The Magpies led Watford thanks to a superb goal from Allan Saint-Maximin shortly after half-time, however the Hornets fired back shortly before the full-time whistle.
Joao Pedro gifted the visitors a point and Eddie Howe was left to continue his search for only their second win of the campaign.
The draw leaves Newcastle in 19th place – only one point above Burnley, who have three games in hand.
The Tyneside club face a trip to Leeds United next weekend.
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The draw leaves Newcastle in 19th place – only one point above Burnley, who have three games in hand.