| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 20.2° | 8.5° | 112mm | 7.2 | 86 |
| February | 20.9° | 8.6° | 129.9mm | 7.6 | 85 |
| March | 22.8° | 9.8° | 70.2mm | 6.2 | 88 |
| April | 24.7° | 11.2° | 29.2mm | 3.5 | 93 |
| May | 25.8° | 13.2° | 14.1mm | 2.8 | 94 |
| June | 29° | 15.4° | 5mm | 1.8 | 88 |
| July | 32.4° | 17.8° | 0.9mm | 0.5 | 77 |
| August | 33.3° | 18.3° | 4.5mm | 0.4 | 74 |
| September | 32.3° | 17.7° | 5.7mm | 1 | 77 |
| October | 28.6° | 14.4° | 19mm | 2.6 | 88 |
| November | 23.9° | 10.7° | 29.1mm | 3.3 | 93 |
| December | 19.7° | 8.1° | 85.7mm | 6.2 | 87 |
January in Pasadena averages a daily high of 20.2°C with nights around 8.5°C. Expect roughly 7.2 wet days totalling 112mm. Comfortable conditions for being outdoors all day.
February in Pasadena averages a daily high of 20.9°C with nights around 8.6°C. Expect roughly 7.6 wet days totalling 129.9mm. Comfortable conditions for being outdoors all day.
March in Pasadena averages a daily high of 22.8°C with nights around 9.8°C. Expect roughly 6.2 wet days totalling 70.2mm. Comfortable conditions for being outdoors all day.
April in Pasadena averages a daily high of 24.7°C with nights around 11.2°C. Expect roughly 3.5 wet days totalling 29.2mm. Comfortable conditions for being outdoors all day.
May in Pasadena averages a daily high of 25.8°C with nights around 13.2°C. Rain is rare — about 2.8 wet days and 14.1mm across the month. Comfortable conditions for being outdoors all day.
June in Pasadena averages a daily high of 29°C with nights around 15.4°C. Rain is rare — about 1.8 wet days and 5mm across the month. Comfortable conditions for being outdoors all day.
July in Pasadena averages a daily high of 32.4°C with nights around 17.8°C. Rain is rare — about 0.5 wet days and 0.9mm across the month. Comfortable conditions for being outdoors all day.
August in Pasadena averages a daily high of 33.3°C with nights around 18.3°C. Rain is rare — about 0.4 wet days and 4.5mm across the month. Generally workable, with some weather to plan around.
September in Pasadena averages a daily high of 32.3°C with nights around 17.7°C. Rain is rare — about 1 wet days and 5.7mm across the month. Comfortable conditions for being outdoors all day.
October in Pasadena averages a daily high of 28.6°C with nights around 14.4°C. Rain is rare — about 2.6 wet days and 19mm across the month. Comfortable conditions for being outdoors all day.
November in Pasadena averages a daily high of 23.9°C with nights around 10.7°C. Expect roughly 3.3 wet days totalling 29.1mm. Comfortable conditions for being outdoors all day.
December in Pasadena averages a daily high of 19.7°C with nights around 8.1°C. Expect roughly 6.2 wet days totalling 85.7mm. 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. Pasadena peaks at 94.
Based on 30 years of records, March–June scores highest for comfort in Pasadena, balancing daytime temperature against rainfall.
August is the warmest, averaging a daily high of 33.3°C.
February is the wettest, averaging 129.9mm of rain across roughly 7.6 wet days.
December is the coolest month, with average daily highs around 19.7°C.