What is the driest month to visit San Francisco?

June sees the least rainfall on average, based on real historical weather data.

What is the cheapest month to fly to San Francisco?

September currently shows the lowest real fare on file from London, at €382.

Does the cheapest month to fly line up with the best weather?

Not always — check both the weather grid and the fare-by-month figures above for this specific destination rather than assuming they match. Shoulder-season months (just before or after peak season) are often the best value.

How far in advance should I book a trip to San Francisco?

As a general industry pattern, booking 4-8 weeks ahead tends to find better fares than booking last-minute or very far in advance — general advice, not a fact about this specific destination.

Is this weather data real or estimated?

Real. It's averaged from 3 years of actual historical daily weather records for this destination's coordinates, not a seasonal guess.

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Best Time to Visit San Francisco

Real month-by-month weather for San Francisco, and real flight prices from London — so "best time" here means something you can check, not a generic guess. August runs warmest (23°C avg high). September currently shows the cheapest real fares.

San Francisco by month: weather & fares

Weather is averaged from 3 years of real historical data. Fares are the real cheapest on file from London that month.

Month	Avg high / low	Avg rainfall	Cheapest fare
January	15° / 8°C	~135mm	—
February	15° / 7°C	~134mm	—
March	15° / 8°C	~152mm	—
April	17° / 9°C	~24mm	—
May	19° / 10°C	~26mm	—
June	20° / 11°C	~0mm	—
July	22° / 13°C	~0mm	€876
August	23° / 14°C	~1mm	€472
September	23° / 14°C	~4mm	€382
October	23° / 13°C	~15mm	—
November	18° / 10°C	~84mm	—
December	15° / 9°C	~140mm	—

Nearby airports

San Carlos Airport (SQL)16 km
Metropolitan Oakland International Airport (OAK)18 km
Norman Y. Mineta San Jose International Airport (SJC)49 km
Buchanan Field (CCR)50 km

Planning tips for San Francisco

Compare the weather and fare columns above together — the cheapest month isn't always the best-weather month.
Shoulder-season travel (just before or after the busiest months) often balances good weather against lower prices.
Book 4-8 weeks ahead where possible — a general pattern, not a guarantee for this specific destination.
Check nearby airports above if San Francisco has real alternatives — a short extra journey can mean a much lower fare.
Factor in local public holidays and school terms at your destination, not just at home — prices and crowds follow both.
Re-check rainfall, not just temperature — a warm month can still be a very wet one.

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FAQs — Best time to visit San Francisco

August has the highest average temperatures, based on 3 years of real historical weather data.