Cold Temperature 

Dragon boat paddling is a very energy-consuming activity, thus, our body dissipates large amount of heat. Hypothermia may result if our body may dissipate more heat than we absorb if the air temperature is too low. Wearing gloves, ColdGearLinks to an external site. (This is what I'd wear to keep myself warm!) under other clothes and/or jacket help maintain warmth. 

In Vancouver, All Dragon ZoneLinks to an external site. (where I paddle, just beside Science World) practices is cancelled if the temperature is below 0°C. However, even at temperature above this, wearing gloves and enough clothing is essential.

Sun

Paddling in a warm, sunny day is relaxing and enjoyable, but prolonged exposure to UV on a sunny day is harmful in many ways: It can cause premature skin aging, eye problems, and other skin related problems. If paddling under clear skies, always wear water-proof sunscreen, hats, and long sleeves. 

Precipitation (Rain)

In general, it is fine to paddle in light rain. However, paddling in heavy precipitation is associated with reduced visibility and cold temperatures (it makes you feel much colder since your body gets wet). Thus, it is best to be avoided.

However, if the precipitation is due to thunderstorm, then the activity should be cancelled. Thunderstorms are often associated with strong downburst winds, lightning, and hail, which are hazardous to paddling. 

Wind and Waves 

Since dragon boat races/ practices are normally held in rivers or creeks, we usually don't see swell, which are formed by distance storms, and rogue waves, which are very large waves formed by interference. However, strong wind can cause heavy waves (wind-generated waves). Dragon boats don't usually capsize in waves (but possible!). In strong waves, water enters the watercraft easily, which adds weight to the boat and paddlers must remove extra water with a pail frequently to avoid sinking. Water in the boat also affects balance and causes swinging, making the boat harder to move forward and easier to tip over. 

https://news.mb.com.ph/2018/04/13/waiting-for-rescue/

Photo: Juan Carlo de Vela. Nov 18th, 2018