Ammonias Surf Break

Lat Long: 21.95° N 159.35° W

Ammonias Surf Forecast and Surf Report

Issued: 1 am 20 Jul 2026 (local time)

Forecast update in  hr  min

Today's Ammonias sea temperature is
26.7° C
0.3° 

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


Ammonias surf forecast from 20 Jul 2026:

  • Most powerful swell: Sunday 26 Jul, 11AM (local time) - 4.5ft (1.4m), 16s period, E swell with 1,034 kJ wave energy.

Best Forecast Surf Conditions for Ammonias this week:

The most powerful waves expected at Ammonias in the next 16 days are 1.4m 16s and forecast to arrive on Sunday (Jul 26) at 11AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.8m 8s period and expected on Sunday (Jul 26) at 11AM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful11AM (Sun 26th Jul)4.5ft (1.4m) 16s

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


The Lowdown

Alright folks, Rusty here. Let's have a look at what's on the menu for Ammonias over the next couple of weeks.

Straight up, I'm not gonna lie to you – this forecast is a bit of a mixed bag. It's not a write-off, but you're gonna have to be patient and pick your moments. The water temp is sitting at a warm 80°, which is pretty much bang on average for this time of year, so no surprises there.

The first few days are a bit of a struggle. Monday the 20th and Tuesday the 21st have some small, short-period windswell coming in from the ENE, around 3 ft to 5 ft, but it's all cross-shore wind and the wave comment says it's marginal. The combined energy is moderate (516 to 612), but it's not going to be pretty. We're looking at a bit of a slow start.

Then we hit a real rough patch from Wednesday the 22nd through to Friday the 24th. The swell gets a bit bigger, with some long-period groundswell from the SSW pushing 2 ft to 3 ft, but the wind is cross-on and the energy jumps up (1068 to 1148), which just means a lot of messy, choppy water. The comments are all "poor surf conditions". This is a classic case of the swell and wind not playing nice together. Honestly, for a beach-and-reef setup like this, you'd be better off looking at a kite on those days.

Things start to look a bit more promising around the weekend of the 25th and 26th of July. We get a pulse of ENE windswell, pushing 7 ft to 7 ft, but it's lumpy and cross-shore with a fresh breeze. The energy is strong (1351 to 1365), but the quality is still rated as marginal. However, by Sunday the 26th, the swell shifts to the east with a much longer period of 16 seconds, and the wind drops to a moderate breeze. The energy is very strong (1645 to 1822). This is a proper groundswell, and while it might be a bit testing for beginners at over 5 ft, for the experienced crew, this could be the standout window. The long period will mean better shaped waves, but watch out – it might wall up and break a bit straight on the beach. The reef points should handle it beautifully.

The first week of August brings a few more pulses, but the wind stays onshore or cross-shore and the quality is poor to marginal. There's a window on Monday the 3rd of August with ENE swell at 7 ft and energy over 1000, but the cross-onshore wind on Tuesday the 4th spoils the party.

The Bottom Line: If you're desperate for a paddle, the Sunday the 26th of July looks like the best bet. That east swell with long period and moderate cross-shore wind is the real standout. The Saturday the 25th also has size, but it's lumpy. For the rest of the run, it's a case of watching the wind and hoping for a clean-up. The best waves are likely to be on the reef points rather than the beach.

Stay salty.
Rusty.

Short Range Forecast

Heavy rain (total 20mm), heaviest during Tue night. Warm (max 26°C on Mon morning, min 24°C on Mon night). Wind will be generally light.

Days 4-6 Weather Summary

Moderate rain (total 10mm), heaviest on Thu afternoon. Warm (max 25°C on Thu morning, min 23°C on Thu night). Mainly fresh winds.

Monday
20
Tuesday
21
Wednesday
22
Thursday
23
Friday
24
Saturday
25
Sunday
26
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
1
1
1
1
0
0
2
2
0
0
2
1
1
0
2
1
2
2
1
2
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.3
ENE
7
1.4
ENE
7
1.4
ENE
7
0.8
S
15
0.9
S
14
1
S
13
0.6
SSW
24
0.7
SSW
23
0.7
SSW
22
0.8
SSW
20
0.7
SSW
20
0.9
SSW
18
2.1
ENE
7
2.1
ENE
8
2.1
ENE
8
2.2
ENE
8
1
SSW
18
1.1
E
17
1.4
E
16
1.4
E
16
1.4
E
15
Wave Graph
Metric surfscale
Energy kJ
193
207
197
275
320
352
437
564
480
528
399
469
444
495
495
574
731
702
1034
972
911
Wind (km/h)
20
NE
25
NE
15
NE
20
ENE
20
ENE
20
ENE
25
ENE
25
ENE
20
ENE
25
ENE
25
ENE
20
ENE
30
ENE
30
NE
25
ENE
25
NE
30
ENE
20
ENE
20
ENE
25
NE
20
ENE
Wind State
cross
cross
cross
cross
cross
cross-on
cross-on
cross
cross
cross-on
cross
cross
cross
cross
cross-on
cross
cross
cross
cross
cross
cross
High Tide
9:50AM0.41m
7:25PM0.35m
11:06AM0.46m
12:06PM0.52m
12:55PM0.57m
1:36PM0.61m
00:21AM0.18m
2:14PM0.63m
1:16AM0.20m
2:48PM0.65m
1:57AM0.21m
Low Tide
2:53PM0.29m
2:52AM0.04m
3:30AM0.04m
4:16AM0.04m
5:07AM0.04m
10:06PM0.17m
6:00AM0.03m
10:10PM0.16m
6:48AM0.01m
10:20PM0.16m
rain showers
clear
rain showers
rain showers
rain showers
rain showers
rain showers
clear
rain showers
part cloud
rain showers
rain showers
rain showers
rain showers
rain showers
part cloud
rain showers
rain showers
clear
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:03
6:05
6:05
6:05
6:05
6:05
6:07
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:22
7:22
7:21
7:21
7:21
7:20
7:20
 mm
1
3
2
2
7
4
1
1
1
2
1
2
1
2
Temp °C
26
26
25
26
26
25
25
25
24
25
25
24
25
25
24
25
25
24
25
26
24
Feels °C
25
24
24
26
26
25
24
24
23
24
23
23
23
23
22
24
23
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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