Aaaaaah, Parisian weather. Is there anything less predictable? Typically, Paris experiences 4 seasons, much like the northeastern part of the US (although without the extremes). Spring time in Paris is usually a crapshoot – you’re just as likely to get a perfect sunny day as you are to experience a gray, rainy day. Fortunately, while it may drizzle in Paris, it is usually quite comfortable temperature-wise.
Summertime in Paris ranges from the rainy days of June to an occasional heat wave in August. Fall in Paris can be quite comfortable, and without the mobs of tourists. Winter in Paris, though gloomy, is quite manageable temperature-wise, provided you have the customary Parisian scarf around your neck to keep you warm.