Following Formula 1’s five week summer break, the bad weather disrupted both practice sessions.
With limited running in the first session, fans were left disappointed as many teams found the circuit too dangerous to drive in the second.
In the end, it was Sauber’s Kobayashi who finished fastest in the first session, 0.552 seconds quicker than Williams’ Pastor Maldonado.
Marussia’s Charles Pic took the fastest time in second practice with only 10 drivers setting a time and all of those were posted in the dying moments.
Showing the extent of the washout, Force India’s Nico Hulkenberg completed five laps of the circuit – the most of any driver.
Mercedes’ Michael Schumacher, who is celebrating his 300th Grand Prix this weekend,
demonstrated the wet conditions as he took a slide in the Eau Rouge corner.
Practice ended in a big cloud of smoke and engine failure for Ferrari’s Felipe Massa, who is the subject of much speculation over his future at Ferrari.
His team-mate Fernando Alonso, the current world championship leader, joined both Lotus drivers Kimi Raikkonen and Romain Grosjean as one of few drivers who did not do a flying lap.
The bad conditions meant that the large number of upgrades brought to the cars after the break were not properly tested.
However, the weather does look set to improve for the rest of the weekend.
1 Kamui Kobayashi Japan Sauber-Ferrari 2m 11.389s
2 Pastor Maldonado Venezuela Williams-Renault 2m 11.941s
3 Daniel Ricciardo Australia Toro Rosso-Ferrari 2m 12.004s
4 Jean-Eric Vergne France Toro Rosso-Ferrari 2m 12.824s
5 Mark Webber Australia Red Bull-Renault 2m 13.191s
6 Sergio Perez Mexico Sauber-Ferrari 2m 13.861s
7 Nico Rosberg Germany Mercedes-Mercedes 2m 14.210s
8 Valtteri Bottas Finland Williams-Renault 2m 14.660s
9 Sebastian Vettel Germany Red Bull-Renault 2m 14.860s
10 Michael Schumacher Germany Mercedes-Mercedes 2m 15.402s
11 Paul di Resta Britain Force India-Mercedes 2m 15.812s
12 Timo Glock Germany Marussia-Cosworth 2m 16.409s
13 Nico Hulkenberg Germany Force India-Mercedes 2m 16.786s
14 Vitaly Petrov Russia Caterham-Renault 2m 16.788s
15 Lewis Hamilton Britain McLaren-Mercedes 2m 16.827s
16 Jenson Button Britain McLaren-Mercedes 2m 16.861s
17 Charles Pic France Marussia -Cosworth 2m 17.519s
18 Heikki Kovalainen Finland Caterham-Renault 2m 18.199s
19 Pedro de la Rosa Spain HRT-Cosworth 2m 19.546s
20 Dani Clos Spain HRT-Cosworth 2m 19.689s
21 Romain Grosjean France Lotus-Renault 2m 38.701s
22 Fernando Alonso Spain Ferrari-Ferrari 2m 40.749s
23 Kimi Raikkonen Finland Lotus-Renault 2m 46.580s
24 Felipe Massa Brazil Ferrari-Ferrari no time
25 Bruno Senna Brazil Williams-Renault no time
26 Narain Karthikeyan India HRT-Cosworth no time
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