Paris Weather Turns Toward 28–29 °C by Week's End

Paris weather is set to swing from showers at the start of the week of May 18 to 28–29 °C by the end of the week. The shift follows a May pattern in Île-de-France that can move quickly from clouds and chill to sun and warmth.

At the Paris-Montsouris station, the 1991-2020 normals put a typical May at 15.6 °C, with average highs around 20.2 °C and lows around 11.1 °C. May also brings about 69 mm of rain on average and more than 9 days with at least 1 mm of precipitation.

Paris-Montsouris normals

The forecast sits well above those May averages by the end of the week. Paris is moving from a damp start toward a stretch that could reach the upper 20s, a range more usually associated with early summer than mid-May.

Atlantic disturbances reaching Île-de-France bring clouds, rain and a chill. High pressure returning to Île-de-France clears the sky, lets the sun warm more effectively, and raises temperatures quickly, especially in the city. Cold pockets of air aloft can destabilize the atmosphere and favor showers, sometimes thunderstorms, even when the day started well.

Météo-France comparisons

Météo-France described May 2024 as remarkably rainy and short on sunshine, with more than 15 days of rain across much of the country. May 2024 was the wettest in France since 2013.

In spring 2025, Météo-France reported an unusually hot, sunny and dry spring across the northern half of the country, ranking third among the warmest springs since 1900. The two recent seasons point in opposite directions, and May 2026 seems to lean toward alternating conditions rather than one settled pattern.

What Paris readers face

For anyone planning a week in Paris, the practical cut is simple: start with showers, then expect a quick warm-up that could reach 28–29 °C by the end of the week. That means the same city that begins the week under unsettled skies may end it feeling distinctly warm, with the forecast changing fast enough to reward checking again before heading out.