Vallejo, California offers a Mediterranean climate with warm to hot summers and cool, wet winters.
The warm season lasts from the end of May to mid-October, with daily high temperatures averaging above 75°F.
July is typically the hottest month, with average highs of 80°F and lows around 55°F (Climate and Average Weather Year Round in Vallejo).
During the cooler months, from late November to early February, Vallejo sees average high temperatures below 60°F.
Winters are marked by more rainfall, making it one of Northern California’s wetter areas with about 34 inches of rain yearly (Vallejo, CA Climate).
Despite the rain, Vallejo still receives a good amount of yearly sunshine, providing a balanced climate overall.
With its blend of comfortable summers and moderate winters, the weather in Vallejo is ideal for those who enjoy mild and predictable weather patterns.
The city’s favorable conditions make it an appealing destination for both visitors and residents alike (Climate & Weather Averages in Vallejo, California).
Average Temperature in Vallejo, California
The climate in Vallejo, California, is characterized by mild and temperate weather throughout the year.
The hottest month is July, with an average high temperature of 80°F and a low of 55°F.
During the warm season, which lasts from May 31 to October 14, the daily highs are above 75°F.
The cool season occurs from November 29 to February 8, with average daily high temperatures below 60°F.
The coldest month is January, with low temperatures averaging 37°F.
Here’s a quick overview:
| Month | Average High | Average Low |
|---|---|---|
| January | 57°F | 37°F |
| July | 80°F | 55°F |
| September | 80°F | 55°F |
Summer highs can reach up to the upper 70s and 80s, offering pleasant weather.
The winter lows fall to the mid-30s, which is relatively mild compared to other regions.
The mean temperature over the entire year is 58°F, making it a comfortable place to live.
Check out more about the average temperature in the area for specific details and trends.
Vallejo’s temperatures make it suitable for various outdoor activities year-round, as it rarely experiences extreme heat or cold.
Average Precipitation in Vallejo, California
Vallejo experiences varied precipitation throughout the year, primarily in the form of rain. Snow is virtually absent in this region, making rainfall the main form of precipitation.
Average Rainfall in Vallejo, California
Vallejo receives an average of around 38 inches of rain per year.
The rain is mostly concentrated in the wet season, which spans from late fall to early spring.
During the wettest months, particularly December and January, Vallejo sees the highest amounts of rainfall.
Weekly, these months can witness several days of rain, leading to increased water levels in rivers and reservoirs.
Most of the precipitation occurs during this period, with dry spells common during the summer months.
From May to September, the chance of rainfall is significantly lower, with some months experiencing almost no rain at all.
Average Snow in Vallejo, California
Snowfall in Vallejo is extremely rare. The city generally averages 0 inches of snow per year, making it an unusual event for residents.
Even during the coldest months, snow does not accumulate.
Occasionally, nearby higher elevations might see a bit of snow, but Vallejo itself remains snow-free.
The absence of snow makes winter much less harsh in comparison to other regions.
This zero-snow trend aligns with Vallejo’s mild winter temperatures and coastal climate.
For those interested in snow and ice, resources like snow and ice can provide more detailed information about snowy regions.
Average Sun in Vallejo, California
Vallejo is known for its sunny weather, with frequent clear skies and ample daily sunshine. The city enjoys a remarkable number of sunny days each year, which makes it an appealing place for those who love basking in the sun.
Average Daily Shortwave Solar Energy in Vallejo, California
Vallejo receives a substantial amount of shortwave solar energy throughout the year.
This type of energy is crucial for measuring the amount of sunlight that reaches the ground on any given day.
Shortwave solar energy is highest in the summer months.
During July, the city experiences the peak of this energy, correlating with the longest daylight hours and the highest UV index.
Residents and visitors can enjoy extended periods of sunshine, ideally suited for outdoor activities.
On average, Vallejo sees about 258 sunny days annually.
This number surpasses the US average of 205 sunny days.
The extended daylight and high amount of sunshine make Vallejo particularly attractive for those seeking sunny weather year-round.
Average Humidity in Vallejo, California
Vallejo, California, experiences varying humidity levels throughout the year.
January is the most humid month, with relative humidity averaging 80%.
In contrast, October typically sees the lowest average humidity at 71%.
Here’s a quick look at average humidity by month:
| Month | Average Humidity |
|---|---|
| January | 80% |
| February | 78% |
| March | 76% |
| April | 75% |
| May | 74% |
| June | 73% |
| July | 72% |
| August | 72% |
| September | 73% |
| October | 71% |
| November | 74% |
| December | 78% |
Vallejo has moderate humidity levels when compared to other parts of California.
The annual average humidity is 75%, providing a generally comfortable atmosphere.
The dew point also varies throughout the year.
In January, it tends to be higher, contributing to the overall feeling of dampness.
During summer months, the dew point is lower, providing a fresher and drier feel.
Relatively stable humidity levels ensure that Vallejo’s climate remains balanced.
Even during the lower humidity months, the air retains enough moisture to avoid being too dry or uncomfortable.
For more detailed information on Vallejo’s humidity and climate, you can check websites like Weather and Climate.
Average Wind in Vallejo, California
Vallejo, California experiences varying wind speeds throughout the year. The average wind in Vallejo generally hovers around 11 to 12 mph.
Windiest Month:
- The windiest month in Vallejo is typically April with average wind speeds reaching 12 mph.
- In contrast, the calmest month is usually September, with wind speeds averaging around 9 mph.
Wind Speeds by Month:
- January: 10 mph
- April: 12 mph
- July: 11 mph
- September: 9 mph
- December: 10 mph
Winds in Vallejo predominantly come from the west.
This consistent direction influences the local weather patterns, contributing to the average climate experience in the region.
