Climate and monthly weather forecastSan Jose, CA
Climate and monthly weather forecast
The climate of San Jose
San Jose, nestled in the heart of California's Silicon Valley, enjoys a Mediterranean climate, often characterised by warm, dry summers and mild, wet winters. The Köppen Climate Classification designates it as Csb, representing its warm summer Mediterranean climate. Through well-defined seasonal variations, the city boasts diversity in its climatic aspects.On assessing the provided data, one can note a steady progression in temperature throughout the year. Temperatures rise from the cooler months at the beginning of the year, reaching a peak in the sunny summer months of July and August with averages of 82°F (27.8°C) and 81.9°F (27.7°C) respectively, and subsequently, dip towards the year's end. Similarly, rainfall displays a significant disparity across the twelve months, the wettest periods being December, January, and March, with rainfall averages ranging from 0.63" (16mm) to 0.83" (21mm). By contrast, the months from June to August are virtually rain-free. Meanwhile, the humidity levels appear relatively stable, within a narrow range of 60% to 73%.
The city also enjoys considerable daylight hours, with a high in these being in June at 14.7 hours, and thereafter a gradual reduction until reaching a low in December at 9.6 hours. While sunshine displays a similar trend, peaking during the summer, wind speeds vary between 4.4mph (7.1km/h) to 5.8mph (9.3km/h). The highest average wind speed is in April, at 5.8mph (9.3km/h).
The best time to visit San Jose
Those who enjoy warm, sunny weather would find that the period from June to August offers the most desirable conditions, with a culmination of warm temperatures, virtually no rainfall, high sunshine hours, and reasonable humidity levels. Pleasantly warm with temperatures peaking at 82°F (27.8°C) in July, and the daylight extending up to 14.7 hours in June, these months showcase the best of this sunny Californian city.The worst time to visit San Jose
For those sensitive to colder conditions and rainfall, the months of December, January, and February may not be ideal for a visit. Although, it is crucial to highlight that the 'colder' conditions in this region are quite mild in comparison to other regions, with the lower temperature limit hovering around 43°F (6.1°C). Coupled with the highest annual rainfall, the dampness and relative chill of these winter months may not appeal to all.Spring weather in San Jose
The transition from late winter into spring sees a marked elevation of temperatures and a decrease in rainfall. Temperatures rise from 58.1°F (14.5°C) in February to 70.5°F (21.4°C) in May while rainfall reduces from 0.67" (17mm) in February to only 0.2" (5mm) in May. Sunshine hours see a notable augmentation from 6.3 in February to 11.1 hours in May, making this season an attractive period to experience a vibrant San Jose.Summer weather in San Jose
The summer months in San Jose are a sunny delight, with temperatures ranging between 78.4°F (25.8°C) to 82°F (27.8°C). July, the warmest month, sees an average high temperature of 82°F (27.8°C). Minimal rainfall characterises this period, with monthly averages ranging from only 0.04" (1mm) to 0.08" (2mm). The generous sun lends long daylight hours, with June enjoying as much as 14.7 hours of daylight and a generous of 11.8 hours of sunshine.Autumn weather in San Jose
Autumn sees a slight drop in temperatures, ranging from 79.7°F (26.5°C) in September to 56.5°F (13.6°C) in November. August retains some summer warmth, transitioning into slightly cooler days in November. Rainfall gradually increases from September to November, but maintains a modest amount, rising from 0.08" (2mm) to 0.39" (10mm) over the period. The daylight hours decrease from a high of 12.4 hours in September to 10.2 hours in November but still provide ample sunshine, dropping from 11.2 hours to 6.7 hours over these months.Winter weather in San Jose
Winter in San Jose sees further reduced temperatures, ranging from 56.5°F (13.6°C) in December to 58.1°F (14.5°C) in February. As the rainfall surges, December receives the most with an average of 0.71" (18mm). This period also witnesses shorter days, with the least daylight hours in December at 9.6 hours. Concurrently, sunshine hours diminish too, from 6 hours in December to 6.3 hours by February, outlining the subdued winter climate of San Jose.Weather in January
San Jose weather in January displays the typical characteristics of the Californian winter. Dry cool air dominates the region, with relatively low temperatures and cloud cover. The city experiences wind speeds of 4.6mph (7.4km/h) on average, which can peak at 5.2mph (8.4km/h) and gust up to 7.5mph (12.1km/h), creating a cool breeze throughout the city. Weather in January »Weather in February
The weather pattern in February does not change radically from January, but a gradual transition towards spring is visible. Light showers, cloud cover, and moderate winds are still present in this time of the year. One of the noticeable increases is the relative humidity, up by 1% giving the air a slightly more moisture-rich feel. Weather in February »Weather in March
