Climate in San José (California)

The climate of San José is Mediterranean, with mild, rainy winters and hot, sunny summers.
The city is located in California, in the northern part of Santa Clara valley, and south of San Francisco bay. We are in the so-called Silicon Valley.
On the coldest nights of the year, the temperature generally drops to around freezing, while during the day it remains around 10 °C (50 °F). But in December 1990, it dropped to -7 °C (19 °F). Snow is very rare; here, as in San Francisco, locals remember the snowfall of February 1976.
Summer is definitely warmer than in San Francisco: there are several days with highs around 30 °C (86 °F), and on the hottest days of the year (with the wind blowing from the desert), the temperature can reach 37/38 °C (99/100 °F). In June 2000 and in September 2017, it reached 43 °C (109.5 °F).



In San Francisco bay, and also in the ocean to the west, the sea temperature ranges between 12 °C (54 °F) and 15 °C (59 °F). So, it is cold all year round.

Best Time

The best time to visit San José is the spring, in April and May, since it is a mild and sunny period. In summer, from June to September, it is generally not too hot, but sometimes there can be very hot days.

San José - Climate data

In San José, the average temperature of the coldest month (December) is of 10.4 °C (50.8 °F), that of the warmest month (August) is of 21.8 °C (71.2 °F). Here are the average temperatures.
Precipitation amounts to 410 millimeters (16.1 inches) per year: it is therefore quite scarce. It ranges from 0 mm (0 in) in the driest months (July, August, September) to 80 mm (3.1 in) in the wettest ones (February, December) Here is the average precipitation.
The sea temperature ranges from 12 °C (54 °F) in March, April, May to

San José - Weather by month

Based on the period 1991-2020

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January is generally a mild month. The average temperature is of 10.6 °C (51 °F), with a minimum of 6.3 °C (43.3 °F) and a maximum of 15 °C (59 °F).
On the coldest nights of the month, the temperature usually drops to around 0 °C (32.5 °F). However, it dropped to -4 °C (24.8 °F) in January 1997.
On the warmest days of the month, the temperature usually reaches around 21 °C (69.5 °F). However, it reached 28 °C (82.4 °F) in January 2009.
Precipitation amounts to 75 mm (3 in), distributed over 10 days.
The day lasts on average 9 hours and 55 minutes.
The average humidity is 70%.
The average wind speed is 8 kph (5 mph).
The average sea temperature is of 12.5 °C (54.5 °F). Therefore, the sea is very cold for swimming.

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February is generally a mild month. The average temperature is of 12.3 °C (54 °F), with a minimum of 7.4 °C (45.4 °F) and a maximum of 17.1 °C (62.8 °F).
On the coldest nights of the month, the temperature usually drops to around 2 °C (35.5 °F). However, it dropped to -1 °C (30.2 °F) in February 2019.
On the warmest days of the month, the temperature usually reaches around 23.5 °C (74 °F). However, it reached 29 °C (84.2 °F) in February 2002.
Precipitation amounts to 80 mm (3.1 in), distributed over 12 days.
The day lasts on average 10 hours and 55 minutes.
The average humidity is 65%.
The average wind speed is 11 kph (7 mph).
The average sea temperature is of 12.5 °C (54 °F). Therefore, the sea is very cold for swimming.

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March is generally a mild month. The average temperature is of 13.9 °C (57 °F), with a minimum of 8.7 °C (47.6 °F) and a maximum of 19.1 °C (66.4 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around 3.5 °C (38.5 °F). However, it dropped to 2 °C (35.6 °F) in March 1997.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 26 °C (79 °F). However, it reached 35 °C (95 °F) in March 2015.
Precipitation amounts to 65 mm (2.6 in), distributed over 9 days.
The day lasts on average 12 hours and 0 minutes.
The average humidity is 62%.
The average wind speed is 12 kph (8 mph).
The average sea temperature is of 12 °C (54 °F). Therefore, the sea is very cold for swimming.

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April is generally a very mild month. The average temperature is of 15.5 °C (60 °F), with a minimum of 9.9 °C (49.8 °F) and a maximum of 21.1 °C (70 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around 5 °C (41.5 °F). However, it dropped to 3 °C (37.4 °F) in April 1999.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 30.5 °C (86.5 °F). However, it reached 36 °C (96.8 °F) in April 2009.
Precipitation amounts to 30 mm (1.2 in), distributed over 6 days.
The day lasts on average 13 hours and 10 minutes.
The average humidity is 56%.
The average wind speed is 14 kph (9 mph).
The average sea temperature is of 12 °C (53.5 °F). Therefore, the sea is very cold for swimming.

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May is generally a very mild month. The average temperature is of 17.8 °C (64 °F), with a minimum of 11.8 °C (53.3 °F) and a maximum of 23.8 °C (74.9 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around 8.5 °C (47.5 °F). However, it dropped to 7 °C (44.6 °F) in May 1997.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 33 °C (91.5 °F). However, it reached 38 °C (100.4 °F) in May 2000.
Precipitation amounts to 15 mm (0.6 in), distributed over 4 days.
The day lasts on average 14 hours and 10 minutes. So the days are long.
The average humidity is 53%.
The average wind speed is 15 kph (9 mph).
The average sea temperature is of 12 °C (54 °F). Therefore, the sea is very cold for swimming.

