Following on from the post “Disable the Password Strength Meter in WooCommerce“, it turns out it’s actually possible to decrease the strength required for your customers passwords. This is likely a much better option than disabling it completely, in most scenarios.

The default strength is 3, and can range from 0 (non-existent) to 5 (ridiculously strong). You can change this by adding the following filter in you functions.php file, or adding the code using the Code Snippets plugin:

/**
 * Change min password strength.
 *
 * @author James Kemp (Iconic)
 * @link http://iconicwp.com/decrease-strength-required-woocommerce-passwords/
 * @param int $strength
 * @return int
 */
function iconic_min_password_strength( $strength ) {
    return 2;
}

add_filter( 'woocommerce_min_password_strength', 'iconic_min_password_strength', 10, 1 );