Today
Sun, Jun 21
Slight rain
21°15°
- Rain chance
- 40%
- Precip
- 5.4 mm
- Max wind
- 20 km/h
Longueuil weather forecast
Quebec, Canada · Toronto time · 45.52°, -73.47°
Current conditions · 11:00 AM local
Current conditions in Longueuil
19°C
Partly cloudy
Feels like 19°C
- Humidity
- 83%
- Wind
- 13 km/h SW
- Gusts
- 22 km/h
- UV index
- 4.15
- Visibility
- 17.1 km
Right now
Longueuil is currently seeing partly cloudy, with 19 °C on the thermometer. It feels close to the actual reading at 19 °C. Wind is from the SW at 13 km/h. Humidity stands at 83% with sea-level pressure near 1010 hPa.
At a glance
Today
21° / 15°Slight rain · 40% chance of rain
Tomorrow
25° / 15°Dense drizzle · 37% chance of rain
Upcoming · to Saturday
26° / 14°Highs 26°, lows 14°. The most active day looks like Friday, when rain chances peak at 77%.
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Next 3 days
Today looks like slight rain; temperatures run from 15 °C up to 21 °C. Rain chance peaks at 40% with around 5.4 mm possible. Tomorrow brings dense drizzle with a high of 25 °C and a low of 15 °C. Rain chance peaks at 37% with around 2.6 mm possible. Expect moderate drizzle Tuesday, between 16 °C and 25 °C. Rain chance peaks at 37% with around 1.6 mm possible.
Tomorrow
Mon, Jun 22
Dense drizzle
25°15°
- Rain chance
- 37%
- Precip
- 2.6 mm
- Max wind
- 20 km/h
Tuesday
Tue, Jun 23
Moderate drizzle
25°16°
- Rain chance
- 37%
- Precip
- 1.6 mm
- Max wind
- 18 km/h
Next 48 hours
- 12 AM16°20%8 km/h
- 1 AM16°29%6 km/h
- 2 AM16°25%6 km/h
- 3 AM16°19%7 km/h
- 4 AM16°12%9 km/h
- 5 AM15°9%7 km/h
- 6 AM15°7%8 km/h
- 7 AM17°6%12 km/h
- 8 AM17°5%10 km/h
- 9 AM18°4%14 km/h
- 10 AM18°3%13 km/h
- 11 AM19°3%13 km/h
- 12 PM20°6%13 km/h
- 1 PM21°8%14 km/h
- 2 PM21°20%14 km/h
- 3 PM21°30%13 km/h
- 4 PM19°40%20 km/h
- 5 PM18°36%7 km/h
- 6 PM18°31%10 km/h
- 7 PM18°26%5 km/h
- 8 PM17°25%10 km/h
- 9 PM16°25%5 km/h
- 10 PM16°12%8 km/h
- 11 PM16°16%2 km/h
- 12 AM16°6%6 km/h
- 1 AM16°3%2 km/h
- 2 AM16°2%4 km/h
- 3 AM15°2%7 km/h
- 4 AM15°1%7 km/h
- 5 AM15°1%8 km/h
- 6 AM15°1%9 km/h
- 7 AM16°1%12 km/h
- 8 AM18°1%13 km/h
- 9 AM19°1%9 km/h
- 10 AM21°1%6 km/h
- 11 AM22°1%5 km/h
- 12 PM23°1%7 km/h
- 1 PM24°2%8 km/h
- 2 PM25°4%8 km/h
- 3 PM25°8%10 km/h
- 4 PM25°10%11 km/h
- 5 PM25°21%13 km/h
- 6 PM22°21%20 km/h
- 7 PM20°22%13 km/h
- 8 PM19°24%17 km/h
- 9 PM17°30%15 km/h
- 10 PM17°17%10 km/h
- 11 PM16°37%8 km/h
In depth
Longueuil starts the period under partly cloudy, with the mercury at 19 °C and a feels-like of 19 °C. Today's forecast calls for slight rain, topping out near 21 °C before falling back to 15 °C overnight. Winds blow mainly from the WSW around 20 km/h, with gusts up to 31 km/h. Daytime highs hold fairly steady this week, staying within 21 to 26 °C. Rain is in the picture on today, tomorrow, Tuesday and beyond, with roughly 18 mm expected in total across the week. Tomorrow brings dense drizzle with a high of 25 °C and a 37% chance of precipitation. The UV index reaches 6 today, so sun protection is sensible during the middle of the day. Sunrise comes at 05:05 and sunset at 20:46, giving 15.7 hours of daylight. Current humidity sits at 83% with pressure near 1010 hPa. Looking further out, Thursday shows slight rain showers with a high around 26 °C, while Saturday ends the week at 24 °C. Forecast details are refreshed throughout the day as new model runs arrive, so check back for the latest figures.
Air quality
37
Good
US AQI · European AQI 27
Air quality in Longueuil is currently good, with a US AQI of 37 (European AQI 27). The dominant pollutant right now is ozone. Air quality is healthy; no precautions needed. Fine particulate matter (PM2.5) measures 6.4 µg/m³.
