Ammonias Surf Break

Lat Long: 21.95° N 159.35° W

Ammonias Surf Forecast and Surf Report

Issued: 1 am 25 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 25 Jul 2026:

  • Best quality surf: Wednesday 29 Jul, 11AM (local time) - 10ft (3.0m), 12s period, ENE swell with offshore winds.
  • Most powerful swell: Wednesday 29 Jul, 11AM (local time) - 10ft (3.0m), 12s period, ENE swell with 2,360 kJ wave energy.
  • Next surfable swell (1★+): Wednesday 29 Jul, 11AM (local time) - 10ft (3.0m), 12s period with ENE swell.

Best Forecast Surf Conditions for Ammonias this week:

The surf forecast for Ammonias over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Wednesday (Jul 29) at 11AM. The primary swell is predicted to be 3.0m and 12s period with a secondary swell of 0.7m and 14s. The wind is predicted to be offshore as the swell arrives.

The most powerful waves expected at Ammonias in the next 16 days are 3.0m 12s and forecast to arrive on Wednesday (Jul 29) at 11AM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.7m 7s period and expected on Tuesday (Jul 28) at 2AM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)11AM (Wed 29th Jul)10ft (3.0m) 12s
Best Surf11AM (Wed 29th Jul)10ft (3.0m) 12s
Most Powerful11AM (Wed 29th Jul)10ft (3.0m) 12s

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


The Lowdown

Alright folks, Rusty here. Let’s get into it.

Alright, so we’ve got a bit of a tale of two weeks here at Ammonias. The first few days are pretty forgettable—cross-shore wind and a messy sea state. The real standout is slap bang in the middle of the window, Wednesday the 29th and Thursday the 30th of July. That’s the window to circle.

The water is sitting at 80°, which is about average for the time of year, so nothing to worry about on that front.

The week starts Saturday the 25th with a 3ft to 3ft SSW swell but it’s getting hammered by a fresh 19 mph cross-breeze. The combined energy is high (1401) but it’s all chop and no shape. Same story Sunday and Monday with a smaller SE and E swell, cross-winds, and marginal conditions. You’re not missing much.

Tuesday the 28th sees the swell bump up to 6ft from the east, but the wind is still cross and the period is short at 13 seconds. It’s still not looking good. Hold out.

Then comes Wednesday the 29th July. That’s the day. We’ve got a 10ft ENE groundswell pulsing, with a 12 second period, and the wind swings light offshore from the NW at 9 mph in the morning. That’s clean. The combined energy is a massive 2575, so there’s serious power in the water. This is for experienced surfers only—this size will be too much for beginners. By afternoon, the wind goes glassy. That’s about as good as it gets.

Thursday the 30th drops off fast. The swell drops to 6ft, the period collapses to 8 seconds, and the wind swings onshore. It’s a no-go. Then from Friday the 31st all the way through to Sunday the 9th of August, it’s a long, long stretch of poor conditions. The swell hangs around between 3ft and 7ft, but the wind is either cross, cross-on, or fresh, and the periods are short and weak. The energy drops down to the low hundreds, and it’s just not worth paddling out. For a reef break, that’s a rough run.

Honestly, that Wednesday is the only true standout. Everything else is a write-off.

Rusty.

Short Range Forecast

Light rain (total 6mm), mostly falling on Sat morning. Warm (max 26°C on Mon afternoon, min 23°C on Sun night). Mainly fresh winds.

Days 4-6 Weather Summary

Light rain (total 6mm), mostly falling on Wed night. Warm (max 27°C on Thu afternoon, min 24°C on Tue night). Wind will be generally light.

Saturday
25
Sunday
26
Monday
27
Tuesday
28
Wednesday
29
Thursday
30
Friday
31
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
2
1
2
2
2
1
1
2
1
3
4
4
2
1
0
0
0
0
0
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.9
SSW
19
1
SSW
18
1
SSW
18
1
SSW
16
1.9
ENE
8
1
E
15
1.1
E
14
1.1
E
13
1.2
E
14
1.9
E
13
1.9
E
13
2.5
ENE
13
3
ENE
12
3
ENE
11
2
ENE
9
1.8
ENE
8
1.7
ENE
8
1.9
ENE
7
2
E
8
2.1
E
8
2.3
E
8
Wave Graph
Metric surfscale
Energy kJ
627
731
662
575
452
424
478
420
515
1256
1218
2233
2360
1809
632
428
383
375
459
504
617
Wind (km/h)
30
ENE
30
NE
25
NE
25
ENE
25
ENE
25
ENE
20
ENE
25
NE
20
NE
25
NE
25
NE
20
NNE
15
NW
5
S
10
S
15
ESE
20
ENE
25
ENE
25
ENE
25
ENE
25
ENE
Wind State
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross-off
off
glassy
cross-on
on
cross-on
cross-on
cross-on
cross
cross
High Tide
2:14PM0.63m
1:16AM0.20m
2:48PM0.65m
1:57AM0.21m
3:20PM0.66m
2:33AM0.23m
3:50PM0.67m
3:10AM0.25m
4:18PM0.66m
3:49AM0.27m
4:44PM0.65m
4:33AM0.29m
5:08PM0.61m
Low Tide
10:10PM0.16m
6:48AM0.01m
10:20PM0.16m
7:31AM-0.01m
10:33PM0.16m
8:11AM-0.02m
10:50PM0.15m
8:48AM-0.01m
11:10PM0.13m
9:25AM0.00m
11:32PM0.11m
10:03AM0.04m
11:56PM0.09m
rain showers
rain showers
rain showers
rain showers
clear
clear
clear
clear
part cloud
part cloud
part cloud
part cloud
cloud
part cloud
thunderstorm
thunderstorm
clear
clear
thunderstorm
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:05
6:07
6:07
6:07
6:07
6:07
6:09
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:20
7:20
7:19
7:19
7:17
7:17
7:16
 mm
2
1
2
1
5
1
1
Temp °C
25
25
24
24
25
24
25
26
25
26
26
25
25
26
26
26
27
25
26
26
25
Feels °C
24
23
23
23
23
23
24
25
25
26
26
25
26
30
30
28
29
25
25
25
24
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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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