Will it rain in North Sumatra?
An hour counts as rainy when the chance of rain is at least 50% or forecast rainfall is at least 0.2 mm.
⏱️ Next 12 hours · North Sumatra
Rain likely
Rain may start around 22:00 — take an umbrella.
- Starts
- 22:00
- Highest chance
- 75%
- Total rainfall
- 3.4 mm
- Rainy hours
- 9/12
Chance of rain by the hour
Taller bar = higher chance · rainy hours are highlighted
- 22:0059%
- 23:0057%
- 00:0060%
- 01:0063%
- 02:0068%
- 03:0074%
- 04:0075%
- 05:0067%
- 06:0054%
- 07:0043%
- 08:0036%
- 09:0032%
Staying dry
- Umbrella from 50%At a 50% chance or more, take an umbrella or a light raincoat.
- Check the radar firstRadar shows where rain clouds are and where they are heading over the next 1–2 hours.
- Avoid open ground in stormsIn thunderstorms, keep away from tall trees, open ground and water; get into a solid building.
- Rain forecasts change fastSummer showers are hard to time exactly — check again before you head out.
Rain forecast FAQ
What does a “40% chance of rain” mean?
It is the model's probability of measurable rain at that spot in that hour. 40% does not mean rain for 40% of the time or area — just that 4 in 10 similar forecasts bring rain.
How does this page decide it will rain?
An hour counts as rainy at a chance of at least 50% or forecast rainfall of at least 0.2 mm. The answer is “Rain likely” when at least one of the next 12 hours reaches that.
How much rain is heavy rain?
Under 1 mm/h is light, 1–4 mm/h moderate, over 4 mm/h heavy; over 50 mm a day can cause local flooding.