Ammonias Surf Break

Lat Long: 21.95° N 159.35° W

Ammonias Surf Forecast and Surf Report

Issued: 1 pm 04 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 5 Aug 2026:

  • Most powerful swell: Tuesday 4 Aug, 11PM (local time) - 5ft (1.5m), 11s period, ENE swell with 496 kJ wave energy.

Best Forecast Surf Conditions for Ammonias this week:

The most powerful waves expected at Ammonias in the next 16 days are 1.5m 11s and forecast to arrive on Tuesday (Aug 04) at 11PM. Winds are predicted to be cross-onshore at the time the swell arrives.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful11PM (Tue 4th Aug)5ft (1.5m) 11s

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


The Lowdown

Alright, let’s get into it. The next couple of weeks are looking pretty ordinary for most of us, to be honest. There’s a real lack of clean, well-ordered swell. We’re dealing with a lot of cross-shore and cross-onshore energy, which is making most spots a lumpy, choppy mess. Hold onto your boards, ’cause it’s a waiting game for the most part.

The first recommendation is for Ammonias on Tuesday the 4th of August. It’s a reef break, so it’s got that going for it. We’re looking at a 5ft swell from the ENE, but the period is a touch short at 11 seconds. The wind is a gentle breeze from the ENE, but it’s cross-shore, so expect a bit of a chop. The water temp is 80°F, which is about normal for this time of year. The combined energy is moderate at 614, but honestly, it’s only a marginal call. It’s not a day to get too excited about, but it’s the best we’ve got to start. The direction is from the ENE, which is a bit off from the optimum SSE for this spot, so it won't be at its best.

Then we have a bit of a dry spell. There’s nothing really worth paddling out for from Wednesday the 5th through to Monday the 10th. The swell is there, around 4ft to 6ft, but the periods are short and the wind is constantly messing it up. It’s just poor conditions, nothing that’ll get your heart racing. The combined energy is moderate, but it doesn’t matter when the surface is that chopped up.

Tuesday the 11th and Wednesday the 12th start to show a little more promise. The swell period jumps up to 15-18 seconds, signaling a proper groundswell. The height is around 3ft to 5ft, and the combined energy is ramping up big time, hitting 1037 on the Wednesday morning. The wind is still cross-shore, but the longer period suggests better shaped waves. The swell direction is from the S, which is much more in line with what Ammonias likes. Wednesday afternoon looks like the pick of these two days, with that 4ft S swell at 18 seconds. It’s still cross-shore, but the potential for a cleaner wave is much higher.

Thursday the 13th and Friday the 14th are a mixed bag. The swell is still from the S with a long period, but the wind picks up, especially on Friday, with a fresh breeze making it lumpy. The energy is still strong, but the chop will be a factor. It’s a step back from the promise of Wednesday.

Then we get to the real size at the end of the window. From Saturday the 15th, the swell builds steadily, but it's from the ENE with a short period. By Monday the 17th, we’re looking at 8ft, and by Tuesday the 18th, it’s hitting 10ft. This is when it gets serious. The combined energy is strong to very strong, hitting 1583 on Tuesday morning. But, this is where I have to be honest with you. This is a short-period, wind-driven swell, and with those cross-shore winds, it’s going to be a beast. At 8ft and above, this is expert territory only. The break is a reef, which will handle the size better than a beach, but the short period will make it relentless and walls. The conditions will be challenging, to say the least. This looks more like a day for the tow-in crew or maybe even the kite surfers than your average weekend surfer.

The standouts in this whole window are the S swells on the 12th and 13th. The Wednesday afternoon with that 18-second period and 4ft of S swell is the one I’d be circling. Long-period, clean energy, and the swell direction is right. It’s only a couple of meters, but it could be proper. The second one is the Thursday morning, but the wind is more on it. Those are the days to try and get some time off for.

Everything else is either too small, too short-period, or too chopped up to be worth the paddle. It’s a classic case of a long-range forecast looking promising, but the near-term reality being a bit grim. Keep an eye on that forecast, because things can change, but as it stands, patience is the key.

Rusty

Short Range Forecast

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

Days 5-7 Weather Summary

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

Tue
4
Wednesday
5
Thursday
6
Friday
7
Saturday
8
Sunday
9
Monday
10
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
0
1
0
0
0
0
0
0
0
0
0
1
1
0
0
1
1
0
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
11
1.5
ENE
11
1.3
ENE
10
1.2
ENE
10
1.3
ENE
9
1.3
ENE
8
1.3
ENE
8
0.4
SSW
14
0.4
SW
21
0.4
SW
20
1.3
ENE
6
1.6
ENE
6
1.6
ENE
6
2
ENE
7
1.9
ENE
7
1.8
ENE
7
1.7
ENE
7
1.7
ENE
7
1.6
ENE
7
0.8
SSW
15
Wave Graph
Metric surfscale
Energy kJ
452
476
325
253
262
228
223
81
115
98
148
218
200
340
365
340
294
294
268
296
Wind (km/h)
15
ENE
15
ENE
20
ENE
15
ENE
20
ENE
20
ENE
20
ENE
15
NE
20
ENE
20
ENE
20
ENE
25
ENE
25
ENE
25
ENE
20
ENE
25
ENE
20
ENE
20
ENE
20
ENE
20
ENE
Wind State
cross
cross
cross-on
cross
cross
cross
cross
cross
cross-on
cross
cross
cross
cross
cross
cross
cross
cross-on
cross
cross
cross-on
High Tide
6:28PM0.37m
10:10AM0.50m
11:24AM0.57m
12:26PM0.64m
1:18PM0.69m
00:17AM0.19m
2:05PM0.73m
1:24AM0.22m
2:47PM0.75m
2:17AM0.26m
Low Tide
2:08PM0.29m
1:58AM0.03m
2:46AM0.02m
3:47AM0.01m
4:56AM-0.01m
9:20PM0.16m
6:02AM-0.03m
9:35PM0.15m
7:01AM-0.05m
9:56PM0.13m
part cloud
part cloud
part cloud
cloud
part cloud
cloud
cloud
thunderstorm
cloud
part cloud
cloud
light rain
cloud
part cloud
part cloud
part cloud
part cloud
part cloud
thunderstorm
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:11
6:11
6:11
6:11
6:11
6:13
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:15
7:15
7:14
7:13
7:13
7:12
7:10
 mm
1
1
1
Temp °C
26
25
25
26
25
26
26
25
26
26
25
25
26
25
26
26
25
26
26
25
Feels °C
27
26
27
27
26
27
27
26
26
26
25
26
25
25
26
25
25
27
27
26
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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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