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On a sunny day.  Because the air is dry as compared to on a cloudy day. 
Dry means there is less (relative) humidity of air.  On a sunny day air will take more time to get saturated and so it absorbs more water.

On a wet day or cloudy day, the humidity is more in air, so air can absorb less from  land or clothes etc. air gets saturated with water quicker.

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In sunny day because in sunny day temperature is more and it evaporated to form water vapour which again gets down by condensation of cloud