Right now I’m doing a tour with the Kodiak from Ushaia to New York and therefore I have to fly a lot in remote locations with no ATIS nearby. Something I always struggle with is to know which QNH to use, especially when I enter a pattern where the altitude is important. I don’t want to rely on the B key because it’s unrealistic. I guess you can ask ATC for flight following but to my knowledge this is mostly used in the US.
How do you guys obtain current QNH?
I get you, but the lack of interactivity with the ATC is pretty unrealistic too. I just google the relevant metar.
I find this a very interesting question. How would a rl pilot go about this. Does (s)he take a rl barometer on the plane?
For purposes of the Sim - hit the B key at the ramp. That will give you local barometer.
The OP doesn’t want to do this because this is not realistic.
There’s no sim way to do it. You can rely on external sources, but there’s a limit to what can be recreated. To be fair - there’s many airports where you would have to use a Telephone Line to get Flight Services (just like the old days) and get ASOS data. Pretend you picked up the phone and talked to someone when hit B.
In real life, on the ramp, we can use any number of cell phone apps to get QNH. These days, almost all cell phones have the hardware to detect barometric pressure.
In the sim? Use the “B” key. You can pretend you’re using your cell phone. 
And does “B” get the local QNH from meteoblue?
Here in the UK we have altimeter setting regions. Each region will have a current QNH which updated frequently and are available to pilots via ATC or on-line etc. All aircraft flying in that region below the transition altitude will use that pressure setting unless taking off or landing.
If you are operating outside of ATC coverage for the entire flight, then prior planning with synoptic charts and METARS/TAFs becomes important, of course if you’re entirely VFR without ATC you will know the elevation of your departure point so you can just dial that on your altimeter to find the QNH and using the synoptic charts pressure gradient, work out the forecast pressure/QNH from the charted airfield elevation for your destination.
Use a Metar Avionic Weather app. That’s showing everything you need for everywhere you want. I use Avia Weather for my flight planning.
B pulls the local baro reading for the sector you are in and applies it to your in-cockpit control. It works even if you never hear ATC make a call directly to you or to aircraft around you. It works for Live and Preset Weather.
Yes, I was aware of that and use the “b” extensively myself. Just was curious wherefrom the in sim QNH was pulled. Tx.
If a METAR report isn’t available, I’d recommend using either the “Clouds, 3h precipitation” or “Satellite and pressure” legacy map presets on Meteoblue (since this is the weather system MFS tries to replicate) .
You should see the QNH readings along the lines.
IRL would Center be able to give you the QNH?
This is assuming your not so remote as to not have Center coverage.
What I do when I have no weather data - pull up a chart of the airport (which you should always have if playing “realistically”). It will tell you the elevation of the runway. Adjust your barometer until your altitude matches that of the charts. That will be close enough for the purposes of taking off.
When in the air though, you gotta wing it.
If there is no air traffic control and no internet connection then there is no way to get QNH. It can‘t be measured by a satellite, it requires a ground station and a way to tell you. If there is no way then please, use your eyes and look out of the window. You‘re a pilot, not a system commander. Fly the airplane, don‘t rely on others. An altimeter can fail, too.
Edit: if you‘re on the ground it‘s of course simple: look at the post above this ^^
Since this is a weather related question.
How do you guys who fly VFR around uncontrolled aerodromes, know what way the wind is blowing when you want to land at a marked airstrip in MSFS that is missing a windsock. What indicators work in MSFS and what missing indicators you real world pilots use that would be great if implemented. What do you guys
In real life do most/all airstrips (such as farm/fertilizer strips) have windsocks
With the exception of rough fields, private strips and the like, many uncontrolled airports have at a minimum ASOS/AWOS which gives you among other things, current wind direction/speed, temp, dewpoint, altimeter reading and sky conditions.
If you’re flying a Glass Cockpit plane, many have wind vector readouts that you can enable to give you relative wind and speed.
At the moment, there’s not enough visual cues aside from the windsock. There are third party scenery providers who build things like real world smokestacks for visual cues, but I’m not certain the smoke trail conforms with the prevailing wind.
Awesome thanks for that mate. So unless I’m in a glass cockpit aircraft, if I see a known grass strip that’s not been implemented in the game. The current lack of visual wind clues
It’s really just a guessing game as to what way to land, unless it’s a incredibly gusty day
The problem is for many airports, you can’t see the windsocks unless you’re very close and often well under pattern altitude. And first, we have to find them. With bespoke airports, be they stock ones or 3rd party, you can look at charts, see the windsock locations, and expect to find the windsocks where they’re supposed to be. For auto-gen airports, windsocks could be anywhere at all.
