The ornamental design for a raincap with a visor, as shown and described.
FIG. 1 is a top-front-left perspective view of a rain cap with a visor showing my new design;
FIG. 2 is a top-front-right perspective view thereof;
FIG. 3 is a bottom-front-right perspective view thereof;
FIG. 4 is a front elevational view thereof;
FIG. 5 is a rear elevational view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom view thereof;
FIG. 8 is a right-side elevational view thereof; and,
FIG. 9 is a left-side elevational view thereof.
The broken lines showing of visor wheels in FIGS. 1-4 and 6-9 are included for the purpose of showing environmental structure and form no part of the claimed design.