Grass pollen allergy warning as warm weather returns to France Sunshine and temperatures in the 20s are predicted for the weekend as are ‘high’ grass pollen counts in many departments 28 May 2021 Dry warm weather in the last weekend of May will increase pollen counts in France Pic: CKimmortal / ShutterstockBy Joanna York After weeks of grey, rainy weather Météo France has forecast sun for the final weekend of May throughout France. Anticyclonic conditions will bring dry, warm weather to France today (May 28), with “very sunny” conditions forecast throughout the country. Temperatures in the south of France are forecast to rise above seasonal averages to 19-26C.