I was looking at the forecast and it seems like a pretty big range:
That's because you are looking at the Monterey Bay forecast. DON'T. The Monterey
Bay forecast always has a big range because there's always someplace that's
sheltered. Usually it's up around Santa Cruz. Instead, look at the offshore forecast
(Pigeon Pt. to Pt. Pinos out 20 nm) to see what Neptune is throwing at you. Here's
that forecast:
SAT
W WINDS 10 TO 20 KT...BECOMING S IN THE AFTERNOON.
WIND WAVES 2 TO 4 FT. NW SWELL 12 TO 15 AT 15 SECONDS...
DECREASING TO 8 TO 12 FT AT 14 SECONDS. A CHANCE OF RAIN.
SAT NIGHT
SW WINDS 15 TO 25 KT. WIND WAVES 3 TO 5 FT.
NW SWELL 7 TO 11 FT AT 13 SECONDS. RAIN.
SUN
NW WINDS 20 TO 30 KT. WIND WAVES 4 TO 7 FT.
NW SWELL 9 TO 13 FT. SHOWERS LIKELY.
If that holds, I'll stay home I've found (through experience) that when it's a NW swell
and it's bigger than 8 FT, it's not fun.
The forecasts aren't about getting every maybe possible dive day, but rather about
not diving any of the bad days.