Half Moon Bay surfForecast / Washington / USA

information circle12 Day Weather and Surf, issued 9 pm Friday 09 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
9.9° 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 Saturday (Jan 10) at 4AM. The primary swell is predicted to be 2.3m and 11s period. The wind is predicted to be offshore as the swell arrives.

The most powerful waves expected at Half Moon Bay in the next 12 days are 4.0m 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 Friday (Jan 16) at 7AM.

Wave TypeTime (PST) & Date Wave Height & Period
Next good surf (1 star+) 4AM (Sat 10th Jan)7.5ft (2.3m) 11s
Best Surf 1PM (Sat 10th Jan)11ft (3.5m) 14s
Most Powerful 4PM (Sun 11th Jan)13ft (4.0m) 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 61mm), heaviest during Sat night. Very mild (max 11°C on Sun night, min 7°C on Sat night). Winds decreasing (strong winds from the S on Sun night, light winds from the SE by Mon afternoon).

Days 3-6 Weather Summary Mostly dry. Very mild (max 15°C on Tue afternoon, min 6°C on Thu afternoon). Wind will be generally light.

Saturday
10
Sunday
11
Monday
12
Tuesday
13
Wednesday
14
Thursday
15
Fri
16
NightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPM
Rating
(10 max)
3
2
!
3
6
!
!
!
!
4
4
4
4
4
3
3
3
2
1
0
0
Swell
Height Map
Wave Height (m) & direction (?)
2.1
W
3
WSW
3.5
WSW
3
SW
3.5
SW
4
WSW
4
WSW
4
WSW
3.5
WSW
3
WSW
2.4
WSW
2.4
WSW
2.2
WSW
3
WSW
3
WSW
2.5
WSW
1.7
W
1.5
W
1.2
WNW
1.1
W
0.9
WNW
Period(s) (?)121413121217161414131212121614131211121010
Wave
Graph
(?)Metric surfscale
Energy kJ (?)11873697487630152986101288170698145182618170316431316369738112327846565418255150
Wind
(km/h)
15
ESE
30
SSE
40
S
25
SE
25
SSE
40
S
40
S
30
S
15
SSE
5
ENE
10
ENE
10
ENE
5
E
0
SSE
10
NW
10
NE
10
NE
10
NE
25
ENE
30
ENE
25
ENE
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
offcross-
off
cross-
off
offoffcross-
off
cross-
off
cross-
off
cross-
off
glasscross-
off
cross-
off
glassglassoncrosscrosscrosscross-
off
cross-
off
cross-
off
High Tide
/ height (m)
5:44AM
2.75
6:10PM
1.97
6:27AM
2.72
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
Low Tide
/ height (m)
10:56PM
0.65
12:09PM
0.78
11:42PM
0.96
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
Saturday
10
Sunday
11
Monday
12
Tuesday
13
Wednesday
14
Thursday
15
Fri
16
Sunrise-8:00--7:58--7:58--7:58--7:58--7:56--7:56-
Sunset--4:47--4:49--4:50--4:51--4:52--4:53--4:54
cloud
cloud
mod rain
heavy rain
mod rain
mod rain
light rain
light rain
cloud
part cloud
clear
clear
clear
part cloud
clear
clear
clear
clear
clear
clear
clear
Rain (mm)
--6376642-------------
Temp. °C101099910111011131415141111108961112
Feels °C (?)5112312491112141299856-145
  • 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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