| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 17.2° | 6.9° | — | — | 85 |
| February | 17° | 6.2° | — | — | 84 |
| March | 19.1° | 7.1° | — | — | 91 |
| April | 21.7° | 8.1° | — | — | 94 |
| May | 24.9° | 10.2° | — | — | 94 |
| June | 30.4° | 13.5° | — | — | 80 |
| July | 34.4° | 17.5° | — | — | 64 |
| August | 34.6° | 18.1° | — | — | 64 |
| September | 31.7° | 16.8° | — | — | 75 |
| October | 26.3° | 13.3° | — | — | 94 |
| November | 21.1° | 9.6° | — | — | 94 |
| December | 16.9° | 6.7° | — | — | 84 |
January in Yucaipa averages a daily high of 17.2°C with nights around 6.9°C. Comfortable conditions for being outdoors all day.
February in Yucaipa averages a daily high of 17°C with nights around 6.2°C. Comfortable conditions for being outdoors all day.
March in Yucaipa averages a daily high of 19.1°C with nights around 7.1°C. Comfortable conditions for being outdoors all day.
April in Yucaipa averages a daily high of 21.7°C with nights around 8.1°C. Comfortable conditions for being outdoors all day.
May in Yucaipa averages a daily high of 24.9°C with nights around 10.2°C. Comfortable conditions for being outdoors all day.
June in Yucaipa averages a daily high of 30.4°C with nights around 13.5°C. Comfortable conditions for being outdoors all day.
July in Yucaipa averages a daily high of 34.4°C with nights around 17.5°C. Generally workable, with some weather to plan around.
August in Yucaipa averages a daily high of 34.6°C with nights around 18.1°C. Generally workable, with some weather to plan around.
September in Yucaipa averages a daily high of 31.7°C with nights around 16.8°C. Comfortable conditions for being outdoors all day.
October in Yucaipa averages a daily high of 26.3°C with nights around 13.3°C. Comfortable conditions for being outdoors all day.
November in Yucaipa averages a daily high of 21.1°C with nights around 9.6°C. Comfortable conditions for being outdoors all day.
December in Yucaipa averages a daily high of 16.9°C with nights around 6.7°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. Yucaipa peaks at 94.
Based on 30 years of records, March–May scores highest for comfort in Yucaipa, balancing daytime temperature against rainfall.
August is the warmest, averaging a daily high of 34.6°C.
January is the wettest, averaging —mm of rain across roughly — wet days.
December is the coolest month, with average daily highs around 16.9°C.