Forecast Details for San Juan, TX

Recent Locations: San Juan, TX

Current Alerts for San Juan, TX: Special Weather Statement

Tonight: Mostly clear, with a low around 78. Southeast wind 7 to 13 mph, with gusts as high as 22 mph.

Saturday: Sunny and hot, with a high near 100. Heat index values as high as 107. South southeast wind 6 to 10 mph.

Saturday Night: Mostly clear, with a low around 78. Southeast wind 6 to 13 mph, with gusts as high as 22 mph.

Sunday: Sunny and hot, with a high near 100. Heat index values as high as 107. Southeast wind 6 to 10 mph.

Sunday Night: Mostly clear, with a low around 78. East southeast wind 5 to 13 mph, with gusts as high as 22 mph.

Labor Day: A 30 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 99. East southeast wind 3 to 8 mph.

Monday Night: A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 78. East wind 5 to 10 mph becoming light and variable after midnight.

Tuesday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Mostly sunny, with a high near 96. North northeast wind 3 to 7 mph. Chance of precipitation is 60%.

Tuesday Night: A chance of showers and thunderstorms before 1am, then a slight chance of showers. Mostly cloudy, with a low around 77. East wind 5 to 8 mph becoming light and variable in the evening. Chance of precipitation is 30%.

Wednesday: A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 98. Light and variable wind becoming north northeast 5 to 8 mph in the morning. Chance of precipitation is 30%.

Wednesday Night: Partly cloudy, with a low around 75. Northeast wind 5 to 8 mph becoming light and variable after midnight.

Thursday: A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 97.

Thursday Night: Partly cloudy, with a low around 75.

Friday: A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 95.

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Current U.S. National Radar--Current

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National Weather Forecast--Current

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National Weather Forecast for Tomorrow

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North America Water Vapor (Moisture)

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Weather Topic: What is Condensation?

Home - Education - Precipitation - Condensation

Next Topic: Contrails

Condensation is the process which creates clouds, and therefore it is a crucial process in the water cycle. Condensation is the change of matter from a state of gas into a state of liquid, and it happens because water molecules release heat into the atmosphere and become organized into a more closely packed structure, what we might see as water droplets.

Water is always present in the air around us as a vapor, but it's too small for us to see. When water undergoes the process of condensation it becomes organized into visible water droplets. You've probably seen condensation happen before on the surface of a cold drink!

Next Topic: Contrails

Weather Topic: What are Cumulonimbus Clouds?

Home - Education - Cloud Types - Cumulonimbus Clouds

Cumulonimbus Clouds Next Topic: Cumulus Clouds

The final form taken by a growing cumulus cloud is the cumulonimbus cloud, which is very tall and dense. The tower of a cumulonimbus cloud can soar 23 km into the atmosphere, although most commonly they stop growing at an altitude of 6 km.

Even small cumulonimbus clouds appear very large in comparison to other cloud types. They can signal the approach of stormy weather, such as thunderstorms or blizzards.

Next Topic: Cumulus Clouds