Half Moon Bay
Hourly
Confidence
Compare
โฑ๏ธs.
โšก๏ธkJ
Friday 07
Saturday 08
Sunday 09
Monday 10
Tuesday 11
Wednesday 12
Tap a forecast cell to explore conditions on the map.
Timezone: America/Los_Angeles
Wind: GFS (20251107 06z)
Waves: GFS WAVE (20251107 06z)

Half Moon Bay surf guide

Half Moon Bay is a popular surfing destination located along four miles of beach stretching from Princeton Harbor to the south. This crescent-shaped beach can catch waves from both the north and south at almost any time, making it a versatile spot for surfers. However, it's important to note that the surf here can often be unpredictable, and many days might not offer the best conditions. The area is known for its dynamic weather and shifting bottom contours, which can change from visit to visit.

The surf at Half Moon Bay generally varies with the swell. It's capable of handling wave sizes from about 3 feet (1 meter) to 8 feet (2.4 meters), depending on the conditions. The beach break can deliver some fun rides, especially when the swell is coming from the Southwest or West. Itโ€™s usually good for beginners, intermediates, and experts alike, with both right and left waves available. Ideal conditions occur when the wind is blowing from the Northeast, East, or East-Northeast, and the tide is around mid to high. However, you can also catch decent waves on low to mid tide. Most of the time, the surf can be pretty average, but with the right combination of small to mid-size swells and offshore winds, you might just find a sweet spot with some great waves.

Accessing the beach is straightforward, with roads off Highway 1 leading you to various entry points, including State Parks and dirt parking lots. The crowd factor is generally manageable; you can usually find a space to surf without dealing with too many other surfers around. Just keep in mind that the local vibe is mostly friendly but can be easily avoidable if you choose the right time to surf. The environment is mostly clean, making it a pleasant spot to spend the day catching some waves.

Surf reports and surf forecasts nearby Half Moon Bay

Francis Beach/Half Moon Bay State Beach
California, United States
Beach break
Fri 7
Sat 8
Sun 9
Mon 10
Tue 11
Wed 12
Thu 13
Fri 14
Sat 15
Sun 16
Mon 17
Tue 18
Half Moon Bay
California, United States
Beach break
Fri 7
Sat 8
Sun 9
Mon 10
Tue 11
Wed 12
Thu 13
Fri 14
Sat 15
Sun 16
Mon 17
Tue 18
Princeton Breakwater
California, United States
Unknown break
Fri 7
Sat 8
Sun 9
Mon 10
Tue 11
Wed 12
Thu 13
Fri 14
Sat 15
Sun 16
Mon 17
Tue 18
Princeton Jetty
California, United States
Jetty break
Fri 7
Sat 8
Sun 9
Mon 10
Tue 11
Wed 12
Thu 13
Fri 14
Sat 15
Sun 16
Mon 17
Tue 18
Mavericks
California, United States
Reef break
Fri 7
Sat 8
Sun 9
Mon 10
Tue 11
Wed 12
Thu 13
Fri 14
Sat 15
Sun 16
Mon 17
Tue 18
Confidence

Confidence tells you how much the weather models agree on the forecast.

  • High confidence: Models agree closely; forecast is reliable.
  • Medium confidence: Some disagreement; conditions may shift slightly.
  • Low confidence: Models diverge; treat forecast with caution.

We calculate the wind confidence by comparing wind speed, gust and direction from multiple models (like GFS, ECMWF, Arome, and Harmonie) and seeing how closely they match. For wave certainty we compare height, period and direction, also on multiple models. They are weighted, meaning that some models count more than others, depending on how good they are for a certain spot.

Readme

Welcome! If youโ€™re new to surf forecasting, check out this quick guide.

Forecast Table

The forecast table (the section on the page with all the numbers) is designed to pack as much information in the screen as possible. Although intimidating at first, it will help you make informed decisions about the waves faster, trust me :D. The table consists of roughly four sections, time and predictions, wind, waves, and tides:

๐Ÿ”ฎ Time and predictions section

Here we show the forecast thour and the overall surf quality prediction. This is determined based on the wave, wind and tide quality prediction. These individual predictions can be found on the forecast map.

๐Ÿ’จ Wind section

The first row on the table (with the ๐Ÿ’จ icon) shows wind speed, direction and gust. The more the wind speed the more aggressive the color (from blue, green, orange to red).

๐ŸŒŠ Wave section

The waves section consists of three rows, one for wave height and direction, one for period and one for wave energy. Our algorithm choices the "dominant wave". This is normally the first swell partition, but with heavy local storms it displays the wind waves. If that's the case, we display the numbers in italic and in gray.

๐ŸŒ’ Tide section

The tide section consists of a row with the actual heights per hour (measured at the half hour) and a table that displays the flow of the tide and the extremes (lows and highs).

Forecast map

The forecast map consists of arrows. These arrows represent all wave partitions (swell partitions and wind wave partition) and the wind. This allows you to see things like: a secondary swell or wind waves messes up the surf, or the wind is just a tick offshore so very surfable. Click a metric label in the bottom left to bring that arrow to the front โ€” handy when arrows overlap.

Forecast Cheat Sheet

Short on time? Focus on wave energy. Itโ€™s the best single metric to gauge how big and powerful the waves will be.

Click any table cell to jump to that forecast hour. The map will update with forecast arrows, so you can see if wind and swell direction are lining up.

Use the table sidebar to switch units for height and speed.

Log your surf sessions to compare forecasts with real sessions and sharpen future predictions.

Models and Updates

Surfnerd blends multiple global and local wind and swell models using advanced interpolation and spatial techniques to create an "ensemble" forecast. Forecasts are refreshed hourly.

Surf Predictions

Our AI-driven algorithm scores surf quality, shown by green, orange, and gray dots. Each forecast hour is rated for wind, swell, and tide quality, then combined into an overall score. Hereโ€™s the scale:

Perfect
Good
Average
Bad or No Data

Session logs also feed the algorithm โ€” the more you log, the smarter your forecasts get.

With Surfnerd, no more "you should have been here yesterday"

Share
Join Surfnerd for free
  • Save favorite spots
  • Set home spot
  • Log surf sessions
Sign up with AppleSign up with Google
Surfnerd Logo
Join Surfnerd+
Help keep Surfnerd independent and ad-free while we build the future of surf forecasting.
What you get today:
  • Surfnerd
    intelligent
    forecast
    (high accuracy!)
  • Shows
    confidence
    scores
    (more trust)
  • Compare
    models
    (more data)
  • Access all
    models
    (vs GFS only)
  • 1-hour
    forecast steps
    (vs 3-hour)
  • 12-day
    forecast range
    (vs 6-day)
"Great Forecasts. Nothing more, nothing less."
By purchasing the product, you accept the Terms of Use & acknowledge the Privacy policy.
Surfnerd for iOS: Faster loading, smoother experience.
Download on the App Store