September is historically the worst month for the S&P 500. However, August wasn't a great one. The major index slipped 1.5% lower after delivering a 19.5% gain in the preceding seven months.

Even with the S&P 500 stumbling somewhat, there were a few winners. Should you still buy the S&P 500's best-performing August stocks? Here they are, along with their pros and cons.

Arista Networks' (NYSE: ANET) shares jumped nearly 26% in August. That was enough to make the network-equipment stock the best performer in the S&P 500 for the month. Arista stock has soared more than 60% so far this year.

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Source Fool.com