Lewis Hamilton continued to set the pace at Montreal as he posted the quickest lap time before crashing out when wet weather stuck the Circuit Gilles Villeneuve.
Hamilton, who topped a dry first session, made amends after bouncing across the kerbs on his first flying lap to clock a time of 1:15.988 on the Option tyres during a busy opening to the session as teams fitted in running prior to the forecasted rain.
It duly arrived after 35 minutes but Hamilton – and Nico Rosberg – opted to return to the circuit on Intermediate tyres despite the torrential conditions.
Hamilton ran wide at Turn 8 before skating straight on when he tried to slow down for Turn 10, lightly tapping the barriers.
The session was then stopped due to the weather conditions but no one went out again when it restarted with half an hour remaining as rain continued to batter the circuit.
Sebastian Vettel set the second fastest time for Ferrari, three-tenths down on Hamilton and just 0.006s ahead of team-mate Kimi Räikkönen.
Nico Rosberg was fourth for Mercedes, within half a second of the time achieved by his team-mate.
Lotus’ encouraging pace from the opening session continued as Pastor Maldonado and Romain Grosjean were fifth and seventh, split by the Williams of Valtteri Bottas.
Felipe Massa placed eighth in the other Williams, while Red Bull pair Daniil Kvyat and Daniel Ricciardo rounded out the top 10.
Nico Hülkenberg suffered a rim-related puncture early on in the session and placed 11th, ahead of Marcus Ericsson, Carlos Sainz Jr. and Sergio Pérez.
Fernando Alonso was 15th quickest for McLaren, while Max Verstappen, Felipe Nasr, Jenson Button, Roberto Merhi and Will Stevens completed the runners.
|9||26||Daniil Kvyat||Red Bull||1:17.092||+1.104s||10|
|10||3||Daniel Ricciardo||Red Bull||1:17.111||+1.123s||16|
|11||27||Nico Hulkenberg||Force India||1:17.120||+1.132s||15|
|13||55||Carlos Sainz||Toro Rosso||1:17.318||+1.330s||23|
|14||11||Sergio Perez||Force India||1:17.367||+1.379s||20|
|16||33||Max Verstappen||Toro Rosso||1:17.657||+1.669s||23|