Weather in Santiago for September 2026
So far, September 2026 in Santiago is slightly warmer than the historical average by 0.7 °C.
Expect cooler weather in the next days in Santiago with the forecast suggesting a temperature of 19.9 °C, lower than the historical average.
In general, the average temperature in Santiago at the beginning of September is 16 °C. As the month progressed, temperatures tended to significantly warm up, reaching an average of 22.6 °C by the end of September.
Santiago experiences moderate rainfall in September, with an average of 6 rainy days and a total precipitation of 64.6 mm.
Temperatures
Rain 🌧️
Santiago Weather September
Temperatures trend during September in Santiago
September weather in Santiago day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Overcast | 18° /7° | 0.4 mm | 4 | |
| 2 Sept. |  Light rain shower | 15° /5° | 4.2 mm | 4 | |
| 3 Sept. |  Light rain | 13° /5° | 1.1 mm | 4 | |
| 4 Sept. |  Sunny | 16° /6° | 1.3 mm | 5 | |
| 5 Sept. | Overcast | 18° /7° | 0.1 mm | 5 | |
| 6 Sept. | Sunny | 17° /6° | 13.8 mm | 5 | |
| 7 Sept. | Sunny | 15° /4° | 1.1 mm | 4 | |
| 8 Sept. | Patchy rain possible | 15° /6° | 0.3 mm | 4 | |
| 9 Sept. | Light rain shower | 17° /6° | 0.7 mm | 5 | |
| 10 Sept. | Patchy rain possible | 16° /6° | 1.7 mm | 4 | |
| 11 Sept. | Sunny | 16° /6° | 16.1 mm | 4 | |
| 12 Sept. |  Thundery outbreaks possible | 17° /4° | 0.2 mm | 5 | |
| 13 Sept. | Overcast | 17° /6° | 0.2 mm | 5 | |
| 14 Sept. |  Partly cloudy | 19° /8° | 0 mm | 6 | |
| 15 Sept. | Sunny | 22° /10° | 0 mm | 6 | |
| 16 Sept. | Overcast | 22° /11° | 0 mm | 6 | |
| 17 Sept. | Overcast | 19° /10° | 0.1 mm | 4 | |
| 18 Sept. | Sunny | 19° /8° | 0.4 mm | 5 | |
| 19 Sept. | Overcast | 19° /11° | 9.4 mm | 5.8 | |
| 20 Sept. | Overcast | 18° /9° | 2.6 mm | 7 | |
| 21 Sept. | Overcast | 18° /10° | 0 mm | 6.9 | |
| 22 Sept. |  Smoky haze | 19° /13° | 0.1 mm | 5 | |
| 23 Sept. | Overcast | 20° /13° | 0.2 mm | 5 | |
| 24 Sept. | Overcast | 20° /15° | 0 mm | 6 | |
| 25 Sept. | Overcast | 22° /15° | 0 mm | 6 | |
| 26 Sept. | Partly cloudy | 23° /13° | 0 mm | 7 | |
| 27 Sept. | Sunny | 24° /13° | 0 mm | 7 | |
| 28 Sept. | Overcast | 24° /14° | 0 mm | 6 | |
| 29 Sept. | Overcast | 23° /14° | 0.9 mm | 6 | |
| 30 Sept. | Sunny | 22° /13° | 1.5 mm | 7 | |
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Santiago in September - FAQ
What are the expected maximum and minimum temperatures in Santiago during September?
How much rainfall should be expected in Santiago during September?
What are the typical wind conditions in Santiago during September?
Santiago water temperatures in September
The average water temperature of the Pacific Ocean near Santiago in September is 12.5 °C. At the beginning of September temperatures are around 12.6 °C; by the end of the month they get a bit cooler and reach 11.9 °C.
- What is the water temperature in Santiago in September?
- The average water temperature in Santiago in September is 12.5 °C.
- Can you swim in Santiago in September?
- Cold enough that you lose heat fast. A full 4–5 mm wetsuit (plus hood/gloves for comfort) is advisable for anything beyond a brief plunge.
September rainfall patterns in Santiago
UV exposure in Santiago during September
Quick links
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