While Thursday and Friday should bring bad weather to Shelton, Saturday and Sunday look fantastic, with lots of sun and minimal humidity, according to the National Weather Service (NWS).. Here is the NWS weather forecast for Shelton for the rest of the week: Thursday: Showers and thunderstorms likely, mainly after noon, with heavy rain possible. A daytime high near 84. More showers possible at night, with heavy rain possible. A nighttime low around 70. Friday (Fourth of July): Showers likely before 3 p.m., then a chance of showers in the late afternoon and early evening. A daytime high around 77, and an overnight low in the high 50s. Saturday (Shelton fireworks at night): Sunny, with a high near 80. At night, mostly clear and a low around 60. Sunday: Sunny, with a high around 82 and an overnight low in the mid-60s.