Climate - Oakland (California)
Average weather, temperature, rainfall, sunshine hours
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Climate chart - Oakland (California)
The climate of Oakland can be defined as "Mediterranean with cool summers". In fact, both the winter temperatures and the rain pattern remind of the Mediterranean climate, but summer is unusually cool because of the cold current that flows along the coast of California and is able to keep the temperatures low.
The city is located east of San Francisco, across the bay, and is the county seat of Alameda county. Compared to San Francisco, the city is less exposed to fogs from the ocean on summer mornings. However, the most exposed areas are the northern one, towards Berkeley, and the eastern one, towards the hills.
In winter, there can be very mild days, with highs of 18/20 °C (64/68 °F).
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). Real cold spells are very rare, for example, in December 1990, it dropped to -4.3 °C (37 °F), with only 4 °C (39 °F) as maximum temperature. Snow is extremely rare; in February 1976, it snowed, although with temperatures above freezing.
On the hottest days of the year, the temperature usually reaches 33/35 °C (91/95 °F), and this happens more easily in September or early October, when a hot wind can blow from the desert, similar to the Santa Ana winds of the Los Angeles area, but less intense. On September 1, 2017, it reached 38.3 °C (37 °F).
The average temperature of the coldest month (January) is of 9.9 °C (49.9 °F), that of the warmest month (September) is of 18.2 °C (64.8 °F). Here are the average temperatures.
Oakland - Average temperatures (1991-2020) | Month | Min (°C) | Max (°C) | Mean (°C) | Min (°F) | Max (°F) | Mean (°F) |
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| January | 5.6 | 14.3 | 9.9 | 42 | 58 | 49.9 |
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| February | 7 | 15.7 | 11.4 | 45 | 60 | 52.4 |
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| March | 8.3 | 17.3 | 12.8 | 47 | 63 | 55 |
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| April | 9.5 | 18.7 | 14.1 | 49 | 66 | 57.4 |
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| May | 11.1 | 19.9 | 15.5 | 52 | 68 | 59.9 |
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| June | 12.3 | 21.9 | 17.1 | 54 | 71 | 62.8 |
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| July | 13.4 | 22 | 17.7 | 56 | 72 | 63.9 |
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| August | 13.8 | 22.4 | 18.1 | 57 | 72 | 64.6 |
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| September | 13.1 | 23.4 | 18.2 | 56 | 74 | 64.8 |
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| October | 10.7 | 21.9 | 16.3 | 51 | 71 | 61.3 |
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| November | 7.7 | 17.7 | 12.7 | 46 | 64 | 54.9 |
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| December | 5.7 | 14.4 | 10.1 | 42 | 58 | 50.1 |
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| Year | 9.9 | 19.2 | 14.45 | 49.7 | 66.5 | 58 |
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Precipitation amounts to 475 millimeters (18.7 inches) per year: it is therefore quite scarce. It ranges from 0 mm (0 in) in the driest months (July, August) to 100 mm (3.9 in) in the wettest (December). Here is the average precipitation.
Oakland - Average precipitation| Month | Millimeters | Inches | Days |
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| January | 85 | 3.3 | 10 |
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| February | 90 | 3.5 | 10 |
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| March | 70 | 2.8 | 10 |
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| April | 35 | 1.4 | 6 |
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| May | 15 | 0.6 | 3 |
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| June | 5 | 0.2 | 1 |
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| July | 0 | 0 | 0 |
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| August | 0 | 0 | 0 |
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| September | 5 | 0.2 | 2 |
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| October | 20 | 0.8 | 5 |
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| November | 50 | 2 | 8 |
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| December | 100 | 3.9 | 11 |
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| Year | 475 | 18.7 | 68 |
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The sea temperature ranges between 12 °C (54 °F) and 14.5 °C (58 °F). So, it is cold all year round. Here are the average sea temperatures.
Oakland - Sea temperature| Month | Celsius (°C) | Fahrenheit (°F) |
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January | 12.5 | 54 | February | 12 | 54 | March | 12 | 54 | April | 12 | 53 | May | 12 | 53 | June | 12 | 54 | July | 13 | 56 | August | 14 | 57 | September | 14.5 | 58 | October | 14 | 58 | November | 13.5 | 56 | December | 12.5 | 55 | Year | 12.9 | 55.2 |
Best Time
The best time to visit Oakland is the summer, from June to September, since it is the driest and warmest season of the year. However, you have to take into account cool temperatures, and sometimes even a little cold, at night and in the early morning, as well as morning fogs, so it's better to bring a jacket and a sweater.
