Ammonias Surf Break

Lat Long: 21.95° N 159.35° W

Ammonias Surf Forecast and Surf Report

Issued: 7 pm 29 Jul 2026 (local time)

Forecast update in  hr  min

Today's Ammonias sea temperature is
26.5° 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 30 Jul 2026:

  • Best quality surf: Thursday 30 Jul, 5AM (local time) - 3ft (0.9m), 13s period, S swell with glassy winds.
  • Most powerful swell: Sunday 2 Aug, 2AM (local time) - 8ft (2.5m), 8s period, ENE swell with 979 kJ wave energy.
  • Next surfable swell (1★+): Thursday 30 Jul, 5AM (local time) - 3ft (0.9m), 13s period with S 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 Thursday (Jul 30) at 5AM. The primary swell is predicted to be 0.9m and 13s period with a secondary swell of 1.2m and 9s. The wind is predicted to be glassy as the swell arrives.

The most powerful waves expected at Ammonias in the next 16 days are 2.5m 8s and forecast to arrive on Sunday (Aug 02) at 2AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.2m 8s period and expected on Thursday (Jul 30) at 11AM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+) 5AM (Thu 30th Jul)3ft (0.9m) 13s
Best Surf 5AM (Thu 30th Jul)3ft (0.9m) 13s
Most Powerful 2AM (Sun 2nd Aug)8ft (2.5m) 8s

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


The Lowdown

Alright folks, Rusty here. Let’s take a good, hard look at what we’ve got coming down the line for Ammonias over the next couple of weeks. Gotta be straight with you – it’s a bit of a rough stretch.

For the entire 16-day window, the surf at Ammonias is pretty grim. The wind is almost always coming out of the east or east-northeast, and that puts it straight into "cross" or "cross-on" territory for this exposed reef break. That means bumpy, choppy, and messy conditions pretty much the whole time. We’ve got a lot of wave energy kicking around – the combined energy score hits a hefty 1257 on Saturday the 1st of August – but all that power is wasted on these cross-shore winds. There’s no period with clean, offshore conditions lined up, so it’s going to be a battle.

Thursday 30th July kicks things off with a 3 ft S swell, a period of 13 seconds, but light east winds are blowing cross-on, giving us small wind ripples and poor surf. The wave energy is moderate (438). Not a winner.

Friday 31st July sees the size jump to 5-6 ft, but the period drops right off to a short, weak 7 seconds. That E and ENE wind is still cross-on and cross, making it choppy. The energy climbs (774-905), but the quality isn't there.

Saturday 1st August and Sunday 2nd August are the biggest days of the window, with swell hitting 8 ft. That’s expert territory for size alone. But with fresh breezes at 18 mph coming from the ENE, it’s a lumpy, cross-chop nightmare. The energy is very strong (1257 and 1130), but this is a setup that would be far more interesting for a kite surfer than a paddle surfer. Marginal at best.

Monday 3rd August down to Thursday 7th August is a long stretch of similar misery: 4-6 ft swell, mostly short period (6-8 seconds), and persistent moderate to fresh cross or cross-on winds. The energy fluctuates between moderate and strong (292 to 871), but the quality is a solid zero. You’d be battling chop and bump the whole time.

Friday 8th August brings a tiny 2-3 ft S swell with a very long 18-second period. The combined energy is still moderate (676-663). This long-period groundswell would normally be a dream for a reef like Ammonias, but the wind is still a moderate cross-shore. It’s a tease.

Monday 10th August has a similar story: 3-4 ft SSW swell with a long 15-16 second period (energy 875-826). Still, the wind is from the ENE and NE, keeping things cross and messy.

The final few days, Tuesday 11th August to Friday 14th August, offer a glimmer. The 11th has a light cross-on breeze, and by the afternoon we actually get a light offshore wind from the SE for a moment (3 ft S swell, 14 seconds). That glassy window is the only time the wind is truly in our favour in the entire 16-day run. The energy is moderate (547). It’s a tiny window of hope, but the surf itself is still marginal.

After that, it’s back to east winds and poor surf. Honestly, it’s a tough outlook. There is no true standout here. The best you could hope for is that tiny offshore window on the afternoon of Tuesday 11th August lines up for you, but even then, the swell’s only 3 ft. For the rest, if you’re desperate, maybe look for a break that handles the east wind better, because Ammonias is not it.

Keep an eye on it, though. Forecasts change.

Rusty.

Short Range Forecast

Some drizzle, heaviest during Sat afternoon. Warm (max 27°C on Thu morning, min 24°C on Fri night). Winds increasing (calm on Wed night, fresh winds from the ENE by Fri night).

Days 5-7 Weather Summary

Light rain (total 5mm), mostly falling on Sat night. Warm (max 26°C on Sun afternoon, min 24°C on Sat night). Mainly fresh winds.

Thursday
30
Friday
31
Saturday
1
Sunday
2
Monday
3
Tuesday
4
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
2
0
0
0
0
1
0
1
1
1
1
0
1
1
0
1
0
1
1
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.9
S
14
0.9
S
13
0.9
S
13
1.4
ENE
8
1.6
E
7
1.8
ENE
7
2.4
ENE
7
2.5
E
8
2.5
ENE
8
2.5
ENE
8
2.4
ENE
8
2.3
ENE
8
2
ENE
8
1.7
ENE
8
1.6
ENE
8
1.5
ENE
8
1.5
ENE
12
1.5
ENE
11
1.4
ENE
11
Wave Graph
Metric surfscale
Energy kJ
297
284
276
226
285
365
595
890
792
979
840
776
567
404
361
313
614
544
444
Wind (km/h)
0
SE
10
E
20
ENE
25
ENE
25
E
25
ENE
30
ENE
30
ENE
30
ENE
30
ENE
25
ENE
30
ENE
20
NE
20
ENE
20
NE
20
ENE
20
ENE
15
ENE
15
ENE
Wind State
glassy
cross-on
cross-on
cross-on
cross-on
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross-on
cross
cross
High Tide
3:49AM0.27m
4:44PM0.65m
4:33AM0.29m
5:08PM0.61m
5:22AM0.32m
5:32PM0.57m
6:19AM0.34m
5:54PM0.51m
7:26AM0.38m
6:14PM0.44m
8:45AM0.44m
6:28PM0.37m
Low Tide
11:10PM0.13m
9:25AM0.00m
11:32PM0.11m
10:03AM0.04m
11:56PM0.09m
10:44AM0.09m
00:22AM0.07m
11:33AM0.16m
00:50AM0.05m
12:35PM0.23m
1:21AM0.04m
2:08PM0.29m
1:58AM0.03m
part cloud
clear
clear
clear
part cloud
cloud
part cloud
clear
rain showers
rain showers
rain showers
clear
part cloud
part cloud
part cloud
part cloud
cloud
cloud
rain showers
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:07
6:09
6:09
6:09
6:09
6:09
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:17
7:17
7:16
7:16
7:15
7:15
7:15
 mm
1
4
1
1
Temp °C
26
27
27
26
26
26
25
26
26
24
25
26
24
26
26
25
25
26
25
Feels °C
29
30
28
27
27
26
24
24
24
22
23
24
22
26
25
25
25
27
26
  • 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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