| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 16.9° | 4.9° | 121.4mm | 10.9 | 68 |
| February | 17.5° | 5.4° | 104.9mm | 10 | 72 |
| March | 18.4° | 6.4° | 83.3mm | 10 | 75 |
| April | 19.5° | 7.5° | 43.1mm | 6.4 | 86 |
| May | 20.5° | 9.6° | 13.7mm | 3.3 | 93 |
| June | 21.8° | 11.4° | 2.2mm | 1.2 | 98 |
| July | 21.8° | 12.7° | 0.4mm | 0.8 | 98 |
| August | 22.4° | 13° | 0.7mm | 0.9 | 98 |
| September | 23.6° | 11.9° | 2.7mm | 0.9 | 98 |
| October | 23.2° | 9.5° | 25.3mm | 3.3 | 93 |
| November | 20° | 6.6° | 57.8mm | 6.9 | 86 |
| December | 16.7° | 4.7° | 128.5mm | 11.1 | 67 |
January in Watsonville averages a daily high of 16.9°C with nights around 4.9°C. Expect roughly 10.9 wet days totalling 121.4mm. Generally workable, with some weather to plan around.
February in Watsonville averages a daily high of 17.5°C with nights around 5.4°C. Expect roughly 10 wet days totalling 104.9mm. Generally workable, with some weather to plan around.
March in Watsonville averages a daily high of 18.4°C with nights around 6.4°C. Expect roughly 10 wet days totalling 83.3mm. Comfortable conditions for being outdoors all day.
April in Watsonville averages a daily high of 19.5°C with nights around 7.5°C. Expect roughly 6.4 wet days totalling 43.1mm. Comfortable conditions for being outdoors all day.
May in Watsonville averages a daily high of 20.5°C with nights around 9.6°C. Expect roughly 3.3 wet days totalling 13.7mm. Comfortable conditions for being outdoors all day.
June in Watsonville averages a daily high of 21.8°C with nights around 11.4°C. Rain is rare — about 1.2 wet days and 2.2mm across the month. Comfortable conditions for being outdoors all day.
July in Watsonville averages a daily high of 21.8°C with nights around 12.7°C. Rain is rare — about 0.8 wet days and 0.4mm across the month. Comfortable conditions for being outdoors all day.
August in Watsonville averages a daily high of 22.4°C with nights around 13°C. Rain is rare — about 0.9 wet days and 0.7mm across the month. Comfortable conditions for being outdoors all day.
September in Watsonville averages a daily high of 23.6°C with nights around 11.9°C. Rain is rare — about 0.9 wet days and 2.7mm across the month. Comfortable conditions for being outdoors all day.
October in Watsonville averages a daily high of 23.2°C with nights around 9.5°C. Expect roughly 3.3 wet days totalling 25.3mm. Comfortable conditions for being outdoors all day.
November in Watsonville averages a daily high of 20°C with nights around 6.6°C. Expect roughly 6.9 wet days totalling 57.8mm. Comfortable conditions for being outdoors all day.
December in Watsonville averages a daily high of 16.7°C with nights around 4.7°C. Expect roughly 11.1 wet days totalling 128.5mm. Generally workable, with some weather to plan around.
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. Watsonville peaks at 98.
Based on 30 years of records, May–October scores highest for comfort in Watsonville, balancing daytime temperature against rainfall.
September is the warmest, averaging a daily high of 23.6°C.
December is the wettest, averaging 128.5mm of rain across roughly 11.1 wet days.
December is the coolest month, with average daily highs around 16.7°C.