Nazare Big Wave Challenge Gets Yellow Alert, Could Run Saturday in Giant Waves
70-foot plus waves predicted for Portuguese big wave tow surfing competition.
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Mera surfForecast / Chiba / Japan
12 Day Weather and Surf, issued 2 pm Tuesday 16 Dec 2025 JSTForecast update in hr min s Forecast update imminent
Mera surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Mera sea temperature is
19.9° C
(Which is normal for this time of year)Best Forecast Surf Conditions for Mera this week:
The surf forecast for Mera over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Wednesday (Dec 17) at 6AM. The primary swell is predicted to be 1.6m and 6s period with a secondary swell of 0.9m and 6s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Mera in the next 12 days are 2.5m 8s and forecast to arrive on Sunday (Dec 21) at 6PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 3.0m 9s period and expected on Monday (Dec 22) at 9AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6AM (Wed 17th Dec) | 5ft (1.6m) 6s |
| Best Surf | 6AM (Wed 17th Dec) | 5ft (1.6m) 6s |
| Most Powerful | 6PM (Sun 21st Dec) | 8ft (2.5m) 8s |
Table - best surf conditions forecast for Mera over the next 12 days.
Updates in hr min s Forecast update imminent
Short Range Forecast Mostly dry. Very mild (max 15°C on Wed night, min 10°C on Wed night). Winds increasing (light winds from the WSW on Tue afternoon, strong winds from the WSW by Wed afternoon). | Days 3-6 Weather Summary Heavy rain (total 35mm), heaviest during Sun night. Very mild (max 19°C on Sat afternoon, min 11°C on Mon morning). Winds increasing (calm on Fri afternoon, near gales from the NNE by Mon morning). | ||||||||||||||||||||||
Tue 16 | Wednesday 17 | Thursday 18 | Friday 19 | Saturday 20 | Sunday 21 | Monday 22 | |||||||||||||||||
| PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | |||
Rating (10 max) | |||||||||||||||||||||||
Swell Height Map |  |  |  |  |  |  |  |  | |||||||||||||||
| Wave Height (m) & direction (?) | |||||||||||||||||||||||
| Period(s) (?) | 6 | 7 | 6 | 6 | 6 | 6 | 6 | 6 | 5 | 5 | 4 | 4 | 5 | 6 | 6 | 7 | 8 | 9 | 9 | 9 | 8 | ||
Wave (?)Graph  | |||||||||||||||||||||||
 kJ (?) | 40 | 142 | 167 | 193 | 148 | 30 | 17 | 7 | 28 | 20 | 34 | 32 | 61 | 126 | 329 | 628 | 572 | 365 | 300 | 189 | 118 | ||
Wind (km/h) | |||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- on | cross | cross- off | cross- on | cross- on | off | off | off | off | glass | cross- on | cross- on | cross- on | cross- on | on | on | cross- on | off | off | cross- off | cross- off | ||
High Tide / height (m) | 3:52AM 1.22 | 1:53PM 1.37 | 4:32AM 1.29 | 2:32PM 1.40 | 5:08AM 1.33 | 3:08PM 1.42 | 5:42AM 1.36 | 3:43PM 1.43 | 6:17AM 1.37 | 4:17PM 1.44 | 6:51AM 1.36 | 4:51PM 1.43 | 7:25AM 1.35 | ||||||||||
Low Tide / height (m) | 8:42PM 0.26 | 8:29AM 0.94 | 9:18PM 0.16 | 9:16AM 0.95 | 9:53PM 0.08 | 9:58AM 0.94 | 10:27PM 0.03 | 10:36AM 0.94 | 11:01PM -0.01 | 11:11AM 0.93 | 11:35PM -0.02 | 11:46AM 0.92 | 12:10AM -0.02 | ||||||||||
Tue 16 | Wednesday 17 | Thursday 18 | Friday 19 | Saturday 20 | Sunday 21 | Monday 22 | |||||||||||||||||
| Sunrise | - | - | 6:41 | - | - | 6:41 | - | - | 6:41 | - | - | 6:43 | - | - | 6:43 | - | - | 6:43 | - | - | 6:43 | ||
| Sunset | 4:30 | - | - | 4:30 | - | - | 4:30 | - | - | 4:30 | - | - | 4:31 | - | - | 4:31 | - | - | 4:32 | - | - | ||
 |  |  | | | |  |  | | |  | | | |  |  |  | | | |  | |||
Rain (mm) | - | - | - | - | - | - | - | - | - | - | 1 | - | - | 3 | 5 | 9 | 17 | - | 8 | 24 | 1 | ||
| Temp. °C | 12 | 12 | 12 | 14 | 15 | 12 | 12 | 12 | 12 | 14 | 18 | 18 | 19 | 19 | 18 | 18 | 18 | 11 | 10 | 8 | 10 | ||
| Feels °C (?) | 9 | 8 | 8 | 5 | 6 | 6 | 7 | 8 | 9 | 14 | 12 | 12 | 13 | 13 | 13 | 14 | 15 | 1 | 0 | -4 | 0 | ||
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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 Mera 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.
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Information about the Mera Surf forecast
The above surf forecast table for Mera provides essential information for determining whether the surfing conditions will be good over the next 12 days. A general guide to surfing at Mera can be found by selecting the local surf guide option on the grey menu. Our Mera 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 (Mera) 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 Mera 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.
Mera is 9 km (6 miles) from Tateyama. If you plan a holiday in Chiba, look for hotels and other accommodation in Tateyama. Tateyama has rooms for a wide range of budgets as well as car hire and transport links.
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