Weather: Helsinki Half Marathon
Historical weather data for race day in May. Use this to plan your race strategy, clothing, and hydration.
🌡️
12°C
Temperature
Range: 8°C – 16°C
💧
65%
Humidity
Moderate
🌧️
45%
Rain Chance
Possible — check forecast
📅
May
Typical race month
Usually on a Sunday
📝 Conditions
Late spring in Helsinki brings mild temperatures with occasional rain. Runners should expect cool conditions typical of Nordic early summer, with long daylight hours and invigorating sea breezes along the route.
👟 What to Wear
Light gloves
Useful at the start, tuck away later
Long sleeve or arm warmers
Versatile for cool starts
Hat with brim
Keep rain out of your eyes
Anti-chafe cream
Wet conditions increase chafing risk
💧 Hydration Strategy
Before the Race
Normal hydration. Drink to thirst in the 24 hours before. Avoid over-hydrating.
During the Race
Drink at aid stations every 3-4km. Alternate water and sports drink.
After the Race
Rehydrate within 30 minutes of finishing. A drink with electrolytes and some protein helps recovery.
Get Your Training Plan
Free, personalized for this race
Get race tips & guides in your inbox
Race tips, training guides, and the latest from 500+ races worldwide.