The Global FlyFisher
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For your comfort when sea trout fishing you'll want a light wind from any direction or a heavier wind blowing away from the shore. Fish will be there in any wind and hard winds will often bring bigger fish that bite harder, but fishing can be tricky and tiring.
Very few Danish salt water fishers will believe that this kind of weather brings fish. This morning was a blank, but as soon as the sun cleared the fog, a light wind riffled the surface, at there was activity.
Light or off shore wind
For your comfort you'll want a light wind from any direction or a heavier wind blowing away from the shore. Fish will be there in any wind and hard winds will often bring bigger fish that bite harder, but fishing can be tricky and tiring.
Riffeled water is good
The best FF-water is riffeled or with light non-breaking waves. Harder waves can be fished, but again it can be tricky and there will be a lot of loose weed in the water under these conditions. A surface as a mirror is exciting, but difficult too, but will have less influence at night.
Fishing the ocean means fishing under a great influence of wind and weather. A change in winds can change a good looking day into a disaster and you will find yourself unable to recognize known places because of different winds.
My own experience tells me that wind that brings water away from the shore is normally best. This is not necessarily the same as wind blowing away from the shore, but often will be. Local conditions, tide and currents might mean that even an on shore wind can move water away.
Try a head wind
Especially spring and autumn a light head on wind can make a day. This wind will move bottom material around in the water and create good conditions for feeding fish. Harder wind can be even better, but as I mentioned, trying to cast a fly into it can be hopeless.
Cloud cover is another factor to consider. When fishing in daylight a shifting cover with the sun peeking in from time to time is to prefer. Darker skies can be good in spring and autumn, but in the winter a clear blue sky with sun is often a must.
Come rain, come shine...
Rain doesn't influence the fishing much, but if you're properly dressed you can fish through rain with luck. Often the breaking of the surface by the drops will bring action in baitfish and food and the trout will follow.