Santiago in September
In September, Santiago averages 20°C (68°F) during the day and 7°C (45°F) at night, with only about 4 rainy days.
High seasonConditions are comfortable for sightseeing without being sweltering. Occasional showers are likely but won't dominate.
September is a great month to visit Santiago: pleasant temperatures and relatively few wet days.
How September compares to the rest of the year in Santiago
September is in the middle of the year for warmth in Santiago (8th of 12) and moderately rainy compared to the rest of the year (5th of 12). Daytime temperature runs 3°C below the annual average (23°C). September runs 3°C warmer than August (17°C) and warms a further 3°C into October (23°C).
September sunrise & sunset in Santiago
Times shown for Santiago local time (America/Santiago), calculated for the 15th of September. They shift by a few minutes day to day across the month.
Photography light in Santiago — September
Golden-hour and blue-hour windows for the 15th of September, in Santiago's local time. Use these for soft warm light (golden) or cool architectural twilight (blue).
📅 When to book — Santiago in September
Travel writers usually only tell you when to go. Here's when to book flights and lodging for the best mix of price and availability, based on September's tier (High season) and Santiago's popularity.
Crowds & pricing — September in Santiago
This is a busy month in Santiago — not the absolute peak, but tourist numbers are clearly elevated. You'll feel it at headline attractions on weekends and in the historic centre, though side streets and lesser-known sights stay manageable. Prices are above off-season but not at their summit. A good week for first-time visitors who want everything open without the worst of the crush.
Why this tier: excellent tourism weather
Sun & mosquito risk — September in Santiago
UV is a clear-sky sea-level estimate — clouds, altitude, and reflective surfaces (snow, water) shift it ±30%. Mosquito risk is climate-derived only; for current disease advisories (dengue, malaria, zika) check the CDC or WHO travel pages before your trip.
Santiago in other months
| Month | Avg high | Avg low | Rainfall | Rain days | Snow days |
|---|---|---|---|---|---|
| January | 30°C / 86°F | 14°C / 57°F | 1 mm | 1 | 0 |
| February | 29°C / 84°F | 13°C / 55°F | 5 mm | 1 | 0 |
| March | 27°C / 81°F | 12°C / 54°F | 5 mm | 2 | 0 |
| April | 23°C / 73°F | 9°C / 48°F | 15 mm | 3 | 0 |
| May | 19°C / 66°F | 7°C / 45°F | 50 mm | 5 | 0 |
| June | 15°C / 59°F | 5°C / 41°F | 80 mm | 7 | 0 |
| July | 15°C / 59°F | 4°C / 39°F | 75 mm | 8 | 0 |
| August | 17°C / 63°F | 5°C / 41°F | 60 mm | 6 | 0 |
| September | 20°C / 68°F | 7°C / 45°F | 35 mm | 4 | 0 |
| October | 23°C / 73°F | 9°C / 48°F | 15 mm | 3 | 0 |
| November | 27°C / 81°F | 11°C / 52°F | 10 mm | 2 | 0 |
| December | 30°C / 86°F | 13°C / 55°F | 5 mm | 1 | 0 |
Other cities with similar September weather
🌍 See the full ranked list of climate twins for Santiago in September →
Frequently asked questions
How hot is Santiago in September?
In September, Santiago averages a high of 20°C (68°F) and a low of 7°C (45°F) — generally mild and pleasant.
Does it rain a lot in Santiago in September?
September is generally dry in Santiago, with about 4 rainy days on average.
Is September a good time to visit Santiago?
September is mild and pleasant and mostly dry. It suits travelers who are comfortable with mild and pleasant weather; check the month-by-month ranking to compare it against the rest of the year.
What should I pack for Santiago in September?
Pack light layers for warm days and cooler evenings. See the full September packing list for Santiago for a complete, climate-based checklist.
Check the live 10-day forecast and sunrise/sunset.