Late summer · Weather & things to do
Napa in August
Little changes in Napa from July: highs stay near 88°F (31°C), lows near 55°F (13°C), and less than 0.1 in (3 mm) of rain falls.
It scores 83/100 for comfort, 7th of 12, which makes it a solid shoulder-season month.
- Avg high
- 88°F (31°C)
- Avg low
- 55°F (13°C)
- Rain
- less than 0.1 in (3 mm)
- Humidity
- 49%
- Cloud cover
- 21%
- Daylight
- ~13 h 30 min
- Comfort score
- 83/100 · Great
What August feels like
Heat sets the pace, with highs around 88°F (31°C). Get out early and keep the hottest hours for somewhere cool.
There's a big swing between day and night, about 18°C (33°F), so mornings and evenings feel much cooler than the afternoon.
Rain is scarce: less than 0.1 in (3 mm) for the whole month.
Clear skies are common, with cloud cover averaging only 21%.
Plan around August
August is shoulder season: good weather, a step below the best months (April – June and September – November).
- Comfort holds steady from July (82 → 83/100).
- August sits inside the Apr – Oct window our California Wine Country route recommends.
What to pack for August
- Light, breathable clothes88°F afternoons
- Sunscreen, sunglasses and a hatstrong sun this month
- Refillable water bottleeasy to dehydrate in the heat
- A warm layer for eveningsnights drop to 55°F
- Comfortable walking shoesmost picks involve some walking
What to do in Napa in August
Start early and take shelter at midday: the picks below pair morning outings with places to cool off.
Domaine Carneros
Chateau-style sparkling wine house with a terrace over the vineyards.
Why now August scores 83/100 for comfort, good conditions for being outside.
Silverado Trail
Quieter road along the valley's east side, lined with wineries.
Why now Highs near 88°F and 0.0 in of monthly rain make this an easy outdoor pick.
Gott's Roadside
Open-air burger stand with ahi burgers, garlic fries and shakes.
Why now A break from 88°F afternoons.
Oxbow Public Market
Indoor market with oysters, tacos, cheese and coffee by the Napa River.
Why now Somewhere to sit out the hottest hours.
Stag's Leap Wine Cellars
Home of the Cabernet that won the 1976 Judgment of Paris.
Nearby in August
- Sonoma in August~18 mi · highs 91°F, 0.0 in rain · 2°C (3°F) warmer by day, about as wet
- Healdsburg in August~33 mi · highs 76°F, 0.0 in rain · 7°C (12°F) cooler by day, about as wet
- Old Sacramento Waterfront in August~42 mi · highs 96°F, 0.0 in rain · 4°C (8°F) warmer by day, about as wet
- San Francisco in August~51 mi · highs 73°F, 0.0 in rain · 8°C (15°F) cooler by day, about as wet
NASA POWER 2001–2025 monthly averages on a ~50 km grid. Comfort scores weigh temperature, rain, humidity and cloud: see how we score each month. Check a forecast before you go.
Napa in August: quick answers
Is August a good time to visit Napa?
It's a good shoulder-season choice, scoring 83/100 against a best of 100 in April – June and September – November. Expect highs of 88°F (31°C) and less than 0.1 in (3 mm) of rain. August is inside the Apr – Oct window our California Wine Country route recommends.
How hot is Napa in August?
Average highs are 88°F (31°C) and average lows 55°F (13°C), making it the 2nd-warmest month by daytime highs.
Does it rain a lot in Napa in August?
Not much: less than 0.1 in (3 mm) of rain falls across August on average, the driest month of the year. The annual total is about 27.1 in (689 mm).
What should I pack for Napa in August?
Bring light, breathable clothes (88°F afternoons), sunscreen, sunglasses and a hat (strong sun this month), refillable water bottle (easy to dehydrate in the heat), a warm layer for evenings (nights drop to 55°F) and comfortable walking shoes (most picks involve some walking).
Routes in season in August
- California Wine Country Apr – Oct
Planning Napa in August?
Bring the crew into one shared trip: vote on dates, build the day-by-day plan, split costs and share one packing list.