⚠️ Thermal Stress Warning: Water temps exceed 68°F. Catch-and-release mortality is high.

San Joaquin River

Near Vernalis USGS: 11303500 Provisional Data Last Updated: May 11, 09:00 PM Pacific Daylight Time

Current Flow

1,240 cfs
Flow Extremely Low Flow Is Steady Below 25th Percentile

Water Temp

73.8 °F
Danger (68°F+)

Expected Weather

Temp --°F
Wind -- mph
Rain Chance --%
Pressure -- hPa

Location

System Insights

  • Very low. Rocks exposed; difficult navigation for boats.

  • Water temperature is 74°F — above 68°F, the upper threshold typically considered suitable for cold-water species habitat.

  • Flow is running below average with no significant precipitation forecast over the next 3 days.

  • Flow has fallen from within the 25th–75th percentile range to below the 25th percentile over the past 7 days (1,970 → 1,240 cfs).

Verify access, permits, and local conditions before entering any waterway.

Today's Weather

Forecast Details

Morning

At 6 AM: 55°F and Partly Cloudy, wind W at 3 mph. By 10 AM: 74°F and Mainly Clear, wind N at 3 mph.

Afternoon/Evening

At 2 PM: 91°F and Clear, wind N at 5 mph. By 6 PM: 93°F and Mainly Clear, wind NW at 9 mph.

Overnight

Dropping from 78°F at 10 PM to 63°F by 4 AM. Conditions Clear with wind NE at 4 mph.

3-Day Outlook

🌘 Waning Crescent

Today, May 11

☁️

95° / 55°

Chance of Rain: 0%
🌅 5:58 AM 🌇 8:04 PM

Tuesday, May 12

☁️

90° / 60°

Chance of Rain: 1%
🌅 5:57 AM 🌇 8:05 PM

Wednesday, May 13

☁️

78° / 56°

Chance of Rain: 1%
🌅 5:56 AM 🌇 8:06 PM

Flow Trend & 7-Day Forecast

Source: USGS
Current (CFS)
7-Day Forecast
Historical Median
Normal Range

7-Day Water Temperature (°F)

Source: USGS
Current (°F)
Historical Median

Nearby Gauges