Climate - Grosseto (Tuscany)

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, in the area called Maremma, 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 7.8 °C (46 °F), that of the warmest month (August) is of 25.1 °C (77 °F). Here are the average temperatures.

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.

Winter, from December to February, is mild.
There is a moderate amount of sunny days, which can be mild, with highs around 12/15 °C (54/59 °F), but it often gets cold at night, with lows around freezing (0 °C or 32 °F) or slightly above. Cloudy periods, accompanied by wind and rain, are milder, especially at night, both because of the southern wind, which usually blows in periods of bad weather, and of cloud cover, which is able to prevent nocturnal cooling.
The wind from the north, the tramontana, brings cold and sunny days, with highs below 10 °C (50 °F) and possible light frosts at night. Sometimes, there can be particularly cold days, in which the maximum remains around 3/4 °C (37/39 °F) despite the sun.
On the coldest nights of the year, the temperature typically drops to -2/-4 °C (25/28 °F), but can sometimes drop lower.
The temperature dropped to -9.5 °C (15 °F) in February 1956, to -8.5 °C (16.5 °F) in January 1968, to -13 °C (8.5 °F) in January 1985, to -9.5 °C (15 °F) in January 1987, to -13 °C (8.5 °F) in February 1991, to -9.5 °C (15 °F) in December 1996, and to -9 °C (16 °F) in late February 2018.
Snow in Grosseto is a very rare phenomenon because, as we mentioned, cold periods are usually sunny. Sometimes, however, quite heavy snowfalls may occur, for example, in December 1996, 30 cm (12 in) of snow fell.

Summer, from June to August, is hot and sunny, with rare thunderstorms. During the day it is hot, although a moderate mistral wind blows in the afternoon.
Sometimes, however, there can be particularly hot and muggy periods. On the hottest days of the year, the temperature exceeds 35 °C (95 °F).
The highest record, 40 °C (104 °F), was recorded in the months of August of 1958, 2003 and 2017. On other occasions, the temperature reached 39 °C (102 °F) in the months of August 1974, 1981 and 1999, in June 2003, and in July 2004 and 2018.



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

The sea temperature in Marina di Grosseto ranges between 13.5 °C (56 °F) and 25 °C (77 °F). The sea is warm enough for swimming from July to September. Here are the average sea temperatures.

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.

Grosseto - Weather by month

Based on the period 1991-2020

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In January, the coldest month of the year, the weather in Grosseto is usually quite mild. The average temperature is of 7.8 °C (46 °F), with a minimum of 2.9 °C (37.2 °F) and a maximum of 12.7 °C (54.9 °F).
On the coldest nights of the month, the temperature usually drops to around -3.5 °C (26 °F). However, it dropped to -7.2 °C (19 °F) in January 2000.
On the warmest days of the month, the temperature usually reaches around 17.5 °C (64 °F). However, it reached 19.4 °C (66.9 °F) in January 2002.
Precipitation amounts to 50 mm (2 in), distributed over 6 days.
The day lasts on average 9 hours and 30 minutes.
There are on average 4 hours of sunshine per day. So, the sun shines 44% of the time.
The average humidity is 76%. Hence, the air is normally humid.
The average wind speed is 13 kph (8 mph).
The average sea temperature is of 14 °C (57.5 °F). Therefore, the sea is very cold for swimming.

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In February, the weather in Grosseto is usually quite mild. The average temperature is of 8.2 °C (47 °F), with a minimum of 2.7 °C (36.8 °F) and a maximum of 13.7 °C (56.7 °F).
On the coldest nights of the month, the temperature usually drops to around -3.5 °C (25.5 °F). However, it dropped to -13 °C (8.6 °F) in February 1991.
On the warmest days of the month, the temperature usually reaches around 18.5 °C (65.5 °F). However, it reached 22.8 °C (73 °F) in February 2019.
Precipitation amounts to 50 mm (2 in), distributed over 5 days.
The day lasts on average 10 hours and 35 minutes.
There are on average 4.5 hours of sunshine per day. So, the sun shines 43% of the time.
The average humidity is 72%. Hence, the air is normally humid.
The average wind speed is 14 kph (9 mph).
The average sea temperature is of 13.5 °C (56.5 °F). Therefore, the sea is very cold for swimming.

