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Surf Forecasts:
Valley Left surfForecast / Mayo and Achill Island / Ireland
12 Day Weather and Surf, issued 12 pm Wednesday 17 Sep 2025 IST
Best Forecast Surf Conditions for Valley Left this week:
The surf forecast for Valley Left over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Thursday (Sep 18) at 10AM. The primary swell is predicted to be 1.8m and 10s period. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Valley Left in the next 12 days are 1.7m 12s and forecast to arrive on Friday (Sep 19) at 1AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 5.5m 13s period and expected on Wednesday (Sep 17) at 4PM.
| Wave Type | Time (IST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 10AM (Thu 18th Sep) | 6ft (1.8m) 10s |
| Best Surf | 10AM (Thu 18th Sep) | 6ft (1.8m) 10s |
| Most Powerful | 1AM (Fri 19th Sep) | 5.5ft (1.7m) 12s |
Table - best surf conditions forecast for Valley Left over the next 12 days.
Short Range Forecast Light rain (total 8mm), mostly falling on Thu afternoon. Very mild (max 16°C on Thu night, min 12°C on Fri night). Winds decreasing (strong winds from the SW on Wed morning, calm by Fri night). | Days 3-6 Weather Summary Moderate rain (total 17mm), heaviest on Sat afternoon. Very mild (max 13°C on Sat morning, min 10°C on Sat afternoon). Winds decreasing (near gales from the NNE on Sat afternoon, light winds from the NE by Mon night). | ||||||||||||||||||||
Wednesday 17 | Thursday 18 | Friday 19 | Saturday 20 | Sunday 21 | Monday 22 | Tuesday 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) | |||||||||||||||||||||
Swell Height Map |  |  |  |  |  |  |  | ||||||||||||||
| Wave Height (m) & direction (?) | |||||||||||||||||||||
| Period(s) (?) | 11 | 13 | 16 | 10 | 9 | 12 | 12 | 10 | 10 | 11 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 9 | 8 | 13 | 12 |
Wave (?)Graph  | |||||||||||||||||||||
 kJ (?) | 0 | 0 | 51 | 615 | 264 | 920 | 636 | 0 | 320 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 8 | 41 | 0 | 0 |
Wind (km/h) | |||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- off | cross- off | cross- off | off | off | cross- off | cross- off | cross- off | off | cross- on | on | on | on | on | on | cross- on | cross- on | cross- on | cross- on | cross- on | cross |
High Tide / height (m) | 3:28PM 2.76 | 4:18AM 2.48 | 4:27PM 3.00 | 5:05AM 2.67 | 5:12PM 3.20 | 5:43AM 2.83 | 5:49PM 3.34 | 6:16AM 2.97 | 6:22PM 3.41 | 6:47AM 3.06 | 6:54PM 3.40 | 7:15AM 3.11 | 7:24PM 3.33 | ||||||||
Low Tide / height (m) | 10:08PM 0.69 | 10:09AM 0.87 | 10:57PM 0.46 | 10:55AM 0.65 | 11:35PM 0.27 | 11:32AM 0.46 | 12:07AM 0.14 | 12:06PM 0.33 | 12:36AM 0.08 | 12:38PM 0.26 | 1:04AM 0.08 | 1:09PM 0.24 | 1:31AM 0.15 | ||||||||
Wednesday 17 | Thursday 18 | Friday 19 | Saturday 20 | Sunday 21 | Monday 22 | Tuesday 23 | |||||||||||||||
| Sunrise | 7:15 | - | - | 7:16 | - | - | 7:18 | - | - | 7:20 | - | - | 7:22 | - | - | 7:24 | - | - | 7:26 | - | - |
| Sunset | - | 7:52 | - | - | 7:49 | - | - | 7:46 | - | - | 7:45 | - | - | 7:42 | - | - | 7:39 | - | - | 7:37 | - |
 | |  |  |  |  | | |  | |  | | | | | | | | |  | | |
Rain (mm) | - | - | - | - | 3 | 2 | - | - | 3 | 3 | 9 | 4 | - | - | 1 | - | - | - | - | - | - |
| Temp. °C | 15 | 14 | 14 | 14 | 15 | 16 | 14 | 14 | 13 | 13 | 11 | 11 | 11 | 11 | 12 | 12 | 12 | 11 | 13 | 13 | 12 |
| Feels °C (?) | 7 | 5 | 6 | 13 | 13 | 11 | 8 | 8 | 9 | 10 | 1 | -1 | 0 | 1 | 4 | 5 | 5 | 6 | 9 | 8 | 9 |
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Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
Recent Eyeball Surf Reports for Mayo and Achill Island
The wind is still cross-off at Valley Left (strong winds from the SW at Belmullet 23 km from Valley Left). No surfable waves
23 km away, 1 h 26 min ago
FREE! Surf-Forecast.com widget for your website
The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Valley Left surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
Information about the Valley Left Surf forecast
The above surf forecast table for Valley Left provides essential information for determining whether the surfing conditions will be good over the next 12 days. A general guide to surfing at Valley Left can be found by selecting the local surf guide option on the grey menu. Our Valley Left 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 (Valley Left) 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 Valley Left 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.
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