Nestled in the heart of Ventura County, Simi Valley is known for its pleasant climate and inviting weather year-round.
Summers in Simi Valley are characterized by their hot, arid conditions with clear skies, making it a perfect destination for sun lovers.
Temperatures often reach 93°F during the hotter months, allowing residents and visitors to enjoy plenty of sunny days.
The city experiences nearly 3454 hours of sunshine annually, ensuring ample opportunity for outdoor activities.
As the seasons change, Simi Valley’s winters bring cooler and wetter weather.
Average temperatures during the winter months tend to hover around 45°F, with occasional rain bringing a refreshing contrast to the dry summer heat.
Despite the cooler weather, the sky remains partly cloudy, allowing for a mix of sunny and overcast days.
With an average annual temperature of around 60°F, the region maintains a mild and comfortable climate.
Weather in Simi Valley caters to a variety of preferences.
From the sun-drenched summers to the mild winters, this diverse climate makes it an appealing location for those seeking balance in their weather patterns.
Whether you’re planning activities or considering a move, understanding the weather patterns can help you make the most of what Simi Valley has to offer.
Average Temperature In Simi Valley, California
Simi Valley experiences hot summers and mild winters. The temperature typically ranges from 46°F to 87°F.
Monthly Averages:
- January Low: 46°F
- July High: 95°F
Hottest month: August, with a maximum temperature around 93°F.
Coldest month: January, with temperatures often dropping to 46°F.
Annual Temperature Overview
| Month | Average High (°F) | Average Low (°F) |
|---|---|---|
| January | 68°F | 46°F |
| February | 67°F | 46°F |
| March | 70°F | 48°F |
| April | 74°F | 50°F |
| May | 78°F | 54°F |
| June | 85°F | 59°F |
| July | 95°F | 65°F |
| August | 93°F | 64°F |
| September | 90°F | 62°F |
| October | 82°F | 55°F |
| November | 72°F | 48°F |
| December | 67°F | 46°F |
Summary
The average yearly temperature is around 60°F. Simi Valley enjoys a warm climate, making it suitable for outdoor activities year-round.
Average Precipitation In Simi Valley, California
Simi Valley experiences varying amounts of rain throughout the year, with most rainfall occurring in the winter months. Snow is a rare event in this region due to its mild climate.
Average Rainfall In Simi Valley, California
Rainfall in Simi Valley is unevenly distributed throughout the year.
The city’s wettest month is January, with precipitation averaging 2.44 inches.
February also sees significant rainfall, contributing greatly to the yearly average of 14.4 inches.
The summer months generally record minimal precipitation, making outdoor activities more enjoyable.
Average Snow In Simi Valley, California
Snowfall in Simi Valley is extremely rare due to its warm climate.
The city does not typically record any snowfall during the year, with temperatures remaining far above freezing.
In rare cases, a dusting of sleet may occur during colder winter months, but this is not the norm.
While some areas in California receive significant snow, Simi Valley remains largely snow-free, ensuring that daily life and travel remain largely uninterrupted by winter weather.
These snowfall data points reflect Simi Valley’s warm and mild weather conditions, distinguishing it from more mountainous or northern regions known for snow.
Average Sun In Simi Valley, California
Simi Valley, California, enjoys a substantial amount of sunshine throughout the year. The city experiences long daylight hours and consistent sunlight, making it a bright and appealing place to live.
Average Daily Shortwave Solar Energy In Simi Valley, California
Throughout the year, Simi Valley receives a significant amount of daily shortwave solar energy.
This energy varies slightly from month to month.
In August, the area can receive around 7.5 kilowatt-hours per square meter each day.
This level of solar energy remains pretty consistent, fluctuating slightly based on the season.
During the summer months, Simi Valley sees the highest amount of sunshine, with longer daylight periods.
Winters, while cooler, still provide plenty of sunlight, with the daily solar energy levels dropping only a bit.
