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https://weather.gov

I live in a coastal area with highly localized weather, and weather.gov gives me by far the best forecast. Sites which only have city-level granularity don't work well when the temperature can be 5-10F different less than a mile away.

Yr.no - also check out their iOS app https://www.yr.no/?spr=eng
I'm in the UK, and always use yr.no for overviews. I love the occasions when a .no site uses their heavy snow icon for what passes for a blizzard around here.

And, I (ab)use the sites of local folk who have their weather stations and webcams available when I'm about to go for a bike ride.

While it doesn't count for much if you're outside of Australia, the BOM (Bureau of meteorology) is probably the best I use.

http://bom.gov.au

https://weather.gov - Primary source

https://windy.com - Neat visualizations

https://darksky.net - Secondary/Quick-glance source

I like Weather Underground for most things. The 10-day graph presents information in a way I find useful and easy to understand. However, for the weather right now I like AccuWeather's MinuteCast. It's eerily accurate. I use them to plan my runs on variable days, and I almost never get caught in the rain if they say it's supposed to be clear. On the other hand, if it says it's going to rain in 23 minutes and I decide to wait for a bit, it practically always does rain in exactly 23 minutes. Ditto for snow in the winter. The exact amounts might be off, but the timing is usually spot on.
https://www.bbc.com/weather/map

Very intuitive and simple weather map

Are there any weather websites with confidence intervals?
They're not confidence intervals, but weather.gov's forecasts include a link to the NWS office's forecast discussion (updated every few hours). This can give you a bit of insight into forecaster uncertainty and the variation between models.

To excerpt the most recent (8:14PM EDT) NYC office's discussion:

"As a result, expect most precipitation to be focused mainly during the evening hours. Hi-resolution models have been suggesting that the overnight hours could be mainly if not entirely dry. This is due to 850 hPa warm front lifting to the north by around 6z and a dry slot moving in from the SW (DC/PHI area). For now, have just lowered pops to chance. If trends in the high resolution models hold, pops will need to be lowered further if not removed for the overnight hours with future updates."

not quite that, but kachelmannwetter.com/weather.us has a mode where they'll show you the results from different models:

https://kachelmannwetter.com/de/vorhersage/2950159-berlin/xl...

https://weather.us/forecast/5128581-new-york/xltrend

When it comes to planning an alpine climb, I use http://www.mountain-forecast.com to judge what sorts of gear I might need. Super niche use-case, but it's better than anything else I've found.
Weather Underground[1], I love their 10-day forecast view with the graphs of temperature, precipitation chance, pressure, and winds.

1) https://wunderground.com

I usually just go here to look at the west coast: http://www.ssd.noaa.gov/PS/TROP/trop-epac.html
weather-util[1] for text forecasts

#IMAGEVIEWER a static url for radar i.e. [2]

weather.gov/"zipcode" for anything needing greater detail

[1]http://fungi.yuggoth.org/weather/

[2]https://radar.weather.gov/lite/N0R/BGM_loop.gif

Out of the scope of the question, my local TV news station gives the most accurate forecast of any other source. Also handy are top of hour terrestrial radio updates and NOAA Weather Radio.

The UI sucks but it gives you the most info: https://radar.weather.gov/radar.php
Not a website, but the german DWD WarnWetter App gets its forecasts directly from the german national weather service (DWD).
on Linux CLI or any its cousins :$ "wttr.in/<your city>" Gives a 3 day forecast that I have found to be quite accurate
$ curl wttr.in/atlanta

Is great if you’re in the terminal.

Google: <place> weather
weather.gov hourly forecast. It has a nice graph :)
graph heavy android app: flowx
Met Office
windy.com

Provides the means for me to look for myself :)

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