Sunday morning's warm-up session for the Honda Indy Toronto concluded with the unusual spectacle of three Honda-powered cars at the top of the timesheets.

Andretti Autosport's Carlos Munoz led the way with the best time of the morning clocking in at 1:00.2119s (104.929mph) on the 11-turn, 1.755-mile temporary street course around Toronto's Exhibition Place.

He was 0.0640s faster than Rahal Letterman Lanigan Racing's Graham Rahal, while third fastest in the session was Schmidt Peterson Motorsport's Conor Day in the #5 car usually driven by James Hinchcliffe, who is currently sidelined through injury but who is in Toronto to serve as the grand marshal for this weekend's event.

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CLICK: Full Sunday morning warm-up times from Toronto

The 30-minute session was held on a wet but drying track after early morning rain relented just in time for the start of warm-up. However, the rain picked up again towards the end of the session.

"It's very much like a polished concrete. You look in the mirror, if the sun is at the right angle, it shines, which shows you how slick it is," explained KVSH Racing's Sebastien Bourdais, who won the first of last year's doubleheader events here. "When you throw some water on it, it's definitely quite exciting. It's very unpredictable. You go into the corner and you catch the car, you lose the car, catch the car again."

"The visibility can be very treacherous on the back straightaway," added the Frenchman, who will line-up in fifth place on the grid for the start of today' race. "It's a lot of things to overcome and it would be a shame if it was raining during [this] race. We all know how tough it will be to race in; it's more about survival at that point."

Concerns about further weather fronts heading toward the area have meant that driver introductions have been cancelled and the start time for the Honda Indy Toronto moved up by half an hour, so that the green flag for start of the 85-lap, 149.175-mile race is now scheduled for just after 3pm (8pm BST).

Tony Kanaan was the fastest of the Chevrolet contingent in the session, 0.1355s off Munoz' pace. Kanaan was fourth fastest just ahead of his Ganassi team mates Scott Dixon and Charlie Kimball who were sixth and seventh respectively in the final timings.

Simon Pagenaud was the fastest of the four-car Penske squad in eighth place. He'll start this afternoon's race n the front row alongside his team mate, pole winner Will Power, who was only 16th fastest in the warm-up as he conducted 25 shakedown laps in total.

Despite the tricky track conditions there were no noteworthy mishaps during the warm-up. Rodolfo Gonzalez, who crashed in the #18 Dale Coyne Racing entry during on Saturday afternoon, was able to participate fully in the session after the team repaired the car overnight meaning that he will be able to line-up at the back of the grid for the green flag.

See full Sunday morning warm-up times from Toronto