When you volunteer you're still developing skills, showing commitment and responsibility. Employers place as much value on a volunteer position as they do on a paid position. In fact when you complete your commitment with a volunteer position, it shows what great skills you do have. Employees see what a great, dependable volunteer you are. Sometimes they have leads for you.
Companies do look at their committed volunteers to fill their future job openings.
Summer is a time when lots of extra projects need to be done, pets need to be watched while people are on vacation, local babysitting, and yard work. Make up a simple flier with your information on it, and take it around to your neighbors.