San Jose, California, nestled in the heart of Silicon Valley, offers a unique blend of climate characteristics throughout the year.
The city experiences long, warm, and mostly clear summers, while winters are short, cold, and partly cloudy.
Throughout the year, temperatures typically range from 43°F to 82°F, providing a pleasant environment for residents and visitors alike.
Summer in San Jose is ideal for those who enjoy warm weather. From June to August, the city sees its highest temperatures, often peaking around 92°F. Meanwhile, rainfall remains minimal, making outdoor activities highly enjoyable.
For more detailed weather information, refer to the Climate and Average Weather Year Round in San Jose.
In contrast, winter brings cooler temperatures and more precipitation. From December to February, temperatures can drop to 35°F, with more frequent rain.
Despite these conditions, the cooler months are relatively mild compared to other parts of the United States, keeping San Jose a desirable location year-round.
For a comprehensive climate graph, visit Yearly & Monthly Weather – San Jose, CA.
Average Temperature in San Jose, California
San Jose experiences a mild and pleasant climate year-round.
The warmest part of the year lasts from early June to mid-October, with average high temperatures above 78°F.
July stands out as the hottest month, seeing average highs around 82°F and lows around 60°F.
In contrast, the cooler season spans late November to mid-February. During these months, average daily highs are below 63°F.
The coldest month is January, with average high temperatures near 60°F and lows around 42°F.
Monthly Average Temperatures
| Month | High (°F) | Low (°F) |
|---|---|---|
| January | 60 | 42 |
| February | 63 | 44 |
| March | 66 | 46 |
| April | 70 | 48 |
| May | 74 | 53 |
| June | 78 | 56 |
| July | 82 | 60 |
| August | 82 | 60 |
| September | 80 | 58 |
| October | 74 | 52 |
| November | 64 | 45 |
| December | 59 | 42 |
On some nights, temperatures can drop to 32°F, but such occurrences are rare.
San Jose typically sees just one day per year when the temperature reaches 100°F or higher.
San Jose also has mild temperatures thanks to its Mediterranean climate. This ensures comfortable weather most of the year, contributing to its appeal as a place to live.
Reliable data on temperature can be consistently found, indicating long-term averages and providing a clear picture of the weather patterns.
Average Precipitation in San Jose, California
San Jose experiences varying levels of rainfall throughout the year, but snow is almost non-existent due to its mild weather.
Average Rainfall in San Jose, California
San Jose has a dry summer and wetter winter.
The wettest month is January with average rainfall of about 3.4 inches.
March and December also see significant precipitation, while June through September are the driest months, often getting less than 0.1 inches each.
- January: 3.4 inches
- February: 2.6 inches
- March: 2.3 inches
- April: 1.0 inches
- May: 0.5 inches
- June: 0.1 inches
- July: 0.0 inches
- August: 0.0 inches
- September: 0.1 inches
- October: 1.2 inches
- November: 2.0 inches
- December: 2.7 inches
This pattern demonstrates the typical Mediterranean climate of San Jose, characterized by wet winters and dry summers.
Average Snow in San Jose, California
San Jose rarely sees snow as temperatures seldom drop low enough for snow to form.
The city’s elevation and proximity to the coast ensure mild winters even during the coldest months.
Snow events are extremely rare and usually confined to the higher elevations outside the city.
Those interested in more details about snow in nearby regions or specific snow events can find information on topics like snow and ice conditions and forecasts.
San Jose’s absence of snow makes it a favorable destination for those seeking comfortable winter weather.
Average Sun in San Jose, California
San Jose enjoys a generous amount of sunshine throughout the year. Residents can expect clear and sunny skies, especially from spring to fall.
Average Daily Shortwave Solar Energy in San Jose, California
San Jose experiences high levels of shortwave solar energy, peaking during summer.
The average daily shortwave solar energy is highest in June at approximately 7.7 kWh per square meter.
Winter months, like December, see lower levels, averaging around 3.0 kWh per square meter.
