Heavy rains and a small volume of soil in containers will result in nutrients being flushed out if there isn't enough time between the application and the rain for the plants to absorb the nutrients.
If we're having a long stretch of heavy rain, or if we go away for more than a week as we tend to do every June, I switch over to a granular/slow release fertilizer (Tomato Tone) until the rainy period ends or until we get home from our trip. This way they are still being fed without me having to continue dumping more water and fertilizer on them to keep them healthy and avoid stuff like BER.
Where you're drenching them daily during rainy stretches, there may be enough nutrients remaining in the container long enough for the plants to take it up, but a typical TTF feeding schedule for containers is once a week.
If they look good, then it's your call.
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