Dease Lake Weather in September

Dease Lake in September sees low temperatures, with highs around 11°C (52°F) and overnight lows of 2°C (36°F). Rainfall is fairly high at around 89 mm (3.5 in) on average, so pack waterproofs just in case.

Rainfall in Dease Lake in September

Looking at the last 30 years, the data shows about 16 days with rain, averaging 89 mm (3.5 in) for the month. Rain this month is fairly typical, a standard mix of wet and dry days with no particularly heavy or persistent showers.

Temperature in Dease Lake in September

September in Dease Lake brings low temperatures, with highs of 11°C (52°F) and nights around 2°C (36°F). Cold conditions persist throughout the day, so warm clothing is important from the moment you head outside. With lows around 2°C (36°F), nights are cold. The upside is that cool, crisp nights are often the best for a deep sleep.

Sunshine in Dease Lake in September

With about 116 hours of sunshine, the area enjoys a nice balance of sun and overcast, creating a pleasant environment.

Wind Speed in Dease Lake in September

Average wind conditions reach 1 m/s (2 knots) in September. This creates generally peaceful weather with subtle air movement. Remember this is an average: some days are windless while others have noticeable or very gentle breezes.

For Dease Lake itself, June, July and August generally stand out with the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.

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For a detailed overview over the year and the best time to visit Canada, check out our Dease Lake's climate page.

Dease Lake Temperature in September

Min Temperature 2°C (36°F)  

Max Temperature 11°C (52°F)  

Chance of Rain 52%  

Precipitation 89 mm (3.5 in)  

Rainy days 16 days  

Windspeed 1 m/s (2 knots)  

Sunshine 116 hours  

Percentage Sunshine 30%  

Daily Historical Temperatures

48-year average (1976-2025)

Based on our historical records, temperatures in Dease Lake typically drop from around 14°C (57°F) at the start of September to approximately 10°C (50°F) by the end. Nights are cold, with lows typically ranging from 0°C (32°F) to 5°C (41°F).

Average temperatures in September

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Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

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Daily Historical Precipitation

48-year average (1976-2025)

Average daily rainfall for each day of the month based on long-term records.

Average precipitation in September

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Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

‹ January February March April May June July August September October November December ›

Historical weather for Dease Lake in September

Browse day-by-day weather records for Dease Lake spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.

Historical weather Temperatures Precipitation

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‹ January February March April May June July August September October November December ›

Dease Lake historical weather extremes in September

According to our 27 years of weather records for Dease Lake, the following extremes were recorded between 1998 and 2025.

• Dease Lake recorded its highest September temperature of 27°C (81°F) on September 5, 2017.
• On September 30, 2000, Dease Lake saw its coldest September day with temperatures maxing out at 0°C (32°F).
• The coldest night in September in Dease Lake was on September 22, 2018, with a minimum of -8°C (18°F).

What to Wear in Dease Lake in September

Pack for changing conditions in Dease Lake in September. Bring a mix of short and long sleeves, a warm layer like a hoodie or light jacket, and comfortable pants. The key is being able to add or remove layers as the days goes by. Prepare for significant rainfall with proper waterproof clothing and shoes. Sunglasses could come in handy during the sunnier parts of your trip.

What To Do in Dease Lake in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

5/10

Cycling

6/10

Walking

6/10

Camping

4/10

Outdoor sports

6/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit Canada, check out our Dease Lake's climate page.

More climate data for Dease Lake

Temperature Rainfall Sunshine Wind Speed

See the full Dease Lake climate overview or explore weather in Canada.