It’ll be a crisp fall day with daytime temperatures in the mid 60s and overnight lows in the 40s for your Thanksgiving Day holiday feast.

There is a small chance of rain so pack the umbrella if you are headed out to Grandma’s house or for pre-Black Friday sales.

The National Weather Service forecast for Los Angeles and vicinity on Thursday calls for a 20 percent chance of showers. Mostly sunny, with a high near 65.

Thursday night there is a 20 percent chance of showers before 10 p.m., then partly cloudy, with a low around 45.

There could still be some lingering showers Friday, but we’ll have partly sunny skies  with clouds through the weekend. But for Southern Californians used to warm temperatures, it’ll continue to feel brisk with daytime highs in the mid to lower 60s and overnight lows in the mid to lower 40s.

The cold snap is all due to a cold low-pressure system sitting over most of the western United States, bringing brisk temperatures to the Southland and snow and freezing weather to much of the upper mid-west. That won’t change much until Sunday, when it’ll start being just a bit warmer.

In Coastal Orange County the forecast for Thursday calls isolated showers. Mostly sunny, with a high near 62. Chance of precipitation is 20 percent.

Thursday night there will be a 20 percent chance of showers. Partly cloudy, with a low around 45.

Friday there is a 20 percent chance of showers before 10 a.m. Mostly sunny, with a high near 62.

The ultraviolet index level in the Los Angeles area for Thursday is a low 3, according to the weather service. A reading of 3-4 is considered a low exposure level, reducing the danger range for those with fair complexions to 15-20 minutes if not protected.

Here are the latest temperatures and conditions around Southern California:

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