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In March, the weather in Grosseto is usually mild. The average temperature is of 10.7 °C (51 °F), with a minimum of 5 °C (41 °F) and a maximum of 16.4 °C (61.4 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around -1 °C (30.5 °F). However, it dropped to -5 °C (23 °F) in March 2005.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 21 °C (70 °F). However, it reached 27.6 °C (81.7 °F) in March 1991.
Precipitation amounts to 50 mm (2 in), distributed over 6 days.
The day lasts on average 12 hours and 0 minutes.
There are on average 5.5 hours of sunshine per day. So, the sun shines 46% of the time.
The average humidity is 72%. Hence, the air is normally humid.
The average wind speed is 15 kph (9 mph).
The average sea temperature is of 14 °C (57 °F). Therefore, the sea is very cold for swimming.

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In April, the weather in Grosseto is usually mild. The average temperature is of 13.3 °C (56 °F), with a minimum of 7.3 °C (45.1 °F) and a maximum of 19.3 °C (66.7 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around 1.5 °C (34.5 °F). However, it dropped to -2.4 °C (27.7 °F) in April 2003.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 25 °C (77 °F). However, it reached 29.4 °C (84.9 °F) in April 2018.
Precipitation amounts to 50 mm (2 in), distributed over 6 days.
The day lasts on average 13 hours and 25 minutes.
There are on average 7 hours of sunshine per day. So, the sun shines 51% of the time.
The average humidity is 72%. Hence, the air is normally humid.
The average wind speed is 13 kph (8 mph).
The average sea temperature is of 15 °C (59 °F). Therefore, the sea is cold for swimming.

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In May, the weather in Grosseto is usually very mild. The average temperature is of 17.5 °C (64 °F), with a minimum of 11.3 °C (52.3 °F) and a maximum of 23.8 °C (74.8 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around 6.5 °C (43.5 °F). However, it dropped to 1.6 °C (34.9 °F) in May 2019.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 29 °C (84.5 °F). However, it reached 34 °C (93.2 °F) in May 2005.
Precipitation amounts to 35 mm (1.4 in), distributed over 4 days.
The day lasts on average 14 hours and 40 minutes. So the days are long.
There are on average 8 hours of sunshine per day. So, the sun shines 55% of the time.
The average humidity is 69%.
The average wind speed is 12 kph (7 mph).
The average sea temperature is of 18 °C (64.5 °F). Therefore, the sea is cold for swimming.

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In June, the weather in Grosseto is usually warm. However, there are remarkable differences between night and day. The average temperature is of 21.7 °C (71 °F), with a minimum of 15 °C (59.1 °F) and a maximum of 28.3 °C (83 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around 10 °C (50 °F). However, it dropped to 6.8 °C (44.2 °F) in June 2005.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 33.5 °C (92.5 °F). However, it reached 39 °C (102.2 °F) in June 2003.
Precipitation amounts to 30 mm (1.2 in), distributed over 2 days.
The day lasts on average 15 hours and 20 minutes. So the days are long. June 21, the summer solstice, is the longest day of the year in the Northern Hemisphere.
There are on average 9.5 hours of sunshine per day. So, the sun shines 62% of the time.
The average humidity is 65%.
The average wind speed is 12 kph (7 mph).
The average sea temperature is of 21.5 °C (70.5 °F). Therefore, the sea is cool for swimming.

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In July, the weather in Grosseto is usually warm to hot. However, there are remarkable differences between night and day. The average temperature is of 24.6 °C (76 °F), with a minimum of 17.8 °C (64.1 °F) and a maximum of 31.4 °C (88.4 °F).
On the coldest nights of the month, the temperature usually drops to around 13.5 °C (56.5 °F). However, it dropped to 8.8 °C (47.8 °F) in July 1993.
On the warmest days of the month, the temperature usually reaches around 36 °C (96.5 °F). However, it reached 39 °C (102.2 °F) in July 2004.
Precipitation amounts to 15 mm (0.6 in), and all occurs in one day.
The day lasts on average 14 hours and 55 minutes. So the days are long.
There are on average 11 hours of sunshine per day. So, the sun shines 72% of the time.
The average humidity is 62%.
The average wind speed is 12 kph (8 mph).
The average sea temperature is of 24.5 °C (76 °F). Therefore, the sea is warm enough for swimming.

