Ammonias Surf Break

Lat Long: 21.95° N 159.35° W

Ammonias Surf Forecast and Surf Report

Issued: 7 am 17 Jul 2026 (local time)

Forecast update in  hr  min

Today's Ammonias sea temperature is
26.5° 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 17 Jul 2026:

  • Most powerful swell: Thursday 23 Jul, 8PM (local time) - 3.5ft (1.0m), 19s period, SSW swell with 708 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 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 0.6m 14s period and expected on Friday (Jul 17) at 11AM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 8PM (Thu 23rd Jul)3.5ft (1.0m) 19s

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


The Lowdown

Righto, let’s cut through the chatter. I’m Rusty, and I’ve had a look at Ammonias for the next 16 days. I’ll be straight with you – it’s a quiet stretch. The first few days are a write-off; from Friday 17 July right through to the end of the month, the conditions are pretty ordinary. The wind is mostly cross or cross-on from the ENE, and the swell is short-period, messy stuff. The energy is moderate at best, climbing to strong later in the run, but the quality just isn’t there for a proper paddle. You’ve got a consistent cross-chop, and the wave comment is consistently “poor surf conditions” for the first week and a half. It’s a reef setup, so it’s exposed, but with the wind all wrong and the swell direction not lining up with the optimum SSE, it’s a tough one. Water temperature is sitting at 80°, which is pretty average for this time of year – no anomaly to speak of.

The real glimmer, the only true standout, doesn’t show up until Saturday 1 August. That morning, the wind swings around to a light NNE at 9 mph, giving you a clean, cross-off breeze. The swell is small, only 2 ft, but it’s a long-period 15-second groundswell from the SW, which is a better direction for this reef. Energy is weak (141), but it’s clean. That’s the best on offer – a small, clean window. After that, the afternoon brings back the cross-shore ENE wind and a bumpy 4 ft short-period swell. So, for the whole 16 days, you’ve got a long gap of flat, poor conditions, then one promising morning. Don’t get your hopes up too much for the long-range stuff; it’s a marginal forecast at best. Crowds are often a thing here, so if you do go for that Saturday morning, expect company.

Rusty.

Short Range Forecast

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

Days 4-6 Weather Summary

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

Friday
17
Saturday
18
Sunday
19
Monday
20
Tuesday
21
Wednesday
22
Thursday
23
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
1
0
0
0
0
0
0
1
1
1
0
0
1
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)
1.4
ENE
7
1.5
ENE
7
1.5
ENE
7
1.6
ENE
7
1.8
ENE
7
1.7
ENE
7
1.5
ENE
8
1.4
ENE
8
1.5
ENE
8
1.3
ENE
8
1.3
ENE
8
1.3
ENE
7
0.8
S
15
0.9
S
14
1
S
13
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
180
196
198
239
319
327
246
226
250
191
188
172
275
316
347
437
426
480
528
399
469
Wind (km/h)
20
ENE
20
ENE
20
ENE
25
ENE
25
ENE
20
ENE
20
ENE
20
NE
20
ENE
20
ENE
20
NE
15
NE
20
ENE
20
ENE
20
ENE
20
ENE
20
ENE
20
ENE
20
ENE
25
ENE
25
ENE
Wind State
cross
cross
cross-on
cross-on
cross
cross
cross
cross
cross
cross-on
cross
cross
cross
cross
cross-on
cross-on
cross
cross-on
cross-on
cross-on
cross-on
High Tide
6:18PM0.59m
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
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
4:16AM0.04m
clear
clear
part cloud
rain showers
clear
part cloud
clear
clear
clear
clear
clear
clear
clear
clear
rain showers
rain showers
clear
rain showers
part cloud
part cloud
rain showers
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:03
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
3
2
1
1
Temp °C
26
26
25
26
26
25
25
26
24
25
26
24
25
26
24
25
26
24
26
26
25
Feels °C
26
26
25
26
25
25
24
25
22
24
26
24
24
25
24
25
26
23
26
24
24
  • 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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