San Jose also has long days in summer, with sunrise around 5:52 AM and sunset around 8:30 PM.
Meanwhile, winter days are shorter, with sunrise at about 7:15 AM and sunset by 5:00 PM.
The area’s climate typically offers many hours of sunshine, enhancing its appeal for outdoor activities year-round.
Average Humidity in San Jose, California
San Jose experiences a mostly comfortable level of humidity throughout the year. The average annual relative humidity is around 75%.
In January, which is the most humid month, the average humidity is approximately 80%.
October is the least humid month, with an average of around 71%.
| Month | Average Humidity |
|---|---|
| January | 80% |
| February | 79% |
| March | 78% |
| April | 76% |
| May | 74% |
| June | 73% |
| July | 72% |
| August | 73% |
| September | 72% |
| October | 71% |
| November | 74% |
| December | 77% |
The average dew point also contributes to the comfort level.
For example, in January, the dew point averages around 48°F.
During the summer, the dew point is typically lower, which makes hotter months more comfortable.
Dew points can drop to as low as 42°F during the driest months.
San Jose’s overall climate can be described as relatively mild, owing to its consistent humidity levels.
For more comprehensive data on humidity, you can refer to detailed sources such as Weather & Climate Information from World Weather & Climate Information.
Average Wind in San Jose, California
Wind in San Jose is relatively mild throughout the year. The average wind speeds are generally low, making it a comfortable place for outdoor activities.
During the windier months, such as April and May, wind speeds average around 7.4 mph. This makes these months the windiest periods in the area.
On the other hand, December and January are usually the least windy, with speeds dropping to around 5.6 mph.
Wind Speeds by Month:
| Month | Average Wind Speed (mph) |
|---|---|
| January | 5.6 |
| February | 6.2 |
| March | 6.8 |
| April | 7.4 |
| May | 7.4 |
| June | 7.2 |
| July | 7.0 |
| August | 6.8 |
| September | 6.6 |
| October | 6.4 |
| November | 6.0 |
| December | 5.6 |
Wind patterns in San Jose are influenced by surface movements, which are typically mild. While some days may experience stronger gusts, these are infrequent.
Average Air Quality in San Jose, California
San Jose’s air quality varies throughout the year.
Generally, the air quality index (AQI) in the city averages a “good” rating. This is based on ratings from IQAir and AccuWeather.
Monthly Variations
- January to October: The AQI is typically under 50, meaning the air quality is good.
- November: Air quality tends to worsen, with an AQI averaging 59, which is considered moderate.
PM2.5 Levels
- Average Yearly PM2.5 Concentration: 6.4 μg/m³
- Higher Levels in November: 15.9 μg/m³
Real-Time Data
Residents can check real-time conditions through platforms like IQAir and AccuWeather. These sources provide up-to-date PM2.5 and weather data.
Common Monitoring Stations
- San Jose – Jackson Street: AQI 41
- San Jose – Knox Ave: AQI 49
- Westmont: AQI 53
- Naglee Park: AQI 54
Additional Factors
- Visibility: Typically good, but can decrease during periods of high particulate matter.
- Pressure: Affects the dispersal of pollutants but specific ranges are not detailed in the sources.
San Jose residents are advised to check local air quality reports to make informed decisions about outdoor activities. This is especially important during higher pollution times such as in November.
Topography of San Jose, California
San Jose is located in Santa Clara County, California. The city spans a variety of elevations, with an average elevation of 866 feet.
The coordinates of San Jose are approximately 37.34° N latitude and 121.89° W longitude, placing it in the heart of Silicon Valley. These coordinates contribute to its unique topography and climate.
Elevation Range
- Average Elevation: 866 feet
- Minimum Elevation: -7 meters (below sea level)
- Maximum Elevation: Varied, but higher elevations are seen around the hills and valleys
San Jose’s terrain includes rolling hills, flatlands, and valleys. The elevation contributes to the mild and semi-arid climate that characterizes the region.
