Ammonias Surf Break

Lat Long: 21.95° N 159.35° W

Ammonias Surf Forecast and Surf Report

Issued: 1 pm 09 Aug 2026 (local time)

Forecast update in  hr  min

Today's Ammonias sea temperature is
26.6° C
0.0° 

Ammonias surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.


Ammonias surf forecast from 10 Aug 2026:

  • Most powerful swell: Sunday 16 Aug, 8PM (local time) - 15ft (4.5m), 13s period, ENE swell with 7,420 kJ wave energy.

Best Forecast Surf Conditions for Ammonias this week:

The most powerful waves expected at Ammonias in the next 16 days are 4.5m 13s and forecast to arrive on Sunday (Aug 16) at 8PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 3.5m 13s period and expected on Sunday (Aug 16) at 2PM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 8PM (Sun 16th Aug)15ft (4.5m) 13s

Table - best surf conditions forecast for Ammonias over the next 16 days.


The Lowdown

Alright, Rusty here, let's talk about what's on the menu for the next couple of weeks at Ammonias.

Right off the bat, things aren't looking great. We've got a whole lotta nothing for the first few days. The surf kicks off Sunday the 9th, but it's a marginal, cross-shore mess with a weak 5ft swell from the ENE and only 7 seconds between waves. That's windswell and not worth paddling out for. The water temp is sitting at 80°, which is dead average for this time of year.

Honestly, from Sunday the 9th all the way through Friday the 15th, it's a real struggle. We're looking at weak, inconsistent surf with onshore and cross-shore breezes making a mess of things. The swell energy is mostly moderate, with values (527-1301) but it's just not coming together. The 18-second period groundswell on the 12th is tempting in theory, but it’s crossed-up and messy. It’s not till Saturday the 15th that we start to see some real size building, but the wind is still a problem.

Here’s where it gets interesting. The standout window is the weekend of the 16th and 17th. By Sunday morning the 16th, a solid 12ft swell from the ENE (12-second period) is rolling in, and the wind goes clean cross-offshore from the NNE. The combined energy jumps to a very strong 3874, and by the afternoon it’s up to 13ft with 13-second period and a whopping 5750 energy. This is big, powerful surf. It's a reef break, so those long-period sets will wrap in nicely, but at that size it’s for experienced surfers only. Big waves, clean faces.

Then Monday the 17th is the real cherry on top. We get a 7ft ENE groundswell (10 seconds) with glassy conditions. A light 3 mph SE breeze, the report says "glassy." That’s as good as it gets for paddle surfing. The energy is still strong (1178), the conditions are pristine, and the crowd factor is "often" busy at this spot, so expect company if you paddle out. This is the best day of the forecast. The afternoon drops a bit to 6ft but stays clean.

After that, it unfortunately all falls apart again. From the 18th onwards, we're back to weak, onshore slop with wind and chop making things ugly. The second week is a write-off.

So to sum it up: grin and bear the first week of slop, but keep your eyes locked on the 16th and especially the 17th of August. The 16th has the raw power for the experts, but the 17th is the one with the glassy perfection. Don't sleep on it.

- Rusty

Short Range Forecast

Light rain (total 3mm), mostly falling on Mon morning. Warm (max 27°C on Sun afternoon, min 24°C on Sun night). Wind will be generally light.

Days 5-7 Weather Summary

Some drizzle, heaviest during Wed night. Warm (max 27°C on Wed afternoon, min 24°C on Wed night). Wind will be generally light.

Sun
9
Monday
10
Tuesday
11
Wednesday
12
Thursday
13
Friday
14
Saturday
15
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
1
1
1
0
2
0
1
1
1
2
2
2
1
2
0
0
1
1
2
4
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.4
ENE
7
0.7
SSW
16
0.7
SSW
16
1.4
ENE
8
0.8
SSW
15
0.7
SSW
15
0.8
SSW
14
0.7
S
20
0.9
S
18
1.1
S
18
1.5
S
16
1.4
S
16
1.4
S
15
1.3
S
15
1.2
S
14
1.1
S
14
1.9
ENE
8
2.2
ENE
10
2.5
ENE
13
3
ENE
13
Wave Graph
Metric surfscale
Energy kJ
188
263
259
234
296
222
269
373
515
741
1178
1004
906
743
598
489
434
923
2187
3301
Wind (km/h)
20
ENE
20
ENE
20
ENE
20
ENE
15
ENE
20
ENE
20
ENE
20
ENE
20
ENE
20
NE
20
ENE
25
NE
25
NE
25
NE
30
ENE
25
ENE
20
NE
30
NE
25
NE
20
NNE
Wind State
cross
cross
cross
cross
cross
cross-on
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross-off
cross-off
High Tide
2:05PM0.73m
1:24AM0.22m
2:47PM0.75m
2:17AM0.26m
3:26PM0.74m
3:06AM0.30m
4:02PM0.71m
3:54AM0.34m
4:34PM0.66m
4:44AM0.37m
5:03PM0.59m
5:36AM0.41m
5:29PM0.52m
Low Tide
9:35PM0.15m
7:01AM-0.05m
9:56PM0.13m
7:54AM-0.06m
10:20PM0.12m
8:43AM-0.04m
10:44PM0.10m
9:30AM-0.00m
11:09PM0.08m
10:17AM0.05m
11:35PM0.07m
11:06AM0.12m
00:00AM0.06m
clear
clear
rain showers
rain showers
part cloud
part cloud
clear
clear
clear
clear
rain showers
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:13
6:13
6:13
6:13
6:13
6:15
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:12
7:10
7:10
7:09
7:08
7:08
7:07
 mm
2
1
1
Temp °C
27
25
26
26
25
27
27
25
26
27
25
27
27
26
26
26
25
26
27
25
Feels °C
27
25
27
27
26
27
27
25
26
26
25
26
26
26
24
24
24
25
26
24
  • 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 Ammonias Surf forecast

The above surf forecast table for Ammonias provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Ammonias can be found by selecting the local surf guide option on the grey menu. Our Ammonias 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 (Ammonias) 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 Ammonias 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 Kaua'i? If you are looking for accommodation near Ammonias, camping, hotels and condos and appartments in Kaua'i, consider staying in Nawiliwili which is 2 km (1 miles) away. Alternatively, find information about places to stay and car hire in Lihue - Kauai which is 3 km (2 miles) away

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