The warmest time of the year ensures perfect weather for your trip to Paris. June promises comfortable temperature around 20 °C without heat and humidity. Throughout June about 25 mm of rainfall occurs during 11 days. The beginning of the month is particularly rainy, but rainfall decreases towards the end of the month. At the same time, thunderstorm season starts usually around June 24th.
July is the hottest month of the year with the maximum of sunshine. Extreme heat waves are possible during this time. It rains less often than during June, but the probability of thunderstorms is higher. You will probably encounter a few rainy days during your stay.
August is the driest month of the year. However this month still has about ten rainy days, so you will need an umbrella. Thunderstorms also regularly occur in August.