Weather in mid Jan could pretty cool. Its difficult to predict based on historical data, especially with the recent changes in weather patterns. This year was very dry as is often the case. I wouldn't worry too much about rain, but bring jackets or hoodies to make it comfortable early morning/evenings. Its probably not going to be shorts weather like you would get in Florida, but warm afternoons (like mid to upper 70's) are likely. Might be OK for swimming, might not.
But be aware that 2 park days is not enough to really see it. You would only hit the highlights. 3 days minimum. 4 to 5 if you want to really soak in everything.
But be aware that 2 park days is not enough to really see it. You would only hit the highlights. 3 days minimum. 4 to 5 if you want to really soak in everything.