Your regular expression is requiring the last slash be present which it will not be by default. So the path tides/mylocation/ is shortened to tides/mylocation and then tested. Instead, wrap the last part in an optional group using the ? and update the match number.
add_rewrite_rule('tides/([^/]+)(/([^/]+))?', 'index.php?page_id=4348&location=$matches[1]&month=$matches[3]', 'top');
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