San Marcos, Texas Weather
Cicadas claim the scorching afternoon. Day 14 of summer. Read this microseason across nine climate regions →
San Marcos weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Overcast——97°77°—
- SundayJul 5Overcast——98°75°+1°
- MondayJul 6Overcast——100°74°+2°
- TuesdayJul 7Light Drizzle——95°75°-5°
- WednesdayJul 8Overcast——101°75°+6°
- ThursdayJul 9Clear——102°73°+1°
- FridayJul 10Mostly Clear——102°72°0°
AQI 26 (Good), driven by PM2.5. AQI down 6 over the last 6 hours (gradual decline).
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
Trends
Seven days of AQI and PM2.5.
Hourly air-quality data from the Copernicus Atmosphere Monitoring Service, charted across the past and next several days. Dashed lines mark the AQI breakpoints at 50 (Good → Moderate) and 100 (Moderate → Unhealthy for Sensitive Groups).
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
- Moonrise
- 11:14 PM
- Moonset
- 10:49 AM
- In sign
- ♓︎ Pisces
Cicadas claim the scorching afternoon
San Marcos at a glance
- Today vs. normal: 4°F below the seasonal normal for this latitude
- Last frost: February 14 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 78666
15-Day Forecast — San Marcos
- Sat97°77°0%
- Sun98°75°0%
- Mon100°74°8%
- Tue95°75°8%
- Wed101°75°4%
- Thu102°73°0%
- Fri102°72°7%
- Sat104°72°15%
- Sun104°73°13%
- Mon103°74°9%
- Tue104°72°8%
- Wed106°71°13%
- Thu106°72°14%
- Fri106°73°19%
- Sat109°74°16%
Forecast data from Open-Meteo (CC BY 4.0).
Live wind & temperature near San Marcos
Right now in the garden
Peak growing season
As of July 4, the growing season is at its peak — frost is months away. Continue succession-planting beans and summer squash. Start fall brassicas (broccoli, cabbage, kale) from seed indoors for transplanting in late summer.
SPC Convective Outlook
Storm Prediction Center — San Marcos
SPC includes San Marcos in the general thunderstorm area day after tomorrow — no severe risk, but storms are possible.
- TODAYNONENo severe risk
- TOMORROWNONENo severe risk
- DAY 3TSTMGeneral Thunderstorms
Thunderstorms possible. Not severe, but capable of producing lightning and brief heavy rain.
Source: NOAA / NWS Storm Prediction Center categorical convective outlook. Outlooks are re-issued multiple times per day; this page reflects the most recent SPC polygons covering the city’s coordinates.
ZIP codes in San Marcos
- 78666
- 78656
- 78667