There was only 55 minutes play possible before the rain came down in Cardiff, in which time Glamorgan added an extra batting bonus point
Cardiff (fourth day of four): Worcestershire 454-9 dec, Glamorgan 295, 5-0 - match drawn
Glamorgan moved into the second promotion place in Division Two with a rain-affected draw against Worcestershire, ahead of their crunch match against main rivals Middlesex next week.
Eight points each for the draw, along with four bonus points for Glamorgan and six for Worcestershire, took Glamorgan seven points ahead of Middlesex in the LV= Insurance County Championship while Worcestershire may feel their promotion hopes have almost gone.
There was only 55 minutes play possible before the rain came down in Cardiff, in which time Glamorgan added an extra batting bonus point and got within sight of a second and saving the follow on before losing their final wicket five runs short of the first target and ten runs short of the second.
That allowed Ben Gibbon and Dillon Pennington to end the Glamorgan first innings with four wickets apiece, while Glamorgan's Chris Cooke moved onto an unbeaten half century.
Glamorgan started the day aiming to earn more batting bonus points and then saving the follow on which would have meant scoring 305.
Glamorgan have climbed above Middlesex in Division Two (Ryan Hiscott/Getty Images)
Worcestershire's target was more simple, just to get 12 wickets in the day to get the win which would have put them right back in the promotion race.
Both sides would have been looking at the weather forecasts with interest, albeit with different emotions, but the start of the day was bright and the match started on time.
With the new ball imminent, Worcestershire began with spinners Jake Libby and Brett D'Oliveira. Glamorgan's pairing of Cooke and Ajaz Patel were able to easily pass that first target of 250 for the second batting point.
Patel edged behind to give Gibbon his fourth wicket, but Michael Hogan showed his intention with a straight six off the same bowler and Glamorgan raced towards the next target of 300.
Reaching the follow on mark would have seemed a long way away at the start of play, but in the end Glamorgan would have been disappointed to fall short at 295 all out when Hogan chipped the ball to Jack Haynes at midwicket for Pennington to also finish with four wickets.
Worcestershire enforced the follow-on, but Glamorgan openers David Lloyd and Ed Byrom only had to survive nine balls before the rain came down and the game was abandoned early afternoon.