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In August, the hottest month of the year, the weather in Grosseto is usually warm to hot. However, there are remarkable differences between night and day. The average temperature is of 25.1 °C (77 °F), with a minimum of 18.5 °C (65.3 °F) and a maximum of 31.7 °C (89 °F).
On the coldest nights of the month, the temperature usually drops to around 14 °C (57 °F). However, it dropped to 10.6 °C (51.1 °F) in August 2006.
On the warmest days of the month, the temperature usually reaches around 36.5 °C (97.5 °F). However, it reached 40.2 °C (104.4 °F) in August 2003.
Precipitation amounts to 20 mm (0.8 in), distributed over 2 days.
The day lasts on average 13 hours and 50 minutes.
There are on average 10 hours of sunshine per day. So, the sun shines 71% of the time.
The average humidity is 65%.
The average wind speed is 12 kph (8 mph).
The average sea temperature is of 25 °C (77.5 °F). Therefore, the sea is warm enough for swimming.

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In September, the weather in Grosseto is usually warm. The average temperature is of 21.2 °C (70 °F), with a minimum of 15.2 °C (59.4 °F) and a maximum of 27.2 °C (80.9 °F).
On the coldest nights, which normally occur at the end of the month, the temperature usually drops to around 9.5 °C (49.5 °F). However, it dropped to 5.8 °C (42.4 °F) in September 2018.
On the warmest days, which normally occur at the beginning of the month, the temperature usually reaches around 32 °C (89 °F). However, it reached 35 °C (95 °F) in September 2016.
Precipitation amounts to 90 mm (3.5 in), distributed over 4 days.
The day lasts on average 12 hours and 25 minutes.
There are on average 8 hours of sunshine per day. So, the sun shines 64% of the time.
The average humidity is 69%.
The average wind speed is 13 kph (8 mph).
The average sea temperature is of 23.5 °C (74 °F). Therefore, the sea can be considered barely acceptable for swimming.

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In October, the weather in Grosseto is usually very mild. The average temperature is of 17.2 °C (63 °F), with a minimum of 11.9 °C (53.5 °F) and a maximum of 22.5 °C (72.4 °F).
On the coldest nights, which normally occur at the end of the month, the temperature usually drops to around 6 °C (42.5 °F). However, it dropped to 1.4 °C (34.5 °F) in October 1994.
On the warmest days, which normally occur at the beginning of the month, the temperature usually reaches around 27 °C (80.5 °F). However, it reached 30.6 °C (87.1 °F) in October 2001.
Precipitation amounts to 75 mm (3 in), distributed over 6 days.
The day lasts on average 11 hours and 0 minutes.
There are on average 6 hours of sunshine per day. So, the sun shines 55% of the time.
The average humidity is 77%. Hence, the air is normally humid.
The average wind speed is 13 kph (8 mph).
The average sea temperature is of 21 °C (69.5 °F). Therefore, the sea is cool for swimming.

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In November, the weather in Grosseto is usually mild. The average temperature is of 12.4 °C (54 °F), with a minimum of 7.8 °C (46.1 °F) and a maximum of 17.1 °C (62.7 °F).
On the coldest nights, which normally occur at the end of the month, the temperature usually drops to around 1 °C (33.5 °F). However, it dropped to -4 °C (24.8 °F) in November 1995.
On the warmest days, which normally occur at the beginning of the month, the temperature usually reaches around 22 °C (72 °F). However, it reached 27 °C (80.6 °F) in November 2004.
Precipitation amounts to 100 mm (3.9 in), distributed over 7 days.
The day lasts on average 9 hours and 40 minutes.
There are on average 4 hours of sunshine per day. So, the sun shines 43% of the time.
The average humidity is 79%. Hence, the air is normally humid.
The average wind speed is 14 kph (9 mph).
The average sea temperature is of 18 °C (64.5 °F). Therefore, the sea is cold for swimming.

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In December, the weather in Grosseto is usually mild. The average temperature is of 8.7 °C (48 °F), with a minimum of 4 °C (39.3 °F) and a maximum of 13.3 °C (56 °F).
On the coldest nights of the month, the temperature usually drops to around -2.5 °C (27.5 °F). However, it dropped to -9.6 °C (14.7 °F) in December 1996.
On the warmest days of the month, the temperature usually reaches around 18 °C (64.5 °F). However, it reached 20 °C (68 °F) in December 2003.
Precipitation amounts to 90 mm (3.5 in), distributed over 8 days.
The day lasts on average 9 hours and 5 minutes. December 21, the winter solstice, is the shortest day of the year in the Northern Hemisphere.
There are on average 4 hours of sunshine per day. So, the sun shines 42% of the time.
The average humidity is 77%. Hence, the air is normally humid.
The average wind speed is 14 kph (9 mph).
The average sea temperature is of 15.5 °C (60 °F). Therefore, the sea is cold for swimming.