Glad to see that your pond is right in the healthy range!
You also need to write down the "time of day" if you start keeping records on your pond pH.
pH varies during the day due to the photosynthesis cycle. It is generally lowest (most acidic) first thing in the morning. It then goes up during the day as your photosynthesizing organisms start taking up the dissolved CO2 in the pond water.
P.S. I hope I didn't sent you too much rain. We recently got another massive rainstorm and our creek flooded over the bridge on the county road for the second time this spring. The poor beaver has been working his a$$ off, but keeps seeing his construction projects getting completely blown up!