Ammonias Surf Break

Lat Long: 21.95° N 159.35° W

Ammonias Surf Forecast and Surf Report

Issued: 7 am 15 Aug 2026 (local time)

Forecast update in  hr  min

Today's Ammonias sea temperature is
26.7° C
0.1° 

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


Ammonias surf forecast from 15 Aug 2026:

  • Best quality surf: Saturday 22 Aug, 2AM (local time) - 2.5ft (0.8m), 16s period, SSW swell with cross-offshore winds.
  • Most powerful swell: Sunday 16 Aug, 8AM (local time) - 15ft (4.5m), 10s period, E swell with 3,574 kJ wave energy.
  • Next surfable swell (1★+): Saturday 22 Aug, 2AM (local time) - 2.5ft (0.8m), 16s period with SSW swell.

Best Forecast Surf Conditions for Ammonias this week:

The surf forecast for Ammonias over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Saturday (Aug 22) at 2AM. The primary swell is predicted to be 0.8m and 16s period. The wind is predicted to be cross-offshore as the swell arrives.

The most powerful waves expected at Ammonias in the next 16 days are 4.5m 10s and forecast to arrive on Sunday (Aug 16) at 8AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 7s period and expected on Friday (Aug 21) at 5PM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+) 2AM (Sat 22nd Aug)2.5ft (0.8m) 16s
Best Surf 2AM (Sat 22nd Aug)2.5ft (0.8m) 16s
Most Powerful 8AM (Sun 16th Aug)15ft (4.5m) 10s

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


The Lowdown

G’day, it’s Rusty. Straight up, the next couple of weeks at Ammonias ain't looking good for a proper paddle. We've got a long run of onshore and cross-shore winds, lumpy chop, and very few windows where the ocean cleans up enough to make it worth your while. The swell energy is all over the place, but it's mostly from the wrong angles, and the poor conditions will keep the lineup pretty empty—maybe the only positive.

Water temp is 80°F, which is right about average for this time of year. Nowt weird there.

We start Saturday the 15th. There's a bit of swell at 8ft with a short, peaky 8-second period, but the wind is a fresh 30 km/h cross-shore, and the surface is lumpy as all get-out. Wave energy is moderate at 1250, but the quality is shot. By the afternoon, it jumps to 10ft with rain showers and a 35 km/h cross breeze, making it a complete mess. Not your day.

Sunday the 16th kicks up to 13ft with a 10-second period and strong 40 km/h cross-onshore winds. That's big, raw, and blown out—only for the kamikaze crew. Energy is strong at 3175, but it's a wall of whitewater. The afternoon eases to 8ft but the wind stays messy.

Monday the 17th drops to 6ft, but the 25 km/h cross-onshore wind keeps things ugly. Period drops to 8 seconds, energy 846, and it's just lumpy. The afternoon is still cross-shore and chopped. Forget it.

From Tuesday the 18th through Thursday the 29th, the story doesn't improve. Swell heights mostly hover between 2ft and 5ft. The wind stays locked in from the ENE, mostly cross-on or cross-shore with a chop. There's a few moments with longer period SSW groundswell, like on the 20th and 21st with 17-18 second periods, but the height is rubbish—2ft to 2ft—and the energy is weak, around 300-400. It's the kind of swell that might roll through the reefs, but with no push, and the winds are never fully offshore.

The only brief window where things look halfway decent is around the 27th, 28th, and 29th of August. The swell gets a bit more meaningful at 4ft to 5ft, with a long 18-second period from the E on the 27th. Energy jumps to 1639-1728, which is moderate to strong. But the wind is still moderate cross-onshore in the mornings. The afternoons on the 28th and 29th turn to a cross-shore breeze, and while it's still not glassy, it's the cleanest we'll see in this stretch. The break will be inconsistent, though—it's a reef that needs the right tide. We're talking about marginal waves, maybe waist-high plus, but with that long period E swell, it could offer a few lined-up ones if you're patient. It's not a standout, but it's the best of a bad lot.

For most of this 16-day span, the setup is more interesting for the kite surfers than us paddlers. The onshores are consistent and there's enough swell to get them going.

For the few of you who are serious, keep an eye on the 27th through the 29th. The promise is there, but it's a long-range call, so don't book the day off yet. If it cleans up, a few of us might get a proper session in. Until then, keep the boards in the shed.

Rusty.

Short Range Forecast

Heavy rain (total 42mm), heaviest during Sun morning. Warm (max 26°C on Sat morning, min 24°C on Sat night). Winds decreasing (strong winds from the ENE on Sat night, moderate winds from the E by Sun night).

Days 4-6 Weather Summary

Mostly dry. Warm (max 26°C on Tue afternoon, min 24°C on Tue morning). Wind will be generally light.

Saturday
15
Sunday
16
Monday
17
Tuesday
18
Wednesday
19
Thursday
20
Friday
21
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
1
0
0
0
0
0
0
1
0
0
0
0
0
1
0
0
1
1
0
1
2
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
2.5
ENE
8
3
ENE
9
4
E
10
4
E
10
2.5
ENE
9
2
ENE
8
1.9
ENE
8
1.8
ENE
7
0.8
S
14
0.7
S
13
1.3
ENE
6
0.6
S
13
1.1
ENE
7
1.1
ENE
7
0.5
SW
16
0.6
SSW
18
0.6
SSW
17
0.7
SW
16
0.7
SSW
17
0.7
SW
16
0.8
SSW
16
Wave Graph
Metric surfscale
Energy kJ
866
1432
3233
2876
906
511
397
328
232
168
121
117
118
110
130
207
195
278
255
258
322
Wind (km/h)
30
NE
35
NE
45
ENE
40
E
25
ESE
20
E
25
ENE
25
ENE
25
ENE
20
ENE
20
ENE
15
ENE
15
ENE
15
ENE
15
ENE
15
ENE
15
ENE
10
NE
10
ENE
10
ENE
5
NNE
Wind State
cross
cross
cross
cross-on
cross-on
cross-on
cross-on
cross
cross
cross
cross
cross
cross-on
cross
cross
cross-on
cross
cross
cross-on
cross-on
cross-off
High Tide
5:29PM0.52m
6:32AM0.43m
5:50PM0.44m
7:34AM0.46m
6:01PM0.36m
8:46AM0.48m
5:31PM0.30m
10:06AM0.50m
11:20AM0.53m
12:20PM0.56m
11:30PM0.20m
Low Tide
11:06AM0.12m
00:00AM0.06m
12:01PM0.20m
00:26AM0.06m
1:11PM0.26m
00:55AM0.06m
3:13PM0.30m
1:28AM0.08m
2:14AM0.09m
3:21AM0.10m
9:24PM0.19m
clear
rain showers
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
part cloud
part cloud
clear
part cloud
part cloud
clear
part cloud
clear
clear
part cloud
clear
part cloud
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:15
6:15
6:15
6:16
6:16
6:16
6:16
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:07
7:07
7:06
7:06
7:05
7:04
7:02
 mm
2
5
13
12
8
2
Temp °C
26
26
25
25
25
26
25
26
25
25
26
25
26
26
25
26
26
25
26
26
25
Feels °C
25
24
23
22
25
27
26
26
26
24
26
26
27
27
27
27
27
27
28
28
28
  • 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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