A Taste of April in February: Rex Block Brings Unseasonable Warmth to the Valley

A Taste of April in February: Rex Block Brings Unseasonable Warmth to the Valley

Phoenix residents waking up this Monday, February 2, 2026, might find themselves double-checking their calendars. As we enter the second month of the year, the desert metropolis is skipping the winter chill in favor of a significant warming trend that feels more like the middle of spring than early February.

The primary driver behind this unseasonable heat is a "Rex Block" weather pattern. This atmospheric phenomenon involves a strong high-pressure system centered over the Western United States, effectively locking out cooler air masses and moisture. As a result, the Valley of the Sun is experiencing temperatures nearly 10 to 14 degrees above the seasonal average, continuing a trend of record-breaking warmth that began in January.

Morning: A Crisp and Clear Start

The day begins with the signature clarity of the Sonoran Desert. Early morning commuters will encounter temperatures in the low 50s, specifically hovering around 51°F. While the air remains crisp before dawn, the lack of cloud cover means a rapid warm-up as soon as the sun clears the horizon around 7:23 AM. Humidity levels are expected to remain low, ensuring a dry and comfortable start for outdoor exercise or early commutes.

Afternoon: Peak Heat and Bright Skies

By midday, the high-pressure system will be in full effect. We are forecasting an afternoon high of 80°F, a temperature that pushes the boundaries of typical February weather. Under the influence of the Rex Block, the sky will remain a vivid, cloudless blue. The UV index is expected to be moderate, so those spending extended time outdoors during the lunch hour or at local parks should consider light sun protection. Winds will be light and variable, generally staying below 10 miles per hour, offering little relief from the direct solar heating.

Evening: The Desert Cool-Down

As the sun sets around 6:00 PM, the lack of atmospheric moisture will allow for a traditional desert cooling effect. Temperatures will drop steadily through the 60s during the early evening hours, settling into the mid-50s by late night. It will be an ideal evening for patio dining or evening walks, as conditions remain calm and dry across the metropolitan area.

Warnings and Advisories

• Precipitation: There is a 0% chance of rain today. The dry spell that defined much of January is persisting into the first week of February.
• Wind: No wind advisories are in place. Breezes will remain light throughout the day, posing no threat for dust storms or travel delays.
• Health Note: While 80°F is not extreme by Phoenix summer standards, the sudden jump to above-normal temperatures can be taxing. Stay hydrated and be mindful of the sun if you are planning strenuous outdoor activities.

Looking ahead, meteorological data indicates that these well-above-normal temperatures will persist throughout the week. Stay tuned to phoenix.news for further updates as we monitor this unusually warm start to the month.