Weather in Lake Forest in September
Lake Forest, United States averages a high of 27°C (80.6°F) and low of 17.7°C (63.9°F) in September, with 1 rain days and 11.6 hours of daily sunshine. Travel score: 94.9/100 (Excellent). The best time to visit Lake Forest is August.
High
27°C81°F
Low
18°C64°F
🌧️
1
rain days
☀️
11.6
hrs/day sunshine
💧
72%
humidity
95— Excellent
September in Lake Forest is warm and dry — ideal for sightseeing and outdoor activities.
What are the average temperatures in Lake Forest?
How much does it rain in Lake Forest in September?
Lake Forest receives an average of 6.4mm of rainfall across 1 rainy days in September. The annual total is 357.4mm.
What should I pack for Lake Forest in September?
Essentials
👟
Comfortable walking shoes
Essential for exploring the city
👕
Light layers and t-shirts
Warm weather around 27°C
🧴
Sunscreen SPF 30+
12 hours of sunshine daily
🕶️
Sunglasses
Protect your eyes from bright sun
🎉Visiting United States in September?
Don't miss any public holidays — check before you book!
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Data based on 1994–2024 averages · Last updated: 2024-12-31