Hamilton, along with teammate Nico Rosberg, suffered problems with the tyres at the Bahrain Grand Prix at the weekend, but the Brit is hopeful that cooler weather will aid the car.
"We got a lot of information from these first four races to know that going to a cooler Europe will be good for us. It is good to get one of the most difficult races of the year out of the way in terms of heat, but there are a lot of areas that we need to improve on," he told AutoSport.
"To get fifth, two thirds and a fifth [in the first four races], though, I could not be happier. When I decided to join the team I knew potentially it could be a lot worse than that."
Sebastian Vettel finished first in Bahrain.