Weather Tomorrow in San Marcos, TX
Heat AdvisoryUntil Aug 25, 6:00 AM
Heat Advisory issued August 24 at 12:26PM CDT until August 26 at 7:00PM CDT by NWS Austin/San Antonio TX
Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1.
Tuesday, August 25, 2026
Precip chance
1%
Wind
5-10 mph
Humidity
59%
Feels like
100–77°F
Data source: National Weather Service (NOAA) · Updated just now
Tomorrow by Hour
| Time | Temp | Condition | Rain % | Wind | ||
|---|---|---|---|---|---|---|
| 5 AM☽ | 84°F | Clear | 0% | 10 mph S | ||
| 6 AM☽ | 81°F | Mostly Clear | 0% | 10 mph S | ||
| 7 AM☽ | 79°F | Mostly Clear | 0% | 5 mph SSW | ||
| 8 AM☽ | 78°F | Mostly Clear | 0% | 5 mph SSW | ||
| 9 AM☽ | 77°F | Mostly Clear | 0% | 10 mph SSW | ||
| 10 AM☽ | 77°F | Partly Cloudy | 0% | 5 mph SSW | ||
| 11 AM | 76°F | Mostly Sunny | 0% | 5 mph SW | ||
| 12 PM | 75°F | Mostly Sunny | 0% | 5 mph SSW | ||
| 1 PM | 77°F | Mostly Sunny | 0% | 5 mph SW | ||
| 2 PM | 79°F | Sunny | 0% | 5 mph SW | ||
| 3 PM | 84°F | Sunny | 0% | 5 mph SSW | ||
| 4 PM | 88°F | Sunny | 0% | 5 mph SSW | ||
| 5 PM | 92°F | Sunny | 0% | 5 mph S | ||
| 6 PM | 95°F | Sunny | 1% | 5 mph S | ||
| 7 PM | 98°F | Sunny | 1% | 5 mph S | ||
| 8 PM | 100°F | Sunny | 1% | 5 mph S | ||
| 9 PM | 101°F | Sunny | 1% | 5 mph S | ||
| 10 PM | 102°F | Sunny | 1% | 5 mph SSE | ||
| 11 PM☽ | 102°F | Clear | 1% | 5 mph SSE | ||
| 12 AM☽ | 100°F | Clear | 0% | 5 mph S | ||
| 1 AM☽ | 97°F | Clear | 0% | 5 mph SSE | ||
| 2 AM☽ | 91°F | Clear | 0% | 5 mph SSE | ||
| 3 AM☽ | 88°F | Clear | 0% | 10 mph SSE | ||
| 4 AM☽ | 86°F | Clear | 0% | 10 mph S | ||
Precipitation Timeline
What to Wear Tomorrow
Extreme heat — stay cool and protected
Clothing
- • Lightest possible clothing
- • Wide-brim hat
- • UV-protective shirt if outdoors
Footwear
Breathable sandals
Accessories
- • Sunglasses
- • Sunscreen
Conditions
High: 102°F
Low: 75°F
Wind: 5-10 mph
Rain: 1%
Big temperature swing (75°F to 102°F) — dress in removable layers.
Best Time to Be Outside Tomorrow
Excellent conditions for outdoor activities (dry, comfortable temp, light wind, daylight)
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