We have a nice stand of Fallgold raspberry canes, at my daughter's house in Utah. She says the berries in June were either dried up or very seedy and not juicy or much flesh on them.

We now have the second flush of berries coming along, and a run of 100+ degree weather as well. Starting to see a little color on the berries but they're still not looking juicy or at all fleshy, shall we say. On the small and seedy side again.

Are we just not watering enough, or what?

I was here this spring, got trapped by the shut down and stayed to home-school my grandkids from mid-March until the beginning of June. So I did amend the soil, added compost and mulched the raspberries and fertilized them at the end of May. the soil is amended clay, and the water is slightly alkaline but not bad.

Given the plant looks otherwise healthy my first thought would be lack of pollination.

While many would recommend planting the usual stuff (borage, Russian sage, zinnia etc) to attract pollinators, one should also remember in 100F weather most pollinators are either inactive or merely looking for water. Night pollinators, the most active in hot deserts/scrubland areas (like most of Utah is), generally prefer strong-scented plants like honeysuckles and Marvel of Peru over mild stuff like raspberries so they are unlikely to come to the rescue.

Ahh, thanks! That may explain it, although I do see a number of bees on the plants when I'm out in the evenings. I have Russian sage right next to the raspberries, and zinnias close by, too.

There is huge planting of honeysuckle on the fence about 30ft.away, as well. A massive bush of lavender was just starting to bloom when I left in June so that may have distracted the bees away from the raspberries earlier, as well. <sigh>
Cute bees with a red stripe