Half Moon Bay surfForecast / Washington / USA

information circle12 Day Weather and Surf, issued 9 am Sunday 11 Jan 2026 PST
Forecast update in hr  min  s Forecast update imminent
Half Moon Bay surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Half Moon Bay sea temperature is
9.8° C
(Which is slightly warmer than usual)


Best Forecast Surf Conditions for Half Moon Bay this week:

The surf forecast for Half Moon Bay over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Sunday (Jan 11) at 4PM. The primary swell is predicted to be 4.5m and 17s period with a secondary swell of 4.5m and 17s. The wind is predicted to be cross-offshore as the swell arrives.

The most powerful waves expected at Half Moon Bay in the next 12 days are 4.5m 17s and forecast to arrive on Sunday (Jan 11) at 4PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 3s period and expected on Thursday (Jan 15) at 1PM.

Wave TypeTime (PST) & Date Wave Height & Period
Next good surf (1 star+) 4PM (Sun 11th Jan)15ft (4.5m) 17s
Best Surf 4PM (Sun 11th Jan)15ft (4.5m) 17s
Most Powerful 4PM (Sun 11th Jan)15ft (4.5m) 17s

Table - best surf conditions forecast for Half Moon Bay over the next 12 days.

Updates in  hr  min  s Forecast update imminent

Short Range Forecast Heavy rain (total 20mm), heaviest during Sun afternoon. Very mild (max 14°C on Mon night, min 9°C on Sun morning). Winds decreasing (strong winds from the S on Sun afternoon, calm by Tue night).

Days 3-6 Weather Summary Mostly dry. Very mild (max 11°C on Wed morning, min 7°C on Wed night). Wind will be generally light.

Sunday
11
Monday
12
Tuesday
13
Wednesday
14
Thursday
15
Friday
16
Saturday
17
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
Rating
(10 max)
!
!
!
!
!
4
4
3
4
5
2
3
2
2
0
0
0
1
2
3
3
Swell
Height Map
Wave Height (m) & direction (?)
3.5
SW
4.5
WSW
4
WSW
4
WSW
3.5
WSW
3
WSW
2.5
WSW
2.3
WSW
2
WSW
3
WSW
3
WSW
1.9
WSW
1.3
W
1.2
W
1
W
0.9
W
0.8
W
0.5
W
0.8
W
1.2
W
1.4
WSW
Period(s) (?)121716141413121212161413131212121019161513
Wave
Graph
(?)Metric surfscale
Energy kJ (?)3114119317693688046712618187514851072424730911217534400266216141186339644722
Wind
(km/h)
35
S
45
S
40
S
35
S
25
S
5
SE
10
ENE
5
NNW
0
NE
0
S
10
NW
10
NE
20
ENE
15
NNE
30
ENE
25
ENE
20
ENE
20
ENE
15
E
5
S
10
E
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
off
cross-
off
cross-
off
cross-
off
cross-
off
offcross-
off
onglassglassoncrosscross-
off
crosscross-
off
cross-
off
cross-
off
cross-
off
cross-
off
glasscross-
off
High Tide
/ height (m)
7:27PM
1.86
7:15AM
2.72
8:51PM
1.87
8:06AM
2.73
10:06PM
1.98
8:58AM
2.77
11:02PM
2.12
9:49AM
2.84
11:45PM
2.25
10:36AM
2.91
12:23AM
2.36
11:21AM
2.97
12:58AM
2.45
Low Tide
/ height (m)
1:14PM
0.70
12:35AM
1.22
2:17PM
0.59
1:37AM
1.41
3:14PM
0.47
2:40AM
1.51
4:05PM
0.33
3:39AM
1.52
4:50PM
0.20
4:31AM
1.48
5:30PM
0.07
5:17AM
1.39
6:09PM
-0.04
Sunday
11
Monday
12
Tuesday
13
Wednesday
14
Thursday
15
Friday
16
Saturday
17
Sunrise7:58--7:58--7:58--7:58--7:56--7:56--7:56--
Sunset-4:49--4:50--4:51--4:52--4:53--4:54--4:57-
light rain
mod rain
mod rain
light rain
part cloud
part cloud
part cloud
clear
clear
part cloud
part cloud
clear
clear
part cloud
clear
clear
clear
clear
clear
clear
clear
Rain (mm)
5861-----------------
Temp. °C991111111413141311111099810111091110
Feels °C (?)202561211131210108562454696
  • Map Icons:
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  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
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Information about the Half Moon Bay Surf forecast

The above surf forecast table for Half Moon Bay provides essential information for determining whether the surfing conditions will be good over the next 12 days. A general guide to surfing at Half Moon Bay can be found by selecting the local surf guide option on the grey menu. Our Half Moon Bay surf forecast is unique since it includes wave energy (power) that defines the real feel of the surf rather than just the height or the period. If you surf the same spot (Half Moon Bay) regularly then make a mental note of the wave energy from the surf forecast table each time you go. Very soon you may start to choose your surf days based on the wave energy alone combined with our forecast of favourable offshore wind conditions. Our star ratings will help here and of course you will also find the usual wave height and period predictions on our surf forecasts as well as a full break down of the swell components under our advanced users option (to reveal that, click the little Einstein character under the tide times).

Further information to help with frequently asked questions about our surf forecast for Half Moon Bay may be found under the help tab on the top menu and also by moving your mouse over the question marks on the surf forecast table itself. Please always bear in mind that the forecast is for near-shore open water and local factors at each surf break influence the actual breaking wave height, such as the beach / reef profile, water depths offshore and shelter.

Are you planning a vacation in Washington State? If you are looking for accommodation near Half Moon Bay, camping, hotels and condos and appartments in Washington State, consider staying in Aberdeen which is 25 km (16 miles) away. Other places in and around Washington State where you can find information about places to rent, and car hire include Astoria which is 83 km (52 miles) away, Centralia and Olympia.

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