Krallu
If you flew into a cumulus cloud its likely you did experience up and down draughts.
Check if your VSI and altimeter are heading in the same direction! cross check that with airspeed.
Rising air airpseed will increase as you are trying to fly level.
Falling air and your airpseed will decrease.
When flying PAX we try and avoid them as they are bumpy If you cannot avoid be sure of where you are heading especially IMC with the embedded variety.
Without radar all you have are your eyeballs to read whats ahead and your best way through and that usually takes some experience.
Look up towards the tops and try and pick the valley sections.
If the bases are above the SSA go below and steer around the rain shafts.
Beware of the Outside temp as the temp will drop in the clouds which could lead to being in icing conditions.
If you experience turbulence reduce speed and dont fight the aircraft (it flies better than you
There is always an arguement whether to do a 180 or carry on.
If you do a 180 make it gradual.
But really check the met for your route and especially the rainfall radar you dont really want to be messing with anything larger than cumulus or towering CU.
Pace