Weather and climate in Santa Marinella (Lazio)

The climate of Santa Marinella is Mediterranean, with mild, rainy winters and hot, sunny summers.
The town is located on the Lazio coast, about 50 km (30 mi) north-west of Rome. Nearby are Civitavecchia and Santa Severa. Inland, we find the westernmost part of the Monti della Tolfa, hills that reach 600 meters (1,970 feet) in height.
We are on the Capo Linaro promontory, where the influence of the sea is very strong and therefore the climate is particularly mild. Suffice it to say that the temperature almost never drops to -5 °C (23 °F) in winter and almost never reaches 35 °C (95 °F) in summer.

Best Time

The best months for a beach holiday in Santa Marinella are July and August. In June, the sea is still a little cool.

Santa Marinella - Climate data

The average temperature of the coldest month (January) is of 10.5 °C (50.9 °F), that of the warmest month (August) is of 25.3 °C (77.5 °F). Here are the average temperatures.
Precipitation amounts to 760 millimeters (29.9 inches) per year: so, it is at an intermediate level. It ranges from 14 mm (0.6 in) in the driest month (July) to 117 mm (4.6 in) in the wettest one (November). Here is the average precipitation.
The sea temperature ranges from 13.5 °C (56 °F) in February to 25 °C (77 °F) in August. Here are the average sea temperatures.
There are on average around 2510 sunshine hours per year. Here are the average hours of sunshine per day.

Santa Marinella - Weather by month

Based on the period 1991-2020

---

January, the coldest month of the year, is generally a mild month. The average temperature is of 10.5 °C (51 °F), with a minimum of 7.5 °C (45.6 °F) and a maximum of 13.5 °C (56.3 °F).
On the coldest nights of the month, the temperature usually drops to around 2 °C (36 °F). However, it dropped to -1.6 °C (29.1 °F) in January 2017.
On the warmest days of the month, the temperature usually reaches around 17.5 °C (63.5 °F). However, it reached 19 °C (66.2 °F) in January 1993.
Precipitation amounts to 66 mm (2.6 in), distributed over 7 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 41% of the time.
The average humidity is 73%. Hence, the air is normally humid.
The average wind speed is 12 kph (8 mph).
The average sea temperature is of 14 °C (57.5 °F). Therefore, the sea is very cold for swimming.

---

February is generally a mild month. The average temperature is of 10.6 °C (51 °F), with a minimum of 7.3 °C (45.1 °F) and a maximum of 13.8 °C (56.9 °F).
On the coldest nights of the month, the temperature usually drops to around 2 °C (36 °F). However, it dropped to -2.9 °C (26.8 °F) in February 2018.
On the warmest days of the month, the temperature usually reaches around 18 °C (64.5 °F). However, it reached 22.2 °C (72 °F) in February 2019.
Precipitation amounts to 63 mm (2.5 in), distributed over 6 days.
The day lasts on average 10 hours and 35 minutes.
There are on average 5 hours of sunshine per day. So, the sun shines 45% of the time.
The average humidity is 71%. Hence, the air is normally humid.
The average wind speed is 13 kph (8 mph).
The average sea temperature is of 13.5 °C (56.5 °F). Therefore, the sea is very cold for swimming.

---

March is generally a mild month. The average temperature is of 12.2 °C (54 °F), with a minimum of 9 °C (48.2 °F) and a maximum of 15.5 °C (59.9 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around 4 °C (39.5 °F). However, it dropped to -0.8 °C (30.6 °F) in March 2005.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 20 °C (67.5 °F). However, it reached 22.8 °C (73 °F) in March 2017.
Precipitation amounts to 73 mm (2.9 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 74%. Hence, the air is normally humid.
The average wind speed is 12 kph (8 mph).
The average sea temperature is of 14 °C (57 °F). Therefore, the sea is very cold for swimming.

---

April is generally a very mild month. The average temperature is of 14.6 °C (58 °F), with a minimum of 11.4 °C (52.6 °F) and a maximum of 17.8 °C (64.1 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around 7 °C (44.5 °F). However, it dropped to 1.6 °C (34.9 °F) in April 2003.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 23 °C (73.5 °F). However, it reached 25.4 °C (77.7 °F) in April 2011.
Precipitation amounts to 58 mm (2.3 in), distributed over 6 days.
The day lasts on average 13 hours and 25 minutes.
There are on average 6.5 hours of sunshine per day. So, the sun shines 50% of the time.
The average humidity is 76%. Hence, the air is normally humid.
The average wind speed is 11 kph (7 mph).
The average sea temperature is of 15 °C (59 °F). Therefore, the sea is cold for swimming.

---

May is generally a warm month. The average temperature is of 18.4 °C (65 °F), with a minimum of 15.1 °C (59.1 °F) and a maximum of 21.7 °C (71 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around 11 °C (52 °F). However, it dropped to 7.4 °C (45.3 °F) in May 2019.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 28 °C (82 °F). However, it reached 30.6 °C (87.1 °F) in May 2008.
Precipitation amounts to 44 mm (1.7 in), distributed over 5 days.
The day lasts on average 14 hours and 35 minutes. So the days are long.
There are on average 8.5 hours of sunshine per day. So, the sun shines 58% of the time.
The average humidity is 74%. Hence, the air is normally humid.
The average wind speed is 11 kph (7 mph).
The average sea temperature is of 18 °C (64.5 °F). Therefore, the sea is cold for swimming.

