Will it rain tomorrow in Granby?

rain likely. Rain: 23 mm. Low 4 °C, High 17 °C.

What will the weather be like at the weekend in Granby?

Sat 17/10: clear sky, -1 °C / 7 °C, no rain expected.

How far ahead does this Granby forecast go?

This page shows 7 days. The model run used here is from 16/10/2026, 01:17 UTC, and the page fetches a new one every 30 minutes.

Granby weather

Temperature, rain and wind in Granby (Quebec, Canada), a city of about 66,222 people: how it is right now, hour by hour into tomorrow, the next 7 days and what each month of the year is like.

Right now

Thursday 15 October, 23:00 (America/Toronto)

4 °C

Partly cloudy

Feels like

2 °C

Humidity

83%

Wind

11 km/h

E · Beaufort 2

Dew point

2 °C

Cloud cover

88%

Pressure

1,020 hPa

Hour by hour

Next 24 hours, in the city’s local time.

Time	Conditions	Temperature	Rain	Wind
22:00	Partly cloudy	5 °C	0.0 mm	8 km/h
23:00	Partly cloudy	4 °C	0.0 mm	11 km/h
00:00	Partly cloudy	5 °C	0.0 mm	13 km/h
01:00	Cloudy	6 °C	0.0 mm	15 km/h
02:00	Cloudy	7 °C	0.0 mm	14 km/h
03:00	Cloudy	8 °C	0.0 mm	16 km/h
04:00	Cloudy	8 °C	0.0 mm	17 km/h
05:00	Heavy rain	9 °C	1.3 mm	17 km/h
06:00	Heavy rain	7 °C	4.1 mm	17 km/h
07:00	Heavy rain	7 °C	3.9 mm	22 km/h
08:00	Heavy rain	7 °C	1.4 mm	22 km/h
09:00	Heavy rain	8 °C	2.3 mm	25 km/h
10:00	Heavy rain	9 °C	1.7 mm	16 km/h
11:00	Rain	11 °C	0.5 mm	18 km/h
12:00	Light rain	13 °C	0.1 mm	28 km/h
13:00	Rain	15 °C	0.6 mm	30 km/h
14:00	Heavy rain showers	17 °C	1.6 mm	30 km/h
15:00	Heavy rain	17 °C	1.2 mm	27 km/h
16:00	Heavy rain	16 °C	2.6 mm	24 km/h
17:00	Heavy rain	15 °C	1.3 mm	26 km/h
18:00	Light rain	13 °C	0.2 mm	21 km/h
19:00	Cloudy	11 °C	0.0 mm	24 km/h
20:00	Cloudy	9 °C	0.0 mm	21 km/h
21:00	Cloudy	8 °C	0.0 mm	22 km/h

Next 7 days

Day	Conditions	Low	High	Rain outlook
Thu 15/10	Partly cloudy	4 °C	9 °C	no rain expected · 0.0 mm
Fri 16/10	Light rain	4 °C	17 °C	rain likely · 23 mm
Sat 17/10	Clear sky	-1 °C	7 °C	no rain expected · 0.0 mm
Mon 19/10	Clear sky	6 °C	16 °C	no rain expected · 0.0 mm
Tue 20/10	Clear sky	4 °C	15 °C	no rain expected · 0.0 mm
Wed 21/10	Clear sky	3 °C	13 °C	no rain expected · 0.0 mm
Thu 22/10	Fair	4 °C	15 °C	no rain expected · 0.0 mm

This column is our own reading: the global model does not publish a probability of precipitation for this region, so we classify the day from the forecast symbol and the total in millimetres. It is not an official probability figure.

Our own chart, drawn from the 7-day forecast for Granby shown above.

