| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 19.9° | 7.4° | 71.2mm | 7.2 | 85 |
| February | 19.7° | 7.6° | 67.5mm | 7.5 | 84 |
| March | 20.4° | 8.8° | 48.4mm | 6.4 | 87 |
| April | 21.7° | 9.9° | 24.1mm | 4.2 | 92 |
| May | 22.5° | 12.9° | 8.5mm | 3.4 | 93 |
| June | 24.4° | 14.8° | 2.1mm | 1.3 | 97 |
| July | 27.3° | 16.8° | 3mm | 0.7 | 97 |
| August | 28.2° | 17.3° | 2.4mm | 0.5 | 94 |
| September | 28° | 16.7° | 4mm | 1.1 | 94 |
| October | 25.6° | 13.4° | 17.6mm | 2.3 | 95 |
| November | 22.9° | 9.8° | 29.1mm | 4 | 92 |
| December | 19.7° | 7.2° | 49.9mm | 5.9 | 87 |
January in Vista averages a daily high of 19.9°C with nights around 7.4°C. Expect roughly 7.2 wet days totalling 71.2mm. Comfortable conditions for being outdoors all day.
February in Vista averages a daily high of 19.7°C with nights around 7.6°C. Expect roughly 7.5 wet days totalling 67.5mm. Comfortable conditions for being outdoors all day.
March in Vista averages a daily high of 20.4°C with nights around 8.8°C. Expect roughly 6.4 wet days totalling 48.4mm. Comfortable conditions for being outdoors all day.
April in Vista averages a daily high of 21.7°C with nights around 9.9°C. Expect roughly 4.2 wet days totalling 24.1mm. Comfortable conditions for being outdoors all day.
May in Vista averages a daily high of 22.5°C with nights around 12.9°C. Expect roughly 3.4 wet days totalling 8.5mm. Comfortable conditions for being outdoors all day.
June in Vista averages a daily high of 24.4°C with nights around 14.8°C. Rain is rare — about 1.3 wet days and 2.1mm across the month. Comfortable conditions for being outdoors all day.
July in Vista averages a daily high of 27.3°C with nights around 16.8°C. Rain is rare — about 0.7 wet days and 3mm across the month. Comfortable conditions for being outdoors all day.
August in Vista averages a daily high of 28.2°C with nights around 17.3°C. Rain is rare — about 0.5 wet days and 2.4mm across the month. Comfortable conditions for being outdoors all day.
September in Vista averages a daily high of 28°C with nights around 16.7°C. Rain is rare — about 1.1 wet days and 4mm across the month. Comfortable conditions for being outdoors all day.
October in Vista averages a daily high of 25.6°C with nights around 13.4°C. Rain is rare — about 2.3 wet days and 17.6mm across the month. Comfortable conditions for being outdoors all day.
November in Vista averages a daily high of 22.9°C with nights around 9.8°C. Expect roughly 4 wet days totalling 29.1mm. Comfortable conditions for being outdoors all day.
December in Vista averages a daily high of 19.7°C with nights around 7.2°C. Expect roughly 5.9 wet days totalling 49.9mm. 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. Vista peaks at 97.
Based on 30 years of records, April–November scores highest for comfort in Vista, balancing daytime temperature against rainfall.
August is the warmest, averaging a daily high of 28.2°C.
January is the wettest, averaging 71.2mm of rain across roughly 7.2 wet days.
February is the coolest month, with average daily highs around 19.7°C.