warm weather
暄 centers on mild, pleasant warmth, especially in the air or weather. It describes the comfortable heat of a sunny day rather than intense heat.
暄 combines 日 (sun) with 宣, which likely contributes the sound and may carry a sense of spreading or extending, suggesting warmth spread by the sun.
The sun 日 on the left and 宣 on the right look like a warm announcement: the sun is spreading its gentle heat, making the weather pleasantly warm.
For ケン, imagine Ken enjoying the warm weather outside: Ken -> ケン, and the sun keeps him comfortably warm.