My favorite weather map for SF is PurpleAir: https://map.purpleair.com/environment-estimated-temerature-f...

There are thousands of sensors around the city. You can get a sense of shade-vs-sun temperatures by the spread of numbers you see (on cloudy days, the reported temperatures will be much closer together, while on sunny days, sensors in the sun will report elevated temperatures.)

You do need to make sure to disable indoor sensors, and keep in mind that some sensors are faulty. (I've seen some that have been reporting a constant temperature for years.)

How does this compare to https://www.wunderground.com ?

Is that the source of the data?

Is it possible to get individual sensor data via this API?

Can you do celsius

It seems weird to me that there's no human readable version on the webpage?

Usually what I want the weather for is to choose what to wear, not to put in a bash script or an LLM or something.

This happens in Portland as well! Can this be adapted/updated to work here?

I made a quick website from this API that shows all of the neighborhoods, searchable, sortable.

https://v0-weather-app-one-coral.vercel.app/

Surprisingly, Lands End is the highest temp right now.

Multiple neighborhoods have no data, including Lakeside and Stonestown.

An interesting problem with self-reported temperature is that people just put their outdoor sensors inside for some reason or near an ambient heat source; also in neighborhoods with tall buildings, it's a bit colder higher up, so the balcony readers are a bit off from sidewalk temperature, it is interesting to see though that one block from another is super different in temp, is it because it's actually different or is there something heating/cooling the sensor off randomly

I use PurpleAir data for a lot of my home automations— I have a smart window vent and configure it to blow in/out depending on which side has the worse air.

(Thank you to those who maintain public sensors!)

I do notice that in my neighborhood (Noe Valley) a lot of the sensors are very incorrect or often offline. I've resorted to taking the median and throwing outliers away, but even this often doesn't work. This is the challenge of relying on crowdsourced data I suppose...

Love the idea, but tried "japantown" which is mentioned in the README but doesn't exist in the app? https://microclimates.solofounders.com/sf-weather/japantown

Love it

Hacked together an SF parks ranking system based on current weather

https://sfparks.nathanflurry.com/

As a Meteorologist, I love this! There is one little thing to be aware of with using Purple Air for temperatures, though, as their primary purpose is AQI not temp, all temp data comes with this disclaimer. That said, everything is still at lease directionally accurate.

"Temperature, estimated using a formula temp = 1.0227 * raw_temp_f - 9.3755 developed by Lance Wallace to account for heat generated by the WiFi module and other electronics in a PurpleAir sensor. This will not be accurate for all situations. More information can be found in Lance Wallace's notes."