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  • Tonight

    May 6

    Partly cloudy Lo 18°
    more
  • Thu

    May 7

    An afternoon thunderstorm 27°Lo 18°
  • Fri

    May 8

    A p.m. t-storm in spots 27°Lo 18°
    more
  • Sat

    May 9

    A p.m. t-storm in spots 27°Lo 17°
    more
  • Sun

    May 10

    A p.m. t-storm in spots 27°Lo 18°
    more
< Previous 8 hours Next 8 hours >
  Thu
12pm
1pm 2pm 3pm 4pm 5pm 6pm 7pm
  12pm 1pm 2pm 3pm 4pm 5pm 6pm 7pm
Forecast
Partly Sunny
Partly Cloudy
T-storms
Partly Cloudy
Partly Cloudy
Partly Cloudy
Cloudy
T-storms
Temp (°C) 25° 24° 24° 23° 23° 22° 21° 21°
RealFeel® 35° 34° 31° 31° 28° 25° 22° 19°
Humidity 76% 78% 81% 84% 85% 85% 85% 84%
   
  12pm 1pm 2pm 3pm 4pm 5pm 6pm 7pm
Rain
 
8%
 
47%
 
51%
 
47%
 
15%
 
15%
 
19%
 
51%
Snow
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
Ice
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
   
  12pm 1pm 2pm 3pm 4pm 5pm 6pm 7pm
Wind (km/h) 6 SW 6 WSW 6 WSW 6 W 4 W 4 WSW 2 ESE 4 E
UV Index 12 11 8 6 3 1 0 0
Cloud Cover 40% 50% 70% 70% 71% 72% 73% 45%
Dew Point 21° 20° 21° 21° 20° 19° 19° 18°
Middle Grid line 30 C Middle Grid line 25 C Middle Grid line 20 C

Temperature History - May 7

more Historical Weather Data >
  Today Normal Record 5/7/2014
High 27° 28° N/A 29°
Low 18° 18° N/A 20°

Sunrise/Sunset

Sunrise / Sunset Illustration

Rises at 5:17 AM with 12:31 of sunlight, then sets at 5:48 PM

Moonrise/Moonset

Astronomy >
Moonrise / Moonset Illustration

Rises at 9:08 PM with 11:59 of moolight, then sets at 9:07 AM

San Marcos Weather Report

Volcanic Eruptions and Air Travel: What Happens When a Plane Flies Through an Ash Plume?

May 6, 2015; 5:54 PM ET

The 1,500 active volcanoes worldwide are creating a minefield for pilots who have to be on watch for volcanic ash clouds capable of causing major damage. more >