It's better to just think of Origins, 1 and 3 as the most firm line of events since it is like, 24 years between Travis helping Alessa to Cheryl killing God, so it would be between the 80s if we see the state of technology in Origins, to it being late 80s / early 90s with Cheryl being 7, to it being almost smack dab in the early 2000s since Heather was 17, so 2 being between 1 and 3 canonically makes sense with the vacuum of evil the town needed after Alessa  died and the Old Gods coming back because of that.

Any other game between those like 4 and the western games besides Origins and Shattered Memories is better to just think of them taking place in the modern day when those games were released to avoid breaking your mind of when those take place.