Hi,
I have Acura RDX 2015 model. Since I moved from Seattle to Kansas City, based on different temperature (which swings from 20 to near 100), I keep seeing different alert for tire pressure. My daily commute is around 50 miles.
Please see these two pictures in this link, which were taken just couple of days away - Imgur: The magic of the Internet
What TP should I keep ideally which would be okay for cold as well as hot weather?
Please advice.
Thanks
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Just use what it says on the door jamb sticker.
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System should show you which tire it has issue with. Is 1 tire low? I think some systems also do not like pressures that are too high.
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Depend on weather/temperature system keep changing the alert. Sometime it would be just one tire, sometime 4 and someone no TP alert at all 
33 front, 35 rear is where you should start when the tire is cold. Don’t worry so much about daily temp changes, just seasonal. Your pressures are way low. Check your manual.
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Tester
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This site’s spec for Acura 2015 RDX concurs:
On the same day?
If the morning temperature is 20 F; set the tire pressure while at 20 F.
If the morning temperature during the summer is 70 F; set the pressure while the tires are 70 F.
The tire pressures shown on your dash indicates that you have not added air to the tires since last summer. You must add air from time to time; you cannot select one pressure and “set-it-and-forget-it”.
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No surprise there in the difference in tire pressure, there is a difference of 30° between the two readings and you can reasonably expect about 1-PSI increase/decrease with every 10-degrees difference in temperature… And I’m not blowing Hot Air… 
If you are using the same size stock tires as recommended for your vehicle, the tag on the Door Jam will be your best source for information. Get yourself a good quality tire pressure gauge and set it to the specs on the door jam.
As has already been noted, temperature matters… Your tire pressure will also go up after your 50-mile commute… The manufacturer establishes the recommended tire pressure based on the "Standard Day – 59°…).
When you adjust the tire pressure, for every 10-degrees above 59°, reduce the pressure by one-pound, for every 10-degrees below 59°, add one extra pound…
But for all intents and purposes, unless you are at the extremes of your local temperature range (20° to 100°), just fill the tires to the recommended pressure
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If you’ve never changed the batteries in the tire sensors, it may be time to do that.
I don’t know of a single shop that changes the batteries in tire sensors.
Too time consuming, it’s hard to do without damaging the sensor. and it makes the sensor less reliable.
It’s more economical and reliable to just replace the sensor.
Tester
I read about that somewhere, and how I interpret it is as follows:
If the early morning temperature = F59°, and 32psi is ones OE cold tire pressure, set to 32psi.
For the following range of temperatures:
F89: 29psi
79: 30psi
69: 31psi
59: 32psi as discussed
49: 33psi
39: 34psi
29: 35psi
And so on.
I would like to hear the senior tire whisperer’s take on this..!
For me, irrespective of the time of year, and whether the temperature at dawn is 19 or 79, when I check tires, I set them to the spec on the door placard. For me that’s 32psi, summer or winter. For my friend’s late model Tucson, it’s 35psi.
This is incorrect. If the tires are at the lowest temperature of the day (typically in the early morning after sitting outside all night), then they should be at the recommended cold pressure, no matter what that temperature is.
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Temperature does matter and if you start off with cold, really cold tires (as you say, “no matter what the temperature is…”) the pressure will climb about 1-pound for every 10-degree climb in temperature… It might be a pleasant 70° outside, but your tires, on the blacktop, at highway speed, are going to be a lot hotter (heat from the road, flexing of the rubber…), and you could see a 10-pound climb in tire pressure…
The OP was originally only concerned with a 3-pound difference… and not knowing if the tires had been driven on prior to the photo being taken, I tried to explain that the difference might only have been caused by the ambient temperature difference…
Please refer back to my previous posting…
or don’t take my word for it…
Your reply is misleading, you are going to confuse people.
Whose reply? Context, lol!
Let’s all calm down and wait for Da (tire) Man, to arrive.
The recommended pressure on the sticker is the cold inflation pressure, set the tire to that first thing in the morning, summer, winter, whenever.
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You’re right. I should phrase better.
edited, I hope this clears it up…
Included in this link:
Taking Tire Temperature Into Account: TPMS Service
Is the chart that propogated the myth of adjusting cold tire pressure setting at every decade (temperature in tens) ambient temperature.
And the chart itself:
It appears to use a base temp of F70 degrees, and suggests that 1psi be added to cold tire pressures per decade drop in outside temperature.
It’s confusing and requires ordinary drivers to think about correct tire pressure too much, when all the relevant info. is right on the door frame pillar placard, or a similar placard located in the glovebox lid or fuel filler lid.