Riverside County Climate and Average Weather
Climate of Riverside County: average temperatures, rainfall and seasons month by month.
Climate in Riverside County month by month
Average high, average low and total rainfall, based on three years of reanalysis data.
| Month | Avg high | Avg low | Rainfall | Rating |
|---|---|---|---|---|
| January | 67° | 45° | 1,8 in | ★★★★☆ |
| February | 68° | 47° | 4,5 in | ★★★☆☆ |
| March | 73° | 50° | 2,3 in | ★★★★☆ |
| April | 75° | 52° | 0,8 in | ★★★★★ |
| May | 81° | 56° | 0,2 in | ★★★★★ |
| June | 89° | 61° | 0,0 in | ★★★★★ |
| July | 95° | 66° | 0,1 in | ★★★★★ |
| August | 96° | 67° | 0,5 in | ★★★★★ |
| September | 90° | 64° | 0,9 in | ★★★★★ |
| October | 85° | 57° | 0,6 in | ★★★★★ |
| November | 73° | 49° | 2,2 in | ★★★★☆ |
| December | 70° | 46° | 1,5 in | ★★★★☆ |
Climate type: Mediterranean. Source: Open-Meteo archive (ERA5).
Recent extremes in Riverside County
Highest and lowest readings observed in the last 3 years of reanalysis data - not all-time records.
How Riverside County compares with nearby places
Annual averages, and the difference against Riverside County.
| Place | Distance | Avg temp | vs here | Annual rain |
|---|---|---|---|---|
| Orange County | 30 mi | 64°F | 34°F cooler | 16 in |
| Disneyland Resort | 32 mi | 65°F | 33°F cooler | 20 in |
| ZIP Code 90001 | 49 mi | 65°F | 33°F cooler | 19 in |
| Los Angeles County | 49 mi | 65°F | 33°F cooler | 22 in |
| Los Angeles | 49 mi | 65°F | 33°F cooler | 22 in |
Best time to visit Riverside County
Go in April, May, June, July, August, September and October. These months score highest on comfortable temperatures, low rainfall and useful daylight.
Hardest months: January, February and December - expect the least comfortable mix of heat, cold or rain.
What this means for Riverside County
Today is slightly warmer than average for August. The forecast high of 103°F is 7°F above the 96°F typical for this month.
Rain is very unlikely today - plans do not need a backup.
No weather-related travel disruption is expected today. Roads and airports should run normally.
Northern Hemisphere, so peak summer falls in June to August.
The gap between the warmest and coldest month averages 57°F.
What to pack, what to skip
- Lightweight, light-coloured clothing and a refillable water bottle
- Sunglasses, a brimmed hat and SPF 30+
- Avoid long hikes after mid-morning; start at dawn or leave it for a cooler day.
- If your dates are flexible, avoid January, February and December - historically the least comfortable months here.
Summary
Riverside County is a county in California. Riverside County is a county in the United States. It has a population of about 2.5 million.
Right now it is 91°F (33°C) in Riverside County with clear. It feels like 89°F. Today runs from 71°F to 103°F. Chance of precipitation is 0%. Sightseeing conditions score 8.5/10 - excellent - go now.
The best time to visit Riverside County is April, May, June, July, August, September and October. The climate is Mediterranean. January, February and December tend to be the least comfortable months. August is the warmest month with average highs near 96°F, while January is the coldest with lows near 45°F.
The closest major airport is Los Angeles International Airport (LAX), about 58 mi away. Nearby highlights include Disneyland Resort, Hollywood Sign, Santa Monica State Beach and Anza-Borrego Desert State Park.
In plain terms. Today is slightly warmer than average for August. The forecast high of 103°F is 7°F above the 96°F typical for this month. The best window to be outside is roughly 7 AM to 10 AM, when temperature, rain chance and wind line up best. swimming is the strongest bet in Riverside County today at 10/10. No weather-related travel disruption is expected today. Roads and airports should run normally.
Compiled from this page's own data: atlas facts plus live Open-Meteo readings.
Quick facts about Riverside County
| Type | County |
|---|---|
| State | California |
| Country | United States |
| Continent | North America |
| Coordinates | 33°57′11.9″N 117°23′46″W (33.9533, -117.3961) |
| Population | 2.450.000 |
| Local time | 6:20 AM (UTC-07:00) |
| Best months | April, May, June, July, August, September and October |
| Climate | Mediterranean |
Weather map for Riverside County
Animated model layers. Pick a layer to load it.
Animated layers by Windy. For pin-level detail and nearby places, see the interactive map below.
Explore Riverside County
Every topic we hold for this place, and the same topic for the places around it.
Climate for related places
Frequently asked questions
Where is Riverside County?
Riverside County is a county in California. Its coordinates are 33.9533, -117.3961. It lies in North America.
What is the weather like in Riverside County right now?
It is currently 91°F (33°C) with clear. Humidity is 29% and wind is 6 mph.
When is the best time to visit Riverside County?
April, May, June, July, August, September and October offer the most comfortable conditions in Riverside County, which has a Mediterranean climate. January, February and December are usually the hardest months for outdoor plans.
What time zone is Riverside County in?
Riverside County observes America/Los_Angeles (UTC-07:00). The local time is 6:20 AM.
How many people live in Riverside County?
Riverside County has a population of approximately 2.5 million.
What is the nearest airport to Riverside County?
The closest airports are Los Angeles International Airport (LAX), 58 mi away, San Diego International Airport (SAN), 85 mi away and Harry Reid International Airport (LAS), 194 mi away.
What are the top things to do in Riverside County?
Popular options include Disneyland Resort, Hollywood Sign, Santa Monica State Beach, Anza-Borrego Desert State Park, Joshua Tree National Park and Coronado Beach.
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| Place data | USPOTUS Atlas dataset (us-counties) - coordinates, hierarchy and facts. |
|---|---|
| Forecast and observations | Open-Meteo (ECMWF and national models). |
| Air quality and pollen | Copernicus CAMS via Open-Meteo. US AQI scale. |
| Climate averages | ERA5 reanalysis via the Open-Meteo archive, aggregated over 3 years. |
| Official alerts | US National Weather Service. |
| Method | Scores, comparisons and advice on this page are computed from the inputs above. Distances are straight-line. Nothing is estimated where data is missing - the block is simply not shown. |
Last updated August 23, 2026 at 6:20 AM local time. Live blocks refresh every 15 minutes; climate averages monthly.