Nearby Landmarks
San Jose is not far from the San Francisco International Airport, which lies to the northwest of the city. The airport’s proximity facilitates easy travel and contributes to the connectivity of the region.
Terrain Map
For a detailed view, visit the San Jose topographic map. This map provides visual insights into the elevation and terrain features of the area.
Climate Impact
The elevation and topography of San Jose influence its climate. With elevations ranging from below sea level to over 800 feet, the temperature variations and precipitation are also affected. The city experiences mild winters and warm summers, with average annual precipitation at about 18.5 inches.
Extreme Weather Events That Occur in San Jose, California
San Jose, California, experiences several extreme weather events throughout the year. These events can include heavy rain, strong winds, and occasionally, extreme temperatures.
Flooding is a significant concern in San Jose during the wet season. Heavy rainstorms can lead to the overflowing of rivers and creeks. This can result in road closures and property damage. For example, the city had notable flooding during a recent storm that resulted in regional power outages.
High Winds are also common in San Jose, particularly during storms. Winds can reach up to 100 mph in some areas. These winds can cause tree branches to fall, leading to power outages and potential hazards for residents.
Freezing temperatures are rare but can occur. During rare cold snaps, temperatures can drop below freezing (32°F) at night. This can affect local vegetation and unprepared residents.
Heatwaves are another extreme weather event in San Jose. Summer temperatures can sometimes soar above 100°F. During heatwaves, residents are at risk for heat-related illnesses, and energy consumption spikes due to increased use of air conditioning.
Wildfires pose a risk, particularly in the late summer and fall. Dry conditions and strong winds can contribute to the spread of fires. These fires can affect air quality and cause evacuations.
Rainfall:
- Average annual rainfall: ~15 inches
- Heavy rain events can lead to flooding
Temperature Extremes:
- Winter low: Occasionally below 32°F
- Summer high: Frequently above 90°F, sometimes over 100°F
Best Time of the Year to Visit San Jose, California
San Jose, California, offers a unique climate with a warm, pleasant atmosphere most of the year. Visitors can enjoy mild winters, warm summers, and delightful spring and fall seasons.
What Is San Jose, California Like in Spring
Spring in San Jose, from March to May, features mild temperatures. Daytime highs usually range from 60°F to 70°F. The rainy season tapers off, with occasional showers adding to the city’s lush greenery.
Wildflowers bloom, making it a great time for outdoor activities like hiking in nearby parks. Visitors can enjoy events like the cherry blossom festival and local farmers markets bursting with fresh produce.
Sunshine is abundant, providing excellent conditions for exploring downtown or visiting nearby attractions like the Tech Museum of Innovation.
What Is San Jose, California Like in Summer
Summer in San Jose, from June to August, brings warm and dry weather. Average temperatures range from 80°F to 90°F during the day, with cooler evenings around 60°F. July is typically the hottest month.
No rain means perfect conditions for outdoor festivals, concerts, and trips to the Santa Cruz Mountains. The clear skies are ideal for stargazing or picnics, and local vineyards are in full swing.
Beaches along the coast are just a short drive away, offering a refreshing escape from the inland heat.
What Is San Jose, California Like in Fall
Fall in San Jose occurs from September to November and offers pleasant weather with temperatures between 70°F and 80°F. The summer heat diminishes, and the crisp air marks the start of harvest season.
Local wineries and farms host events such as grape stomps and apple picking. The fall foliage in nearby parks and hiking trails adds vibrant colors, perfect for photography and leisurely walks.
With fewer tourists, it’s a quieter period to explore the city’s cultural attractions and outdoor spaces.
What Is San Jose, California Like in Winter
Winter in San Jose, from December to February, is mild and offers a welcome respite from the rainier months.
Daytime temperatures average between 50°F and 60°F, with nights cooling to the low 40s°F.
This is the season to enjoy indoor activities such as visiting museums, theaters, and local dining spots.
Nearby destinations like San Francisco and Monterey remain accessible for quick trips.
Clear, crisp days are still common, ideal for exploring historic sites and taking walks in the many regional parks without the large summer crowds.