Climate Insights for Lethbridge

The climate in Lethbridge is cool. The average annual temperature is 7°C and approximately 403mm of precipitation falls per year. June is the wettest month, receiving around 59mm of rainfall. Lethbridge is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: August, July, June. The coldest months are February, January, December, when temperatures can drop to -10°C. Light snow can occur between January and November.

Lethbridge has a wide annual temperature range, spanning 38°C from the coldest to warmest months. The warmest month is August, when average highs reach 28°C and the mean temperature sits around 20°C. The coldest month is February, when overnight lows fall to -10°C and the daily average is -6°C. On average, daily temperatures fluctuate by about 12°C between overnight lows and afternoon highs. The sharpest temperature change occurs between September and October, with a 7°C shift in average temperatures.

Lethbridge is a relatively dry area, receiving approximately 403mm of precipitation annually, which averages out to around 34mm per month. The wettest month is June, averaging 59mm of rainfall. May and July also tend to see above-average precipitation. The driest month is January, with just 16mm. That's 43mm less than June, the wettest month. Precipitation varies noticeably between seasons, with the first half (January to June) of the year generally seeing more rainfall. Light snowfall can occur between January and November, totalling around 6cm annually. November is the snowiest month with approximately 2cm.

Lethbridge is relatively calm, with an average annual wind speed of 5km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is November, averaging 6km/h, though still comfortable for most outdoor activities. The calmest conditions occur in July, with average winds dropping to 4km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 2km/h gap between the calmest and windiest months.

It is currently spring in Lethbridge, which began on March 20, 2026. Lethbridge is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in August at around 28°C, while the coldest stretch bottoms out in February near -10°C. Summer is next, beginning on June 21, 2026 — 10 days from now.

The best time to visit Lethbridge is during June, July, August and September, when the weather is most comfortable for travellers. During these months, average temperatures hover around 18°C with modest rainfall averaging 42mm per month. By contrast, February can be quite cold with temperatures dropping to -10°C. A light rain jacket is recommended, though showers are generally brief and shouldn't disrupt your plans.

The table below shows monthly climate averages for Lethbridge based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Snow is measured in centimetres (cm) and reflects average monthly snowfall accumulation. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.