Dark sky.
In a different league. Rain forecast is amazing.
Small fee.
Free on the website (perhaps paying would mean it remembers the things I care about – wind and rain, deg C etc?). I like it. I also like yr.no . If I really want to understand though I go for Grib files and see the detail…
If two different weather models are giving wildly different predictions either its just an indicator that the condition are too uncertain to be sure either way or you are potentially unwittingly not comparing apple with apples. e.g. is the actual location identical? are you comparing the same time period (if it will rain at 02:30-03:30 then BBC are right, but if its dry from 03:30 to 23:59 are Met Office wrong?), what do they define as “rain” – I think most meteorologists would say that even a few spits of rain for a few minutes is precipitation and therefore ticks the “it rained” box, but even if you were out all day you might not regard it as having rained – do they all use the same threshold?
To me the question is not will it rain, you are going outdoors in Wales in February I don’t need a supercomputer to tell you that you should probably go prepared for that possibility. The questions might be – how heavily will it rain? is there window in the day when it is likely to be better/worse? I think you can tell a lot more from a map too – if you see a solid band of rain coming across the whole of England and Wales – you can be pretty sure its going to rain, and the question is just when and how hard. If you see its very patchy you know it will be harder to predict, and if you see the tail end of weather is just hitting (or missing) the area you can expect possibility of error in the length/direction of the weather. Obviously the closer to the time the easier to predict. Its useful therefore to be able to see when the model was last updated, but for longer term planning I find its useful to see how consistent each model was with the last – if models every 4 hrs for the last 48 hrs have said it will rain on Sunday, there’s a good chance Sunday will be wet. if it keeps changing its mind – then I think you can infer anything its too soon to be sure.