What each number means

Rain (mm): 1 millimetre of rain is 1 litre of water per square metre. Up to 2 mm in a day is drizzle; from 10 mm it is proper rain; more than 50 mm in a few hours is the amount that floods streets.
Humidity: Relative humidity is how much water vapour the air holds compared with the most it can hold at that temperature. Above 80% sweat evaporates slowly and heat feels worse; below 30% your throat and eyes dry out.
Dew point: The dew point is the temperature at which the air would start to condense. The closer it is to the air temperature, the muggier it feels. Above 20 °C the air already feels heavy.
Feels like: "Feels like" combines temperature, wind and humidity: strong wind carries heat away from the body, so it feels colder than the thermometer; high humidity in the heat makes it feel warmer.
Wind: Wind is given as a speed and the direction it blows from. Up to 20 km/h you barely notice it; at 40 km/h it moves branches and parasols; above 60 km/h it brings down trees and roof tiles.
Cloud cover: Cloud cover as a percentage is how much of the sky is covered. Up to 20% is a clear sky; above 80% the sun barely gets through.
Chance of rain: The model does not publish a probability of precipitation for this region. This column is our own reading: the global model does not publish a probability of precipitation for this region, so we classify the day from the forecast symbol and the total in millimetres. It is not an official probability figure.

Month-by-month climate

In October, Granby averages 8 °C and about 116 mm of rain over the month, on the 25-year Meteorological and Solar Monthly & Annual Climatologies (January 2001 - December 2025) climatology.

Warmest month

July

Coldest month

January

Wettest month

October

Driest month

February

Month	Mean temperature	Rain	Mean humidity
January	-11 °C	65 mm	94%
February	-9 °C	62 mm	94%
March	-4 °C	73 mm	89%
April	4 °C	89 mm	82%
May	12 °C	96 mm	80%
June	17 °C	115 mm	81%
July	20 °C	107 mm	82%
August	19 °C	109 mm	82%
September	15 °C	90 mm	81%
October	8 °C	116 mm	84%
November	1 °C	80 mm	88%
December	-6 °C	90 mm	93%

Our own chart, from the NASA POWER 25-year Meteorological and Solar Monthly & Annual Climatologies (January 2001 - December 2025) climatology for the coordinates of Granby.

Frequently asked questions

Will it rain tomorrow in Granby?: rain likely. Rain: 23 mm. Low 4 °C, High 17 °C.
What is the temperature in Granby right now?: 4 °C, partly cloudy. Feels like: 2 °C. Humidity: 83%.
What will the weather be like at the weekend in Granby?: Sat 17/10: clear sky, -1 °C / 7 °C, no rain expected.
Which is the wettest month in Granby?: October — ~116 mm (25-year Meteorological and Solar Monthly & Annual Climatologies (January 2001 - December 2025), NASA POWER).
How far ahead does this Granby forecast go?: This page shows 7 days. The model run used here is from 16/10/2026, 01:17 UTC, and the page fetches a new one every 30 minutes.

Nearby cities

Forecasts for places near Granby:

How to read this page

How to read the min and the max

The week’s high (17 °C) arrives in the afternoon, about two hours after solar noon; the low (-1 °C) just before sunrise. Both are air temperature in the shade, two metres above ground — in direct sun or over asphalt a thermometer reads higher.

Where this number comes from

The Granby forecast comes from MET Norway, a partir do ECMWF HRES e, na área nórdica, do MEPS, run of 16/10/2026, 01:17 UTC. The month-by-month climate comes from NASA POWER, climatology of 25-year Meteorological and Solar Monthly & Annual Climatologies (January 2001 - December 2025). Both are credited in full at the foot of this page.

What a forecast cannot promise

Out to two days accuracy is high; by day seven the trend matters more than the exact figure. For Granby the model publishes no rain probability, so the expectation column is our reading.

Severe weather warnings

This page is informational. For official warnings of storms, gales or flooding affecting Granby, go to your national weather service through the World Meteorological Organization warning portal.

WMO Severe Weather Information Centre

Understanding the weather and climate of Granby

Is this week in Granby above or below the October normal?

The average of the next 7 days in Granby works out at 8 °C, against a normal of 8 °C for October over 25-year Meteorological and Solar Monthly & Annual Climatologies (January 2001 - December 2025). The gap is under one degree, so the week sits squarely inside what the season normally brings.

