Where is Phelps Slough?

Phelps Slough is a river in California.

What is the water temperature at Phelps Slough?

As of August 22, 2026, the water temperature at Phelps Slough in California is 71°F (22°C), measured by USGS gauge 11162765, 4.4 miles away.

Updated June 13, 2026

Phelps Slough

River

Comfortable for a swim today

Good to swim

Comfortable for a swim today: water temperature is 71°F, within the comfortable 70–86°F range.

Water temperature is 71°F, within the comfortable 70–86°F range.
No official beach advisory posted (California Water Boards — FHAB Reports checked).

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Good to swimGreat conditions today

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Comfortable for a swim today

Good to swim

Comfortable for a swim today: water temperature is 71°F, within the comfortable 70–86°F range.

Water temperature is 71°F, within the comfortable 70–86°F range. — USGS gauge 11162765, as of Aug 22, 10:45 AM gauge-local time
No official beach advisory posted (California Water Boards — FHAB Reports checked).

Water temp

71°F

22°C

Official advisories

Checked against California Water Boards — FHAB Reports — no advisory posted.

Live, provisional data from USGS gauge SF BAY A SAN MATEO BRIDGE NR FOSTER CITY CA (4.4 mi away), as of Aug 22, 10:45 AM gauge-local time.

Live map near here →

Weather at Phelps Slough

H: 81° L: 54°

Sunny

77°

Feels like 77°

Precipitation

10%

Humidity

53%

Wind

7 mph

UV Index

Water Conditions:

🏊Perfect for swimming🧴High UV - use sunscreen

12 AM

59°

3 AM

56°

6 AM

54°

9 AM

64°

12 PM

77°

3 PM

80°

6 PM

75°

9 PM

59°

Pack smarter for Phelps Slough

Useful gear categories for this kind of water spot. These links open Amazon search results so you can compare current options.

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River Water ShoesGood grip helps on slick rocks, banks, and shallow crossings.

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River TubeUseful to compare if tubing is part of the plan.

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Floating Dry BagKeeps valuables together around current and splash.

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Polarized SunglassesCuts glare for fishing, paddling, and reading shallow water.

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Frequently asked questions

Where is Phelps Slough?: Phelps Slough is a river in California.
What is the water temperature at Phelps Slough?: As of August 22, 2026, the water temperature at Phelps Slough in California is 71°F (22°C), measured by USGS gauge 11162765, 4.4 miles away.
Can you swim at Phelps Slough?: Comfortable for a swim today: water temperature is 71°F, within the comfortable 70–86°F range. Checked August 22, 2026.

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Location & Contact

California

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