Ammonias Surf Break

Lat Long: 21.95° N 159.35° W

Ammonias Surf Forecast and Surf Report

Issued: 7 pm 17 Jul 2026 (local time)

Forecast update in  hr  min

Today's Ammonias sea temperature is
26.6° 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 Saturday (Jul 18) at 5AM.

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, let’s get into it. This is Rusty.

Honestly, looking at the next 16 days at Ammonias, it’s a pretty grim outlook. There’s a real dry spell here, with no solid surf on offer for the first several days. The forecast is mostly a washout for any half-decent paddle surfing through the end of the month, with a lot of cross and cross-onshore winds making a mess of things. We’re looking at a run of marginal to poor conditions for a while.

The first standout doesn’t really show up until around Saturday, July 25th. Even then, it’s only a marginal call. The morning has a 0.9m swell from the SSW with a long period of 20 seconds, and cross-shore wind which keeps it slightly cleaner, but it’s still a bit of a challenging setup. Wave energy is strong, reading 1404, but that long-period groundswell tends to wrap a bit too straight for a beach setup – it'd be best at a point or reef, but we’re working with what we’ve got here. The rating on it is *extremely* limited.

The next real window of possibility creeps in around Sunday, July 26th through Monday, July 27th. The Sunday afternoon shows a 1.1m swell from the E with a period of 17 seconds, and the energy is strong at 1740. It’s still cross-shore, but the energy is there and the direction is swinging around a bit. The best of the whole period looks to be the Monday afternoon session on the 27th: a 1.3m swell from the East with a solid 15-second period. Even with the cross-shore wind, the wave state is cleaner and more manageable than the earlier choppy garbage. That’s your best bet – the wave energy is moderate-to-strong at 1077, and for this spot, that window gives you the best chance at a few lined-up waves.

The very end of the forecast, around the 1st and 2nd of August, tries to build again with some 1.6m to 1.8m swell, but the period is short (6 to 7 seconds) and the wind is back to cross-on or onshore, so it’s going to be a blown-out, bumpy mess. Not worth getting excited for at this range.

So, for Ammonias, you’re looking at a long, quiet wait until the 27th. The Monday the 27th is the only real highlight on the cards, and even then it’s a marginal one for the more experienced crew. Crowds are often here, so with the lack of options, expect a few heads out if the wind behaves.

Rusty.

Short Range Forecast

Some drizzle, heaviest during Fri night. Warm (max 26°C on Sat morning, min 23°C on Sat night). Wind will be generally light.

Days 5-7 Weather Summary

Light rain (total 6mm), mostly falling on Tue night. Warm (max 26°C on Wed afternoon, min 23°C on Mon night). Wind will be generally light.

Saturday
18
Sunday
19
Monday
20
Tuesday
21
Wednesday
22
Thursday
23
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
0
0
0
0
0
0
1
1
1
0
0
0
0
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)
1.5
ENE
7
1.7
ENE
7
1.8
ENE
7
1.7
ENE
8
1.5
ENE
8
1.5
ENE
8
0.5
S
18
1.3
ENE
8
0.6
S
16
1.3
ENE
7
0.8
S
15
0.9
S
14
0.9
S
14
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
198
268
321
318
270
246
162
191
188
177
275
316
316
437
426
480
528
399
469
Wind (km/h)
20
ENE
25
ENE
25
ENE
20
NE
25
ENE
20
NE
20
NE
20
ENE
20
NE
15
NE
20
ENE
20
ENE
20
ENE
25
ENE
25
ENE
25
ENE
25
ENE
25
ENE
20
ENE
Wind State
cross-on
cross-on
cross-on
cross
cross-on
cross
cross
cross
cross
cross
cross
cross
cross-on
cross-on
cross-on
cross-on
cross
cross
cross
High Tide
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
rain showers
clear
clear
part cloud
clear
clear
clear
clear
clear
clear
part cloud
clear
rain showers
rain showers
rain showers
clear
clear
clear
rain showers
<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
2
2
2
1
Temp °C
25
26
26
24
25
26
24
25
26
24
25
25
24
25
26
24
25
26
24
Feels °C
25
26
25
23
24
25
23
24
26
24
25
24
24
24
25
23
24
25
23
  • 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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