Fairfield forecast: Warm start for half marathon, wet finish to day

With thousands of runners expected to compete this morning in the annual Fairfield Half Marthon, the sunny and warm conditions will prove to be yet another challenge to competitors over the 13.1-mile course through town.

But this morning's weather won't be as challenging as the stormy conditions that the National Weather Service says will move across the region tonight.

The daytime high temperature in southwestern Connecticut is expected to rise to the low-80s under sunny skies with a north wind 6 to 8 mph becoming west.

Showers and thunderstorms are likely late tonight and into early tomorrow, the NWS says. The overnight temperature will dip to a low in the mid-60s with a southwest wind between 5 and 7 mph.

Tomorrow, scattered showers and thunderstorms are again likely through late afternoon, as clouds prevail and the temperature rises to a high in the mid-70s. There could be a few more showers tomorrow night, and the low temperature will be in the upper-50s.

Tuesday, there remains a chance of showers -- and possibly thunderstorms -- throughout the day. Otherwise, however, skies are expected to be partly cloudy and the temperature will rise to the mid-70s. There is still a chance of showers Tuesday night and low temperatures will register about 60 degrees.

The outlook for Wednesday, the weather service says, is mostly sunny and temperatures in the upper-70s.