San Antonio typically has about a 50% chance of sunshine during the winter months and more than a 70% chance during the summer months. Skies are clear to partly cloudy more than 60% of the time and cloudy less than 40% of the time. Average temperatures range from the 50's in January to the mid to high 90's in July and August. While the summer is hot, with daily temperatures above 90 degrees over 80% of the time, extremely high temperatures (100 degrees and over) and rare. Mild weather prevails during the winter months, with temperatures below freezing occurring on an average of about 20 days per year.

Relative humidity is above 80% during the early morning hours most of the year, dropping to near 50% in the late afternoon. The normal annual rainfall is about 28 inches, with the heaviest amounts occurring during May and September. Measurable snow falls only once every three or four years.

Check out the following links for up-to-the-minute San Antonio weather reports:

• Heart of San Antonio
• The Weather Channel

Area physicians and the local Red Cross offer the following precautions to help you avoid heat exhaustion, dehydration, heatstroke and sunburn:

Drink Water: At least 8 to 15 8-ounce glasses of water or fruit juice (with a 50% water-juice concentration) during the day.

Wear Cool Fabrics: Natural fibers in cool colors work best. Wear a Wide-Brimmed Hat or Cap.

Avoid Dark Clothing: Dark clothing absorbs heat.

Pile on the Sunscreen: A minimum SPF of 15 at least twice a day.

Shade Your Eyes: UVA sunglasses.

Be Cautious: If you take antihistamines or diuretics, they deplete your body of fluids rapidly.

Avoid Excessive Alcohol or Caffeine: These cause you to lose bodily fluids, making you become dehydrated.

San Antonio Records:
Low: 0 degrees, January, 1949
High: 111, September 5, 2000