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Santa Cruz's forum calls September one of the warmest and most reliable months — low-70s°F by day, chillier mornings and evenings in the 50s, with the coastal fog that plagues early summer mostly staying offshore. Regulars are consistent that it never gets tropical or humid here, just comfortably warm, making it a favorite pick over the foggier months of June and July.

Regulars name this as a favorite window specifically because it tends to run fog-free with a slim chance of rain, some years delivering what locals call an Indian summer with highs pushing into the 70s or even 80s Fahrenheit. Our row backs that mild, genuinely dry read, 24C reading as a hot 23C, over 10C nights, with rain minimal at 38mm across 2.3 days and humidity at 73 percent. Regulars are specific that many Boardwalk attractions cut back to weekend-only hours once the full April-through-Labor-Day season ends, worth checking before planning a visit around it. The sea sits at a cool 15.8C, bracing for most swimmers even on a warm day. The record: 9.7 hours of sun, a 17.3 kph wind and AQI 35.

Regulars describe a daily pattern rather than a single temperature for this month: a marine layer obscures the morning sun, generally burning off by noon into a clear afternoon, then sometimes rolling back in by evening - the coast acting as the meeting point between cold ocean and hot inland air. Our row backs the mild, dry read, 23C over 9.6C with rain essentially absent at 2.1mm across under a day, and one of the driest columns recorded in this project. The Boardwalk runs at full capacity through summer, with beach concerts a regular feature once school lets out. The sea stays properly cold, 14.4C, so swimming is a cold-water proposition whatever the air is doing above it. The record: humidity 77 percent, 13.1 hours of sun, a 20.8 kph wind and AQI 36.

Santa Cruz-forum threads on December weather confirm it sits inside the rainy season here, temperatures generally in the 40s to 50s Fahrenheit and days described as genuinely fickle, alternating between stretches of rain and stretches of sun sometimes within the same afternoon. Posters describe no reliable pattern to count on - a visit could land on clear, crisp days or a soggy one, with little way to predict which in advance. The ocean runs cold enough that swimming isn't really on the table, though the coastline and boardwalk are still worth a visit, since much of the appeal here is the scenery. Layering is the standing advice, since a sunny afternoon can still carry a genuine chill once the coastal fog picks up. The record: 17.4C days feeling like 16C, 6C nights, a notably high 176mm across 8.7 days, a 13.2C sea, 79 percent humidity and 7.1 hours of sun.

July and August are the foggiest months on this coast, Monterey Bay included, and regulars describe the day in three acts: fog and the 50s Fahrenheit in the morning, burn-off around noon or one into very blue sky and the low-to-mid 70s, then the sea breeze pulling it back in by late afternoon. Their explanation is the useful part - the marine layer is a response to heat in the Central Valley, a cold ocean against a hot continent with the coast as the battleground. Our row cannot see fog at all: 0.3mm of rain and 0.3 precipitation days under 79 percent humidity is what a fogged-in month looks like in a rain gauge. The sea is the other constant at 14.2C, too cold to enjoy swimming even on a sunny day. The record: 23.8C days, 10.4C nights, 12.9 hours of sun and AQI 33.