The influence of wind in Vallejo impacts various activities, including sailing and outdoor sports.
Residents and visitors can often feel the cooling effect of the westerly winds, especially during the warmer months.
For more information on wind patterns, consult relevant articles.
Understanding these wind patterns can help in planning outdoor events and knowing what to expect year-round.
Average Air Quality in Vallejo, California
Vallejo’s air quality is typically good throughout the year.
The Air Quality Index (AQI) often falls within the “Good” category, which means that air pollution poses little or no risk to health.
Recent AQI Data:
- Lippizan Drive: AQI 28
- Skyline Drive: AQI 28
- Broadway Street: AQI 30
- Hermosa Avenue: AQI 34
Common Pollutants:
- PM2.5: Fine particulate matter less than 2.5 micrometers in diameter
- Ozone (O3): A reactive gas that poses health risks
Residents and visitors can plan their outdoor activities with the help of real-time AQI monitoring.
AccuWeather and IQAir provide forecasts and historical data, helping them make informed decisions.
Visibility:
- Generally clear, with good visibility most of the time
- Fog can occasionally impact visibility, especially in the early mornings
Pressure and Weather Conditions:
- Average pressure: around 30 inches of mercury (Hg)
- Typical weather includes mild temperatures and varying cloud cover
Monitoring the weather and AQI can ensure healthier daily living.
Topography of Vallejo, California
Vallejo, located in Solano County, California, features diverse terrain and elevations. The city’s coordinates are approximately 38.05938° N, 122.38755° W.
Vallejo’s topography includes rolling hills, flatlands, and waterfront areas.
The average elevation of Vallejo is about 45 meters (148 feet). This means the city has varied landscapes, making it unique and picturesque.
Elevation Details:
- Minimum Elevation: around -5 meters (-16 feet)
- Maximum Elevation: approximately 108 meters (354 feet) at Mare Island (explore further)
Vallejo is home to Mare Island, a significant landmark with historical importance. The island has an average elevation higher than the rest of the city.
Terrain Types:
- Hills: Vallejo has gentle rolling hills in several neighborhoods.
- Flatlands: Predominantly in industrial and residential areas.
- Waterfront: Prominent along the Napa River and Mare Island Strait.
Due to Vallejo’s proximity to bodies of water, such as the Napa River, the terrain gradually slopes downward as it approaches the waterfront.
The Napa County Airport is nearby, just north of Vallejo, adding to the navigational significance of the region.
Extreme Weather Events that Occur in Vallejo, California
Vallejo experiences a variety of extreme weather events throughout the year. These events can include heavy rain, heatwaves, and occasional hail.
Heavy Rain and Flooding:
Rainfall in Vallejo can sometimes be intense. Heavy rains may lead to flooding, especially during storm seasons. The city often prepares for these events by monitoring weather advisories.
Heatwaves:
During summer, Vallejo can experience heatwaves. Temperatures may rise above 100°F, causing health risks and increasing the likelihood of wildfires. It is important for residents to stay hydrated and cool during these periods.
Hail:
Although rare, hailstorms can occur in Vallejo. Hail can damage property and vehicles, so it’s essential to stay informed through weather alerts.
Windstorms:
Strong winds can sometimes sweep through Vallejo, causing power outages and property damage. The community is usually warned in advance to secure their homes and belongings.
Fog:
During the early mornings and late evenings, fog can be a common occurrence in Vallejo, affecting visibility and making travel difficult.
For more information on weather alerts, residents can visit Vallejo, CA Weather Advisories.
Best Time of the Year to Visit Vallejo, California
Vallejo, California offers a mild Mediterranean climate year-round. Each season provides unique weather patterns and activities. From warm summers to cool winters, visitors can enjoy pleasant temperatures and low rainfall.
What is Vallejo, California Like in Spring
Spring in Vallejo, which covers March, April, and May, is pleasant with mild temperatures. Highs range between 65°F and 75°F, while lows hover around 50°F.
This season is ideal for outdoor activities like hiking and waterfront strolls, aided by blooming flowers and comfortable weather.
Rainfall during spring is minimal, making for clear, sunny days. April averages minimal rain, making it one of the best months to visit for those who prefer dry weather.
Daylight saving time starts in March, which extends daylight hours for more evening activities.
What is Vallejo, California Like in Summer
Summer, lasting from June through August, sees warm and dry weather in Vallejo. High temperatures typically range from 75°F to 85°F, with July being the hottest month, averaging highs of 80°F.
Nighttime temperatures cool down to around 55°F to 60°F, providing a pleasant contrast.
Rain is scarce, making summer excellent for outdoor events and festivals.
Visitors can enjoy activities like visiting local parks, going to the beach, or exploring the waterfront.
The clear skies and extended daylight hours provide plenty of time for exploration.
What is Vallejo, California Like in Fall
Fall, from September to November, offers gradually cooling temperatures. Highs range from 70°F in September to about 60°F by November.
September and October are particularly favorable months with highs of around 76°F, making them great for visiting local vineyards and parks.
Rainfall starts to increase into November but remains manageable.
This season offers crisp morning air and comfortable afternoons, perfect for walking tours and outdoor dining.
The transition from daylight saving time in early November marks shorter days, but the weather remains inviting.
What is Vallejo, California Like in Winter
Winter in Vallejo spans December to February, characterized by cooler and wetter conditions.
Highs range from 55°F to 60°F, with lows dropping to around 40°F.
Despite the cooler temperatures, winters are mild compared to many other regions.
Rain is more common, particularly in December and January, with Vallejo receiving around 34 inches of rain annually.
Visitors can enjoy indoor activities such as museums and local eateries.
While outdoor activities are less frequent, sunny days still occur and can be quite enjoyable.