This consistent sunshine contributes to the city’s mild and sunny climate, making it ideal for outdoor activities year-round.
On average, Simi Valley experiences about 3453.66 hours of sunshine annually.
This means residents can enjoy approximately 9.5 hours of sunlight every day.
The average UV index also stays fairly high, so wearing sun protection is advised throughout the year.
This consistent sunlight not only brightens the area but also supports various solar energy initiatives and benefits those who enjoy outdoor sports and activities.
Average Humidity In Simi Valley, California
The average humidity in Simi Valley varies throughout the year. Typically, the relative humidity ranges from about 50% to 70%.
In the drier months, like July and August, the average humidity can fall to around 50%. This makes the air feel less sticky and more comfortable.
During the wetter months, like February, the relative humidity can climb to about 70%.
This increase is due to more frequent rainy days and higher dew points.
Here’s a quick look at Simi Valley’s average humidity by month:
| Month | Average Humidity |
|---|---|
| January | 67% |
| February | 70% |
| March | 65% |
| April | 60% |
| May | 58% |
| June | 55% |
| July | 50% |
| August | 50% |
| September | 52% |
| October | 55% |
| November | 60% |
| December | 64% |
Dew point temperatures also play a role in how humid it feels.
In Simi Valley, the dew point ranges from the mid-30s to mid-50s °F over the year.
In the summer, lower dew points mean less moisture in the air.
This is why despite high temperatures, summer days can feel relatively dry.
Conversely, in the winter, higher dew points contribute to the increased humidity.
Periods with higher relative humidity and rainy days can make the air feel much heavier and slightly uncomfortable for some.
For more details on Simi Valley’s climate, visit the weather page.
Average Wind In Simi Valley, California
In Simi Valley, the wind patterns vary throughout the year.
The average wind speed in August is about 5.1 mph.
This area experiences different wind speeds each month.
Winter months tend to be calmer. Compared to August, the rest of the year has slightly higher average wind speeds.
The windiest month is typically in the spring, with March often experiencing winds up to 10-15 mph.
Residents can expect frequent winds from the southwest, which help in maintaining clear visibility across the valley.
Wind is an important component of Simi Valley’s weather, contributing to its mild and sunny climate.
During summer, cooler coastal winds bring relief from the heat, making conditions more comfortable.
Average Air Quality In Simi Valley, California
The air quality in Simi Valley, California varies throughout the year. It is often categorized using the Air Quality Index (AQI), which measures pollutants like PM2.5 and PM10.
AQI Values
- Good: AQI 0-50
- Moderate: AQI 51-100
- Unhealthy for Sensitive Groups: AQI 101-150
Example Readings
- June 30: AQI was Good at 48.
- PM2.5 levels can be around 13μg/m³, indicating moderate air quality here.
Weather Impact
Temperature and weather conditions also play a role.
Simi Valley typically experiences temperatures like 87.8°F during the day and 64.4°F at night in summer reference.
Sun Hours
The region enjoys plenty of sunshine, contributing to overall air quality.
This affects the dispersion of pollutants and the formation of ozone.
By tracking these aspects, residents can make informed decisions about outdoor activities.
Topography Of Simi Valley, California
Simi Valley is located in California, roughly 40 miles northwest of Los Angeles.
The city rests in a valley surrounded by the Santa Susana Mountain range to the north and the Simi Hills to the south. This positioning provides a natural bowl-like shape to the area.
Elevation and Coordinates
The elevation of Simi Valley varies across the region.
On average, it sits at about 700 feet above sea level, though some areas can reach up to 1,000 feet.
The city’s geographic coordinates are approximately 34.2694° N latitude and 118.7815° W longitude.
Terrain Features
The valley floor is relatively flat, making it suitable for urban development, agriculture, and parks.
The surrounding hills and mountains provide a mix of rugged terrain and natural beauty, contributing to a diverse landscape. This mix of flat and rocky areas helps in defining Simi Valley’s unique topography.