March announces the arrival of the spring season in San Jose. This month witnesses one of the highest rainfall volumes, an average of 0.83in, which is greeted by more sunlight with 12 daylight hours. Besides the rainfall, other signs of spring weather start to become noticeable. Weather in March »Weather in April
April marks the full swing of spring with warmer temperatures in San Jose. This month is considerably drier than March, and the city enjoys an increased amount of sunshine. However, the outstanding characteristic of April is rather the significant rise in its UV index, now at 5, indicating the intensifying sun. Weather in April »Weather in May
As the city of San Jose moves further into the spring season, May stirs a significant change in the weather dynamics. The additional transition of warmer temperatures is accompanied by a continuous reduction in rainfall, down to just 0.2in. Weather in May »Weather in June
The month of June signals the start of the summer season in San Jose. It offers a newfound balance between warmth and humidity, bringing about idyllic summer conditions. It should also be noted that June has the longest daylight hours, accumulating to roughly 14.7 per day. Weather in June »Weather in July
July, being the heart of the summer season in San Jose, witnesses the peak of temperatures. Maximum temperatures climb up to 82°F (27.8°C) while the month enjoys a relatively clear sky with only 6% cloud cover. Despite experiencing the highest temperatures, the month also sees lower wind speeds, barely reaching 4.7mph (7.6km/h). Weather in July »Weather in August
In August, the weather in San Jose remains in the firm grip of summer. The temperature continues to reside on the warmer side, and rainfall levels remain minimal. The month maintains warm temperatures from July, with humidity levels showing a slight increase. Weather in August »Weather in September
September weather in San Jose signifies the transition from summer to fall, bringing about a slight reduction in temperatures. Reflecting the change in the season, the daylight hours reduce to approximately 12.4 per day, yet the city enjoys a warm and dry climate. Weather in September »Weather in October
The month of October in San Jose is a charming mixture of extended summer and early autumn. The weather amalgamates warm temperatures with a gradual increase in rainfall to 0.16in and a slight drop in daylight hours. The wind speed remains consistent, averagely blowing at a speed of 4.4mph (7.1km/h). Weather in October »Weather in November
November embarks upon the late fall weather in San Jose. The temperatures begin to drop, and the daylight hours decrease as winter approaches. However, the noticeable change in November is the evident jump in rainfall to 0.39in, signaling that the rainier season is around the corner. Weather in November »Weather in December
December is the city's entry into the winter season, with a clear drop in temperature and a moderate increase in rainfall. The month experiences an average of 7.6 rainfall days, making it one of the rainier times of the year. Along with the decreased temperatures, the daylight hours also shorten to the annual minimum of 9.6 hours daily. Weather in December »Updated: Jul 24, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
In San Jose, during the entire year, the rain falls for 51.5 days and collects up to 4.06" (103mm) of precipitation.
January, February, November and December, with an average maximum UV index of 3, are months with the lowest UV index.
With an average relative humidity of 73%, March is the most humid month.
The month with the most rainfall is March, when the rain falls for 9.8 days and typically aggregates up to 0.83" (21mm) of precipitation.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from PST to PDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from PDT to PST.
The months with the least rainfall are June through August Rain falls for 1.2 days and accumulates 0.04" (1mm) of rain.
The month with the longest days is June, with an average of 14h and 42min of daylight.
The months with the highest UV index are June through August, with an average maximum UV index of 6.
Temperature records mark July as the warmest month, with highs averaging 82°F (27.8°C) and lows at 55.2°F (12.9°C).
July and September, with an average relative humidity of 60%, are the least humid months.
The month with the most sunshine is July, with an average of 12.1h of sunshine.
The coldest month in San Jose is December, with an average high-temperature of 56.5°F (13.6°C) and an average low-temperature of 43°F (6.1°C).
December has the shortest days of the year, with an average of 9h and 36min of daylight.
With an average of 6h of sunshine, December has the least sunshine of the year.
Average temperature
San Jose, CA
The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is December (56.5°F).
The month with the highest average low temperature is August (56.5°F).
The coldest month (with the lowest average low temperature) is December (43°F).
