Thornhill Weather in September

September in Thornhill typically sees daytime highs of 16°C (61°F) and nighttime lows of 9°C (48°F). Rainfall is also possible this month, so it's worth packing an umbrella.

Rainfall in Thornhill in September

Historically, September sees about 19 days of rain, with a monthly average of 101 mm (4 in). Rain falls regularly this month and can be quite heavy when it does. Showers can be substantial, so waterproof gear is a good idea.

Temperature in Thornhill in September

Thornhill in September gets highs of 16°C (61°F) during the day and drops to 9°C (48°F) at night. Even when the weather is stable, mornings and evenings can still feel distinctly cool. At 9°C (48°F) overnight, it gets properly cold after dark. On the bright side, cold nights tend to make for excellent sleeping conditions.

Sunshine in Thornhill in September

The area experiences limited sunny days, amounting to roughly 95 hours of sunshine. This makes it perfect for those who lean towards cooler, cloudier settings rather than intense sunlit days.

Our weather planner can help you find worldwide destinations with pleasant weather during this period. May, July and August typically offer the best weather for Thornhill.