Barometric Pressure in Porterville, United States 
1013 hPa
15.0 ℃
50%
3.0 m/s
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Forecast
Hourly Pressure Trends
Track the barometric pressure in Porterville hour by hour across the next 6 hourly readings.
Porterville sits on the eastern edge of California’s San Joaquin Valley, near the Sierra Nevada foothills. In summer, high pressure often dominates. Sinking air limits cloud growth and keeps skies clear, so hot, dry days can last for weeks.
The valley’s flat floor heats strongly, while the Sierra Nevada blocks some moist air moving inland. Pacific low-pressure storms bring most of the rain, mainly from late fall through early spring. Between storms, cool nights and calm air can trap fog or haze near the ground.
Winter and early spring are the wettest, though rainfall varies from year to year. Summers are usually very dry, with the strongest heat in July and August. Fall cools gradually, while winter days are mild and nights can be chilly, especially during still, foggy spells.