Hello.? First time doing the JMT.? Thru-hiking beginning last week of August this year (2023).? I borrow a Versalite (Western Mountaineering) 10 degree bag.? Is this going to be too warm?

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Too warm is much better than too cold. ?There will be nights when you’ll be glad of it, and nights when you leave a bunch of body parts sticking out of it.

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I use a 0 degree quilt - of course with that it’s much easier to stick arms or legs out.

Take the Versalite, I believe it only weighs 2.1 lbs and most 20F bags weigh more than that,

I echo what others have said. I am admittedly a cold sleeper. I have an EE Revelation 20. I trust that rating, but for it to work at 20° for me, I use a silk liner and an X-Therm pad (amazing!) and wear multiple layers including my EE Torrid hoodie (also amazing) and a Smartwool beanie. I think the liner alone adds 10 degrees of warmth, not to mention it keeps the quilt much cleaner. Cozy warmth at night makes my whole next day a lot more pleasant too.?

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I second Larry- I switched from my Alpenlite to Versalite last year - is fantastic!?

I used a 15 degree sleeping bag for years in the Sierra Nevada and the only time I was too warm was camping at the front country Lodgepole at Sequoia National Park in mid August before hiking the High Sierra Trail connecting to the JMT. I just kept the bag partially open and it was fine.?

I subsequently switched from sleeping bags to quilts. I now have two quilts - a 10 degree from zPacks and a 30 degree from Enlightened Equipment. Everyone is different but for me the "comfort" rating is about 10 degrees more than the actual rating. I have never taken the 30 degree quilt to the high Sierra and doubt I would in the future. The 10 degree has kept me warm and I just open it up if it gets too warm.?

I don't know if I will be able to make a trip work this year but if I do, it will probably toward the later part of September. If I made that trip work, I might actually take both quilts and use the 10F inside the 30F. because I would expect potential nighttime temps in the teens or perhaps even lower where I would be going (Rae Lakes or 60 lakes). It would only be a short trip from Onion Valley for probably 2-3 nights, so food weight would be quite low, and the extra weight of the 30F quilt is only just over a pound.