Here are a few tips on how to manage them - especially how to avoid those conditions that are a threat to their health.
- Wet leaves for prolonged periods will result in fungal disease and kill them!
- Soil that is soddon through heavy rain will be air-less and the plants will struggle.
- Cold temperatures combined with wet leaves will result in tomato blight.
- Even when growing outdoors, try to shelter them from rain.
Of course a drop of rain on a warm day won't do them any harm, but wet leaves overnight when temperatures drop is a problem - especially if they are stood in soaking wet soil.