Late summer · Weather & things to do
Sonoma in August
Little changes in Sonoma from July: highs stay near 91°F (33°C), lows near 58°F (15°C), and less than 0.1 in (3 mm) of rain falls.
Our comfort score puts it mid-table at 76/100, 8th of 12.
- Avg high
- 91°F (33°C)
- Avg low
- 58°F (15°C)
- Rain
- less than 0.1 in (3 mm)
- Humidity
- 49%
- Cloud cover
- 21%
- Daylight
- ~13 h 29 min
- Comfort score
- 76/100 · Great
What August feels like
Expect proper heat: afternoons average 91°F (33°C), so plan walking and hiking for the morning and save midday for shade, lunch or a swim.
There's a big swing between day and night, about 18°C (33°F), so mornings and evenings feel much cooler than the afternoon.
It's one of the drier stretches, with only less than 0.1 in (3 mm) of rain.
Clear skies are common, with cloud cover averaging only 21%.
Plan around August
August sits mid-table; the best months are April – June and October & November.
- Comfort holds steady from July (75 → 76/100).
- August sits inside the Apr – Oct window our California Wine Country route recommends.
What to pack for August
- Light, breathable clotheshighs average 91°F
- Sunscreen, sunglasses and a hathigh UV on clear days
- Refillable water bottleeasy to dehydrate in the heat
- A warm layer for eveningslows near 58°F
- Comfortable walking shoesmost picks involve some walking
What to do in Sonoma in August
Start early and take shelter at midday: the picks below pair morning outings with places to cool off.
Sonoma Plaza
California's largest town square, ringed by tasting rooms and shops.
Why now August scores 76/100 for comfort, good conditions for being outside.
Glen Ellen Star
Small wood-fired kitchen serving pizzas, roasted vegetables and local wines.
Why now A break from 91°F afternoons.
Buena Vista Winery
California's oldest commercial winery (1857), with historic stone cellars.
Why now Somewhere to sit out the hottest hours.
Jack London State Historic Park
Ranch trails, vineyard views and the ruins of Jack London's Wolf House.
Why now Highs near 91°F and 0.0 in of monthly rain make this an easy outdoor pick.
The Girl & the Fig
Wine-country French cooking just off the plaza, open since 1997.
Why now One to do outside while the weather is on your side.
Nearby in August
- Napa in August~18 mi · highs 88°F, 0.0 in rain · 2°C (3°F) cooler by day, about as wet
- Healdsburg in August~31 mi · highs 76°F, 0.0 in rain · 8°C (15°F) cooler by day, about as wet
- San Francisco in August~36 mi · highs 73°F, 0.0 in rain · 10°C (18°F) cooler by day, about as wet
- Old Sacramento Waterfront in August~55 mi · highs 96°F, 0.0 in rain · 3°C (5°F) warmer by day, about as wet
NASA POWER 2001–2025 monthly averages on a ~50 km grid, temperatures adjusted from the grid cell's ~266 m to Sonoma's ~26 m elevation (standard lapse rate). Comfort scores weigh temperature, rain, humidity and cloud: see how we score each month. Check a forecast before you go.
Sonoma in August: quick answers
Is August a good time to visit Sonoma?
It's middling, scoring 76/100. The best months are April – June and October & November, at up to 100. Expect highs of 91°F (33°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 Sonoma in August?
Average highs are 91°F (33°C) and average lows 58°F (15°C), making it the 2nd-warmest month by daytime highs.
Does it rain a lot in Sonoma 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 Sonoma in August?
Bring light, breathable clothes (highs average 91°F), sunscreen, sunglasses and a hat (high UV on clear days), refillable water bottle (easy to dehydrate in the heat), a warm layer for evenings (lows near 58°F) and comfortable walking shoes (most picks involve some walking).
Routes in season in August
- California Wine Country Apr – Oct
Planning Sonoma in August?
Share this August plan with your group, poll everyone on dates and keep the packing list in one place.