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June is generally a warm month. The average temperature is of 20.3 °C (69 °F), with a minimum of 13.9 °C (57 °F) and a maximum of 26.7 °C (80.1 °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 9 °C (48.2 °F) in June 1999.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 37 °C (99 °F). However, it reached 43 °C (109.4 °F) in June 2000.
Precipitation amounts to only 5 mm (0.2 in), and all occurs in one day.
The day lasts on average 14 hours and 40 minutes. So the days are long. June 21, the summer solstice, is the longest day of the year in the Northern Hemisphere.
The average humidity is 50%.
The average wind speed is 15 kph (9 mph).
The average sea temperature is of 12.5 °C (55 °F). Therefore, the sea is very cold for swimming.

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July is generally a warm month. The average temperature is of 21.5 °C (71 °F), with a minimum of 15.1 °C (59.1 °F) and a maximum of 27.9 °C (82.2 °F).
On the coldest nights of the month, the temperature usually drops to around 13 °C (55.5 °F). However, it dropped to 11 °C (51.8 °F) in July 2002.
On the warmest days of the month, the temperature usually reaches around 36.5 °C (98 °F). However, it reached 42 °C (107.6 °F) in July 2006.
Precipitation amounts to only 0 mm (0 in), so on average it never rains in the whole month.
The day lasts on average 14 hours and 25 minutes. So the days are long.
The average humidity is 52%.
The average wind speed is 14 kph (8 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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August, the warmest month of the year, is generally a warm month. The average temperature is of 21.8 °C (71 °F), with a minimum of 15.4 °C (59.8 °F) and a maximum of 28.2 °C (82.7 °F).
On the coldest nights of the month, the temperature usually drops to around 12.5 °C (55 °F). However, it dropped to 11 °C (51.8 °F) in August 2010.
On the warmest days of the month, the temperature usually reaches around 36.5 °C (97.5 °F). However, it reached 40.5 °C (104.9 °F) in August 1993.
Precipitation amounts to only 0 mm (0 in), so on average it never rains in the whole month.
The day lasts on average 13 hours and 30 minutes.
The average humidity is 53%.
The average wind speed is 13 kph (8 mph).
The average sea temperature is of 14.5 °C (58.5 °F). Therefore, the sea is very cold for swimming.

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September is generally a warm month. The average temperature is of 21 °C (70 °F), with a minimum of 14.6 °C (58.2 °F) and a maximum of 27.4 °C (81.4 °F).
On the coldest nights, which normally occur at the end of the month, the temperature usually drops to around 10.5 °C (51.5 °F). However, it dropped to 9 °C (48.2 °F) in September 1999.
On the warmest days, which normally occur at the beginning of the month, the temperature usually reaches around 36 °C (97 °F). However, it reached 43 °C (109.4 °F) in September 2017.
Precipitation amounts to only 0 mm (0 in), so on average it never rains in the whole month.
The day lasts on average 12 hours and 25 minutes.
The average humidity is 52%.
The average wind speed is 12 kph (7 mph).
The average sea temperature is of 15 °C (59 °F). Therefore, the sea is cold for swimming.

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October is generally a very mild month. The average temperature is of 17.9 °C (64 °F), with a minimum of 12.1 °C (53.8 °F) and a maximum of 23.7 °C (74.6 °F).
On the coldest nights, which normally occur at the end of the month, the temperature usually drops to around 7 °C (45 °F). However, it dropped to 4.4 °C (39.9 °F) in October 1991.
On the warmest days, which normally occur at the beginning of the month, the temperature usually reaches around 32.5 °C (91 °F). However, it reached 37 °C (98.6 °F) in October 2012.
Precipitation amounts to 20 mm (0.8 in), distributed over 3 days.
The day lasts on average 11 hours and 10 minutes.
The average humidity is 54%.
The average wind speed is 10 kph (6 mph).
The average sea temperature is of 14.5 °C (58.5 °F). Therefore, the sea is very cold for swimming.

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November is generally a mild month. The average temperature is of 13.4 °C (56 °F), with a minimum of 8.4 °C (47.2 °F) and a maximum of 18.3 °C (65 °F).
On the coldest nights, which normally occur at the end of the month, the temperature usually drops to around 2.5 °C (36.5 °F). However, it dropped to -1.2 °C (29.8 °F) in November 1993.
On the warmest days, which normally occur at the beginning of the month, the temperature usually reaches around 26 °C (79 °F). However, it reached 30 °C (86 °F) in November 1997.
Precipitation amounts to 35 mm (1.4 in), distributed over 7 days.
The day lasts on average 10 hours and 5 minutes.
The average humidity is 63%.
The average wind speed is 8 kph (5 mph).
The average sea temperature is of 14 °C (57 °F). Therefore, the sea is very cold for swimming.

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December, the coldest month of the year, is generally a mild month. The average temperature is of 10.4 °C (51 °F), with a minimum of 6 °C (42.8 °F) and a maximum of 14.9 °C (58.8 °F).
On the coldest nights of the month, the temperature usually drops to around 0 °C (32 °F). However, it dropped to -3 °C (26.6 °F) in December 1998.
On the warmest days of the month, the temperature usually reaches around 20.5 °C (69 °F). However, it reached 28 °C (82.4 °F) in December 1998.
Precipitation amounts to 80 mm (3.1 in), distributed over 11 days.
The day lasts on average 9 hours and 35 minutes. December 21, the winter solstice, is the shortest day of the year in the Northern Hemisphere.
The average humidity is 67%.
The average wind speed is 9 kph (5 mph).
The average sea temperature is of 13 °C (55 °F). Therefore, the sea is very cold for swimming.