Is It Going to Rain Tomorrow?
"Is it going to rain tomorrow" is one of the most searched weather questions in the world. People ask it before a wedding, a cricket match, a journey, or just to decide whether to take an umbrella. The answer is usually one search away, but understanding what the forecast actually means helps you plan better than a simple yes or no.
On Weather Tomorrow, checking tomorrow's rain takes seconds. Search your city, open its weather page, and look at the hourly forecast and the 10-day forecast. The rain figure is shown in millimetres. If tomorrow shows rain above zero millimetres, rain is expected. A bigger number means heavier rain. This guide explains how that number is produced, what it means, and how much you can trust it.
How Rain Forecasts Are Made
A rain forecast is not a guess. It is the result of a weather model: a huge computer program that simulates the atmosphere. The model starts with the current state of the sky, measured by satellites, weather stations, radar and weather balloons around the world. Then it calculates how the air will move, where clouds will form, and where rain will fall, hour by hour.
Weather Tomorrow uses forecast data from MET Norway, one of the world's most respected weather services. Its models cover the whole planet, including Pakistan, and update several times a day. Every time the model runs with fresh measurements, the rain forecast for tomorrow gets a little more accurate.
That is why the rain forecast can change during the day. A morning forecast might show light rain tomorrow, and the evening update might show none. The forecast is not wrong; it is improving as new data arrives. For a plan that depends on rain, check the forecast again on the day itself.
Rain in Millimetres, Not Percentages
Many weather apps show a rain percentage, like "40% chance of rain". Weather Tomorrow shows rain in millimetres instead, because millimetres answer the question you actually care about: how much rain will fall?
0 mm — No rain. Dry day. No umbrella needed.
0.1 to 1 mm — A light shower. A few drops, maybe a short drizzle. You might not even get wet.
1 to 5 mm — Light to moderate rain. Steady rain for a while. Take an umbrella.
5 to 20 mm — Moderate to heavy rain. Roads get wet, traffic slows, and outdoor plans need cover.
Above 20 mm in a day — Heavy rain. Expect water on roads, possible flooding in low areas, and delays.
A percentage cannot tell you any of this. A "50% chance of rain" could mean a light drizzle or a downpour. Millimetres tell you the amount, so you can decide whether to cancel a plan or just carry an umbrella. If you want the timing too, the hourly forecast page shows rain hour by hour, so you can see when it starts and when it stops.
How Accurate Is Tomorrow's Rain Forecast?
Rain forecasts for tomorrow are usually quite reliable. Tomorrow is only 24 hours away, so the weather model has fresh data and little time for the atmosphere to change its mind. Most of the time, if the forecast says rain tomorrow, it will rain, and if it says dry, it will stay dry.
What the forecast sometimes gets wrong is the exact amount and timing. Rain might start an hour earlier or later than predicted, or fall a little heavier in one part of the city than another. In summer, short thunderstorms are the hardest to predict: they form quickly, cover a small area, and can appear even on a day the forecast called dry. In winter, rain from large weather systems is easier to predict and usually arrives close to the forecast time.
As a rule, trust the rain forecast for tomorrow, but treat forecasts for five or ten days ahead as a trend, not a promise. The 10-day forecast page is best for seeing the general pattern, while the hourly forecast is best for deciding what to do tomorrow.
Will It Rain Tomorrow in Lahore, Karachi or Islamabad?
Rain in Pakistan depends on the season. In the monsoon months, rain is frequent and heavy, especially in Lahore, Islamabad and the northern cities. In winter, rain comes with western weather systems and is usually lighter but can last a full day. Karachi gets less rain than Lahore or Islamabad in most years.
Whatever the season, the fastest check is your city's page. Open the Lahore weather page, the Karachi weather page or the Islamabad weather page, look at tomorrow in the hourly forecast, and read the rain figure in millimetres. That number, not a percentage, is what tells you whether to plan for rain.
The Bottom Line
So, is it going to rain tomorrow? Search your city on Weather Tomorrow, check the rain in millimetres for tomorrow, and you will have your answer. Remember that the forecast improves as tomorrow gets closer, so check again in the morning before you leave. A forecast is a model of the sky, not a promise — but for tomorrow, it is a very good one.
Frequently Asked Questions
Is it going to rain tomorrow in Lahore?
Open the Lahore weather page on Weather Tomorrow and look at the hourly forecast and the 10-day forecast. The rain figure is shown in millimetres: any number above zero means rain is expected, and a bigger number means heavier rain.
What does rain in mm mean?
Rain in millimetres measures how deep the rainwater would be if it stayed where it fell. One millimetre of rain is a light shower, around 5 mm is steady rain, and 20 mm or more in a day is heavy rain.
Why do you show rain in mm instead of a percentage?
A percentage only tells you the chance of any rain at all. Millimetres tell you how much rain is actually expected, which is more useful: 1 mm and 15 mm are both rainy days, but they need very different plans.
How accurate is a rain forecast for tomorrow?
Rain forecasts for tomorrow are usually quite reliable, because tomorrow is only one day ahead. Forecasts become less certain the further ahead they look, so a rain forecast for next week can still change.
Will it rain tomorrow in my city?
Search your city on Weather Tomorrow and check the hourly forecast for tomorrow. The hourly view shows rain hour by hour, so you can see exactly when the rain is expected to start and stop.
About the author
Written by Ahsan Ali, Founder of Weather Tomorrow. He builds Weather Tomorrow from Multan, Pakistan, using live data from MET Norway — free, fast and honest weather for every city in the world.