Frosty Valleys and Golden Sunsets: A Sharp Sunday Chill for San Diego

A Crisp Sunday Start

San Diego residents are waking up to a crisp and clear Sunday this February 22, 2026. While the typical Southern California winter often feels like an eternal spring, today’s atmosphere serves as a reminder that February can still bite. Verified meteorological data indicates that a cool air mass has settled over the region, bringing bright, clear skies paired with shivering start-of-day temperatures that are well below the seasonal norm.

Brisk Morning Conditions

The morning hours are dominated by a distinct chill, with coastal temperatures starting in the low 50s and inland valleys dipping into the high 40s. The most significant weather story for the early hours is the presence of patchy frost. Local predictions have highlighted the potential for frost across the San Diego County valleys, particularly in low-lying areas where clear overnight skies allowed heat to escape the surface rapidly. Residents in communities like Escondido, El Cajon, and Poway are advised to protect sensitive tropical plants and ensure outdoor pets have warm shelter until the sun begins to warm the ground after 9:00 AM.

Sunny and Temperate Afternoons

As the morning frost thaws, the afternoon promises to be quintessential San Diego. The sun will be out in full force, providing a much-needed boost to the mercury. High temperatures are expected to reach a comfortable range of 67°F to 70°F across the metropolitan area. Humidity levels will remain relatively low, sitting at approximately 55%, which will make the afternoon feel pleasant and dry. For those heading to the coastline, sea temperatures are currently averaging 57°F, meaning a heavy wetsuit is still a requirement for any Sunday surfers. Winds are expected to remain light and manageable, mostly coming from the west at roughly 5 to 10 knots, offering nothing more than a gentle breeze for those enjoying the city's parks and outdoor dining.

Clear Evenings and a Look Ahead

The evening will see a return to cooler conditions almost immediately after sunset. Temperatures are projected to descend back into the low 50s by late evening. Fortunately, the skies will remain clear, providing excellent visibility for stargazing. While today remains on the cooler side of the February average, a significant warming trend is on the horizon. High temperatures for Monday are expected to jump into the 80s for many inland valleys, making today’s crisp air a brief, refreshing departure before a mid-winter heat spike takes hold early next week.

Summary of Daily Alerts

• Frost Notice: Patchy frost is possible in inland valleys until mid-morning.
• Precipitation: There is a negligible 3% to 5% chance of rain; dry conditions will prevail all day.
• Wind/Rain Warnings: No active wind or flood warnings are in effect for the San Diego region today.