IN GENERAL: Microclimates

San Francisco. 7x7 miles. The city has dozens of unique nieghborhoods waiting to be discovered. Likewise, the city has as many microclimates as it does neighborhoods. That's to say, a few blocks, a hill, a few minutes, and even a turned corner (it's true) can change what you thought was a gorgeous sunny day into a siberian wind storm. No kidding!

To give you an idea, a haiku:

can't escape the fog

not too hot never too cold

who knows how to dress

And now, time for a very scientific + psychedelic breakdown of microclimates:

(click the map for a massive color freakout version!)

SUNNY + WARM:
Mission
Castro
Potrero Hill
Nob Hill
Bayview
North Beach
Chinatown

WARMISH / PRONE TO FOG or WIND:

Haight

Lower Haight

Hayes Valley
SOMA

Downtown/FiDi/Tenderloin

CHILLY:

Inner Richmond

Inner Sunset

Outer (South) Mission

Excelsior 

STRAIGHT UP COLD:

Twin Peaks

Outer Sunset
Outer Richmond
Presidio

Looking West, fog pours over Twin Peaks:

You can use the peaks as your weather guide. The fog will come rushing in like water overflowing a full tub. Time to grab the hoodie and head for shelter!
(A 10 degree weather change seems like a big deal in SF since weather tends to vary btwn 50 -75 degrees throughout the year)

Overheard: 

'I never know how to dress in this town.'

Which is why I tend to lug around extra clothes/layers with me all day long..
but at least at the end of the night my bag is super light!