July is the middle of the run. The swell is solid, with occasional glassy windows across both the central and southern Pacific, and here is the useful detail: this is the month the whole coast works rather than one region, so Santa Teresa, Dominical and Pavones are all in play alongside Guanacaste.
July usually brings a short dry spell, the veranillo, a week or two of reduced rain in the middle of the green season. It does not change the swell and it does change the trip: clearer afternoons and roads that are easier on the Nicoya. The water is at 29°C throughout.

