Ammonias Surf Break

Lat Long: 21.95° N 159.35° W

Ammonias Surf Forecast and Surf Report

Issued: 1 am 08 Jul 2026 (local time)

Forecast update in  hr  min

Today's Ammonias sea temperature is
26.3° 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 8 Jul 2026:

  • Most powerful swell: Thursday 9 Jul, 5AM (local time) - 8ft (2.4m), 8s period, ENE swell with 655 kJ wave energy.

Best Forecast Surf Conditions for Ammonias this week:

The most powerful waves expected at Ammonias in the next 16 days are 2.4m 8s and forecast to arrive on Thursday (Jul 09) at 5AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 15s period and expected on Wednesday (Jul 15) at 2AM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 5AM (Thu 9th Jul)8ft (2.4m) 8s

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


Alright, Rusty here again. Let’s break down the same stretch but in feet and miles per hour.

It’s gonna be a quiet, ugly start. From Wednesday the 8th of July through the weekend, it’s just no good. The wind is out of the ENE, blowing 15 to 19 mph as a cross or cross-onshore, and it’s making a mess of the ocean. The swell is running 6 ft to 7 ft, but it’s short-period windswell (around 8 seconds) coming from the ENE, so the waves are gonna be lumpy and un-rideable. The energy numbers are moderate (460 to 837), but that doesn’t mean anything when the wind is wrecking the surface. For a reef break like this, it’s a hard pass.

The second week gets a little more interesting. Starting around Monday the 20th of July, the swell shifts to the south and the period jumps way up to 15 to 17 seconds—that’s proper groundswell, with strong energy numbers hitting over 1,068 on Tuesday the 21st and 1,321 on Wednesday the 22nd. That’s some real power. But the wind stays a stubborn cross-onshore from the ENE at 12 mph, so the face is still gonna be choppy. On Wednesday afternoon the 22nd, the wind goes cross-shore, and that’s your best shot: a 3 ft swell at 15 seconds from the east with moderate cross-shore wind. It’s not clean, but it’s the only window that’s even close.

Bottom line: there’s nothing that really stands out. The reef needs that clean SSE swell to fire, and with all this wind, you’re better off waiting it out.

Rusty.

Short Range Forecast

Heavy rain (total 20mm), heaviest during Thu morning. Warm (max 25°C on Wed morning, min 24°C on Wed morning). Mainly fresh winds.

Days 4-6 Weather Summary

Light rain (total 9mm), mostly falling on Sat morning. Warm (max 25°C on Sat afternoon, min 23°C on Mon night). Mainly fresh winds.

Wednesday
8
Thursday
9
Friday
10
Saturday
11
Sunday
12
Monday
13
Tuesday
14
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
1
0
0
0
0
0
1
0
0
1
0
0
1
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)
2.1
ENE
8
2
ENE
8
2.3
ENE
8
2.2
ENE
8
1.9
ENE
8
2.1
ENE
7
1.9
ENE
7
1.7
ENE
7
2
ENE
7
2.1
ENE
7
1.9
ENE
8
2
ENE
7
1.9
ENE
8
1.9
ENE
8
2
ENE
8
2
ENE
8
1.8
ENE
8
1.7
ENE
7
1.7
ENE
7
1.6
ENE
8
1.7
ENE
7
Wave Graph
Metric surfscale
Energy kJ
495
464
604
570
434
443
356
297
394
475
389
423
389
403
447
439
353
294
327
270
294
Wind (km/h)
30
ENE
30
ENE
25
ENE
25
ENE
25
ENE
25
ENE
25
ENE
25
ENE
25
ENE
30
NE
25
NE
25
ENE
25
ENE
25
ENE
25
ENE
25
ENE
25
NE
20
ENE
20
ENE
25
NE
25
ENE
Wind State
cross-on
cross
cross-on
cross-on
cross-on
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
High Tide
11:53AM0.50m
8:28PM0.28m
12:45PM0.59m
9:34PM0.22m
1:33PM0.67m
11:46PM0.18m
2:19PM0.73m
1:06AM0.18m
3:04PM0.77m
2:08AM0.19m
3:47PM0.78m
3:04AM0.21m
4:29PM0.77m
3:58AM0.23m
Low Tide
6:49PM0.27m
4:28AM-0.03m
9:16PM0.22m
5:17AM-0.06m
9:34PM0.17m
6:09AM-0.08m
10:03PM0.14m
7:03AM-0.10m
10:34PM0.12m
7:55AM-0.11m
11:06PM0.11m
8:46AM-0.10m
11:38PM0.10m
rain showers
rain showers
rain showers
rain showers
rain showers
rain showers
rain showers
rain showers
rain showers
rain showers
cloud
part cloud
part cloud
rain showers
rain showers
rain showers
rain showers
part cloud
part cloud
rain showers
rain showers
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:00
6:00
6:00
6:01
6:01
6:01
6:01
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:23
7:23
7:23
7:23
7:23
7:23
7:22
 mm
1
2
3
4
2
1
1
2
4
1
2
4
1
1
1
4
Temp °C
25
25
24
25
25
24
25
25
24
24
25
24
25
25
24
24
25
24
25
25
24
Feels °C
23
23
22
24
24
23
24
24
23
23
23
23
24
24
23
23
24
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)
Map placeholder
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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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