Around this time of year, the nights lengthen, cool air begins to pool over Canada, and the long shadow of winter looms over much of the country.
High temperatures the first part of this week reached record levels, with some places soaring well into the 90s and lower 100s clear to the coast. Places such as San Francisco had their warmest temperatures in over a year, and some spots even reached near 110 degrees.
As the strong high pressure responsible for this extreme heat weakens and pushes off to the south, cooler air on a westerly wind will continue to filter in from the Pacific, allowing temperatures to become gradually cooler. This cooling trend is expected to continue.
A storm system developing well offshore will start to approach the coast of California this weekend.
Clouds will start to increase across the northern and central parts of the state later Sunday, before filtering into the rest of the state early next week. A few showers are even possible near the coast.
Temperatures across central and Southern California will drop to as much as 5-10 degrees below normal by Monday and Tuesday, especially from San Francisco southward to Los Angeles and San Diego.
The cool and increasingly showery weather should last into at least the middle part of next week as the low drifts over the state.
Stay with AccuWeather.com for the latest on this cooldown and the potentially showery weather ahead for next week.
Even so, for the main population centers such as London, Birmingham and even Glasgow, it will be far from a washout.
While Hurricane Ignacio is expected to pass north of Hawaii early this week, the island chain will not be able to escape all of the impacts.
Fred became the second hurricane of the 2015 Atlantic season and will blast the Cape Verde Islands early this week.
Typhoons and building drought will impact more than one billion people in southeastern Asia this fall.
The combination of moisture from Erika and a non-tropical system will drench areas from Florida to the Carolina coast through Tuesday.
A 14-year-old boy from Texas died Sunday after contracting a brain-eating amoeba that thrives in warm freshwater.
Los Angeles, CA (1955)
110 degrees, hottest day ever in September. This mark was tied September 4, 1988.
Milwaukee, WI (1988)
Hottest summer on record. Six days of 100 degrees or greater and 36 days of 90 or above. Average temperature of 73.8 beat the old record of 72.8 set in 1921 and 1955. The normal average tempera- ture for a summer in Milwaukee is 68.3 degrees.
Washington Co., IA (1897)
Hail fell and drifted in piles 6 feet deep in Washington County.