Within the week the highest maximum lands on Fri 16/10 (17 °C) and the lowest minimum on Sat 17/10 (-1 °C). Forecast rain adds up to 23 mm, roughly 20% of everything Granby gets in an average October (116 mm). The wettest day is Fri 16/10, with 23 mm.

When is the wettest and the driest month in Granby?

On the 25-year Meteorological and Solar Monthly & Annual Climatologies (January 2001 - December 2025) climatology, the wettest month in Granby is October, at about 116 mm, and the driest is February, at 62 mm. The two extremes differ by only 1.9 times, which means rain is spread fairly evenly across the year in Granby. For October, the month you are reading this in, the average is 116 mm.

What does the dew point say about how Granby feels?

Right now in Granby the air is at 4 °C with a dew point of 2 °C and relative humidity of 83%. With the two values that close, sweat evaporates slowly and the heat weighs more than the thermometer suggests — that is the working definition of muggy.

What is the climate of Granby like through the year?

The warmest month in Granby is July (20 °C on average) and the coldest is January (-11 °C), a swing of about 31 °C around an annual mean of 6 °C. A swing above twenty degrees is continental: summer and winter are almost two climates at the same address.

Because Granby lies in the northern hemisphere, at 45.40° north, summer falls in June, July and August, in the middle of the calendar.

How far is Granby from Longueuil?

The nearest large city to Granby is Longueuil, about 59 km away in a straight line, to the west, with 229,330 inhabitants. In that band the temperature of the two rarely differs by more than a degree or two, but a summer downpour can hit one and miss the other: heat showers are only a few kilometres wide. Being larger, Longueuil shows up in more searches, and plenty of people end up reading its forecast assuming it covers Granby.

Words on this page

Apparent temperature

The temperature the body actually feels, rather than the one on the thermometer. It combines air temperature with wind, which carries heat away faster, and humidity, which slows the evaporation of sweat. That is why 30 °C in dry air with a breeze is easier than 28 °C in still, muggy air.

Apparent temperature

Dew point

The temperature air would have to cool to, at constant pressure and moisture, for water to start condensing. The closer the dew point sits to the air temperature, the less room the vapour has and the muggier the day feels.

Dew point

Millimetre of rain

The depth of water rain would leave on a flat surface with no run-off. One millimetre is one litre per square metre, no matter how large the area measured is.

Standard definition by World Meteorological Organization (WMO) · Millimetre of rain

Relative humidity

How much water vapour the air holds compared with the most it could hold at that temperature, as a percentage. Because that ceiling rises with heat, the same amount of vapour reads high at dawn and low in the afternoon.

Relative humidity

Climate normal

The average of a climate element — temperature, rainfall, humidity — computed over a long, standardised period, usually thirty years. It does not predict anything: it says what is typical for that place in that month, and gives you a ruler for calling a week warm or wet.

Standard definition by World Meteorological Organization (WMO) · Climate normal

Forecast model

A program that solves the equations of the atmosphere on a grid of points and steps forward in time from the state observed now. Your city forecast is the model value at the nearest grid point, which is why two neighbouring towns get almost the same numbers.

Standard definition by MET Norway (Meteorologisk institutt) · Forecast model

Model run

The time the model was executed with the latest observations. Every forecast belongs to a run, and runs age: one from six hours ago knows nothing about the shower that started afterwards. It is the first thing to check when two sources disagree.

Standard definition by MET Norway (Meteorologisk institutt) · Model run

See the full weather glossary

Source, model and licence

Model: MET Norway, a partir do ECMWF HRES e, na área nórdica, do MEPS
Model run: 16/10/2026, 01:17 UTC
Source: MET Norway (Meteorologisk institutt) — Locationforecast 2.0 — Based on data from MET Norway. Licence: CC BY 4.0 / NLOD 2.0.
Month-by-month climate: NASA POWER — Climatology (MERRA-2, 2001–2020) — The data was obtained from National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project — Climatology API v2. Dados públicos da NASA, citação obrigatória.
Cities, coordinates and population: Dados de cidades: GeoNames (CC BY 4.0)

The page fetches fresh data every 30 minutes. Informational content. For severe weather warnings, follow your country’s official weather service and civil protection authority.