, with very mild, relatively rainy winters and warm, sunny summers.
, in the far south-west of the United States, on the border with Mexico. Despite the low latitude (32 degrees north latitude), the climate is so mild, spring-like most of the year, because a cold current flows on the Pacific coast.
are around 19/20 °C (66/68 °F) from December to March and 24/25 °C (75/77 °F) from July to October.
The cold record from 1981 to 2020 is 0.5 °C (33 °F), set in December 1988, while the heat record is 41.5 °C (107 °F), set in September of the same year.
in San Diego is scarce, given that it amounts to just 250 millimeters (9.8 inches) per year, so it is at a semi-desert level. However, the rainfall pattern is similar to that of the Mediterranean climate, but with a drier autumn, since most of the rain falls from December to March, while in summer it hardly ever rains.
in San Diego is good all year round, but especially in winter, when the sun shines 75% of the time. The least sunny months are May and June, due to the morning fog that forms on the coast and in the neighborhoods up to about 15 km (9 miles) away from the coast (the phenomenon is called
, even though it actually occurs in May and June, and sometimes in July). In total, there are 3,000 hours of sunshine per year.
in San Diego remains a bit cold even in summer: from July to October, the water temperature is of 19.5/20.5 °C (67/69 °F).
, in the towns of San Diego county that in fact are part of the conurbation of the same city, the climate becomes more continental: winter nights are colder (sometimes the night minimum drops around freezing or even slightly below), while the days are warmer all year round.
Moreover, very hot days, with highs of 35 °C (95 °F) and more, are decidedly more frequent. In September 2010, 45 °C (113 °F) were reached (while at the international airport, the temperature didn't exceed 35 °C or 95 °F).
, about 28 km (17 mi) from the coast, daytime temperatures are 20/21 °C (68/70 °F) from December to March and 30/31 °C (86/88 °F) from July to September.
Having a great climate, San Diego can be visited all year round. However, from December to March, it can rain, and it can get a bit cold at night, especially in inland areas. In May and June, there may be morning mists. In summer, but especially in September and October, there can be very hot days, when the wind blows from the desert.
The best time to go to the beach is from July to October, when the sea is less cold.
. Here are the average temperatures.
January is generally a mild month. The average temperature is of
14.5 °C, with a minimum of
9.5 °C and a maximum of
19.6 °C.
On the coldest nights of the month, the temperature usually drops to around
6 °C. However, it dropped to
1.7 °C in January 2007.
On the warmest days of the month, the temperature usually reaches around
26 °C. However, it reached
30.6 °C in January 2005.
Precipitation amounts to
50 mm, distributed over 6 days.
The day lasts on average 10 hours and 20 minutes.
There are on average 7.5 hours of sunshine per day. So, the sun shines 75% of the time.
The average humidity is 64%.
The average wind speed is of
7.9 kph.
The average sea temperature is of
15.2 °C. Therefore, the sea is cold for swimming.
February is generally a very mild month. The average temperature is of
14.9 °C, with a minimum of
10.3 °C and a maximum of
19.5 °C.
On the coldest nights of the month, the temperature usually drops to around
7 °C. However, it dropped to
3.3 °C in February 2020.
On the warmest days of the month, the temperature usually reaches around
26 °C. However, it reached
32.2 °C in February 1995.
Precipitation amounts to
55 mm, distributed over 7 days.
The day lasts on average 11 hours and 5 minutes.
There are on average 8 hours of sunshine per day. So, the sun shines 73% of the time.
The average humidity is 66%.
The average wind speed is of
9.5 kph.
The average sea temperature is of
15.1 °C. Therefore, the sea is cold for swimming.
March is generally a very mild month. The average temperature is of
15.8 °C, with a minimum of
11.9 °C and a maximum of
19.8 °C.
On the coldest nights of the month, the temperature usually drops to around
8.5 °C. However, it dropped to
5.6 °C in March 1991.
On the warmest days of the month, the temperature usually reaches around
26.5 °C. However, it reached
32.8 °C in March 2004.
Precipitation amounts to
35 mm, distributed over 6 days.
The day lasts on average 12 hours and 0 minutes.
There are on average 8.5 hours of sunshine per day. So, the sun shines 70% of the time.
The average humidity is 67%.
The average wind speed is of
10.3 kph.
The average sea temperature is of
15.4 °C. Therefore, the sea is cold for swimming.
April is generally a very mild month. The average temperature is of
17.1 °C, with a minimum of
13.3 °C and a maximum of
20.8 °C.
On the coldest nights of the month, the temperature usually drops to around
10.5 °C. However, it dropped to
7 °C in April 1999.
On the warmest days of the month, the temperature usually reaches around
28 °C. However, it reached
36.7 °C in April 2009.
Precipitation amounts to
15 mm, distributed over 4 days.
The day lasts on average 13 hours and 0 minutes.
There are on average 9 hours of sunshine per day. So, the sun shines 71% of the time.
The average humidity is 66%.
The average wind speed is of
11.3 kph.
The average sea temperature is of
15.8 °C. Therefore, the sea is cold for swimming.
May is generally a warm month. The average temperature is of
18.2 °C, with a minimum of
15.3 °C and a maximum of
21.2 °C.
On the coldest nights of the month, the temperature usually drops to around
12.5 °C. However, it dropped to
8.9 °C in May 1995.
On the warmest days of the month, the temperature usually reaches around
26.5 °C. However, it reached
36.1 °C in May 2014.
Precipitation amounts to only
7.1 mm, distributed over 2 days.
The day lasts on average 13 hours and 55 minutes.
