I prefer this one but it is important to use it right I think.
When you get to the page type in your postcode and click go. Then use the "hour by hour" tab.
It has a few nice things.
Dew point = the temperature at which dew forms. The dew point will never be higher than the actual temperature. If the temperature is at Dew Point then dew must form. More importantly, the higher the Dew Point the more moisture is in the air (get through more scrims n cloths).
Precipitation. = The percentage chance of something wet falling from the sky. Geerally if it is...
below 20% it means "there is only a very slight chance it could rain"
30% - 50% means "there is chance it could rain"
60% - 80% means "it is likely to rain"
above 80% means is as good as saying "it is definitly going to rain"
and the website, nearly forgot...
www.weather.co.uk