Riverside, California, offers a unique climate that appeals to many. Located in the United States, this city enjoys a Mediterranean climate marked by hot summers and mild winters.
The hottest month is August, with an average high temperature of 94°F, making it an ideal spot for those who love the heat.
Conversely, December is the coldest month, featuring an average low of 45.9°F.
Annually, Riverside experiences a cool season from November to March, where average daily high temperatures stay below 72°F.
This period is great for those who prefer moderate weather.
With limited rainy days and abundant sunshine, outdoor activities are feasible almost year-round.
Average Temperature in Riverside, California
Riverside, California experiences warm temperatures throughout the year.
January: The average high temperature is 68°F, with an average low of 44°F.
February: Highs reach around 68°F, and lows are about 45°F.
March: The temperatures rise slightly, with averages of 72°F for the high and 47°F for the low.
April: April sees warmer days with high temperatures around 76°F and lows at 50°F.
May: The average high temperature is 82°F, with low temperatures around 55°F.
By June, temperatures increase, with highs around 88°F and lows near 60°F.
July and August are the warmest months. In July, the average high temperature hits 94°F, and the average low is 65°F. August also sees average highs of 94°F with lows at 65°F (Temperature – ChaseDay.com).
September: As the summer ends, high temperatures average 89°F, and lows are about 62°F.
October brings cooler weather with average highs around 81°F and lows near 54°F.
November: High temperatures decrease to about 73°F, and lows are around 47°F.
In December, the average high temperature is 68°F, and the low averages 45°F. December is the coldest month of the year in Riverside.
Tables can help break down these temperatures by month for quick reference:
| Month | Avg High (°F) | Avg Low (°F) |
|---|---|---|
| January | 68 | 44 |
| February | 68 | 45 |
| March | 72 | 47 |
| April | 76 | 50 |
| May | 82 | 55 |
| June | 88 | 60 |
| July | 94 | 65 |
| August | 94 | 65 |
| September | 89 | 62 |
| October | 81 | 54 |
| November | 73 | 47 |
| December | 68 | 45 |
These consistent temperatures make Riverside a place with pleasant weather most of the year.
Average Precipitation in Riverside, California
Riverside, California experiences a varied pattern of precipitation throughout the year, with most rainfall occurring during the winter months. Snow is extremely rare, making it hardly a consideration for the region.
Average Rainfall in Riverside, California
Riverside sees significant variation in monthly rainfall. The wettest month is December, averaging about 2.44 inches of rain.
January and February also see considerable rainfall, contributing to the total annual precipitation of around 12-14 inches.
From March through November, the city experiences dry periods with minimal rainfall.
During the dry months, the average monthly rainfall often drops below 0.5 inches.
The driest months are typically June through September, with July frequently seeing almost no rain.
This seasonal pattern means that residents and visitors can expect more rainy days in winter, but mostly clear skies and dry conditions in summer.
Average Snow in Riverside, California
Snowfall in Riverside is extraordinarily rare due to the city’s warm climate. The average low temperatures seldom drop to levels that support snow formation.
On the rare occasions when snow does occur, it is usually in trace amounts that do not accumulate significantly.
The mild winter temperatures, often staying well above freezing, further reduce the likelihood of snow.
For those interested in more detailed information on snow and ice phenomena, additional insights can be found in articles about snow and ice. However, for practical purposes, snow is not a factor that significantly impacts life or activities in Riverside.
Average Sun in Riverside, California
Riverside enjoys abundant sunshine throughout the year, with long daylight hours and high levels of UV index during the summer. Here is a detailed look into the average daily shortwave solar energy received in Riverside.
Average Daily Shortwave Solar Energy in Riverside, California
Riverside averages about 6.7 kWh/m² of shortwave solar energy per day.
The highest solar energy is received in June, averaging 7.9 kWh/m². In December, it drops to 4.6 kWh/m².
The city experiences nearly 278 sunny days annually, providing ample sunshine hours for outdoor activities.
During peak summer months, the sun rises around 5:45 AM and sets around 8:00 PM, offering extended daylight hours.
High UV index levels, especially in summer, recommend sun protection.
For detailed climate specifics, visit Climate and Average Weather Year Round in Riverside.
Average Humidity in Riverside, California
Riverside, California experiences varying humidity levels throughout the year.
The average relative humidity typically ranges from 47% in the dryer months to around 56% during the more humid season. The most humid months are December and January.
The dew point, which indicates the temperature at which air becomes saturated with moisture, ranges between 33°F and 55°F. This reflects a moderate level of moisture in the air.
| Month | Average Relative Humidity (%) | Dew Point (°F) |
|---|---|---|
| January | 56 | 41 |
| February | 54 | 40 |
| March | 52 | 41 |
| April | 49 | 42 |
| May | 47 | 43 |
| June | 48 | 47 |
| July | 52 | 55 |
| August | 50 | 54 |
| September | 48 | 49 |
| October | 48 | 45 |
| November | 51 | 38 |
| December | 56 | 33 |
Average Wind in Riverside, California
The average wind speed in Riverside varies throughout the year. Typically, the wind speed is around 8 mph.
Wind speeds can dip to about 6 mph during the calmest months. The windiest month is usually April, with average speeds around 9 mph.
Occasional gusts can reach higher speeds, especially during certain weather events. For those interested in wind patterns, Riverside’s average wind speeds offer a reliable overview.
