Where is Belmont Slough?

Belmont Slough is a river in California.

What is the water temperature at Belmont Slough?

As of August 23, 2026, the water temperature at Belmont Slough in California is 70°F (21°C), measured by USGS gauge 11162765, 2.1 miles away.

Updated June 13, 2026

Belmont Slough

River

Comfortable for a swim today

Good to swim

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

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

See full conditions ↓Can I swim today? →

Good to swimGreat conditions today

Slough in California, United States

Interactive map not available

Comfortable for a swim today

Good to swim

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

Water temperature is 70°F, within the comfortable 70–86°F range. — USGS gauge 11162765, as of Aug 23, 11:45 AM gauge-local time
No official beach advisory posted (California Water Boards — FHAB Reports checked).

Water temp

70°F

21°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 (2.1 mi away), as of Aug 23, 11:45 AM gauge-local time.

Live map near here →

Weather at Belmont Slough

H: 87° L: 55°

Overcast

81°

Feels like 82°

Precipitation

15%

Humidity

49%

Wind

6 mph

UV Index

8.1

Water Conditions:

🏊Perfect for swimming🧴High UV - use sunscreen

12 AM

59°

3 AM

57°

6 AM

55°

9 AM

66°

12 PM

75°

3 PM

87°

6 PM

81°

9 PM

68°

Pack smarter for Belmont 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 Belmont Slough?: Belmont Slough is a river in California.
What is the water temperature at Belmont Slough?: As of August 23, 2026, the water temperature at Belmont Slough in California is 70°F (21°C), measured by USGS gauge 11162765, 2.1 miles away.
Can you swim at Belmont Slough?: Comfortable for a swim today: water temperature is 70°F, within the comfortable 70–86°F range. Checked August 23, 2026.

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Location & Contact

California

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