Training and riding outdoors during bad weather conditions is something that every cyclist, pro or amateur, will go through. Here is couple of tips that you can use, so your riding can be more bearable:
The most important part is preparation, like clothing, bike setup and riding location. It is always impossible to stay completely dry when cycling in such conditions, but with good selection with clothing and gear you will be more exempt from wet and moisture.
First of all bring your jacket or soft-shell and waterproof overshoes, because last thing you want is wet feet and back. Also bring a cap and put it under helmet. It will provide some insulation for your head and keeping some water from your eyes.
Rainy weather will often bring poor visibility, so you need to be more visible for other participants in traffic for your own safety. Make sure you have small tail / head lights and reflective stripes on your bicycle. It is also worth thinking about wearing fluorescent cycling kit.
Image Source: Etoday.ru
When your clothing is selected next ups is your bike setup. For better grip on wet road, reduce tire pressure a bit. That will increase contact surface on tarmac and will provide you with better tire grip. Consider also having wider tires with deeper treads along with putting a thick wet weather lubricant on chain for more resistance to moisture and durability. There is nothing worse than riding with dry chain right after heavy raining, because it could damage the whole gearing. If you are planning to rice on wet tarmac more often, reconsider buying some mudguards. They can fit on just about any bike and give you very good protection from wet conditions.
You can help yourself a lot by thinking more about riding locations. One of the big problems with bad weather is getting cold, so avoid long 2-4 h rides and big climbs because of them you will also have big descents. On downhill you are not producing much effort on pedaling because focusing on handling on rainy road. Following that you have unavoidable wind-chill drag, so there is high chance for freezing. Consider riding loops near your home, that way if weather turns worse, you can return and quickly avoid unpleasant weather.
Another important thing is handling, especially cornering and braking. As we all know, the main problem for cycling in the rainy conditions is reduced tire grip followed with not as good breaking. For starters, ride slower with more cadence, so that way will be less situation for hard breaking. While going downhill, you need to start breaking much earlier. This will give you more time to reduce your speed in order to safely take corner and it will give the brakes time to clear water of the wheel rims. Be careful at this point, because the brakes can suddenly lock the wheel if the water is cleared of, so do not squeeze brake-levers to tight. Watch for wet tarmac all the time, it is uncertain where the traction is the highest or lowest and avoid edges of the road because chunks of gravel with possible accumulation of water that could become dangerous to the cyclists. Also be careful not to cross in corner over painted white lines or metal chain covers. They can be slick as an ice and you can easily loose balance.