Fort Simpson (NT) Temperature by Month

The average annual maximum temperature in Fort Simpson, Northwest Territories, Canada is 4°C (39°F), with daytime highs ranging from -19°C (-2°F) in January to 25°C (77°F) in July. This page covers monthly averages, day-night differences, and how Fort Simpson compares to cities worldwide.

Depending on the time of the year, temperatures range from comfortable to very cold in Fort Simpson. At night, minimum temperatures range from 12°C (54°F) in July to -27°C (-17°F) in January.

The chart below illustrates the average maximum day and minimum night temperatures in Fort Simpson by month:

The minimum temperature is often recorded between 4 AM and 6 AM, while the highest temperature is usually reached at 3 PM, when the sun's heating effect is strongest. July, the warmest month, gets 308 hours of sunshine.

The chart below shows the average temperature throughout the year:

Fort Simpson's average annual maximum temperature is 4°C (39°F). To put that in context, here's how it compares to a few well-known destinations:

Athens, Greece sits at 23°C (73°F) on average, with hot dry summers and mild winters characteristic of the Mediterranean.

Interlaken, Switzerland averages 8°C (46°F) a year, with cold winters and cool summers thanks to its Alpine setting.

Seoul, South Korea averages 18°C (64°F) a year, with four clear seasons, cold winters, and hot humid summers.

Perth, Australia averages 25°C (77°F) annually, with a classic Mediterranean climate, hot dry summers and mild wet winters.

Temperature alone doesn't tell the whole story, humidity plays a big role in how warm or cold it actually feels. High humidity in summer makes the heat feel more intense, particularly once temperatures climb above 25°C. In winter, the same humidity can make cold air feel sharper than the thermometer suggests.

In the cooler months, when temperatures drop below 10°C, high humidity makes the cold feel more cutting than it would in dry conditions.

In Fort Simpson, January is the coolest month, with average highs of -19°C (-2°F) and humidity around 78%, considered high. In July, the warmest month, temperatures average 25°C (77°F) with 51% humidity, conditions that feel moderate. For a full picture, see our humidity page.

Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.

The readings come from a range of sources, land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.

Whether a city sits on the coast or deep inland makes a significant difference to its climate. Coastal areas tend to have more stable temperatures year-round, large bodies of water absorb heat slowly in summer and release it gradually in winter, keeping extremes in check. Cities far from the sea don't benefit from that buffer, which is why continental climates tend to have hotter summers and colder winters than their coastal counterparts at the same latitude.

For more on Fort Simpson's weather, including monthly rainfall, sunshine hours, and humidity, visit our Fort Simpson climate page.