunny.
It's hot, hazy and humid.
It's cloudy and grey.
Here's a typical exchange about the weather:
She: Have you been outside? What's the weather like today?
He: It's hot, hazy and humid.
She: How hot is it?
He: It's 36 in the shade. (Here, we drop the word degrees, and specify that the temperature is measured in the shade, not in full sun).
She: But it's not raining, is it?
He: No, but it looks like we might get a thunderstorm later.