Average pressure
San Jose, CA
- Average pressure in January:
30.13"Hg - Average pressure in February:
30.08"Hg - Average pressure in March:
30.08"Hg - Average pressure in April:
30.04"Hg - Average pressure in May:
29.98"Hg - Average pressure in June:
29.92"Hg
- Average pressure in July:
29.93"Hg - Average pressure in August:
29.92"Hg - Average pressure in September:
29.92"Hg - Average pressure in October:
29.98"Hg - Average pressure in November:
30.07"Hg - Average pressure in December:
30.11"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The months with the lowest atmospheric pressure are June, August and September (29.92"Hg).
Average wind speed
San Jose, CA
- Average wind speed in January:
4.6mph - Average wind speed in February:
5.5mph - Average wind speed in March:
5.5mph - Average wind speed in April:
5.8mph - Average wind speed in May:
5.8mph - Average wind speed in June:
5.5mph
- Average wind speed in July:
4.7mph - Average wind speed in August:
4.5mph - Average wind speed in September:
4.4mph - Average wind speed in October:
4.4mph - Average wind speed in November:
4.5mph - Average wind speed in December:
5mph
The windiest months (with the highest average wind speed) are April and May (5.8mph).
The calmest months (with the lowest average wind speed) are September and October (4.4mph).
Average humidity
San Jose, CA
The month with the highest relative humidity is March (73%).
The months with the lowest relative humidity are July and September (60%).
Average rainfall
San Jose, CA
- Average rainfall in January:
0.63" - Average rainfall in February:
0.67" - Average rainfall in March:
0.83" - Average rainfall in April:
0.28" - Average rainfall in May:
0.2" - Average rainfall in June:
0.04"
- Average rainfall in July:
0.04" - Average rainfall in August:
0.04" - Average rainfall in September:
0.08" - Average rainfall in October:
0.16" - Average rainfall in November:
0.39" - Average rainfall in December:
0.71"
The wettest month (with the highest rainfall) is March (0.83").
The driest months (with the least rainfall) are June, July and August (0.04").
Average rainfall days
San Jose, CA
- Average rainfall days in January:
6.3 days - Average rainfall days in February:
6.1 days - Average rainfall days in March:
9.8 days - Average rainfall days in April:
6.7 days - Average rainfall days in May:
3.3 days - Average rainfall days in June:
1.2 days
- Average rainfall days in July:
1.2 days - Average rainfall days in August:
0.4 days - Average rainfall days in September:
2.1 days - Average rainfall days in October:
2.5 days - Average rainfall days in November:
4.3 days - Average rainfall days in December:
7.6 days
The month with the highest number of rainy days is March (9.8 days).
The month with the least rainy days is August (0.4 days).
Average daylight / Average sunshine
San Jose, CA
- Average daylight in January:
9h and 54min - Average daylight in February:
10h and 48min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 12min - Average daylight in May:
14h and 12min - Average daylight in June:
14h and 42min
- Average daylight in July:
14h and 24min - Average daylight in August:
13h and 30min - Average daylight in September:
12h and 24min - Average daylight in October:
11h and 12min - Average daylight in November:
10h and 12min - Average daylight in December:
9h and 36min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in January:
6h and 18min - Average sunshine in February:
6h and 18min - Average sunshine in March:
8h and 0min - Average sunshine in April:
10h and 24min - Average sunshine in May:
11h and 6min - Average sunshine in June:
11h and 48min
- Average sunshine in July:
12h and 6min - Average sunshine in August:
12h and 0min - Average sunshine in September:
11h and 12min - Average sunshine in October:
7h and 12min - Average sunshine in November:
6h and 42min - Average sunshine in December:
6h and 0min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 6h and 0min).
Average sunshine days
San Jose, CA
- Average sunshine days in January:
23.3 days - Average sunshine days in February:
20.8 days - Average sunshine days in March:
19.5 days - Average sunshine days in April:
22.8 days - Average sunshine days in May:
26.3 days - Average sunshine days in June:
28.2 days
- Average sunshine days in July:
28.6 days - Average sunshine days in August:
29.7 days - Average sunshine days in September:
26.8 days - Average sunshine days in October:
26.8 days - Average sunshine days in November:
24.4 days - Average sunshine days in December:
22.3 days
The month with the most sunshine days is August (29.7 days).
The month with the least sunshine days is March (19.5 days).
Average UV index
San Jose, CA
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover
San Jose, CA
The month with the most cloud cover is March (Cloud cover 35).
The month with the least cloud cover is July (Cloud cover 6).
Average visibility
San Jose, CA
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
