Freiburg is one of the most southernmost cities in Germany and consequently one of its warmest. Its near-Mediterranean climate is one of the reasons that it is so popular as a vacation spot for Germans from further north. The seasons are fairly distinct; summers tend to be humid and hot (especially in the morning) while snowfall is rather common in the winter. Averages range from about 74°F (23°C) in July to 28°F (-2°C) in January, but there have been some years when temperatures have gone below 0°F (-15°C) or above 95°F (35°C). If you are visiting during the summer and the humidity and heat become too much, try going on a nature walk, as the Black Forest is well shaded from the sun.

Summer storms are rather frequent, with June through August generally being the months that see greatest precipitation (4-5 inches or about 100 cm per month). These storms tend to be heavy but short, as these are also the days with the greatest average number of sunlight hours. Freiburg lies in one of the sunniest regions in Germany, despite the rather misleading name of Black Forest. Though there is less precipitation in the winter (perhaps half as much as during the summer), skies are generally overcast.