Santiago in September: weather, rain (19%) and should you go? [2026]

Month summary

Santiago weather in September

✅ Good

🌡️ Temperature min / max

46°F – 66°F

🌧 Rainy days

19% of days

☀️ Sunshine

11.0h per day on average

🌊 🌊 Season

Autumn

⭐ ⭐ Weather score

7.5/10

📅 📅 Best month

December (9.6/10)

Quick decision

Should you visit Santiago in September?

✅ Good

✅ Yes if: you want to explore the city on foot without suffering from heat.

❌ No if: you're looking for a beach destination — water and air are still cool.

🌧 Rain : ██░░░░░░░░ 19%

🌡 Temperature : █████░░░░░ 66°F

☀️ Sunshine : ████████░░ 11.0h/d

Our take: September is spring in Santiago, and it's genuinely lovely—mild days around 19°C with cool mornings, plenty of sunshine, and minimal rain. You'll want layers for that temperature range, but honestly, it's perfect for exploring the city without sweating through summer heat. If you're someone who loves comfortable walking weather and can handle a light jacket, this month hits the sweet spot.

By trip type

Santiago in September by trip type

🏙️ 🏙️ City break / culture : ✅ Good
🚶 🚶 Outdoor activities : ✅ Good
🏖️ Beach / swimming : ❌ Not recommended
💰 💰 Budget : ✅ Low season

Local context

What to expect in September

Autumn in Santiago is often underrated: 19°F, golden light and declining crowds. An interesting window. Rain risk remains low (19% of days), leaving good room for outdoor activities. A good balance between weather and crowds, even if December (9.6/10) remains theoretically better.

Browse by month

All months for Santiago

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Annual table

Month-by-month comparison

Month	Min °F	Max °F	Rain %	Precip in	Sun h/d	Score
☀️ January	61°F	86°F	2%	0.0in	13.8h	9.3/10
☀️ February	61°F	86°F	4%	0.0in	12.7h	9.1/10
☀️ March	57°F	82°F	3%	0.0in	11.9h	9.5/10
🌤️ April	54°F	73°F	7%	0.0in	10.7h	8.4/10
🌤️ May	48°F	64°F	15%	0.1in	9.5h	7.3/10
⛅ June	45°F	59°F	21%	0.1in	8.3h	7.0/10
⛅ July	45°F	59°F	15%	0.1in	9.4h	7.1/10
⛅ August	45°F	61°F	19%	0.1in	10.0h	7.1/10
🌤️ September	46°F	66°F	19%	0.0in	11.0h	7.5/10
🌤️ October	50°F	72°F	15%	0.0in	12.2h	8.4/10
☀️ November	54°F	81°F	6%	0.0in	13.0h	9.5/10
☀️ December	57°F	84°F	3%	0.0in	13.8h	9.6/10

Ideal Fair Challenging climate ◀ Current month · Source Open-Meteo · 10 years

📊 Data source Data based on 10 years of ERA5 records via Open-Meteo, with ECMWF seasonal adjustment. In September, Santiago averages 66°F, 19% rainy days and 11.0h of sunshine per day. Overall weather score: 7.5/10. See methodology →

Comparison