I write not knowing what other clothing you have when en route.
Rather than have several one-purpose tops (such as
Altus and a Jacket) I suggest you consider the "layers" approach.
This involves adding more layers the colder it gets. Having said that I am conscious the cold (and heat) are in the "eye of the beholder"
Outer layer is both wind and rain proof -
Altus is a good example - I wear a parka (and rain kilt).
My experience suggests wearing up to three inner layers:
1) short sleeve top - for me 150 gsm
(a) merino
(b)
2) long sleeve top - for me 180-200 gsm merino
3) short sleeve top - for me 150 gsm merino
For me July is my mid winter - day break temperatures around 5 Celsius
My starting wear is either a short and long sleeve top or, if really windy, one of those plus outer layer
As both the day and I warm up, I expect to shed the current top layer within about an hour.
You can also search the forum for "layers" and see what you get.
(a) gsm = grams per square metre - and indication of the weight of the garment
(b) merino = merino wool - breathes - absorbs body odours - wash every 3-4 days - dries quickly
@SFHoneybee I say kia kaha, kia māia, kia manawanui (take care, be strong, brave and confident)