There are on average 8 hours of sunshine per day. So, the sun shines 58% of the time.
The average humidity is 70%. Hence, the air is normally humid.
The average wind speed is of
11.5 kph.
The average sea temperature is of
16.8 °C. Therefore, the sea is cold for swimming.
June is generally a warm month. The average temperature is of
19.4 °C, with a minimum of
16.6 °C and a maximum of
22.2 °C.
On the coldest nights of the month, the temperature usually drops to around
14.5 °C. However, it dropped to
10.6 °C in June 2013.
On the warmest days of the month, the temperature usually reaches around
27 °C. However, it reached
35.6 °C in June 2006.
Precipitation amounts to only
1.3 mm, and all occurs in one day.
The day lasts on average 14 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 8 hours of sunshine per day. So, the sun shines 56% of the time.
The average humidity is 73%. Hence, the air is normally humid.
The average wind speed is of
11.2 kph.
The average sea temperature is of
18 °C. Therefore, the sea is cold for swimming.
July is generally a warm month. The average temperature is of
21.3 °C, with a minimum of
18.6 °C and a maximum of
24.1 °C.
On the coldest nights of the month, the temperature usually drops to around
17 °C. However, it dropped to
15 °C in July 1995.
On the warmest days of the month, the temperature usually reaches around
28.5 °C. However, it reached
37.2 °C in July 2006.
Precipitation amounts to only
2 mm, and all occurs in one day.
The day lasts on average 14 hours and 0 minutes.
There are on average 10 hours of sunshine per day. So, the sun shines 70% of the time.
The average humidity is 75%. Hence, the air is normally humid.
The average wind speed is of
10.9 kph.
The average sea temperature is of
19.7 °C. Therefore, the sea is very cool for swimming.
August, the warmest month of the year, is generally a warm month. The average temperature is of
22.3 °C, with a minimum of
19.4 °C and a maximum of
25.2 °C.
On the coldest nights of the month, the temperature usually drops to around
17.5 °C. However, it dropped to
15.6 °C in August 1999.
On the warmest days of the month, the temperature usually reaches around
29.5 °C. However, it reached
34.4 °C in August 1991.
Precipitation amounts to only
0.2 mm, distributed over 0 days.
The day lasts on average 13 hours and 20 minutes.
There are on average 9.5 hours of sunshine per day. So, the sun shines 71% of the time.
The average humidity is 75%. Hence, the air is normally humid.
The average wind speed is of
10.6 kph.
The average sea temperature is of
20.5 °C. Therefore, the sea is cool for swimming.
September is generally a warm month. The average temperature is of
22 °C, with a minimum of
18.6 °C and a maximum of
25.3 °C.
On the coldest nights of the month, the temperature usually drops to around
16 °C. However, it dropped to
13.9 °C in September 1993.
On the warmest days of the month, the temperature usually reaches around
32.5 °C. However, it reached
38.3 °C in September 2012.
Precipitation amounts to only
3 mm, and all occurs in one day.
The day lasts on average 12 hours and 20 minutes.
There are on average 8.5 hours of sunshine per day. So, the sun shines 68% of the time.
The average humidity is 73%. Hence, the air is normally humid.
The average wind speed is of
10.2 kph.
The average sea temperature is of
20.5 °C. Therefore, the sea is cool for swimming.
October is generally a warm month. The average temperature is of
20.1 °C, with a minimum of
16 °C and a maximum of
24.2 °C.
On the coldest nights of the month, the temperature usually drops to around
12.5 °C. However, it dropped to
6.7 °C in October 2019.
On the warmest days of the month, the temperature usually reaches around
31 °C. However, it reached
37.2 °C in October 1994.
Precipitation amounts to
13 mm, distributed over 2 days.
The day lasts on average 11 hours and 20 minutes.
There are on average 8 hours of sunshine per day. So, the sun shines 69% of the time.
The average humidity is 68%.
The average wind speed is of
8.8 kph.
The average sea temperature is of
19.4 °C. Therefore, the sea is very cool for swimming.
November is generally a very mild month. The average temperature is of
17 °C, with a minimum of
12 °C and a maximum of
22 °C.
On the coldest nights of the month, the temperature usually drops to around
8 °C. However, it dropped to
3.9 °C in November 1994.
On the warmest days of the month, the temperature usually reaches around
29.5 °C. However, it reached
38 °C in November 2010.
Precipitation amounts to
20 mm, distributed over 4 days.
The day lasts on average 10 hours and 30 minutes.
There are on average 7.5 hours of sunshine per day. So, the sun shines 73% of the time.
The average humidity is 63%.
The average wind speed is of
7.8 kph.
The average sea temperature is of
17.7 °C. Therefore, the sea is cold for swimming.
December, the coldest month of the year, is generally a mild month. The average temperature is of
14.3 °C, with a minimum of
9.2 °C and a maximum of
19.4 °C.
On the coldest nights of the month, the temperature usually drops to around
5.5 °C. However, it dropped to
3.3 °C in December 1992.
On the warmest days of the month, the temperature usually reaches around
25 °C. However, it reached
28.3 °C in December 2004.
Precipitation amounts to
40 mm, distributed over 6 days.
The day lasts on average 10 hours and 0 minutes. December 21, the winter solstice, is the shortest day of the year in the Northern Hemisphere.
There are on average 7.5 hours of sunshine per day. So, the sun shines 75% of the time.
The average humidity is 63%.
The average wind speed is of
7.6 kph.
The average sea temperature is of
15.9 °C. Therefore, the sea is cold for swimming.