Napa Valley, CA
Today’s Forecast:
Today’s Report:
Biking
Use Caution for biking. High near 55°F. Rain forecast later today (100%). Breezy winds (18 mph).
- Temp: Marginal weather factor
- Rain: Marginal weather factor
- Wind: Marginal weather factor
- Thunderstorm: Favorable conditions
Golf
Use Caution for golf. High near 55°F. Rain forecast later today (100%). Breezy winds (18 mph).
- Temp: Marginal weather factor
- Rain: Marginal weather factor
- Wind: Marginal weather factor
- Thunderstorm: Favorable conditions
Outdoor Events / Activities
Use Caution for outdoor events / activities. High near 55°F. Rain forecast later today (100%). Breezy winds (18 mph).
- Temp: Marginal weather factor
- Rain: Marginal weather factor
- Wind: Marginal weather factor
- Thunderstorm: Favorable conditions
About Napa Valley
Napa Valley is an outdoor-planning page for Napa through Calistoga and adjacent hills. It has a distinct purpose centered on cycling, golf, events, valley heat, smoke, and hill-road planning, with the forecast used to choose the safest and most comfortable version of the day.
Make the Most of a Napa Valley Day
Start by comparing conditions across Napa, Yountville, and the rest of the coverage area. Choose among biking, golf, outdoor events based on wind, precipitation, temperature, visibility, water or trail conditions, road access, smoke, and available daylight.
Weather Tips for Napa Valley
- Conditions around Napa through Calistoga and adjacent hills can differ sharply from nearby towns; cycling, golf, events, valley heat, smoke, and hill-road planning are the main planning variables.
- For golf and exposed paths, compare heat, wind, lightning, shade, smoke, and ground conditions before choosing a tee time or longer route.
- Recent rain, heat, smoke, fire restrictions, water levels, and afternoon wind can change which route or activity is most comfortable.
- Air quality and wildfire smoke can shift quickly; shorten strenuous plans when visibility or breathing conditions worsen.
Nearby Towns and Areas
This page covers Napa through Calistoga and adjacent hills. It can also be useful when planning outdoor time near:
- Napa
- Yountville
- St. Helena
- Calistoga
- Silverado Trail
- Lake Hennessey
- Bothe-Napa Valley
Plan Around the Conditions
Use the forecast to choose the best version of Napa Valley rather than forcing one itinerary. A shorter route, earlier launch, sheltered shoreline, lower-elevation trail, or town-based backup can preserve the day when conditions change.
7-Day Forecast for Napa Valley
Napa Valley Weather by Season
Winter
At Napa Valley, winter is cooler and wetter, with fog, slick roads, muddy trails, and occasional river or creek rises after storms. Many low-elevation outings remain practical between rain systems.
Spring
Around Napa through Calistoga and adjacent hills, spring usually offers comfortable temperatures and green hills for biking, golf, hiking, and events. Watch for wet trail closures early in the season and rapidly warming afternoons later.
Summer
For cycling, golf, events, valley heat, smoke, and hill-road planning, summer is hot, dry, and strongly sun-exposed, so early starts and shade planning matter. Wildfire smoke, poor air quality, and water availability can be more limiting than clouds.
Fall
Near Napa and the surrounding area, early fall often stays hot and dry, with fire weather and smoke possible before cooler conditions arrive. Later fall brings better daytime comfort and the return of rain chances.
Key Climate Data Points
- Warmest months: July and August.
- Coolest months: December and January.
- Wettest season: December through March.
- Driest season: June through September.
- Best outdoor window: Spring and late fall for biking, golf, hiking, and outdoor events.