Sunny Sunday Ahead of Potential Freeze in St. Louis

Breezy conditions and a risk of sub-freezing temperatures on Monday night into Tuesday morning

Apr. 5, 2026 at 3:09pm

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St. Louis is expected to have a sunny but breezy Sunday with highs near 59°F. However, the National Weather Service warns of a potential freeze risk across parts of northeastern Missouri and west-central Illinois on Tuesday morning, April 7th, 2026, as a band of light precipitation could develop Monday night into Tuesday morning, possibly changing over to light snow where temperatures drop below freezing.

Why it matters

Sudden drops in temperature can pose a threat to tender vegetation, so gardeners and those with potted or newly planted plants will need to take precautions to protect them before the cold front moves in on Monday night.

The details

Sunday will see sunny skies and temperatures around 43°F in the morning, reaching a high near 59°F. However, gusty northwest winds of 9 to 13 mph, with gusts up to 21 mph, may make it feel a bit brisk. The winds could also impact lightweight yard items and make for a blustery riverfront walk or bike ride. Overnight lows on Sunday will be around 42°F.

  • Sunday, April 6, 2026: Sunny with a high near 59°F and breezy conditions.
  • Monday night into Tuesday, April 6-7, 2026: 40-70% chance of temperatures dipping below freezing, with a potential for light precipitation that could change over to light snow.

The players

National Weather Service

The federal agency responsible for weather forecasting and issuing weather-related warnings and advisories.

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What’s next

The National Weather Service in St. Louis will continue to monitor the situation and provide updates on the potential freeze risk and any precipitation that may occur on Monday night into Tuesday morning.

The takeaway

Residents of St. Louis and the surrounding region should be prepared to protect any tender vegetation from the risk of freezing temperatures on Monday night, as a sudden drop in temperature could pose a threat to newly planted or potted plants.