Seattle Barometric Pressure Today
Friday, September 11, 2026
Current Barometric Pressure
What Normal Pressure Means
- Weather: Typical weather patterns
- Health: Average conditions for most people
- Activities: Good for most activities
47.6062°N, 122.3321°W • Elevation: 175 ft
3-Day Barometric Pressure Forecast
Today's Pressure Trend
Understanding Barometric Pressure Levels
Current reading: 30.01 inHg - Normal Pressure
Barometric Pressure in Cities Near Seattle
Compare pressure readings in cities within 300km radius
Barometric Pressure in Seattle, WA - Complete Guide
The current barometric pressure in Seattle is 30.01 inches of mercury (inHg), equivalent to 1,016 millibars. This normal pressure reading was recorded at 4:06 PM UTC on September 11, 2026, providing you with real-time atmospheric conditions for Seattle.
What is Barometric Pressure?
Barometric pressure, also known as atmospheric pressure, is the weight of the air column above us. It's measured in inches of mercury (inHg) or millibars (mb). In Seattle, normal pressure typically ranges from 29.80 to 30.20 inHg (1,009 to 1,023 mb). Today's reading of 30.01 inHg indicates normal pressure conditions.
How Barometric Pressure Affects Seattle
🌤️ Weather Patterns
Normal pressure suggests typical weather patterns for Seattle with moderate conditions and no extreme weather expected.
🏥 Health Impacts
Barometric pressure changes can affect human health. Normal pressure conditions typically have minimal impact on health and well-being. People with migraines, arthritis, or other weather-sensitive conditions often notice these changes.
🎣 Outdoor Activities
Barometric pressure influences fish behavior and outdoor conditions. Normal pressure provides excellent fishing conditions as fish are typically active.
Historical Context for Seattle
Seattle experiences seasonal pressure variations throughout the year. Winter months typically see more dramatic pressure changes due to storm systems moving through the region. Summer patterns tend to be more stable with less extreme pressure variations. The city's location at 47.6062°N latitude influences these seasonal patterns.
Elevation and Atmospheric Pressure
At Seattle's elevation of 175 feet above sea level, atmospheric pressure is slightly different than at sea level. For every 1,000 feet of elevation, atmospheric pressure decreases by approximately 1 inHg. All readings displayed are adjusted for local elevation to provide accurate, location-specific data.
Barometric Pressure Measurement
Barometric pressure is measured using a barometer, which can be either mercury-based or digital. The standard measurement is in inches of mercury (inHg), though millibars (mb) are also common. Standard sea level pressure is 29.92 inHg or 1,013.25 mb. Our data for Seattle comes from professional weather stations and is updated every 15 minutes for accuracy.
Planning Your Day in Seattle
With today's pressure reading of 30.01 inHg, Seattle residents can expect typical weather patterns. This makes it good for most activities. For those sensitive to pressure changes, today's conditions suggest average conditions for most people.
Frequently Asked Questions
What is normal barometric pressure in Seattle?
Normal barometric pressure in Seattle typically ranges between 29.80 and 30.20 inHg (1,009 to 1,023 mb). Current conditions show normal pressure at 30.01 inHg, which is within the normal range.
How often is the pressure data updated?
Barometric pressure data for Seattle updates every 15 minutes from professional weather stations. This ensures you always have the most current atmospheric readings for planning your activities and understanding current conditions.
How does pressure affect the weather in Seattle?
Barometric pressure is a key indicator of weather changes. Normal pressure (29.80-30.20 inHg) suggests typical weather patterns for Seattle with moderate conditions.
Why does barometric pressure change?
Barometric pressure changes due to the movement of air masses, weather systems, and temperature variations. High pressure systems bring sinking air and clear weather, while low pressure systems involve rising air and often bring clouds and precipitation. These systems constantly move across Seattle, causing pressure fluctuations.
Can barometric pressure affect my health?
Yes, many people are sensitive to barometric pressure changes. Common effects include headaches, joint pain, sinus pressure, and changes in mood. Those with arthritis, migraines, or other chronic conditions may notice symptoms worsen with rapid pressure changes. Today's stable pressure conditions are less likely to trigger these symptoms.
What's the difference between inHg and millibars?
Both measure atmospheric pressure but use different scales. Inches of mercury (inHg) is commonly used in the United States, while millibars (mb) are used internationally. Today's Seattle reading of 30.01 inHg equals 1,016 mb. Standard sea level pressure is 29.92 inHg or 1,013.25 mb.