| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 19.7° | 5.9° | — | — | 93 |
| February | 19.5° | 5.7° | — | — | 92 |
| March | 21.4° | 7° | — | — | 94 |
| April | 23.3° | 8.5° | — | — | 94 |
| May | 25.6° | 10.9° | — | — | 94 |
| June | 30° | 13.7° | — | — | 82 |
| July | 33.7° | 17° | — | — | 67 |
| August | 34.1° | 17.2° | — | — | 66 |
| September | 32.4° | 15.8° | — | — | 72 |
| October | 27.5° | 12.3° | — | — | 92 |
| November | 23.3° | 8.4° | — | — | 94 |
| December | 19.2° | 5.7° | — | — | 91 |
January in Perris averages a daily high of 19.7°C with nights around 5.9°C. Comfortable conditions for being outdoors all day.
February in Perris averages a daily high of 19.5°C with nights around 5.7°C. Comfortable conditions for being outdoors all day.
March in Perris averages a daily high of 21.4°C with nights around 7°C. Comfortable conditions for being outdoors all day.
April in Perris averages a daily high of 23.3°C with nights around 8.5°C. Comfortable conditions for being outdoors all day.
May in Perris averages a daily high of 25.6°C with nights around 10.9°C. Comfortable conditions for being outdoors all day.
June in Perris averages a daily high of 30°C with nights around 13.7°C. Comfortable conditions for being outdoors all day.
July in Perris averages a daily high of 33.7°C with nights around 17°C. Generally workable, with some weather to plan around.
August in Perris averages a daily high of 34.1°C with nights around 17.2°C. Generally workable, with some weather to plan around.
September in Perris averages a daily high of 32.4°C with nights around 15.8°C. Generally workable, with some weather to plan around.
October in Perris averages a daily high of 27.5°C with nights around 12.3°C. Comfortable conditions for being outdoors all day.
November in Perris averages a daily high of 23.3°C with nights around 8.4°C. Comfortable conditions for being outdoors all day.
December in Perris averages a daily high of 19.2°C with nights around 5.7°C. Comfortable conditions for being outdoors all day.
Each month scores out of 100. It starts at 100 and loses points for daytime highs outside a 20–27°C band, for wet days, and for nights below 2°C. Nothing else is weighted in — no crowd data, no prices, no opinion. Perris peaks at 94.
Based on 30 years of records, October–May scores highest for comfort in Perris, balancing daytime temperature against rainfall.
August is the warmest, averaging a daily high of 34.1°C.
January is the wettest, averaging —mm of rain across roughly — wet days.
December is the coolest month, with average daily highs around 19.2°C.