Ammonias Surf Break

Lat Long: 21.95° N 159.35° W

Ammonias Surf Forecast and Surf Report

Issued: 1 am 09 Aug 2026 (local time)

Forecast update in  hr  min

Today's Ammonias sea temperature is
26.6° C
0.0° 

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


Ammonias surf forecast from 9 Aug 2026:

  • Most powerful swell: Sunday 16 Aug, 8AM (local time) - 8ft (2.5m), 13s period, ENE swell with 2,233 kJ wave energy.

Best Forecast Surf Conditions for Ammonias this week:

The most powerful waves expected at Ammonias in the next 16 days are 2.5m 13s and forecast to arrive on Sunday (Aug 16) at 8AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.3m 12s period and expected on Thursday (Aug 13) at 2AM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 8AM (Sun 16th Aug)8ft (2.5m) 13s

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


The Lowdown

Right, let’s have a look at the next couple of weeks for Ammonias. It’s a reef setup, fairly consistent, but honestly, the forecast is a bit of a mixed bag to start. We’ve got a lot of cross-shore energy and onshore breezes messing things up for the first few days, so don’t get too keen. The water temp is sitting around 80°, which is about average for this time of year, so nothing weird there.

The first real window of decent surf looks like it arrives on the 16th of August. The swell jumps up to 8ft to 10ft from the ENE, with a solid period of 12-13 seconds. It’s a bit of a beast, so this is one for the experienced crew, not the learners. The wind is offshore, which is a big plus, and it should be clean. The energy is strong too, at 4174. That’s the standout of the week, but it’s still a bit raw.

The morning of the 17th, Monday, is the real gem though. The swell holds at 10ft from the ENE, but the wind swings light offshore from the NNW, and the energy is still pumping at 2218. This is the one to circle on the calendar. It’s going to be big, powerful, and clean. After that, it drops off quickly, back down to under 3ft, and the wind swings around, making things messy again.

The second week is a bit of a write-off to be honest. The swell tries to pick up again around the 22nd and 23rd, with some 5ft to 8ft ENE swell, but the wind is all over the place, cross-on and choppy. It’s not worth getting excited about. There are a few pulses of longer period SSW swell, but they’re small and the wind ruins the surface. The 23rd has a risk of thunderstorms, and the swell is short period, so it’s going to be a messy, lumpy mess.

Overall, the middle of the month is where it’s at. The 16th and 17th are your best shots for a proper wave. After that, it fades out. Keep your eyes on the charts, because the energy is there, but the wind is going to be the deciding factor.

Rusty.

Short Range Forecast

Light rain (total 4mm), mostly falling on Sun night. Warm (max 27°C on Sun afternoon, min 24°C on Sun night). Wind will be generally light.

Days 4-6 Weather Summary

Mostly dry. Warm (max 27°C on Thu morning, min 24°C on Wed night). Wind will be generally light.

Sunday
9
Monday
10
Tuesday
11
Wednesday
12
Thursday
13
Friday
14
Saturday
15
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
1
1
1
1
1
0
1
0
0
2
2
2
1
1
0
0
1
0
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)
1.6
ENE
7
1.5
ENE
7
0.7
SSW
16
0.7
SSW
16
0.7
SSW
15
0.7
SSW
15
0.7
SSW
15
0.8
SSW
14
0.7
S
20
0.9
S
18
1.1
S
18
1.5
S
16
1.4
S
16
1.4
S
15
1.3
S
15
1.2
S
14
1.1
S
14
1.1
S
14
1.9
ENE
9
2.2
ENE
11
2.5
ENE
13
Wave Graph
Metric surfscale
Energy kJ
233
210
263
259
234
231
222
269
373
515
741
1178
1004
906
743
598
489
476
579
1113
2190
Wind (km/h)
25
ENE
20
ENE
20
ENE
20
ENE
20
ENE
20
ENE
15
ENE
20
ENE
15
ENE
25
ENE
25
NE
20
NE
25
NE
25
NE
25
NE
25
ENE
25
ENE
25
NE
30
NE
30
NE
20
NE
Wind State
cross-on
cross
cross
cross
cross
cross
cross-on
cross
cross-on
cross-on
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
High Tide
2:05PM0.73m
1:24AM0.22m
2:47PM0.75m
2:17AM0.26m
3:26PM0.74m
3:06AM0.30m
4:02PM0.71m
3:54AM0.34m
4:34PM0.66m
4:44AM0.37m
5:03PM0.59m
5:36AM0.41m
5:29PM0.52m
Low Tide
9:35PM0.15m
7:01AM-0.05m
9:56PM0.13m
7:54AM-0.06m
10:20PM0.12m
8:43AM-0.04m
10:44PM0.10m
9:30AM-0.00m
11:09PM0.08m
10:17AM0.05m
11:35PM0.07m
11:06AM0.12m
00:00AM0.06m
part cloud
clear
rain showers
rain showers
rain showers
clear
clear
clear
part cloud
part cloud
clear
part cloud
part cloud
clear
part cloud
part cloud
clear
part cloud
part cloud
part cloud
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:11
6:13
6:13
6:13
6:13
6:13
6:15
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:12
7:10
7:10
7:09
7:08
7:08
7:07
 mm
1
2
1
Temp °C
26
27
25
26
26
25
27
27
25
26
26
25
27
27
25
26
26
25
27
27
25
Feels °C
26
27
25
27
26
26
28
27
25
25
25
24
26
26
24
25
24
25
25
25
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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