After morning clouds clear from the region, temperatures today in southwestern Connecticut will rise to the mid-70s -- and keep rising sharply to hazardously high levels tomorrow, the National Weather Service warns.

Skies today by early afternoon should become mostly sunny, with a south wind between 8 and 11 mph.

Tonight will be mostly cloudy, with a low temperature in the upper-60s and a south wind between 4 and 7 mph, becoming calm.

Tomorrow, in issuing a "hazardous weather outlook" for the region, the NWS says the daytime high temperature will be in the upper-90s, and when taking into account humidity, the heat index is expected to feel as though it is 100 degrees and above.

Tomorrow night will be mostly clear, with a low temperature in the low-70s.

Thursday is also expected to be extremely hot under sunny skies, with temperatures rising to the mid-90s. Thursday night will be partly cloudy, with a low temperature in the low-70s.

On Friday, there is a chance of showers and thunderstorms as skies turn mostly cloudy and the high temperatures cool to the upper-80s level. Friday night will be partly cloudy, with a low temperature in the mid-60s.

The outlook for Saturday, according to the weather service, is sunny and temperatures in the 80s.