Ammonias Surf Break

Lat Long: 21.95° N 159.35° W

Ammonias Surf Forecast and Surf Report

Issued: 7 pm 11 Aug 2026 (local time)

Forecast update in  hr  min

Today's Ammonias sea temperature is
26.6° 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 12 Aug 2026:

  • Most powerful swell: Sunday 16 Aug, 5PM (local time) - 16ft (5.0m), 10s period, E swell with 5,657 kJ wave energy.

Best Forecast Surf Conditions for Ammonias this week:

The most powerful waves expected at Ammonias in the next 16 days are 5.0m 10s and forecast to arrive on Sunday (Aug 16) at 5PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.3m 12s period and expected on Thursday (Aug 13) at 5AM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 5PM (Sun 16th Aug)16ft (5.0m) 10s

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


The Lowdown

Right then, let’s have a look at what’s cookin’ at Ammonias. It’s a reef setup, exposed to the swell, and it likes it coming from SSE. This spot’s fairly consistent, but don’t expect a party every day. The crowds are often here, so keep that in mind.

Wednesday the 12th kicks things off with a bit of a whimper. We’ve got a long-period S swell at about 3 ft, but that 20 km/h cross-on wind is messing it up. The water temp is about average for this time of year. The wave energy is moderate (984), but the quality’s poor. The afternoon picks up a little to 4 ft, still cross, still messy. It’s not really on.

Thursday the 13th is more of the same. 5 ft in the morning with a 16-second period, but that cross wind keeps it lumpy. Energy’s moderate (1188). The afternoon drops off. Friday’s looking average at best. We’re stuck in a pattern of cross-shore chop.

Then Saturday the 15th rolls in with a shift. The swell jumps to 8 ft from the ENE, but it’s short-period stuff at 8 seconds, and the wind’s howling at 30 km/h cross. The energy’s moderate (1047), but it’s lumpy and bumpy. Not the kind of day you’d call your mates about. By Sunday the 16th, it’s getting serious – 16 ft from the East, but that’s a monster for experts only. With 30 km/h onshore wind and over 6000 in wave energy (strong), this isn’t a paddle session. A setup like this looks more interesting for kite surfing than paddle surfing.

The early part of the next week stays messy. Monday the 17th has 7 ft from the ENE, but it’s still cross-on and choppy. Through Tuesday and Wednesday, the swell drops and the period gets real short – down to 6 seconds. That’s just weak, choppy junk. The energy drops off too.

After a quiet spell, things get interesting around the 24th. Monday the 24th afternoon is the first standout. It’s a glassy session – S wind at just 5 km/h, with a 3 ft swell from the SSW at 13 seconds. That’s clean, that’s proper. The wave energy is moderate (648), but the conditions are very good. That’s the one to circle. Tuesday the 25th afternoon is another goer: glassy again, 3 ft from the SSW at 15 seconds. Another clean window. These are your best bets. The swell direction is a little off the optimum (SSE vs SSW), but the glassy wind makes up for it. Just remember, at 3 ft it’s small, so it’ll be fun but not a day for the big-wave guns.

The last few days of the outlook have some marginal conditions, with light winds but not quite glassy. The 27th gets choppy again. So, the standout is the afternoon of Monday the 24th and Tuesday the 25th. The rest of the run is a bit of a write-off, but those two windows look sweet.

Rusty.

Short Range Forecast

Mostly dry. Warm (max 27°C on Thu morning, min 24°C on Wed night). Wind will be generally light.

Days 5-7 Weather Summary

Heavy rain (total 59mm), heaviest during Sun morning. Warm (max 27°C on Mon morning, min 25°C on Fri night). Winds decreasing (near gales from the ENE on Sun morning, light winds from the ESE by Sun night).

Wednesday
12
Thursday
13
Friday
14
Saturday
15
Sunday
16
Monday
17
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
1
0
2
0
2
0
2
0
0
0
1
1
0
0
0
1
1
0
1
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.7
S
20
0.9
S
18
1.1
S
18
1.5
S
16
1.4
S
16
1.3
S
15
1.3
S
15
1.2
S
14
1.1
S
14
1
S
14
2.4
ENE
8
2.5
ENE
9
2.5
ENE
10
3
ENE
9
5
E
10
3
E
9
2
ENE
8
1.9
ENE
8
1.8
ENE
7
Wave Graph
Metric surfscale
Energy kJ
373
515
741
1178
1004
784
743
598
496
415
745
949
1287
1494
5657
1215
554
441
328
Wind (km/h)
15
ENE
20
ENE
25
NE
25
ENE
20
NE
25
NE
25
NE
25
ENE
25
NE
25
NE
30
NE
35
NE
40
NE
45
E
30
ESE
20
ESE
15
E
25
E
20
ENE
Wind State
cross
cross-on
cross
cross-on
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross-on
on
on
cross-on
cross-on
cross
High Tide
3:06AM0.30m
4:02PM0.71m
3:54AM0.34m
4:34PM0.66m
4:44AM0.37m
5:03PM0.59m
5:36AM0.41m
5:29PM0.52m
6:32AM0.43m
5:50PM0.44m
7:34AM0.46m
6:01PM0.36m
Low Tide
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
12:01PM0.20m
00:26AM0.06m
1:11PM0.26m
00:55AM0.06m
clear
clear
clear
part cloud
part cloud
clear
part cloud
part cloud
clear
part cloud
rain showers
rain showers
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
part cloud
rain showers
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:13
6:13
6:13
6:15
6:15
6:15
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:10
7:09
7:08
7:08
7:07
7:07
7:06
 mm
2
2
10
25
7
11
2
1
Temp °C
25
26
26
25
27
27
25
26
27
26
26
26
26
26
26
26
27
27
25
Feels °C
26
27
25
24
26
26
25
24
26
25
25
25
25
23
24
26
30
29
25
  • Map Icons:
  • Break
  • 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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