Usually, in the months of April, May and October, the weather is good as well, in fact, it's often mild and sunny, even though there's a greater chance of rain; in addition, it can get cold at night, especially in April. Moreover, in spring, afternoon breezes are quite intense.
Back to California.
Oakland - 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 9.9 °C (50 °F), with a minimum of 5.6 °C (42 °F) and a maximum of 14.3 °C (57.7 °F).
On the coldest nights of the month, the temperature usually drops to around 1 °C (34 °F). However, it dropped to -2.2 °C (28 °F) in January 2007.
On the warmest days of the month, the temperature usually reaches around 19 °C (66.5 °F). However, it reached 25 °C (77 °F) in January 2009.
Precipitation amounts to 85 mm (3.3 in), distributed over 10 days.
The day lasts on average 9 hours and 55 minutes.
The average humidity is 79%. Hence, the air is normally humid.
The average wind speed is 11 kph (7 mph).
The average sea temperature is of 12.5 °C (54.5 °F). Therefore, the sea is very cold for swimming.
February is generally a mild month. The average temperature is of 11.4 °C (52 °F), with a minimum of 7 °C (44.6 °F) and a maximum of 15.7 °C (60.3 °F).
On the coldest nights of the month, the temperature usually drops to around 2 °C (36 °F). However, it dropped to -0.6 °C (30.9 °F) in February 2002.
On the warmest days of the month, the temperature usually reaches around 21 °C (70 °F). However, it reached 27.2 °C (81 °F) in February 2011.
Precipitation amounts to 90 mm (3.5 in), distributed over 10 days.
The day lasts on average 10 hours and 50 minutes.
The average humidity is 75%. Hence, the air is normally humid.
The average wind speed is 13 kph (8 mph).
The average sea temperature is of 12 °C (54 °F). Therefore, the sea is very cold for swimming.
March is generally a mild month. The average temperature is of 12.8 °C (55 °F), with a minimum of 8.3 °C (47 °F) and a maximum of 17.3 °C (63.1 °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 1.1 °C (34 °F) in March 2012.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 23.5 °C (74.5 °F). However, it reached 30 °C (86 °F) in March 2004.
Precipitation amounts to 70 mm (2.8 in), distributed over 10 days.
The day lasts on average 12 hours and 0 minutes.
The average humidity is 73%. Hence, the air is normally humid.
The average wind speed is 14 kph (9 mph).
The average sea temperature is of 12 °C (54 °F). Therefore, the sea is very cold for swimming.
April is generally a mild month. The average temperature is of 14.1 °C (57 °F), with a minimum of 9.5 °C (49.1 °F) and a maximum of 18.7 °C (65.6 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around 5.5 °C (42 °F). However, it dropped to 2.2 °C (36 °F) in April 2012.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 26.5 °C (80 °F). However, it reached 32.8 °C (91 °F) in April 2009.
Precipitation amounts to 35 mm (1.4 in), distributed over 6 days.
The day lasts on average 13 hours and 10 minutes.
The average humidity is 70%. Hence, the air is normally humid.
The average wind speed is 16 kph (10 mph).
The average sea temperature is of 12 °C (53 °F). Therefore, the sea is very cold for swimming.
May is generally a very mild month. The average temperature is of 15.5 °C (60 °F), with a minimum of 11.1 °C (51.9 °F) and a maximum of 19.9 °C (67.9 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around 8 °C (47 °F). However, it dropped to 5 °C (41 °F) in May 2010.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 29 °C (84 °F). However, it reached 37.2 °C (99 °F) in May 2008.
Precipitation amounts to 15 mm (0.6 in), distributed over 3 days.
The day lasts on average 14 hours and 20 minutes. So the days are long.
The average humidity is 72%. Hence, the air is normally humid.
The average wind speed is 17 kph (10 mph).
The average sea temperature is of 12 °C (53 °F). Therefore, the sea is very cold for swimming.
June is generally a very mild month. The average temperature is of 17.1 °C (63 °F), with a minimum of 12.3 °C (54.1 °F) and a maximum of 21.9 °C (71.4 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around 10 °C (49.5 °F). However, it dropped to 7.8 °C (46 °F) in June 2005.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 31.5 °C (89 °F). However, it reached 37.8 °C (100 °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 72%. Hence, the air is normally humid.
The average wind speed is 16 kph (10 mph).
The average sea temperature is of 12 °C (54 °F). Therefore, the sea is very cold for swimming.
