Stating the obvious have you watered it thoroughly?

yes i did water it.

It has been raining quite a bit lately so i didn't water for 2 days.. I guess rain water didn't really reach the soil

but i watered it as soon as I saw in this condition and it seems to have improved by midnight

Rain isn't usually sufficient for containers, especially in hot weather, even if there's a lot of it because the surface area is too small to receive sufficient water.

Mine wilts pretty fast, other plants under same conditions may be ok, but this seems to need extra water.