St. Louis, MO — Missouri residents preparing for Labor Day weekend activities should brace for a prolonged stretch of intense heat that will dominate the holiday landscape. While the region transitions into the holiday, the stubborn heat remains the primary story for anyone heading out to parks, parades, or backyard cookouts.

Saturday kicks off the holiday window with mostly sunny skies and a high near 99 degrees. Travelers heading across the region on I-70 or I-64 should remain mindful of the persistent heat, which can impact vehicle performance and increase fatigue during long road trips. With the heat index remaining high, ensure that vehicles are serviced and carry plenty of water for passengers.

By Sunday, conditions stay largely consistent as high pressure keeps the region locked in a summer-like pattern. Temperatures will peak at 96 degrees under full sunshine. If you are planning an outdoor celebration, aim to schedule events during the morning hours before the midday peak. Airport travelers through Lambert International should prepare for potential ground delays as extreme heat often impacts tarmac operations.

The Labor Day holiday itself will see sunshine continue with a high of 94 degrees. While this is a slight dip from earlier in the weekend, the heat remains well above typical levels for early September. Whether you are navigating holiday traffic or hosting a final summer barbecue, stay hydrated and keep high-heat protocols in mind throughout the entire three-day stretch.

Conditions will remain stable through Monday evening, with clear skies providing a calm end to the holiday weekend. Are you heading out of town or hosting friends this Labor Day weekend? Tell us what conditions you are seeing in your neighborhood.

Five-Day Forecast:

• Thursday: Sunny, 100/79
• Friday: Sunny, 100/79
• Saturday: Mostly Sunny, 99/76
• Sunday: Sunny, 96/71
• Monday: Sunny, 94/72

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