The heat and humidity will build on Wednesday with the likelihood for record breaking temperatures, the National Weather Service says.

Highs will rise into the mid to upper 80s for much of the region, potentially touching 90 degrees in and around the New York City metro area.

High temperatures will be nearly 20 degrees above normal for this date.

The record high for Oct. 2 is 87 degrees at Bradley International Airport in Windsor Locks; 84 in Greenwich; 83 at Sikorsky Memorial Airport in Stratford; and 82 degrees in Danbury and New Haven.

The warm temperatures won’t last long.

A cold front will sink southward from the north will bring scattered showers and thunderstorms this afternoon into early evening.

In the wake of the front, gusty northeast winds will usher in significantly cooler temperatures. Chilly conditions are expected Thursday, with cloudy skies, an increasing chance of showers, gusty easterly winds, and highs generally holding in the 50s to around 60 degrees.

Friday night will have some of the coldest temperatures in months. Friday night’s low will be about 50 degrees colder than Wednesday afternoon.

Inland areas like Litchfield and Torrington could have some patchy frost.

On Friday night, the Long Island Sound shoreline is expected to have temperatures in the low 40s.

Norfolk is forecast to have a low of 33 degrees; Torrington, 34; Litchfield, 35; Danbury, 36; Middletown, 37; and Oxford, 39.

The forecast

Today: A slight chance of showers before noon, then a chance of showers and thunderstorms between noon and 3 p.m., then showers likely and possibly a thunderstorm after 3 p.m. Partly sunny, with a high near 84. Light and variable wind becoming west 6 to 11 mph in the afternoon. Chance of precipitation is 60 percent. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Tonight: A 40 percent chance of showers, mainly after 2am. Mostly cloudy, with a low around 49. North wind 8 to 13 mph.

Thursday: A 50 percent chance of showers. Cloudy, with a high near 56. North wind 5 to 7 mph.

Thursday Night: Rain. Steady temperature around 52. Light and variable wind. Chance of precipitation is 90 percent. New precipitation amounts between a quarter and half of an inch possible.

Friday: Scattered showers before 8 a.m. Mostly cloudy, then gradually becoming sunny, with a high near 63. North wind 10 to 18 mph, with gusts as high as 29 mph. Chance of precipitation is 30 percent.

Friday Night: Clear, with a low around 37.

Saturday: Sunny, with a high near 62.

Saturday Night: Mostly clear, with a low around 42.

Sunday: Partly sunny, with a high near 71.

Sunday Night: A 40 percent chance of showers. Mostly cloudy, with a low around 57.