The Santa Susana Mountains and Simi Hills are composed mainly of sedimentary rocks, which contribute to the region’s geological diversity.
Creeks and rivers, although dry most of the year, carve through these formations adding to the geographical variations.
Vegetation
Natural vegetation includes chaparral, oak woodlands, and grasslands.
This types of flora are well-adapted to the hot, dry summers and cooler, wet winters characteristic of the area.
Climate Impact
The topography influences the local climate significantly.
The surrounding hills help shield the valley from harsh weather, leading to milder conditions. The hot summers and cool winters are typical of Mediterranean climates, prevalent throughout much of California.
For more detailed information on the weather and climate in Simi Valley, visit the climate summary page.
Extreme Weather Events That Occur In Simi Valley, California
Simi Valley, California, experiences several extreme weather events throughout the year.
Heatwaves
One of the most common extreme weather events in Simi Valley is heatwaves.
During summer, temperatures can rise significantly, sometimes exceeding 100°F. These heatwaves increase the risk of heat-related illnesses.
Wildfires
Wildfires are another significant threat.
The dry conditions and high temperatures create a perfect environment for wildfires, especially in late summer and fall. Strong winds can spread the fires quickly, causing widespread damage.
Flooding
Simi Valley is also prone to flooding, especially during heavy rain events.
For instance, historical data shows that Southern California experienced severe floods in the 19th century, such as the 1858 hurricane and the 1861-1862 floods.
Santa Ana Winds
The region frequently experiences Santa Ana winds, which are strong, dry winds that can reach speeds of 40-60 mph.
These winds can exacerbate wildfire conditions by drying out vegetation and spreading flames.
Hail
Hailstorms are less common but do occasionally occur.
Hail can cause damage to crops, vehicles, and buildings.
Climate Change Impact
Climate change is expected to increase the frequency and severity of these extreme weather events.
Projections indicate that the daily maximum average temperature could rise significantly, increasing the likelihood of heatwaves and other extreme weather events.
For current severe weather alerts and updates, residents can check resources like Weather Underground (Simi Valley, CA Severe Weather) or AccuWeather (Simi Valley, CA Weather Advisories).
Best Time Of The Year To Visit Simi Valley, California
Simi Valley offers a variety of experiences throughout the year, each season bringing unique weather and activities. Exploring the best times to visit can help you plan the perfect trip.
What Is Simi Valley, California Like In Spring
Spring in Simi Valley is mild and pleasant.
From March to May, temperatures range between 68°F and 77°F. This makes it a great time for outdoor activities like hiking and exploring the local parks.
Rainfall is minimal during these months, averaging just a few inches per month. Wildflowers bloom across the region, adding vibrant colors to the landscape. Daylight saving time also gives more daylight hours, perfect for sightseeing.
What Is Simi Valley, California Like In Summer
Summer in Simi Valley is hot and dry.
From June to August, temperatures often reach between 85°F and 95°F, with an average high of 87°F in July and August.
It’s the perfect time for poolside relaxation and picnics in the parks. Because it’s the driest season, you can expect clear skies almost every day. Be prepared for the heat and stay hydrated. Sunrise comes early, giving long days for exploring.
What Is Simi Valley, California Like In Fall
Fall in Simi Valley is comfortable and gradual.
September through November sees temperatures dropping from 80°F to 70°F. This season is ideal for visits to the local vineyards and historic landmarks.
The weather is still warm, but more manageable compared to summer. Rain remains scarce until late November. Fall foliage can be seen in some areas, creating picturesque settings for photographs.
What Is Simi Valley, California Like In Winter
Winter in Simi Valley is cool and wetter.
December through February, temperatures range from 47°F to 67°F.
While the weather is too cold for swimming, it’s still mild compared to many other regions in the United States.
Rainfall is more frequent, occurring 3 to 5 times per month.
The cooler temperatures and occasional rain showers create a cozy atmosphere, perfect for indoor activities like visiting museums and galleries.