Average Air Quality in Riverside, California
Riverside, California, typically experiences varied air quality throughout the year. Factors like traffic, industrial activities, and weather conditions play significant roles.
The summer months often see an increase in PM2.5 and PM10 levels due to heightened vehicle emissions and dryer conditions.
According to IQAir, air quality indices in different areas such as Rubidoux Riverside are usually moderate, often hovering around AQI 50-60.
During fall and winter, air quality can improve. Some areas like Mira Loma-Van Buren can have AQI levels as low as the 40s.
Weather conditions such as pressure and cloud cover can influence pollutant dispersion, leading to better air.
Sample Air Quality Data
| Location | AQI Level | Status |
|---|---|---|
| Rubidoux Riverside | 50-60 | Moderate |
| Mira Loma-Van Buren | 53-59 | Good |
| Wood Streets | 60 | Moderate |
| Abraham Lincoln HS Lot | 97 | Moderate |
| Jurupa Valley | 64 | Good |
| Riverview Drive | 46-72 | Good |
Some of the low AQI levels can be linked to clear weather conditions where visibility is high due to lesser cloud cover.
Pressure ranges also impact how much pollution stays in the lower atmosphere. Lower pressure often leads to better air quality since pollutants can rise and disperse.
Topography of Riverside, California
Riverside is located in Riverside County, California. Its coordinates are approximately 33.87242° N latitude and 117.52376° W longitude.
The city has a diverse range of elevations.
The average elevation of Riverside is 1,152 feet.
- Minimum elevation: 627 feet
- Maximum elevation: 3,058 feet
Riverside spans from hilly terrains to lower flatlands.
This variation in elevation provides the city with diverse landscapes and scenic views.
Riverside’s terrain influences its climate and weather patterns.
The higher areas can experience cooler temperatures, while the lower areas can be warmer, especially during summer.
Riverside’s location in the inland region of Southern California also means it is somewhat shielded from the coastal marine layer, resulting in more pronounced temperature variations.
Extreme Weather Events that Occur in Riverside, California
Riverside, California, often experiences extreme weather events, greatly impacting its residents and landscape.
Flash floods are common during heavy rains, especially in the summer.
These can be sudden and dangerous.
The National Weather Service frequently issues warnings for the area due to the quick buildup of rainfall.
High temperatures and dry conditions contribute to wildfires.
Most recently, the Hawarden Fire spread over 500 acres in July 2024.
These fires can lead to evacuations and extensive property damage.
Heatwaves:
Riverside often sees temperatures soaring above 90°F during summer months.
These periods of extreme heat pose health risks, particularly to vulnerable populations.
Adequate hydration and cooling measures are crucial during these times.
Summer thunderstorms can be intense, bringing heavy rain, lightning, and strong winds.
They can cause damage and power outages.
Frequent thunderstorms increase the risk of both flash flooding and wildfires due to lightning strikes.
Historical Floods:
In addition to recent events, historical records show severe floods such as the “Noachian Deluge of California” from December 1861 to January 1862.
Streets were submerged, causing significant damage (source: PDF on significant weather events in Southern California).
Best Time of the Year to Visit Riverside, California
Riverside, California, offers unique weather experiences throughout the year. From mild winters to hot summers, each season has its own charm.
What is Riverside, California Like in Spring
Spring in Riverside, California, spans from March to May.
During this period, temperatures range between 50°F and 75°F.
Spring offers pleasant weather, perfect for outdoor activities.
Rainfall is minimal, making it ideal for hiking or exploring local parks.
The city sees blooming flowers and lush landscapes.
Tourists can comfortably roam the streets and visit attractions without the scorching heat of summer.
Compared to other seasons, hotel rates are reasonable, and popular spots are less crowded.
This makes spring a favorable time for a peaceful visit.
What is Riverside, California Like in Summer
Summer in Riverside lasts from June to August and is known for its hot and dry climate.
Temperatures often soar above 90°F, with July and August being the hottest months.
This weather is perfect for poolside relaxation and water sports.
Tourists often flock to waterparks and enjoy long daylight hours for sightseeing and activities.
While the heat can be intense, air conditioning in indoor attractions and accommodations provide relief.
The clear skies and minimal rainfall make summer a popular time for outdoor events and festivals.
What is Riverside, California Like in Fall
Fall in Riverside runs from September to November.
Temperatures cool down from summer highs and range between 60°F to 85°F.
The mild weather and lower humidity make this season perfect for outdoor events and activities.
The city experiences beautiful fall foliage, adding color to parks and streets.
Tourists can enjoy wine tasting trips and harvest festivals.
Hotel rates remain moderate, and the weather is more comfortable than in summer.
Fall is an excellent time for both relaxation and exploring cultural events.
What is Riverside, California Like in Winter
Winter in Riverside spans from December to February.
Although it is cooler than other seasons, temperatures remain mild, ranging from 45°F to 70°F.
This makes winter pleasant for those looking to escape harsher winter climates.
Occasional rains add freshness to the air, and the nights can get chilly.
It rarely snows, maintaining ease of travel.
The holiday season brings festive events and decorations, making it a charming period for a visit.
Hotels may offer offseason rates, making it an affordable time to explore the region.
For more detailed weather insights, Riverside’s climate year-round guide provides comprehensive information.