Arctic Blast Brings Coldest Night to San Antonio

A short-lived warming streak is expected to be followed by another arctic blast in San Antonio, as well as the arrival of rain early next week. The city is bracing for the coldest night of the arctic blast overnight tonight, with temperatures potentially tying a record set back in 1930. San Antonio has already broken a record on MLK Day when the San Antonio International Airport reached 29 degrees, the coldest high temperature since 2007.

Despite the upcoming warm-up in the next 48 hours, another arctic blast is set to hit the city in time for the weekend, followed by rain early next week. The weather patterns have been quite wild to kick off the year, keeping San Antonians on their toes. Here’s what residents can expect over the next seven days:

Tuesday will see a high of 36 degrees and a low of 18 degrees, with a Hard Freeze Warning and Wind Chill Advisory in effect overnight into Wednesday morning. While wind chills won’t be as severe as the previous night, temperatures will still drop significantly, making it the coldest night of this arctic blast. By 7 p.m. on Tuesday, temperatures will have already fallen below freezing, reaching 30 degrees, and they will continue to drop overnight, reaching the teens and around 15 degrees by Wednesday morning. Areas further north, like Boerne, can expect temperatures as low as 8 degrees.

San Antonians are urged to take necessary precautions to protect against the extreme cold. This frigid weather is caused by radiational cooling, where calm winds and clear skies allow the ground to lose more heat, resulting in lower temperatures than in the past couple of nights.

Wednesday will bring the coldest morning, with temperatures around 15 degrees and even single digits in some northern areas. Anyone spending time outdoors is at risk of frostbite and hypothermia if not properly dressed. It is important to dress in layers and cover any exposed skin to stay warm during these below-freezing conditions. The good news is that this will be the last day of dangerously cold temperatures, as a southerly wind returns in the afternoon, bringing temperatures above freezing and reaching the 40s. Additionally, temperatures dropping into the teens overnight will no longer be a concern for the next 48 hours, as a significant warm-up is expected on Thursday.

On Thursday, San Antonians can look forward to spring-like temperatures near 70 degrees, providing a chance to enjoy the outdoors. However, they shouldn’t get too comfortable, as another blast of cold arctic air will push through in the evening, leading to dangerous wind chills on Friday morning.

Friday will see breezy winds, gusting at 30-35 mph in the afternoon, keeping temperatures in the 40s for the rest of the day. Overnight, temperatures will drop into the 20s, raising the possibility of a hard freeze until Saturday morning.

Over the weekend, morning temperatures will hover around 25 degrees, accompanied by a north wind of 15-20 mph. San Antonians will still need their heavy jackets, as afternoon temperatures on Saturday and Sunday will remain in the 40s. Clouds will move in on Sunday, as an upper-level system brings more moisture and the potential for heavy rain starting next week.

On Monday, San Antonians can expect rain and possible storm activity, which may continue through Tuesday. The duration of the arctic air will be closely monitored to determine if temperatures stay above freezing.

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