was لان الموضوع يتعلق بالمضارع عشان قال the weather is فمعني كده انها امنيه في المضارع كان يتمني شئ ليكون موجد في المضارع
اما بالنسبه لwould be فغلط عشان دي مش مستقبل
ارجوا ان اكون قدرت افسر الفرق

I think the correct answer is
the weather is terrible today. I wish it were warmer
was is an acceptable answer but were is more correct
would be isn't correct because I wish it were warmer now
Mr Ali Sobhi
Zahraa Helwan sec. school

in my modest point of view it's better to be the weather is terrible today. i wish it were warmer using were is better than was Mr. Essam Mohamed Alrahmania prep school

was because he said "today "

was is the correct answer

was is better but were is the best
the weather may be changed at any moment so it is possible not impossible

was has no sense here so would be is better and he speaks about the future from the moment of speaking