---

June is generally a warm month. The average temperature is of 22.1 °C (72 °F), with a minimum of 18.8 °C (65.9 °F) and a maximum of 25.4 °C (77.7 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around 15 °C (58.5 °F). However, it dropped to 11.6 °C (52.9 °F) in June 2006.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 30.5 °C (87 °F). However, it reached 33.2 °C (91.8 °F) in June 2007.
Precipitation amounts to 28 mm (1.1 in), distributed over 3 days.
The day lasts on average 15 hours and 10 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 63% of the time.
The average humidity is 74%. Hence, the air is normally humid.
The average wind speed is 11 kph (7 mph).
The average sea temperature is of 21.5 °C (70.5 °F). Therefore, the sea is cool for swimming.

---

July is generally a warm to hot, muggy month. The average temperature is of 24.7 °C (76 °F), with a minimum of 21.4 °C (70.5 °F) and a maximum of 28 °C (82.4 °F).
On the coldest nights of the month, the temperature usually drops to around 18 °C (64 °F). However, it dropped to 14 °C (57.2 °F) in July 1991.
On the warmest days of the month, the temperature usually reaches around 32 °C (89.5 °F). However, it reached 34 °C (93.2 °F) in July 1994.
Precipitation amounts to 14 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 10.5 hours of sunshine per day. So, the sun shines 71% of the time.
The average humidity is 74%. Hence, the air is normally humid.
The average wind speed is 10 kph (6 mph).
The average sea temperature is of 24.5 °C (76 °F). Therefore, the sea is warm enough for swimming.

---

August, the hottest month of the year, is generally a warm to hot, muggy month. The average temperature is of 25.3 °C (77 °F), with a minimum of 22 °C (71.5 °F) and a maximum of 28.6 °C (83.4 °F).
On the coldest nights of the month, the temperature usually drops to around 19 °C (66 °F). However, it dropped to 17 °C (62.6 °F) in August 1993.
On the warmest days of the month, the temperature usually reaches around 33 °C (91 °F). However, it reached 35.5 °C (95.9 °F) in August 2020.
Precipitation amounts to 17 mm (0.7 in), distributed over 2 days.
The day lasts on average 13 hours and 50 minutes.
There are on average 9.5 hours of sunshine per day. So, the sun shines 69% of the time.
The average humidity is 73%. Hence, the air is normally humid.
The average wind speed is 10 kph (6 mph).
The average sea temperature is of 25 °C (77.5 °F). Therefore, the sea is warm enough for swimming.

---

September is generally a warm month. The average temperature is of 22.1 °C (72 °F), with a minimum of 18.9 °C (66 °F) and a maximum of 25.4 °C (77.7 °F).
On the coldest nights, which normally occur at the end of the month, the temperature usually drops to around 14.5 °C (57.5 °F). However, it dropped to 11.6 °C (52.9 °F) in September 2008.
On the warmest days, which normally occur at the beginning of the month, the temperature usually reaches around 29.5 °C (85 °F). However, it reached 31.8 °C (89.2 °F) in September 2009.
Precipitation amounts to 73 mm (2.9 in), distributed over 5 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 74%. Hence, the air is normally humid.
The average wind speed is 11 kph (7 mph).
The average sea temperature is of 23.5 °C (74 °F). Therefore, the sea can be considered barely acceptable for swimming.

---

October is generally a warm month. The average temperature is of 19.0 °C (66 °F), with a minimum of 15.9 °C (60.7 °F) and a maximum of 22 °C (71.6 °F).
On the coldest nights, which normally occur at the end of the month, the temperature usually drops to around 11 °C (51.5 °F). However, it dropped to 5.8 °C (42.4 °F) in October 2007.
On the warmest days, which normally occur at the beginning of the month, the temperature usually reaches around 25.5 °C (78 °F). However, it reached 27.6 °C (81.7 °F) in October 2009.
Precipitation amounts to 114 mm (4.5 in), distributed over 7 days.
The day lasts on average 11 hours and 0 minutes.
There are on average 6.5 hours of sunshine per day. So, the sun shines 59% of the time.
The average humidity is 75%. Hence, the air is normally humid.
The average wind speed is 12 kph (7 mph).
The average sea temperature is of 21 °C (69.5 °F). Therefore, the sea is cool for swimming.

---

November is generally a very mild month. The average temperature is of 15.2 °C (59 °F), with a minimum of 12.2 °C (54 °F) and a maximum of 18.2 °C (64.7 °F).
On the coldest nights, which normally occur at the end of the month, the temperature usually drops to around 6.5 °C (43.5 °F). However, it dropped to 2 °C (35.6 °F) in November 2013.
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 26.6 °C (79.9 °F) in November 2004.
Precipitation amounts to 117 mm (4.6 in), distributed over 9 days.
The day lasts on average 9 hours and 50 minutes.
There are on average 4.5 hours of sunshine per day. So, the sun shines 48% 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 18 °C (64.5 °F). Therefore, the sea is cold for swimming.

---

December is generally a mild month. The average temperature is of 11.6 °C (53 °F), with a minimum of 8.6 °C (47.5 °F) and a maximum of 14.7 °C (58.4 °F).
On the coldest nights of the month, the temperature usually drops to around 2 °C (36 °F). However, it dropped to -4.3 °C (24.3 °F) in December 2001.
On the warmest days of the month, the temperature usually reaches around 18.5 °C (65.5 °F). However, it reached 20.8 °C (69.4 °F) in December 2011.
Precipitation amounts to 93 mm (3.7 in), distributed over 8 days.
The day lasts on average 9 hours and 10 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 45% of the time.
The average humidity is 72%. Hence, the air is normally humid.
The average wind speed is 12 kph (8 mph).
The average sea temperature is of 15.5 °C (60 °F). Therefore, the sea is cold for swimming.