Cloudy Skies and Unseasonable Warmth: St. Louis Tuesday Weather Outlook

Morning: A Crisp and Cloudy Start

St. Louis residents waking up this Tuesday, February 17, 2026, will find themselves under a thick blanket of clouds. The early morning hours are starting off with a temperature of approximately 43°F. While the air carries a chill typical of late winter, it is notably milder than the freezing temperatures often seen during this time of year. Humidity levels are currently hovering around 67%, making the air feel slightly damp despite the lack of immediate precipitation. Commuters can expect dry roads, though visibility may be slightly reduced under the heavy overcast conditions. A light breeze from the south is expected to persist through the morning, preventing any significant frost from forming on windshields.

Afternoon: Unseasonable Warmth Peaks

As we move into the afternoon, the Gateway City is set to experience a significant temperature surge. Forecasters predict the high will reach a comfortable 60°F. This is considerably warmer than the climatological normal high of 46°F for mid-February. Although the sun will remain largely hidden behind cloud cover throughout the day, the influx of southerly air will keep the atmosphere feeling quite spring-like. There is a minimal 10% chance of light rain during the afternoon hours, so while a full-sized umbrella might not be necessary, a light water-resistant jacket would be a wise choice for those walking between downtown buildings. The relative humidity is expected to fluctuate between 67% and 76%, maintaining a consistent moisture profile throughout the day.

Evening and Overnight: Cooling Under Partial Clouds

As the sun sets at approximately 5:41 PM, temperatures will begin a slow descent. The evening forecast calls for a transition from fully cloudy to partly cloudy skies. Temperatures will likely settle back down toward the low 40s, with an overnight low of 43°F. The chance of precipitation increases slightly to 15% during the night, though no significant accumulation or thunderstorm activity is expected. Wind speeds will remain gentle, lacking any harsh gusts that would require wind advisories. Compared to the record low for this date—a bone-chilling -6°F set back in 1903—tonight’s weather remains exceptionally temperate for the season.

Alerts and Commuter Impact

Currently, there are no active wind or rain warnings for the St. Louis metropolitan area. The 10-day outlook suggests that this mild trend will continue into tomorrow before a potential cooling period later in the week. For today, the primary weather concern for residents will be the overcast skies, which may affect those prone to seasonal mood changes. Drivers should be aware that while the 10% to 15% chance of rain is low, any brief mist could create slick spots on high-traffic areas like I-64 or I-44. Overall, it is a day to enjoy the break from the usual February freeze, even if the sunshine is lacking.