Heidelberg is one of the warmest cities in Germany. It has pleasant oceanic climate in the city. Summers are warm in the months from May to September with hottest climate in July and August. The average high temperature in summers in Heidelberg varies from 22°C / 72°F to 30°C / 86°F. The city faces often-heavy rain showers at times.
The winters in Heidelberg are rarely extreme. You can see the overnight frosts particularly in the months of December, January and February. The average low temperature in winters in Heidelberg varies in between 1.5°C / 29°F to 14°C / 57°F. The average annual precipitation in the city is approximately 2.5 in. The best season to visit the beautiful city of Heidelberg is spring and autumn with clear sky, warm days and appealing fine weather.