If it starts to feel uncomfortable due to rapid changes in air temperature, which phrase might describe that?

Feeling uncomfortable due to rapid changes in air temperature is often associated with hot weather. When temperatures rise quickly, human bodies may struggle to acclimate, leading to a sense of discomfort. This discomfort can manifest physically, as people may feel overheated or experience increased sweating.

Hot weather can lead to sensations that are often described in terms of heat, such as feeling sticky or clammy, which results from sweating trying to cool down the body. In contrast, the other options—rainy, sunny, and windy—do not specifically indicate a rapid or uncomfortable increase in temperature. Rainy weather is usually associated with cooler temperatures, sunny weather might imply heat but not necessarily sudden changes, and windy conditions can sometimes provide relief from heat rather than discomfort caused by rapid temperature shifts.

Therefore, the phrase that best captures the feeling of discomfort due to quick rises in air temperature is "It's hot."