| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 20.3° | 10.7° | — | — | 94 |
| February | 20° | 9.8° | — | — | 94 |
| March | 21.3° | 10° | — | — | 94 |
| April | 22.9° | 10.7° | — | — | 94 |
| May | 24.9° | 12.1° | — | — | 94 |
| June | 27.7° | 13.9° | — | — | 91 |
| July | 31.2° | 16° | — | — | 77 |
| August | 31.8° | 16.7° | — | — | 75 |
| September | 30.8° | 16.7° | — | — | 79 |
| October | 27.4° | 15.1° | — | — | 92 |
| November | 23.6° | 12.6° | — | — | 94 |
| December | 19.7° | 10.3° | — | — | 93 |
January in Downey averages a daily high of 20.3°C with nights around 10.7°C. Comfortable conditions for being outdoors all day.
February in Downey averages a daily high of 20°C with nights around 9.8°C. Comfortable conditions for being outdoors all day.
March in Downey averages a daily high of 21.3°C with nights around 10°C. Comfortable conditions for being outdoors all day.
April in Downey averages a daily high of 22.9°C with nights around 10.7°C. Comfortable conditions for being outdoors all day.
May in Downey averages a daily high of 24.9°C with nights around 12.1°C. Comfortable conditions for being outdoors all day.
June in Downey averages a daily high of 27.7°C with nights around 13.9°C. Comfortable conditions for being outdoors all day.
July in Downey averages a daily high of 31.2°C with nights around 16°C. Comfortable conditions for being outdoors all day.
August in Downey averages a daily high of 31.8°C with nights around 16.7°C. Comfortable conditions for being outdoors all day.
September in Downey averages a daily high of 30.8°C with nights around 16.7°C. Comfortable conditions for being outdoors all day.
October in Downey averages a daily high of 27.4°C with nights around 15.1°C. Comfortable conditions for being outdoors all day.
November in Downey averages a daily high of 23.6°C with nights around 12.6°C. Comfortable conditions for being outdoors all day.
December in Downey averages a daily high of 19.7°C with nights around 10.3°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. Downey peaks at 94.
Based on 30 years of records, October–June scores highest for comfort in Downey, balancing daytime temperature against rainfall.
August is the warmest, averaging a daily high of 31.8°C.
January is the wettest, averaging —mm of rain across roughly — wet days.
December is the coolest month, with average daily highs around 19.7°C.