check the coolant level - inside the radiator, not the expansion bottle.
 should be full to the top.  check only when cold.

when refilling, use a good quality long life anti-freeze diluted with
distilled water.

-------------------------

You've allowed AIR into the cooling system by forgetting to keep the
system full enough. The air will displace itself in about three 'trips'
as long as there's some reserve in (of all places) the reservoir. Like
Jim said use good coolant, preferably HONDA premix and do it _according
to the owner's manual_. Fill the coolant reservoir to MAX and add as
necessary for three days. It will appear to 'sip' coolant so you have to
 add some each morning.

Don't overheat a HONDA ! !

'Curly'

   If it's not low coolant, it's a bad temp sensor.