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Fjaltring wave buoy daily means for Sep 2025

Daily means from the Fjaltring wave buoy for Sep 2025, including available wave height, period, direction, wind and sea temperature data.

Last observation shown

Data available:  to 

Monthly means for

Latest

Period Summary

Programmatically generated summary. Hog Says

1,227 wave-buoy observations covered 26 of 30 days (87%). Typical wave height was 3.6 ft (10th–90th percentile 0–8.2 ft), while mean average of more than one wave period type was 4.7 seconds (10th–90th percentile 3.5–6.3 seconds). 4 of 3,681 checked values (0.1%) were excluded by quality control. Across 15 comparable years, mean wave height was the same as the same-month mean of 3.9 ft and mean wave period was the same as the same-month mean of 4.7 seconds.

Generated only from the observations and comparisons shown on this page.

Typical Significant Wave Height

3.6ft
Mean: 3.9 ft
P10–P90: 0 — 8.2 ft
Recorded extremes

0 — 11.4 ft

Mean Observed Wave Period

4.7secs
P10–P90: 3.5 — 6.3secs
Recorded extremes

2.6 — 7.4secs

Typical Observed Wind

-, -mph
Mean: - mph
P10–P90: - — - mph

Available for 0 of 614 hourly samples

Mean Water Temperature

-°C
P10–P90: - — -°C

Available for 0 of 614 hourly samples

Compared With Previous Septembers

Historical baseline from 19,878 observations across 15 years.

Wave Height
3.9ft
0ft below mean
Historical mean 3.937ft
Wave Period
4.7s
In line with the historical mean
Historical mean 4.7s
Water Temperature
–
Not enough comparable data

Chart showing grouped wave observations for Fjaltring. Use the table on this page for a text version of the same measurements. To open hourly observations, use a linked day name in the table.

About Fjaltring wave buoy

Fjaltring is a Danish Coastal Authority directional buoy off the exposed central west coast of Jutland. The authority has maintained a continuous wave-measurement programme here since 1980, creating a key reference for Denmark's most erosion-prone coast and the long-running Lodbjerg–Nymindegab protection works.

Its current data source reports wave height, wave period and wave direction.

Metrics are rows; days run left to right.
Fjaltring wave buoy daily means Sep 2025Last observation shown
Metric
Mean significant wave height (ft)33554322213553797764880000----
Mean average wave height (ft)------------------------------
Mean maximum wave height (ft)4678642422688511141210106131201------
Mean average period (s)4445443443445456555456--------
Mean zero-crossing period (s)44444433434454565554556776----
Mean maximum wave period (s)------------------------------
Mean peak wave directionWSWconcentration 100%SWconcentration 99%SWconcentration 99%SWconcentration 100%WSWconcentration 100%WSWconcentration 99%WSWconcentration 73%SSWconcentration 99%WSWconcentration 92%Wconcentration 82%SWconcentration 98%WSWconcentration 100%WSWconcentration 99%WSWconcentration 100%SWconcentration 97%Wconcentration 95%Wconcentration 99%WSWconcentration 99%Wconcentration 99%WSWconcentration 97%Wconcentration 79%NWconcentration 99%NWconcentration 44%Variableconcentration 21%Variableconcentration 24%NWconcentration 39%----

Swipe sideways to see more days.

Wave metric colour key

Colours move through the scale as each number increases. They do not by themselves mean that conditions are good, safe or suitable for you.

Wave & swell height0–40+ ft
Wave & swell period0–22+ s
Wind speed0–75 mph

The displayed numbers remain the source of truth; colour is an additional visual cue.

What does buoy wave power mean?

kW/m means kilowatts of wave power per metre of wave crest. It describes the rate at which the observed sea state carries energy past the buoy.

Unlike the shore-directed forecast value, buoy wave power is the total power at the observation point. It is not projected towards a particular beach and does not predict breaking wave height.

In deep water, wave power can be calculated with:

P is approximately 0.49 times significant wave height squared times wave energy period.

P is power in kW/m, Hs is significant wave height in metres, and Te is wave energy period in seconds.

  • Provider-reported power is used when available.
  • Otherwise, a value is calculated only when both significant height and a genuine energy period are available. The ≈ symbol marks calculated values.
  • A dash is shown instead of substituting peak, Tm02, zero-crossing or other period measurements.
  • Daily and monthly figures use the mean of hourly-normalized observation power values; they are not calculated from mean height and period.

Wave direction, spectrum, water depth and local bathymetry still matter. Wave power is best read alongside height, period and direction rather than as a standalone surf-quality score.

The observation data displayed on this page is from the Danish Coastal Authority wave-measurement network.

Learn how SurfHog combines, checks and summarizes observations in the data and methodology notes.

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