CD accounts can still be valuable for savers this September, assuming they avoid some costly mistakes. OsakaWayne Studios /Getty Images

Certificate of deposit (CD) accounts have been so favorable for savers for so long that it almost seems like there's no way to negate the benefits of these accounts. Simply deposit an amount of money you're comfortable temporarily parting with and be rewarded with a high rate of return. With rates hitting as high as 6% in recent years and rates still readily available around 4.50% now, this has been one of the better and safer ways to grow your savings without having to worry about market volatility.

But that could be changing as soon as this September. With a new Fed rate cut looming for later in the month and the reality that a cooler rat

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