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At a Glance An unusual weather pattern for early-to-mid August will dominate the central and eastern U.S.

Temperatures will be cooler than average for many areas from the Plains to the East.

The first half of August will continue to not feel terribly summerlike for portions of the central and eastern U.S.

The weather over the eastern two-thirds of the country has been influenced by a trough, or southward dip in the jet stream, for much of the summer, resulting in relatively cool and wet conditions in many areas. This pattern will continue into the second week of August with below-average temperatures prevailing for areas east of the Rockies.

On Sunday morning, record daily low temperatures were broken, including (new record in parentheses) Knoxville, Tennessee (56 degrees).

On Saturday morning, record daily low temperatures were broken or tied, including (new record in parentheses): Cape Girardeau, Missouri (51 degrees); Paducah, Kentucky (52 degrees); Evansville, Indiana (54 degrees); and Nashville, Tennessee (58 degrees, tied).

Yet, another cold front is moving through the central and eastern states early this week with additional rain and thunderstorms, as a general return to a wetter pattern is anticipated.

<img class="styles__noscript__2rw2y" src="https://dsx.weather.com//util/image/w/cool_start_aug_0805.jpg?v=at&w=485&h=273&api=7db9fe61-7414-47b5-9871-e17d87b8b6a0" srcset="https://dsx.weather.com//util/image/w/cool_start_aug_0805.jpg?v=at&w=485&h=273&api=7db9fe61-7414-47b5-9871-e17d87b8b6a0 400w, https://dsx.weather.com//util/image/w/cool_start_aug_0805.jpg?v=ap&w=980&h=551&api=7db9fe61-7414-47b5-9871-e17d87b8b6a0 800w" > The blue contours on the map indicate where cooler-than-average temperatures are expected.

Behind this front, cooler-than-average temperatures are making another appearance. Below is a closer look at this mild early-August forecast.

August's Second Week Forecast

An upper-level trough will remain in place across the central and eastern U.S. for the second week of August, resulting in below-average temperatures along with comfortable dew-point levels for the Plains, Midwest and Northeast.

Yet another cold front will arrive in the Midwest by late this week or next weekend, reinforcing the cool weather regime in that region.

As a result, NOAA's Climate Prediction Center (CPC) has highlighted areas in the Plains and Midwest as having the greatest chance of cooler-than-average temperatures as we look ahead to this weekend and early the following week.

<img class="styles__noscript__2rw2y" src="https://s.w-x.co/staticmaps/DCT_SPECIAL40_1280x720.jpg" srcset="https://s.w-x.co/staticmaps/DCT_SPECIAL40_1280x720.jpg 400w, https://s.w-x.co/staticmaps/DCT_SPECIAL40_1280x720.jpg 800w" > Temperature Outlook

For those looking for summer's searing heat, it should become more humid in the South this week, but clouds and storms may help to suppress temperatures.

(MORE: August Temperature Outlook )

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