I know there are better rain-forecast sources than "hourly forecast" websites. What's the best such source? When biking, I'm not so concerned about how the temperature will fluctuate. I'm much more concerned about whether or not it will rain.

I sometimes wonder about two things: Will it rain in my city? If so, when?

Please teach me the best way to find answers.

Note:

Please don't point me to the local weather services' "hourly forecasts". They're too vague for me to completely understand, as detailed in the small print below.

My government's weather service is called Environment Canada. They publish a probability of precipitation (POP) when the likelihood of rain or snow is "maybe". They say it's the "chance that measurable precipitation [...] will fall on 'any random point of the forecast region' during the forecast period". This is confusing. But, taken together with the relevant Wikipedia article, it's understandable.

Some other weather services offer "hourly forecasts" for my city. But I don't understand their stated POPs. I did a Google search which led me to a post by Trigonal Planar. Here's a Trigonal Planar quote which I have modified to reflect my current guess at what hourly POPs mean. "The chance of rain [during] a particular [period] is 20%. But during the [period], certain hours are more or less prone towards producing said rain." This is still too confusing.

So, if you point me to a weather-forecast website, please point me to one where I can find a clear definition of each included element.
http://www.weatheroffice.gc.ca/radar/index_e.html

Use the moisture radar, it's your best tool to see when the rain is coming and when it's going with great detail. If you take the time to familiarize yourself with it you'll start to get a feel for how different types of rain look on the radar and where it's going to hit.