# Warner Hot Spring, California

Warner Hot Spring in California. 138°F (59°C). Roadside. San Diego County.

- Page: https://www.soakingsprings.com/hot-springs/california/warner-hot-spring
- Source: Soaking Springs, researched and maintained by Armen Suny
- Updated: 2026-09-14

## Can you soak at Warner Hot Spring?

Only once it cools. The water leaves the ground at 138°F, hotter than any hot tub. You can drive right up to it. We haven't confirmed whether it has a pool or charges a fee.

## Key facts

| Fact | Value |
|---|---|
| Source water temperature | 138°F (59°C) (USGS record; developed pools are often cooled) |
| pH | 6.6 (Slightly Acidic) |
| Total dissolved solids | 355 mg/L |
| Elevation | 3,170 ft |
| Access | Roadside, 11 ft from the nearest road |
| County | San Diego County |
| Nearest town | Julian |
| Coordinates | 33.28400, -116.63100 |
| Best months to soak | December, January, February (largest gap between water and average air temperature) |
| Nearest campground | Indian Flats Campground, 4.8 mi |

## About Warner Hot Spring

Warner Hot Spring sits in San Diego County, roughly fifteen miles from Julian. The water is hot, close to the point where a soak starts to hurt, and too hot to lower yourself into at the source. The file has no entry for public access and none for land ownership. OpenStreetMap knows it by the same name, and there is a USGS site number attached.

The spring is nearly on the pavement, eleven feet from the road by the record, though which road is not named in the file. Elevation runs a little over three thousand feet, so this is foothill country with real winters by Southern California standards: a few inches of snow in a typical year and a modest rain total. No land owner or unit is recorded, so you cannot assume it is public ground.

Best months per the record: December through February. Roadside, no walk. Indian Flats Campground, around five miles off, is the closest camping listed. The temperature is high enough that you should test the water before a hand goes in, and do not expect to sit in it where it surfaces. The water figures on the page go back to a December 1964 sample, so treat them as historical. Confirm ownership and access before you go.

## Water chemistry

Lab sample from 1964-12-03 (Water Quality Portal).

| Measure | Value |
|---|---|
| pH | 6.6 |
| Total dissolved solids | 355 mg/L |
| Calcium | 2 mg/L |
| Magnesium | 0 mg/L |
| Sodium | 95 mg/L |
| Sulfate | 137 mg/L |
| Chloride | 25 mg/L |

## Nearby

- Nearest city page: [Hot springs near Anza](https://www.soakingsprings.com/hot-springs/near/california/anza), 19 mi away
- State page: [Hot springs in California](https://www.soakingsprings.com/hot-springs/california)
- [Unnamed thermal spring, CA](https://www.soakingsprings.com/hot-springs/california/unnamed-spring-riverside-county-1): Warm, pH 9.7, TDS 224 mg/L, Roadside, near Anza, Riverside County
- [Agua Tibia Spring, CA](https://www.soakingsprings.com/hot-springs/california/agua-tibia-spring): 92°F source, Roadside, near Rainbow, San Diego County
- [Vallecitos Spring, CA](https://www.soakingsprings.com/hot-springs/california/vallecitos-spring): 79°F source, Short Walk, near Pine Valley, San Diego County
- [Agua Caliente Springs, CA](https://www.soakingsprings.com/hot-springs/california/agua-caliente-springs-2): 101°F source, Short Walk, near Pine Valley, San Diego County
- [Fish Springs, CA](https://www.soakingsprings.com/hot-springs/california/fish-springs-1): 90°F source, Roadside, near Desert Shores, Imperial County
- [Murrietta Hot Springs, CA](https://www.soakingsprings.com/hot-springs/california/murrietta-hot-springs): 132°F source, pH 9.1, TDS 700 mg/L, Roadside, near Murrieta Hot Springs, Riverside County

## Questions

**What is the water temperature at Warner Hot Spring?**
Warner Hot Spring has a water temperature of 138°F (59°C). This is considered a hot spring, well above body temperature.

**Where is Warner Hot Spring located?**
Warner Hot Spring is located in San Diego County, California at 3,170 feet elevation, near Julian. Coordinates: 33.2840°N, 116.6310°W.

**How do I get to Warner Hot Spring?**
Warner Hot Spring has Roadside road access (11 ft from the road).

**Can I camp near Warner Hot Spring?**
Yes, Indian Flats Campground is located nearby (4.8 miles away).

**What minerals are in the water at Warner Hot Spring?**
Water chemistry analysis shows the presence of pH, Total Dissolved Solids, Calcium, Magnesium, Sodium, Sulfate, Chloride. The pH is 6.6 (slightly acidic). Total dissolved solids measure 355 mg/L.

**Is it safe to soak at Warner Hot Spring?**
With care. At 138°F Warner Hot Spring is hot enough to need short sessions, fifteen to twenty minutes, and plenty of water. Enter slowly and get out if you feel light-headed.

## Sources

- USGS thermal springs records, Water Quality Portal lab analyses, OpenStreetMap, Wikipedia/Wikidata, NOAA climate normals