Pollutants
- PM2.5
- 6.4 µg/m³
- PM10
- 6.6 µg/m³
- Ozone (O₃)
- 68 µg/m³
- NO₂
- 3.8 µg/m³
- SO₂
- 3 µg/m³
- CO
- 142 µg/m³
- Dust
- 0 µg/m³
Sun & UV
- Sunrise
- 5:05 AM
- Sunset
- 8:46 PM
- Daylight
- 15h 41m
- Max UV
- 6.45 High
Wind
- Wind
- 13 km/h
- Gusts
- 22 km/h
- Direction
- SW (235°)
Farming weather
Soil temperatures today read surface 19.2 °C, 6 cm 18.5 °C, 18 cm 18.5 °C, 54 cm 16 °C. Soil moisture sits at 0-1 cm at 0.47 m³/m³, 3-9 cm at 0.47 m³/m³, 27-81 cm at 0.48 m³/m³. For wheat, the root-zone reading is above the ideal 0.2-0.35 m³/m³ band. ET0 of 26 mm modestly outpaces the 18 mm of forecast rain; light supplemental irrigation may help. A suitable spraying window opens around 06:00 on 2026-06-21, with winds at or below 15 km/h and no rain expected. Projected growing degree days over the next week: wheat 106, maize 67.
- Topsoil moisture
- 0.469 m³/m³
- Soil temp
- 19°C
- ET₀ today
- 2.1 mm
- Spray window
- ~5:00
- Rain (next 7d)
- 18.1 mm
- Wind
- 13 km/h
- Humidity
- 83%
Advisory summary
No weather alert thresholds are crossed for Longueuil in the current forecast (derived from forecast data, not official warnings). Conditions may still change — check back for updates.
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All data for Longueuil
| Variable | Value |
|---|---|
| City | Longueuil, Quebec, Canada |
| Coordinates | 45.5152, -73.46818 |
| Elevation | 29 m |
| Timezone | America/Toronto |
| Population | 229,330 |
| Observed at (local) | 11:00 AM |
| Temperature (2 m) | 19°C |
| Apparent temperature | 19°C |
| Relative humidity (2 m) | 83% |
| Dew point (2 m) | 16°C |
| Precipitation (last hour) | 0 mm |
| Rain | 0 mm |
| Showers | 0 mm |
| Snowfall | 0 cm |
| Weather code (WMO) | 2 |
| Cloud cover | 75% |
| Surface pressure | 1007 hPa |
| Sea-level pressure | 1010 hPa |
| Wind speed (10 m) | 13 km/h |
| Wind gusts (10 m) | 22 km/h |
| Wind direction (10 m) | 235° (SW) |
| Visibility | 17.1 km |
| UV index | 4.15 |
| Day / night | Day |
| Today max / min | 21°C / 15°C |
| Today feels-like max / min | 21°C / 16°C |
| Today precipitation sum | 5.4 mm |
| Today rain sum | 5.4 mm |
| Today snowfall sum | 0 cm |
| Today max precip probability | 40% |
| Today max wind / gusts | 20 km/h / 31 km/h |
| Dominant wind direction | 243° (WSW) |
| Sunrise / sunset | 5:05 AM / 8:46 PM |
| Daylight duration | 15h 41m |
| Sunshine duration | 3h 31m |
| Max UV index | 6.45 |
| Reference evapotranspiration (ET₀) | 2.1 mm |
| Topsoil moisture (0–1 cm) | 0.469 m³/m³ |
| Surface soil temperature | 19°C |
| US AQI | 37 |
| European AQI | 27 |
| PM2.5 | 6.4 µg/m³ |
| PM10 | 6.6 µg/m³ |
| Ozone (O₃) | 68 µg/m³ |
| Nitrogen dioxide (NO₂) | 3.8 µg/m³ |
| Sulphur dioxide (SO₂) | 3 µg/m³ |
| Carbon monoxide (CO) | 142 µg/m³ |
| Dust | 0 µg/m³ |
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<iframe src="https://weathertomorrow.cloud/embed/city/ca/quebec/longueuil" width="320" height="180" frameborder="0" title="Longueuil weather" loading="lazy"></iframe>Frequently asked questions
Will it rain in Longueuil tomorrow?
There is a moderate chance of rain in Longueuil tomorrow, peaking at 37%.
What is the temperature in Longueuil today?
Today Longueuil sees slight rain with a high of 21 °C and a low of 15 °C.
How hot will it be in Longueuil tomorrow?
Tomorrow's high in Longueuil is forecast at 25 °C with dense drizzle.
Is it windy in Longueuil today?
No, not especially; gusts only reach up to 31 km/h today.
What is the UV index in Longueuil today?
The UV index peaks at 6 today, which is high.
What time is sunrise and sunset in Longueuil today?
The sun rises at 05:05 and sets at 20:46 local time.
Is the air quality in Longueuil good today?
Air quality is good right now, with a US AQI reading of 37.