Intemperate, harsh (9)
I believe the answer is:
inclement
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">intemperate</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(similar in meaning)</span><br/ ><br/ >'<span class="explanation-format__original">harsh</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(both can describe bad weather)</span><br/ ><br/ ></span>
(Other definitions for inclement that I've seen before include "bitter" , "(Of weather) cold or wet" , "(Of weather) bad" , "Weather so awful" , "severe" .)