Monthly weather forecast and climate
Santa Cruz, CA

Warmest months (with the highest average high temperature) are August and September (73°F).
The month with the lowest average high temperature is December (57.2°F).

The month with the highest average low temperature is September (55.2°F).
The coldest month (with the lowest average low temperature) is February (45.5°F).

The month with the highest relative humidity is March (75%).
The month with the lowest relative humidity is October (68%).

The wettest month (with the highest rainfall) is December (2.8").
Driest months (with the lowest rainfall) are July and August (0.04").

The month with the highest number of rainy days is March (13.4 days).
The month with the lowest number of rainy days is August (1.2 days).

The best month for swimming (with the highest average sea temperature) is September (58.2°F).
The coldest month (with the lowest average sea temperature) is April (53.9°F).

The month with the longest days is June (Average daylight: 14.7h).
The month with shortest days is December (Average daylight: 9.7h).

The month with most sunshine is July (Average sunshine: 11.7h).
The month with least sunshine is December (Average sunshine: 5.8h).

Months with the highest UV index are June, July, August and September (UV index 5).
Months with the lowest UV index are February and November (UV index 3).