Ammonias Surf Break

Lat Long: 21.95° N 159.35° W

Ammonias Surf Forecast and Surf Report

Issued: 1 am 15 Jul 2026 (local time)

Forecast update in  hr  min

Today's Ammonias sea temperature is
26.4° 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 15 Jul 2026:

  • Most powerful swell: Tuesday 21 Jul, 8PM (local time) - 3.5ft (1.0m), 14s period, S swell with 357 kJ wave energy.

Best Forecast Surf Conditions for Ammonias this week:

The most powerful waves expected at Ammonias in the next 16 days are 1.0m 14s and forecast to arrive on Tuesday (Jul 21) 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 1.2m 7s period and expected on Monday (Jul 20) at 5PM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 8PM (Tue 21st Jul)3.5ft (1.0m) 14s

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


The Lowdown

Alright, Rusty here. Let's look at what's cookin' for Ammonias. Got to level with you – it's a pretty grim outlook for the next couple weeks. This reef setup is fairly consistent and it loves swell from the SSE, but the wind is just not playing ball.

We start off on Wednesday, July 15th with nothing. Tiny, messy swell and that east wind blowing cross-onshore, making it choppy and ugly. That sets the tone for a long stretch of poor conditions. Day after day, moderate east winds are just trashing the surface. The combined wave energy bounces around in the moderate to strong range, but it doesn't matter when the wind is junk. Water temp is about 80°, which is normal for this time of year, but you won't be enjoying it.

There's a little flicker on Sunday, July 19th. Swell bumps up to about 5 feet from the east, but with a short period of 8 seconds, it's weak and crumbly. Wind is still cross. It's marginal at best. That's the highlight of the first week, and that's saying something.

A big, long-period south swell starts moving in around Tuesday, July 21st. Swell direction swings south, off the optimum. The period stretches to 15 to 24 seconds – real groundswell – but those long lines are gonna feel that cross wind. The energy numbers are big, hitting over 800, but every session is called marginal. Wednesday the 22nd and Thursday the 23rd have the biggest energy, over 1000, but the wind stays cross or cross-on. It's a promise that isn't kept.

If you're really itching, the end of the second week is your best bet. Around Saturday, July 25th, the wind eases to a gentle breeze from the east at about 9 mph. We've got a 2-foot swell from the south with a 19-second period. Still cross-onshore, but gentler. The energy is strong. It's still marginal, but for this run, that's as close to rideable as it gets. Sunday, July 26th is similar but the wind picks up.

I can't point to a single standout in this whole 16-day stretch. The swell shows up, especially the long-period stuff, but the wind is the enemy. It's nearly always cross-onshore or cross, leaving the surface messy. A reef like Ammonias needs clean conditions to work, and we ain't getting 'em. It's a blank run, and when the trades set in here, that's just the way it goes. Keep your eye on the forecast – things can change.

Rusty.

Short Range Forecast

Light rain (total 2mm), mostly falling on Wed night. Warm (max 26°C on Wed morning, min 24°C on Wed morning). Wind will be generally light.

Days 4-6 Weather Summary

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

Wednesday
15
Thursday
16
Friday
17
Saturday
18
Sunday
19
Monday
20
Tuesday
21
AM
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
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
1
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)
0.7
SW
13
0.9
ENE
7
0.8
SSW
16
0.7
SSW
16
0.6
SSW
17
0.7
SSW
14
1.4
ENE
6
1.4
ENE
7
1.3
ENE
7
0.7
SSW
14
0.7
SSW
14
1.4
E
7
1.5
E
8
1.4
ENE
8
1.3
ENE
8
1.2
ENE
8
0.6
S
16
0.6
S
15
0.9
S
15
0.9
S
14
1
S
13
Wave Graph
Metric surfscale
Energy kJ
162
86
314
237
195
183
170
196
158
204
210
171
279
226
201
158
188
165
339
311
347
Wind (km/h)
15
E
15
E
15
E
20
E
20
ENE
20
ENE
20
ENE
20
ENE
20
ENE
20
ENE
20
ENE
20
ENE
20
ENE
25
NE
20
ENE
20
ENE
20
NE
20
ENE
25
ENE
25
ENE
20
ENE
Wind State
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
cross
cross
cross
cross
cross-on
cross
cross
cross
cross
cross
cross
cross
cross
cross
High Tide
5:08PM0.73m
4:55AM0.26m
5:45PM0.67m
5:57AM0.28m
6:18PM0.59m
7:07AM0.31m
6:48PM0.51m
8:26AM0.35m
7:13PM0.43m
9:50AM0.41m
7:25PM0.35m
11:06AM0.46m
Low Tide
9:34AM-0.07m
00:10AM0.09m
10:22AM-0.02m
00:42AM0.08m
11:11AM0.05m
1:14AM0.06m
12:04PM0.14m
1:46AM0.05m
1:11PM0.23m
2:18AM0.05m
2:53PM0.29m
2:52AM0.04m
3:30AM0.04m
clear
clear
rain showers
clear
clear
part cloud
part cloud
clear
clear
clear
clear
rain showers
rain showers
clear
clear
clear
clear
rain showers
clear
rain showers
rain showers
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:01
6:03
6:03
6:03
6:03
6:03
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
7:22
7:22
 mm
2
3
1
1
1
5
Temp °C
26
26
25
26
26
25
26
26
25
26
26
25
25
26
24
25
26
24
25
25
24
Feels °C
27
27
26
26
26
25
26
26
25
26
26
26
24
25
23
24
25
23
24
24
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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