Kiddush Levanah on a cloudy night

Hi,

If the moon is concealed by a thick cloud, one may not recite Kiddush Levanah. However, if the cloud layer is thin, such that the moon is clearly visible through it, one may recite Kiddush Levanah.

One who begins the berachah when the moon is clearly visible may complete it even if clouds then pass before the moon.

(Mishneh Berurah 426:3)

Have a great day,
Mordechai