United States San Francisco Weather in August — Climate Guide
August in San Francisco is Moderate
August is Moderate for San Francisco.
August is still cool but fog starts thinning. **Outside Lands Music Festival** in Golden Gate Park (2nd weekend) draws 75,000+/day with major headliners — book 6+ months ahead for tickets + hotels. Late August + early September are when SF finally feels warm.
Travel score
San Francisco August Weather Stats
Avg High
20°C
Avg Low
14°C
Rainy Days
0
0mm total
Sunshine
9h
Daily avg
Humidity
78%
Slightly humid
UV Index
9
Very high
Wind
14 km/h
Gusts 32
Sea Temp
15°C
Avg water temp
Crowds
Very busy
At attractions
August Sunrise & Sunset
Air Quality
PM2.5
9 μg/m³
PM10
18 μg/m³
Status
Good
Feels-Like Temperature & Wind
Feels like
Daytime
20°C
Nighttime
14°C
Humidity and wind affect how the actual temperature feels.
Wind
14 km/h
Max gust 32 km/h
Activities Recommended for August
August Travel Pros & Cons
Pros
- Outside Lands festival
- Fog beginning to clear late month
Cons
- Hotel rates peak
August Events & Festivals
- Outside Lands Music Festival (2nd weekend, Golden Gate Park)
San Francisco in August — Full Picture
August is still cool but fog starts thinning. **Outside Lands Music Festival** in Golden Gate Park (2nd weekend) draws 75,000+/day with major headliners — book 6+ months ahead for tickets + hotels. Late August + early September are when SF finally feels warm.
What to Wear & What to Pack
Peak summer ending — high 20°C, low 14°C. Same layers as June/July. Fog starts to thin in late August.
Packing Checklist
Seasonal Weather Overview
Spring (Mar·Apr·May)
17.3°C
11°C
5.3/mo
Summer (Jun·Jul·Aug)
Current19.3°C
13.3°C
0.3/mo
Autumn (Sep·Oct·Nov)
20.3°C
12.7°C
3.7/mo
Winter (Dec·Jan·Feb)
14.3°C
8.3°C
10.3/mo
San Francisco Monthly Weather Comparison
| Month | High | Low | Rain | Sun | Humid | UV | Crowd | Price |
|---|---|---|---|---|---|---|---|---|
| 14° | 8° | 11d·110mm | 5h | 75% | 3 | Quiet | Low season | |
| 15° | 9° | 10d·110mm | 6h | 73% | 4 | Quiet | Low season | |
| 16° | 10° | 8d·75mm | 8h | 70% | 5 | Moderate | Shoulder | |
| 17° | 11° | 5d·35mm | 9h | 70% | 7 | Moderate | Shoulder | |
| May (Best) | 19° | 12° | 3d·18mm | 10h | 70% | 8 | Busy | Peak |
| 19° | 13° | 1d·5mm | 9h | 75% | 9 | Very busy | Peak | |
| 19° | 13° | 0d·0mm | 9h | 78% | 10 | Very busy | Peak | |
| 20° | 14° | 0d·0mm | 9h | 78% | 9 | Very busy | Peak | |
| 22° | 14° | 1d·8mm | 10h | 73% | 8 | Very busy | Peak | |
| 21° | 13° | 3d·28mm | 8h | 73% | 6 | Very busy | Peak | |
| 18° | 11° | 7d·70mm | 7h | 73% | 4 | Busy | Peak | |
| 14° | 8° | 10d·110mm | 5h | 75% | 3 | Very busy | Peak |
View Other Months
San Francisco August Hotel Picks
Frequently Asked Questions
Is August a good time to visit San Francisco?
San Francisco in August is Moderate. Tourist crowds are very busy and flight/hotel prices are peak.
What's the average temperature in San Francisco in August?
San Francisco August averages a high of 20°C and a low of 14°C.
Does it rain much in San Francisco in August?
San Francisco August averages 0mm of rainfall over about 0 rainy days.
What should I wear in San Francisco in August?
Peak summer ending — high 20°C, low 14°C. Same layers as June/July. Fog starts to thin in late August.
What time are sunrise and sunset in San Francisco in August?
San Francisco August sunrise is 06:25 and sunset is 20:10, with 13h 45m of daylight.
What's the air quality like in San Francisco in August?
San Francisco August air quality (AQI) averages 35, rated Good. PM2.5 averages 9μg/m³.
What activities are recommended in San Francisco in August?
In August, San Francisco is great for Golden Gate Bridge, Alcatraz, Outside Lands Music Festival.
Is August peak season in San Francisco?
San Francisco August crowds are very busy and prices are peak. Advance reservations are strongly recommended.
Best Months to Visit San Francisco
View Other Months
Why you can trust weather guide
Based in Chiang Mai for 8+ years, with 30+ countries visited across Southeast Asia, Japan, and Europe. Every detail in this guide is primary-source verified as of April 2026, with prices auto-refreshed via live exchange rate APIs. This isn't AI-generated boilerplate — it's written from the perspective of someone who has actually been there.