While Big Bend generally has blue skies and warm days, the weather can change quickly and dramatically. You should be prepared for just about ANY type of weather at any time of the year. The following chart and links will help you plan your Big Bend visit. Chisos Basin Weather Stn.
Sunshine is abundant most of the year.
Infrequent and brief periods of cloudy weather may occur during the winter months. While snow is rare and generally light, occasional cold fronts can bring temperatures well below freezing. See a rare Big Bend snowfall Relative humidity is usually low. The rainy season extends from mid-June to October with locally heavy thunderstorms and some flash flooding. However, the water recedes rapidly and the rainy season can be a delightful time to visit the desert.