How to Use a Barometer for Fishing: Predict the Best Times to Catch Fish

Experienced anglers know that barometric pressure significantly affects fish behavior. Understanding how to read barometric pressure can help you predict when fish will be most active, dramatically improving your catch rates.

What is Barometric Pressure?

Barometric pressure (also called atmospheric pressure) is the weight of the air above us. It's measured in hectopascals (hPa) or millibars (mbar). Normal sea-level pressure is around 1013 hPa.

How Pressure Affects Fish

Fish have swim bladders—internal gas-filled organs that help them maintain buoyancy. When barometric pressure changes, it affects the gas in their swim bladders, which changes their comfort level and feeding behavior.

Best Barometric Pressure for Fishing

Falling Pressure (1000-1013 hPa → Dropping)

Excellent fishing conditions. Fish sense the pressure drop and feed aggressively before the weather changes. This is often the best time to fish.

Low Pressure (below 1000 hPa)

Good for certain species. Bass, catfish, and other predators become more active. Fish tend to move to shallower water.

Rising Pressure (1000 hPa → Rising)

Fair to good. Fish are recovering from low pressure. Focus on deeper water where fish seek stability.

High Pressure (above 1020 hPa)

Challenging conditions. Fish become lethargic and move to deeper water. Early morning and late evening are best times.

Stable Pressure (1010-1020 hPa)

Consistent fishing. Fish follow normal patterns. Good for learning new techniques.

Using Your Smartphone as a Barometer

Modern Android phones include barometric sensors. Our Thermometer app displays real-time barometric pressure, helping you track pressure changes throughout your fishing trip.

Practical Tips

• Check pressure before leaving home—plan your trip around falling pressure
• Monitor pressure during fishing—note how catch rates change
• Keep a fishing log with pressure readings to identify patterns
• Combine pressure data with temperature and humidity for best results

Conclusion

Barometric pressure is one of the most reliable indicators of fish activity. By monitoring pressure with your smartphone, you can time your fishing trips for maximum success.

Download our Thermometer app to get real-time barometric pressure readings on your next fishing trip.