Are these strawberries ripe, and did the rain make them crack?

The rain is a likely reason for the cracking. A sudden increase in water can split ripe berries. Pick the cracked ones and check them for mold or soft, spoiled spots before eating.

For ripeness, look at the berry’s color rather than its size. If it’s red all over, it’s generally ready to pick. A taste test is useful if you’re unsure.

Small doesn’t necessarily mean unfinished. Berry size can vary by variety, and once a strawberry starts turning red it won’t get much bigger. I’d harvest fully red fruit promptly, before it gets too soft or something else finds it.

I wouldn’t change fertilizer or watering based on dullness alone. That look, or the color of the seeds, doesn’t tell you enough by itself to diagnose a watering or nutrient problem. Keep an eye on how the next berries develop, and try to avoid big swings between dry soil and lots of water if you can.

There can be a difference of opinion about a dull berry being overripe, so check its firmness and taste rather than relying on shine.