Rain Monday isn’t just a possibility, but a guarantee — the start of what could be a wild week of weather, the National Weather Service said.

Forecasters predicted a 100% chance of rain Monday, followed by sunshine and temperatures into the mid-50s Tuesday. More rain is in the forecast Wednesday evening, with overnight temperatures dipping into the mid-30s Wednesday night and into the mid-to-upper 20s Thursday night. There’s even a chance of snow on Friday.

All of this began with cloud cover and rainfall Monday morning. Doppler radar showed clearing skies by about 11 a.m., but another band of rainfall is due later in the day, with heavier rainfall after 10 p.m., the weather service said. That rain will likely continue through the morning rush hour on Tuesday, before clearing skies bring a brief reprieve.

However, the weather service was calling for rain again Wednesday afternoon, likely after 1 p.m., and continuing into the overnight.

There’s a chance of snow — or, at very least, rain — before 10 a.m. Friday, that threat continuing throughout the day.

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Updated 31 minutes ago LI researcher braves cold in Antarctica ... Where to eat at Roosevelt Field ... Get the latest news and more great videos at NewsdayTV

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