We show that for a sequence of random graphs Brouwer's conjecture holds true with probability tending to one as the number of vertices tends to infinity. Surprisingly, it was found that a similar statement holds true for weighted graphs with possible negative weights as well. For graphs with a fixed number of vertices, the result implies that there are constants $C>0$ and $n_{0}$ such that if $n\geq n_{0}$ then among all $2^{n \choose 2}$ graphs with $n$ vertices, at least $\left(1-\exp\left(-Cn\right)\right)2^{n \choose 2}$ graphs satisfy Brouwer's conjecture.