Missouri–Illinois Weather Alert: St. Louis Storm Chances Rise to 60% Today With Thunderstorms Developing by Afternoon

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Missouri — A warm breeze sweeps through St. Louis, but the dry air carries a hidden risk before storms take over later today. The sky looks calm now, yet conditions are quietly shifting.

Temperatures are already near 69°F with gusty south winds and low humidity. That combination is raising fire danger across eastern Missouri and southwest Illinois. Even small sparks could spread quickly through dry vegetation.

That dry setup won’t last long. Moisture is rapidly increasing, and showers with thunderstorms begin developing later today. Rain chances climb to around 60%, especially into the afternoon and evening.

If you’re traveling on I-64, I-44, or I-55, be ready for changing conditions. Dry roads could turn slick fast as storms move in. Visibility may drop during heavier bursts.

Storm chances continue into Saturday, with scattered showers and a few thunderstorms redeveloping. It won’t rain all day, but expect interruptions to outdoor plans.

By Sunday, warmer air surges in. Highs reach near 80°F, and another round of showers and storms develops, especially later in the day. Meteorologists are watching this period closely as instability increases.

Plan ahead for Sunday travel. Conditions may shift quickly from mild to stormy, with lightning and brief downpours possible.

Early next week stays active. Monday brings another chance for thunderstorms, along with highs pushing into the mid-80s. The pattern remains unsettled through midweek, with repeated storm chances.

Looking ahead, above-normal warmth continues, signaling a strong push into spring—and even early summer-like conditions by late next week.

5-Day Outlook for St. Louis (Missouri–Illinois):
Saturday: Chance of showers and storms, high near 74°F
Sunday: Chance of storms, high near 80°F
Monday: Chance of storms, high near 86°F
Tuesday: Chance of storms, high near 88°F
Wednesday: Chance of storms, high near 84°F