High pressure systems cause the barometer to rise above a reading of 30.10, which causes fish to react in a negative manner. These systems often bring high, bright skies that put fish down as well.
Low pressure systems are usually associated with severe to moderately severe weather systems. Barometer readings under 29.50 are a good indicator to stay off the water until the fish adjust to the pressure change.
Fish tend to bite the best during stable weather periods when barometer readings are from 29.90 to 30.05. At this point, fish are most comfortable and actively feeding.
Watch for a rising barometer as a great indicator of fish activity. When low pressure systems linger for a few days, an incoming high pressure system can be just the ticket to get fish biting again.
Craft a Plan
If you have a fishing trip planned but the barometer is not in your favor, be sure to slow your presentation. The fish are still there; they just need a little more coaxing to bite.