Alert Weather in September
September in Alert sees daytime temperatures around -5°C (23°F) and lows of -11°C (12°F) at night. Pack a rain jacket because some snowfall is likely.
Rainfall in Alert in September
Past climate data indicates that roughly 12 days will see snow, totalling around 26 mm (1 in) for the month. Expect a fairly normal spread of rainfall this month, with no particular pattern of very heavy or very persistent showers.
Temperature in Alert in September
Expect highs of -5°C (23°F) in Alert in September, with nights dropping to around -11°C (12°F). Staying warm is the main priority this month, especially during mornings and evenings. Nights drop below freezing to -11°C (12°F). An extra blanket is worth packing if you're unsure about the heating where you're staying. The month brings very cold weather, so dressing warmly is essential. Prepare with multiple layers for added warmth.
Sunshine in Alert in September
The area enjoys a moderate level of sunlight, with around 111 hours. It's a good balance between sunny and cloudy days.
Wind Speed in Alert in September
Wind speeds average 3 m/s (6 knots) during September. At this speed, light breezes keep leaves and small twigs in gentle motion while the wind also provides natural cooling. Since this is an average, some days are more tranquil while others have more persistent light winds that are more noticeable.September in Alert can still be great, but if you prefer pleasant temperatures along with dry and sunny conditions, our weather planner can help you explore other options in the world.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Canada, check out our Alert's climate page.
Alert Temperature in September
Min Temperature
-11°C (12°F)
Max Temperature
-5°C (23°F)
Chance of Rain
40%
Precipitation
26 mm (1 in)
Rainy days
12 days
Humidity
84%
Windspeed
3 m/s (6 knots)
Sunshine
111 hours
Percentage Sunshine
22%
Daily Historical Temperatures
49-year average (1976-2025)
Based on our historical records, temperatures in Alert typically drop from around -1°C (30°F) at the start of September to approximately -10°C (14°F) by the end. Nights are very cold, with lows typically ranging from -16°C (3°F) to -4°C (25°F).
Average temperatures in September
Historical weather for Alert in September
Browse day-by-day weather records for Alert spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Alert historical weather extremes in September
Our historical data for Alert spans 1999 to 2025, revealing these weather extremes.
- The warmest day in September was on September 17, 2023, with a maximum of 6°C (43°F).
- The coldest September day was on September 30, 2006, with a maximum of -19°C (-2°F).
- Nighttime temperatures dropped to -24°C (-11°F) on September 30, 2006, marking the coldest September night on record.
Best Places in Canada in September
Find out more about the weather in Canada and which places have the best travel conditions in this month. See all of Canada in September →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in Alert in September
It's wise to bundle up for freezing conditions in Alert in September. If you have a winter jacket with good insulation, waterproof winter boots, thermal layers, and warm accessories it's smart to pack them. Hand and foot warmers can be lifesavers, especially during the night. Light rain is possible, so consider bringing a small umbrella or rain jacket. It won't hurt to bring your sunglasses along, as you'll see some sunny periods.What To Do in Alert in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Canada, check out our Alert's climate page.
Temperature Rainfall Sunshine Humidity Wind Speed
See the full Alert climate overview or explore weather in Canada.
