| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 39°F | 69°F | 53°F | 4.6" |
| February | 40°F | 68°F | 54°F | 3.4" |
| March | 44°F | 70°F | 56°F | 1.6" |
| April | 46°F | 72°F | 59°F | 1.3" |
| May | 53°F | 73°F | 62°F | 0.8" |
| June | 57°F | 76°F | 66°F | 0.1" |
| July | 60°F | 80°F | 69°F | 0.2" |
| August | 60°F | 81°F | 69°F | 0.1" |
| September | 57°F | 82°F | 69°F | 0.3" |
| October | 50°F | 79°F | 64°F | 1.2" |
| November | 43°F | 75°F | 57°F | 1.6" |
| December | 38°F | 68°F | 52°F | 3.8" |
| Index | Temecula | California | National |
| Air quality index | 89 | 55 | 42 |
| Pollution index | 22,790,900 | 10,473,190 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 42 |
| Days with moderate air quality | 178 |
| Days w/ poor A.Q. for sensitive groups | 79 |
| Days with unhealthy air quality | 58 |
| Pollutant | Total |
| Arsenic | 0.060% |
| Benzene | 0.190% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.220% |
| Mercury | 0.230% |
| City | Population | Air Quality Index | National Avg. |
| Pala, CA | 1,094 | 64 | 28.0% |
| Bonsall, CA | 4,194 | 64 | 28.0% |
| Camp Pendleton North, CA | 7,885 | 64 | 28.0% |
| Fallbrook, CA | 32,359 | 64 | 28.0% |
| Lake Elsinore, CA | 64,201 | 89 | 78.0% |
| Temecula, CA | 113,117 | 89 | 78.0% |
| City | Population | Air Quality Index | National Avg. |
| Costa Mesa, CA | 112,958 | 89 | 78.0% |
| Delta, BC | 112,691 | n/a | |
| Clovis, CA | 112,663 | 60 | 20.0% |
| Peoria, IL | 112,644 | 41 | 18.0% |
| Spring Hill, FL | 113,742 | 30 | 40.0% |
| Temecula, CA | 113,117 | 89 | 78.0% |
Here are the best places to live in California
Check out the 10 most dangerous cities in California
Check out the 10 safest cities in California
See the best places to live in Temecula