Newcastle's chances of sneaking into the play-offs are all but over the Jets could only manage a 1-1 draw with Sydney at EnergyAustralia Stadium on Sunday afternoon.
The Jets had plenty of chances to score in a scrappy first half but couldn't deliver the final blow, while Brazilian Bruno Cazarine showed no such hesitation to put the visitors in the lead in the 76th minute.
Newcastle fought back to level via veteran striker Sasho Petrvoski in the 84th minute and almost snatched a late winner through skipper Nikolai Topor-Stanley but it wasn't to be and the sides had to settle for a share of the points.
The draw virtually ends Newcastle's season as they are now on 32 points, six behind the sixth-placed Wellington Phoenix with both teams having two games to play, while for Sydney the draw means their focus now shifts to their upcoming Asian Champions League campaign.
Match day started in heatwave conditions of 39 degrees but by kick-off it had changed dramatically with a fierce southerly wind and driving rain to make for miserable football weather.
Despite the gloom the Jets started brightly and could have been two goals to the good within the first 15 minutes.
An Ali Abbas free-kick from 30 yards resulted in a goal-mouth scramble in the eighth minute that saw a desperate Sydney defence thrash the ball away.
Just moments later New Zealand international Jeremy Brockie failed to take advantage of an open goal after a Mario Simic cross was squirted under Sydney goalkeeper Ivan Necevski before Stuart Musalik cleared Topor-Stanley's header off the line.
The Jets maintained their pressure and had another of chances on goal with Labinot Haliti, Brockie and Marko Jesic firing wide of the mark.
Down the other end the Sydney attack was eventually forcing their way into the game with Cazarine just beaten to the ball by Newcastle goalkeeper Ben Kennedy, former Jet Nicky Carle firing over the crossbar and livewire Dimitri Petraos looking dangerous on the counter.
The best chance of the first half fell to Haliti in the 43rd minute. Tarek elrich unleased a fierce shot from 30 yards and Haliti managed to deflect it goalward only to see it cannon off the crossbar to see the teams locked at 0-0 at half-time.
Sydney started the second half with more intent with Carle forcing two good saves from Kennedy before a shot on the turn by Scott Jamieson blazed narrowly over the crossbar.
The Jets had claims for a handball after an Abbas corner but referee Peter Green waved play on.
Haliti should have scored when he rose high at the backpost to meet a pinpoint cross from Jobe Wheelhouse only to see it shave the post.
Sydney broke the deadlock in the 76th minute when Cazarine showed too much strength to hold off defender Sam Gallaway and slot home from a narrow angle after he had taken possession from a Jamieson throw-in.
The Jets didn't give up and duly drew level eight minutes later via veteran striker Petrovski. Wheelhouse sent a dangerous free-kick into the box where Topor-Stanley headed back across goal for Petrovski slotted home from three yards.
With their season on the line the Jets launched into a frantic attacking raid in the final minutes.
Jesic slide a shot just across the face of goal before Topor-Stanley went within inches of grabbing the winner in injury time.
An Elrich