While I was in class today, I heard thunder and saw pouring rain outside the windows. It was only an hour before the end of class, so I was a bit worried, since I walk to and from school to save money (Métro tickets are expensive—even with part of the price of a weekly pass paid by my employer, I still can't afford them). Fortunately, the rain let up before class was over, and I was able to walk home without an umbrella, albeit underneath a dense overcast.
I could see the thunderstorm to the east, still dumping tons of rain on the suburbs, with occasional lightning. Thunderstorms are rare in Paris, so they offer a change of pace, as long as the power doesn't go off (but it almost never does, since all utilities are underground). Most rain in Paris is light, misty rain that comes and goes.
This type of weather is a foretaste of April in Paris, when the skies are generally deep blue with white fluffy clouds, occasionally interrupted by brief rain showers. It's usually very nice weather (although it has been getting hotter and hotter in recent years), and if you visit at this time of year, you understand why people rave about April in Paris. But I'll let you in on a little secret: October is just as nice.