Weather in Hillsboro in September
Hillsboro, United States averages a high of 23.7°C (74.7°F) and low of 12°C (53.6°F) in September, with 6 rain days and 10.5 hours of daily sunshine. Travel score: 87.3/100 (Excellent). The best time to visit Hillsboro is July.
High
24°C75°F
Low
12°C54°F
🌧️
6
rain days
☀️
10.5
hrs/day sunshine
💧
66%
humidity
87— Excellent
September in Hillsboro is warm and mostly dry — ideal for sightseeing and outdoor activities.
What are the average temperatures in Hillsboro?
How much does it rain in Hillsboro in September?
Hillsboro receives an average of 44.2mm of rainfall across 6 rainy days in September. The annual total is 1221.3mm.
What should I pack for Hillsboro in September?
Essentials
👟
Comfortable walking shoes
Essential for exploring the city
👕
Light layers and t-shirts
Warm weather around 24°C
🧴
Sunscreen SPF 30+
11 hours of sunshine daily
🕶️
Sunglasses
Protect your eyes from bright sun
Traveling to United States in September?
Don't let a public holiday surprise you — restaurants, shops, and attractions may be closed.
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Data based on 1994–2024 averages · Last updated: 2024-12-31