July is generally a very mild month. The average temperature is of 17.7 °C (64 °F), with a minimum of 13.4 °C (56.2 °F) and a maximum of 22 °C (71.6 °F).
On the coldest nights of the month, the temperature usually drops to around 11.5 °C (52.5 °F). However, it dropped to 9.4 °C (48.9 °F) in July 2000.
On the warmest days of the month, the temperature usually reaches around 30 °C (86.5 °F). However, it reached 36 °C (96.8 °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 30 minutes. So the days are long.
The average humidity is 76%. Hence, the air is normally humid.
The average wind speed is 16 kph (10 mph).
The average sea temperature is of 13 °C (55.5 °F). Therefore, the sea is very cold for swimming.
August is generally a warm month. The average temperature is of 18.1 °C (65 °F), with a minimum of 13.8 °C (56.9 °F) and a maximum of 22.4 °C (72.4 °F).
On the coldest nights of the month, the temperature usually drops to around 11.5 °C (53 °F). However, it dropped to 9 °C (48.2 °F) in August 2011.
On the warmest days of the month, the temperature usually reaches around 30.5 °C (87 °F). However, it reached 38.3 °C (100.9 °F) in August 2020.
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 76%. 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.
September, the warmest month of the year, is generally a warm month. The average temperature is of 18.2 °C (65 °F), with a minimum of 13.1 °C (55.5 °F) and a maximum of 23.4 °C (74.1 °F).
On the coldest nights, which normally occur at the end of the month, the temperature usually drops to around 10 °C (50.5 °F). However, it dropped to 7.8 °C (46 °F) in September 2005.
On the warmest days, which normally occur at the beginning of the month, the temperature usually reaches around 32.5 °C (90.5 °F). However, it reached 40 °C (104 °F) in September 2020.
Precipitation amounts to only 5 mm (0.2 in), distributed over 2 days.
The day lasts on average 12 hours and 25 minutes.
The average humidity is 73%. Hence, the air is normally humid.
The average wind speed is 13 kph (8 mph).
The average sea temperature is of 14.5 °C (58 °F). Therefore, the sea is very cold for swimming.
October is generally a very mild month. The average temperature is of 16.3 °C (61 °F), with a minimum of 10.7 °C (51.2 °F) and a maximum of 21.9 °C (71.5 °F).
On the coldest nights, which normally occur at the end of the month, the temperature usually drops to around 7.5 °C (45 °F). However, it dropped to 4.4 °C (39.9 °F) in October 2002.
On the warmest days, which normally occur at the beginning of the month, the temperature usually reaches around 31 °C (88 °F). However, it reached 36.7 °C (98.1 °F) in October 2020.
Precipitation amounts to 20 mm (0.8 in), distributed over 5 days.
The day lasts on average 11 hours and 10 minutes.
The average humidity is 70%.
The average wind speed is 11 kph (7 mph).
The average sea temperature is of 14 °C (57.5 °F). Therefore, the sea is very cold for swimming.
November is generally a mild month. The average temperature is of 12.7 °C (55 °F), with a minimum of 7.7 °C (45.8 °F) and a maximum of 17.7 °C (63.9 °F).
On the coldest nights, which normally occur at the end of the month, the temperature usually drops to around 3.5 °C (38 °F). However, it dropped to -1.2 °C (29.8 °F) in November 1992.
On the warmest days, which normally occur at the beginning of the month, the temperature usually reaches around 24 °C (75 °F). However, it reached 28 °C (82.4 °F) in November 2008.
Precipitation amounts to 50 mm (2 in), distributed over 8 days.
The day lasts on average 10 hours and 5 minutes.
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 13.5 °C (56.5 °F). Therefore, the sea is very cold for swimming.
December is generally a mild month. The average temperature is of 10.1 °C (50 °F), with a minimum of 5.7 °C (42.3 °F) and a maximum of 14.4 °C (57.9 °F).
On the coldest nights of the month, the temperature usually drops to around 1 °C (33.5 °F). However, it dropped to -2.2 °C (28 °F) in December 2013.
On the warmest days of the month, the temperature usually reaches around 19.5 °C (67 °F). However, it reached 26.1 °C (79 °F) in December 2020.
Precipitation amounts to 100 mm (3.9 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 75%. Hence, the air is normally humid.
The average wind speed is 11 kph (7 mph).
The average sea temperature is of 12.5 °C (55 °F). Therefore, the sea is very cold for swimming.
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