| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 36°F | 68°F | 51°F | 2.8" |
| February | 37°F | 68°F | 51°F | 2.8" |
| March | 39°F | 71°F | 54°F | 1.5" |
| April | 42°F | 73°F | 57°F | 0.9" |
| May | 48°F | 77°F | 61°F | 0.5" |
| June | 51°F | 85°F | 67°F | 0.0" |
| July | 57°F | 90°F | 72°F | 0.3" |
| August | 57°F | 91°F | 73°F | 0.1" |
| September | 55°F | 90°F | 71°F | 0.2" |
| October | 48°F | 82°F | 63°F | 0.7" |
| November | 41°F | 75°F | 57°F | 1.1" |
| December | 36°F | 66°F | 50°F | 3.2" |
| Index | Poway | California | National |
| Air quality index | 61 | 55 | 50 |
| Pollution index | 162,740 | 18,106,726 | 5,066,862 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 69 |
| Days with moderate air quality | 277 |
| Days w/ poor A.Q. for sensitive groups | 17 |
| Days with unhealthy air quality | 1 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.003% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City, State | Population | Air Quality Index | National Avg. |
| El Cajon, CA | 102,894 | 61 | 22% |
| Fairbanks Ranch, CA | 2,864 | 61 | 22% |
| Lakeside, CA | 21,488 | 61 | 22% |
| San Marcos, CA | 91,479 | 61 | 22% |
| Winter Gardens, CA | 21,255 | 61 | 22% |
| Poway, CA | 49,675 | 61 | 22% |
| City, State | Population | Air Quality Index | National Avg. |
| Ashburn, VA | 49,692 | 49 | 2% |
| Olympia, WA | 49,608 | 31 | 38% |
| Wheaton, MD | 49,764 | 49 | 2% |
| Wilson, NC | 49,558 | 34 | 32% |
| Downers Grove, IL | 49,555 | 60 | 20% |
| Poway, CA | 49,675 | 61 | 22% |