Ammonias Surf Break

Lat Long: 21.95° N 159.35° W

Ammonias Surf Forecast and Surf Report

Issued: 1 pm 17 Jul 2026 (local time)

Forecast update in  hr  min

Today's Ammonias sea temperature is
26.5° C
0.2° 

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


Ammonias surf forecast from 18 Jul 2026:

  • Most powerful swell: Thursday 23 Jul, 8PM (local time) - 3ft (0.9m), 19s period, SSW swell with 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 0.9m 19s and forecast to arrive on Thursday (Jul 23) at 8PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 13s period and expected on Friday (Jul 17) at 8PM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 8PM (Thu 23rd Jul)3ft (0.9m) 19s

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


The Lowdown

Alright, this is Rusty. Let's talk about what's on the menu at Ammonias for the next couple of weeks.

Honestly, I’m looking at this forecast and it’s a bit of a slow burn. Right now, there’s nothing really happening. The start of the period is a real disappointment. We’re looking at a solid week of pretty ordinary conditions. The wind is mostly coming out of the ENE, which is a cross or cross-onshore, and that’s just messing things up. The water’s sitting at 80°, which is pretty much normal for this time of year, so no surprises there.

The first real sign of life doesn’t show up until the morning of the 27th of July. The swell is coming from the east at 4ft, but it’s got a long period of 16 seconds, which is a proper groundswell. The energy is moderate for this spot (1188), and the wind is a cross-shore. It’s still rated as marginal, but it’s a step up from the junk we’ve been dealing with. The wind is still not ideal, but it’s manageable.

Then, the best window of the whole forecast is Tuesday the 28th of July. This is the stand-out. The swell is solid out of the east, 6ft in the morning and 6ft in the afternoon. The period is a long 15 seconds, so it’s got real power and shape. The combined energy (1783) is strong, and the wind is a much lighter cross-shore, which means the surface will be a lot cleaner. This is the day to circle on your calendar. It’s the biggest, cleanest swell we’re going to see. The swell direction from the east is a good match for the optimum from the SSE, meaning it’ll wrap in nicely. The only downside is that at 6ft, it’s pushing into the size that will be a bit much for beginners, but for an intermediate surfer, it’s a treat.

After that, the surf drops off again. The last week of the forecast is a mix of smaller, short-period swells and more cross-onshore winds. There’s a bit of energy left on the 29th and 30th of July, but the quality drops right off. It’s a lot of close-out potential and chop. By the 1st of August, we’re back to tiny, weak 2ft waves with poor conditions.

So, to sum it up: the first week is a write-off. The 27th of July offers a little bit of hope, but the 28th of July is the clear winner. After that, it fades away. The breaks are fairly consistent in that they can work, but the conditions are the deciding factor here, and they’re mostly against us.

Rusty.

Short Range Forecast

Light rain (total 2mm), mostly falling on Fri night. Warm (max 26°C on Fri afternoon, min 23°C on Sat night). Wind will be generally light.

Days 5-7 Weather Summary

Light rain (total 5mm), mostly falling on Tue night. Warm (max 26°C on Mon afternoon, min 23°C on Mon night). Wind will be generally light.

Fri
17
Saturday
18
Sunday
19
Monday
20
Tuesday
21
Wednesday
22
Thursday
23
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
0
0
0
1
0
0
0
0
0
0
1
1
1
0
0
0
0
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)
1.4
ENE
7
1.5
ENE
7
1.6
ENE
7
1.9
ENE
7
1.8
ENE
8
1.5
ENE
8
1.4
ENE
8
1.3
ENE
8
1.3
ENE
8
0.6
S
16
1.3
ENE
7
0.9
S
15
0.9
S
14
1
S
13
0.6
SSW
24
0.6
SSW
23
0.7
SSW
22
0.8
SSW
20
0.7
SSW
20
0.9
SSW
18
Wave Graph
Metric surfscale
Energy kJ
196
204
214
366
346
253
226
202
196
188
172
343
316
342
437
426
480
528
399
469
Wind (km/h)
20
ENE
20
ENE
25
ENE
25
ENE
20
NE
20
ENE
25
NE
20
NE
20
ENE
20
NE
15
ENE
20
NE
20
ENE
20
ENE
25
ENE
20
ENE
20
ENE
20
ENE
25
ENE
20
ENE
Wind State
cross
cross-on
cross-on
cross
cross
cross
cross
cross
cross-on
cross
cross
cross
cross
cross-on
cross-on
cross-on
cross-on
cross-on
cross
cross
High Tide
6:18PM0.59m
7:07AM0.31m
6:48PM0.51m
8:26AM0.35m
7:13PM0.43m
9:50AM0.41m
7:25PM0.35m
11:06AM0.46m
12:06PM0.52m
12:55PM0.57m
Low Tide
1:14AM0.06m
12:04PM0.14m
1:46AM0.05m
1:11PM0.23m
2:18AM0.05m
2:53PM0.29m
2:52AM0.04m
3:30AM0.04m
4:16AM0.04m
clear
rain showers
rain showers
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
rain showers
rain showers
rain showers
part cloud
clear
clear
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:03
6:03
6:03
6:05
6:05
6:05
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:22
7:22
7:22
7:22
7:22
7:21
7:21
 mm
1
1
2
2
1
Temp °C
26
25
26
26
25
25
26
24
25
26
24
25
25
24
25
25
24
25
26
25
Feels °C
26
25
26
25
25
24
25
22
24
25
24
25
24
24
24
24
23
24
25
24
  • 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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