Ammonias Surf Break

Lat Long: 21.95° N 159.35° W

Ammonias Surf Forecast and Surf Report

Issued: 1 am 02 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 2 Aug 2026:

  • Most powerful swell: Sunday 2 Aug, 8AM (local time) - 8ft (2.4m), 8s period, ENE swell with 840 kJ wave energy.

Best Forecast Surf Conditions for Ammonias this week:

The most powerful waves expected at Ammonias in the next 16 days are 2.4m 8s and forecast to arrive on Sunday (Aug 02) at 8AM. Winds are predicted to be cross-shore at the time the swell arrives.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 8AM (Sun 2nd Aug)8ft (2.4m) 8s

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


The Lowdown

Right, let’s be straight with you. For the next 16 days, we're looking at a real mixed bag at Ammonias, and honestly, for the first week, it's pretty grim. You’re not going to want to paddle out for most of it.

We kick things off on Sunday, August 2nd with a bit of swell on the board, around 8ft, but it’s coming from the ENE. That’s a cross-shore wind at 19 mph, leaving it lumpy and cross-choppy. Not good. The energy is moderate at best (1066), but it’s just not clean. This continues through Monday, with the size dropping to 6ft and winds staying cross-shore, but it’s still a mess.

Tuesday the 4th sees the period jump up to 12 seconds, which is a bit better, but the swell has dropped to 5ft and it’s still cross-shore. The energy remains moderate (668), but it’s still marginal. Honestly, it’s one of those times you’d rather be doing something else.

There’s a real flat spell coming up mid-week. From Wednesday the 5th through to the 7th, we’ve got weak, short-period junk and onshore winds. The swell drops right off, and it’s just not worth your time. You’re looking at a solid gap of a few days with nothing on offer.

We get a pulse back for the weekend of August 8th and 9th, but it’s only 6ft to 6ft of short-period ENE windswell with a 7-second period. The wind is cross-shore and 16 mph, so it’s still going to be lumpy and poor. This isn't surf, it's just bump.

The beginning of the second week, from August 10th, things start to change. The energy is still moderate, but the swell direction begins to swing around to the south. It's not big, but that long-period energy is coming. By Wednesday August 12th, we finally see something worth talking about. The swell is 4ft to 4ft, but the period is a solid 17-18 seconds, and the energy jumps up to 1351. That’s a proper groundswell. The catch is, the wind is still cross-shore, but it’s the cleanest it’s been. This is your best chance of the whole fortnight. It's promising, but there's still that cross-shore wind to contend with.

From August 13th through to the 15th, we hold on to that southern energy. It’s a consistent 4ft to 4ft swell with a period of 14-16 seconds and moderate to strong energy (around 1000). The wind stays cross-shore though, so it’s not going to be perfect, but it’s a far cry from the first week. It’s rideable.

The final days, August 16th and 17th, we see that southern energy is still there but it starts to get replaced by the ENE windswell again. The period drops back down to 7-8 seconds, and the size is around 5ft to 6ft. The clean south swell is gone, and it's back to that messy cross-shore chop. A bit of a letdown after the mid-week promise.

The standout, and I mean the only one, is Wednesday August 12th. It's the combination of the biggest, most reliable swell with the longest period and the highest energy. It’s still not perfect because of that cross-shore wind, but it’s the best you're going to get. It’s a reef break, so that long period will wrap nicely, but the waves will be powerful and hollow.

Water temp is sitting at 80°, which is normal for this time of year. All this swell, it’s looking more interesting for the kite crew than us paddle surfers for most of the run. But if you’re keen, keep an eye on that Wednesday.

Rusty.

Short Range Forecast

Some drizzle, heaviest during Tue night. Warm (max 26°C on Sun morning, min 23°C on Sun night). Mainly fresh winds.

Days 4-6 Weather Summary

Some drizzle, heaviest during Thu night. Warm (max 26°C on Wed morning, min 24°C on Wed night). Wind will be generally light.

Sunday
2
Monday
3
Tuesday
4
Wednesday
5
Thursday
6
Friday
7
Saturday
8
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
1
1
0
0
2
1
1
1
0
1
0
0
0
0
0
0
1
0
0
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
2.3
ENE
8
2.2
ENE
8
2.1
ENE
8
1.7
ENE
8
1.5
ENE
8
1.4
ENE
8
1.5
ENE
12
1.5
ENE
11
1
ENE
11
1.4
ENE
10
1.2
ENE
10
0.9
ENE
9
1
ENE
8
1
ENE
8
1.1
E
6
1.1
ENE
7
0.4
SW
20
1.6
ENE
6
1.7
ENE
7
1.8
ENE
7
1.8
ENE
7
Wave Graph
Metric surfscale
Energy kJ
776
657
574
402
306
268
583
515
245
356
269
116
137
140
81
125
98
212
277
293
308
Wind (km/h)
30
ENE
30
NE
20
NE
20
ENE
20
ENE
15
NE
15
ENE
15
ENE
15
NE
15
ENE
15
ENE
10
ENE
20
ENE
15
ENE
20
E
25
ENE
20
NE
20
E
20
ENE
25
ENE
25
ENE
Wind State
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross-on
cross-on
cross-on
cross-on
cross
cross-on
cross
cross
cross-on
High Tide
5:54PM0.51m
7:26AM0.38m
6:14PM0.44m
8:45AM0.44m
6:28PM0.37m
10:10AM0.50m
11:24AM0.57m
12:26PM0.64m
1:18PM0.69m
00:17AM0.19m
Low Tide
11:33AM0.16m
00:50AM0.05m
12:35PM0.23m
1:21AM0.04m
2:08PM0.29m
1:58AM0.03m
2:46AM0.02m
3:47AM0.01m
4:56AM-0.01m
9:20PM0.16m
clear
clear
clear
part cloud
part cloud
part cloud
cloud
part cloud
thunderstorm
cloud
cloud
part cloud
clear
clear
thunderstorm
part cloud
part cloud
cloud
cloud
cloud
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:09
6:09
6:09
6:11
6:11
6:11
6:11
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:15
7:15
7:15
7:15
7:14
7:13
7:13
 mm
1
1
Temp °C
26
26
24
25
26
24
25
26
25
26
26
25
26
26
25
26
26
25
26
26
25
Feels °C
24
24
22
25
26
24
26
27
26
27
27
27
27
27
26
26
26
26
26
26
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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