May 16, 2025 – Dry, warm, and breezy weather persists today, before a weather system arrives over the weekend. A slight chance of mountain/foothills thunderstorms north of Interstate 80 Saturday, is then followed by gusty and drying north winds Sunday and Monday.
As a result, critical fire weather conditions are anticipated Sunday and Monday throughout the Valley and Delta due to the gusty winds and expected low relative humidity.
Dry and hot weather then looks to follow, with areas of Moderate HeatRisk and elevated fire weather conditions through mid next week.
Fire Weather Watch in effect from 8 am PDT Sunday through 8 pm PDT Monday for Valley and Delta locations below 1000 feet.
Saturday: Weather system begins to drop southward from Pacific NW. 10-25% probability of isolated thunderstorms across northeast foothills and Sierra/southern Cascades from Interstate 80 northward. Temperatures cooling to near normal, with breezy winds throughout the day.
Sunday – Monday: Current ensemble trends indicate the expected weather system following an inside slider trajectory through the region. Gusty north to east winds expected to develop Sunday and Monday as this system progresses, with lingering breezy winds into Tuesday.
Probability of gusts 40 mph or higher:
Sunday: 30-50%, highest along and west of I-5 in the Sacramento Valley.
Monday: 20-40% across the central/southern Sacramento Valley and Delta.
Critical fire weather conditions expected Sunday and Monday, due to the combination of gusty northerly winds and low relative humidity in the Valley and Delta.
Tuesday – Thursday: Warming trend expected early to mid next week, with areas of Moderate HeatRisk across the Valley. North to east winds expected to remain diurnally breezy while very dry conditions prevail. Elevated fire weather conditions anticipated.