The climate of Grosseto is Mediterranean, with mild, relatively rainy winters and hot, sunny summers.
The city is located 10 kilometers (6 miles) away from the coast of the Tyrrhenian Sea, in the Tuscany region, and has a climate similar to that of Rome, although a little more windy and a little less rainy.
The average temperature of the coldest month (January) is of 7.4 °C (45 °F), that of the warmest month (August) is of 24.5 °C (76 °F). Here are the average temperatures.
Grosseto - Average temperatures
Min (°C)335711141718151284
Max (°C)121316192428313127221713
Min (°F)373741455257636459544639
Max (°F)545561667582888881726355

Precipitation amounts to 655 millimeters (25.8 inches) per year: so, it is at an intermediate level. It ranges from 15 mm (0.6 in) in the driest month (July) to 100 mm (3.9 in) in the wettest (November). Here is the average precipitation.
Grosseto - Average precipitation

On average, there are around 2,480 sunshine hours per year. Here are the average sunshine hours per day.
Grosseto - Sunshine

The sea temperature in Marina di Grosseto ranges between 14 °C (57 °F) and 25 °C (77 °F). The sea is warm enough for swimming from July to September. Here are the average sea temperatures.
Grosseto - Sea temperature
Temp (°C)141414151822242523211816
Temp (°F)575757596472757773706461


Best Time

The best times to visit Grosseto are spring and autumn, ie from mid-April to mid-June and from September to early October. In June, the weather is often nice, but it can sometimes be hot, especially in the second half of the month.
The best months to go to the beach are July and August. In June, the sea is still a little cool.