Honda figures hope for wet Belgium
The Japanese outfit, just eighth in the constructors' championship, struggled at Valencia two weeks ago.
Six of the team's 14 points so far in 2008 were scored by Rubens Barrichello in the wet British grand prix.
"The weather conditions really helped us to get the best out of the car," said the Brazilian, the event having marked his first podium since 2006.
Barrichello, whose outing on the Spanish streets at Valencia was disastrous, believes the Monza test last week resolved his braking problems.
Teammate Jenson Button is also hoping the forecasts for rain at Spa-Francorchamps are right, saying "the weather can play a big part in the race weekend which is great for us as the car goes well in the wet".
Team principal Ross Brawn added: "We have seen already this season that our car can perform rather better in the wet than the dry. I for one would certainly not object to an inclement weekend."