Spring Sneak Peek: St. Louis Soars into the 70s This Wednesday

An Unseasonable February Warm-Up

St. Louis residents waking up this Wednesday, February 18, 2026, might be forgiven for checking their calendars twice. In a dramatic departure from the typical mid-winter chill, the Gateway City is experiencing a surge of unseasonable warmth more reminiscent of late April than mid-February. Temperatures are expected to climb nearly 20 degrees above the seasonal average, offering a temporary reprieve from the winter season.

Morning: A Mild Start

The day began with exceptionally mild conditions, as temperatures hovered in the mid-50s during the early morning hours. While some lingering clouds were present at daybreak, the morning commute felt distinctly soft and humid. As the sun rose at 6:47 a.m., southwesterly breezes began to pick up, signaling the arrival of a much warmer air mass that will define the rest of the day.

Afternoon: Peak Sun and Breezy Conditions

Expect plenty of sunshine throughout the afternoon hours as cloud cover thins out completely. The mercury is forecast to hit a peak of approximately 72°F. This high-pressure system brings not only warmth but also breezy conditions. Southwest winds will sustain speeds between 10 and 15 mph, with occasional gusts reaching up to 25 or 32 mph. While there are no active rain or wind warnings for the St. Louis metropolitan area today, the gusty winds may be noticeable for high-profile vehicles on open stretches of I-64 and I-44.

Evening and Night: Clouds Return

As the sun sets at 5:42 p.m., the record-challenging warmth will slowly begin to recede, though temperatures will remain comfortable through the evening. By late tonight, cloud cover is expected to increase once again. Forecasters are monitoring a slight 20% chance of isolated showers developing after midnight, with overnight lows settling around a mild 51°F.

Looking Ahead

While today feels like a total escape from winter, it is a brief window of warmth. The UV index remains at a moderate level 3, so those spending extended time outdoors should still be mindful of sun exposure. This "spring tease" is expected to last through Thursday afternoon before a more active weather pattern brings a return to cooler, more traditional February conditions by the weekend.

• High Temperature: 72°F
• Low Temperature: 51°F
• Wind: SW 10-15 mph, gusts up to 32 mph
• Precipitation: 0% day / 20% late night
• Humidity: Approximately 49%