weather forcasts,
The
Met office website has loads of usefull links from standard easy to read predictions, to maritime forecasts, mountain area forecasts and synoptic charts.
Mountain area forcasts cover the extra hill bits of the UK. These are usualy very good for general weather, cloud cover, visibility and expected outlook.
Synoptic charts. You know, the ones with the squigly lines

are relatively easy to get to grips with the basics.
Rule 1. High pressure will tend to fill a nearby low pressure but will obey rule 2.
Rule 2. Wind will rotate clockwise around a high pressure and anti-clockwise around a low. Use your left hand and point the thumb up for high and down for low... the wind follows the curve of your fingers.
Rule 3. High pressure areas have clearer skies in winter and hazey in summer.
Rule 4. Low pressure areas have dence clouds and usualy more rain.
Rule 5. Fronts will move with the winds around highs/lows and will bring cloud/rain before they pass.
Tide times
www.easytide.com The admiralty run it and the tide time charts are made by them... You can get up to 7 day predictions for most UK and many foreign ports.
Sun/moon time and bearing predictor. Change the city to the nearest location to you first.
This should help to give an idea of the bearings and time where the sun will rise and set, also the altitude that the sun will climb to.
So if you have a special location nailed for perfect composition and want the sun to co-operate, get your compass out and get a bearing. Then change the dates to find the perfect date and hope the weather plays ball!
:bonk:

Sorry its a bit dis-jointed