If you move to an inland site and away from the effects of the Bay (e.g. GSSP) then you might see these clouds on a hot summer day. Cumulus clouds of this type look like cotton puffs. They are formed by warm, moist air rising due to the heat of the afternoon. When the air reaches the point where it is cool enough, clouds form.
These clouds are driven by the heat and convection. They will probably go away when the sun sets; however, if the sky is thickly covered or if the clouds have developed beyond the Cumulus stage, then the evening may be lost.