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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the Canada Edition Weather Desk. Data from Environment and Climate Change Canada and other national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
San Antonio is currently seeing conditions as shown in the live forecast above. For Canadians checking the weather in San Antonio, expect a humid subtropical climate with mild winters and very hot summers, making it a popular winter escape from prairie and Ontario cold snaps.
What is the typical weather in San Antonio for Canadian travellers?
San Antonio sits in south-central Texas, far from any moderating coastline, so summers are long and sweltering. Daytime highs from June through August regularly climb above 35°C, with high humidity pushing the humidex even higher. Winters are short and mild, with December and January highs near 17°C and overnight lows around 5°C. The city sees most of its rain in late spring and early autumn, often from quick thunderstorms. For those checking the weather in San Antonio tomorrow or planning a trip, the shoulder months of March, April, October and November offer the most comfortable conditions for walking the River Walk.
How does San Antonio’s weather compare to Canadian cities?
San Antonio’s winter warmth is a major draw for Canadians escaping the cold. While Calgary or Edmonton might see -20°C in January, San Antonio rarely dips below freezing. The trade-off is the intense summer heat, which surpasses even Toronto or Vancouver’s warmest days. The Canada weather hub shows that no major Canadian city matches San Antonio’s combination of heat and humidity from May through September. Travellers from Edmonton Weather or Ottawa Weather should prepare for a significant temperature shift if visiting in winter.
What is the best time to visit San Antonio for Canadians?
The best time is from late October to early April, when daytime highs are 18–24°C and humidity is low. This avoids both the summer heat and the peak tourist crowds, making it ideal for exploring the Alamo and River Walk.
Does San Antonio ever get snow?
Snow is very rare in San Antonio. The city averages less than 3 centimetres per year, and measurable snow occurs only once every few years. When it does fall, it usually melts within hours due to the mild daytime temperatures.
How accurate are the weather in San Antonio 10 day forecasts?
Ten-day forecasts for San Antonio are generally reliable for temperature trends but less so for precipitation timing, especially in spring and fall when thunderstorms can develop quickly. For the most up-to-date information, check the san antonio weather radar or the san antonio weather hourly forecast.