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Weather in Santiago for September 2025

Your guide to Santiago weather in September - trends and predictions

    Temperatures

  • So far, September 2025 in Santiago is slightly warmer than the historical average by 1 °C.

  • The forecast for the coming days of September 2025 predicts a temperature of 22.1 °C , which is warmer than usual.

  • In general, the average temperature in Santiago at the beginning of September is 15.9 °C. As the month progressed, temperatures tended to significantly warm up, reaching an average of 22.7 °C by the end of September.

    • Rain 🌧️

  • Santiago experiences moderate rainfall in September, with an average of 10 rainy days and a total precipitation of 85.9 mm.

Average dry days
20
Dry days
Average rainy days
10
Rainy days
Average snowy days
0
Snow days
Average temperatures
16°/6°
Temperatures
Average wind speed
11 km/h
Avg max wind
Average humidity
57 %
Avg humidity

Santiago Weather September

Move between months or click on a day
August
October
Mon.Tue.Wed.Thu.Fri.Sat.Sun.
1
Light rain shower
17°
2
Light rain shower
14°
3
Light rain
14°
4
Sunny
18°
5
Overcast
18°
6
Sunny
16°
7
Moderate rain at times
14°
8
Patchy rain possible
15°
9
Light rain shower
18°
10
Patchy rain possible
16°
11
Sunny
17°
12
Thundery outbreaks possible
16°
13
Overcast
15°
14
Partly cloudy
18°
15
Sunny
21°
16
Sunny
25°
17
Sunny
22°
18
Sunny
23°
19
Sunny
21°
20
Patchy rain possible
18°
21
Patchy rain possible
15°
22
Partly cloudy
21°
23
Sunny
25°
24
Sunny
27°
25
Sunny
23°
26
Sunny
24°
27
Sunny
24°
28
Sunny
19°
29
Sunny
23°
30
Sunny
19°

Temperatures trend during September in Santiago

See the weather trend as well as the moving average line

September weather in Santiago day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
1 Sept. Light rain shower
Light rain shower
 17° /6° 0.6 mm 5
2 Sept. Light rain shower
Light rain shower
 14° /3° 5.6 mm 4
3 Sept. Light rain
Light rain
 14° /5° 1.1 mm 4
4 Sept. Sunny
Sunny
 18° /6° 1.7 mm 5
5 Sept. Overcast
Overcast
 18° /7° 0.1 mm 5
6 Sept. Sunny
Sunny
 16° /5° 18.4 mm 5
7 Sept. Moderate rain at times
Moderate rain at times
 14° /3° 1.5 mm 4
8 Sept. Patchy rain possible
Patchy rain possible
 15° /5° 0.4 mm 4
9 Sept. Light rain shower
Light rain shower
 18° /7° 0.4 mm 5
10 Sept. Patchy rain possible
Patchy rain possible
 16° /6° 1.5 mm 5
11 Sept. Sunny
Sunny
 17° /6° 19.3 mm 5
12 Sept. Thundery outbreaks possible
Thundery outbreaks possible
 16° /4° 0.2 mm 5
13 Sept. Overcast
Overcast
 15° /5° 0.2 mm 5
14 Sept. Partly cloudy
Partly cloudy
 18° /8° 0 mm 6
15 Sept. Sunny
Sunny
 21° /10° 0 mm 6
16 Sept. Sunny
Sunny
 25° /10° 0 mm 1.8
17 Sept. Sunny
Sunny
 22° /10° 0 mm 1.6
18 Sept. Sunny
Sunny
 23° /9° 0 mm 1.8
19 Sept. Sunny
Sunny
 21° /8° 0 mm 1.8
20 Sept. Patchy rain possible
Patchy rain possible
 18° /9° 4.7 mm 0.1
21 Sept. Patchy rain possible
Patchy rain possible
 15° /8° 3 mm 4
22 Sept. Partly cloudy
Partly cloudy
 21° /5° 0 mm 5
23 Sept. Sunny
Sunny
 25° /8° 0 mm 6
24 Sept. Sunny
Sunny
 27° /11° 0 mm 6
25 Sept. Sunny
Sunny
 23° /12° 0 mm 6
26 Sept. Sunny
Sunny
 24° /9° 0 mm 6
27 Sept. Sunny
Sunny
 24° /10° 0 mm 6
28 Sept. Sunny
Sunny
 19° /11° 0 mm 5
29 Sept. Sunny
Sunny
 23° /8° 0 mm 6
30 Sept. Sunny
Sunny
 19° /9° 0.4 mm 6
Next
Important Notice
Our weather forecast for Santiago in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Santiago forecast closer to your planned date for the most up-to-date weather information.
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Santiago in September - FAQ

What are the expected maximum and minimum temperatures in Santiago during September?
Enjoy moderate daytime temperatures of up to 16° and cooler nights around 6°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Santiago during September?
Moderate rainfall is anticipated in Santiago during September, with a total of 85.9 mm spread over approximately 10 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Santiago during September?
The average wind speed in Santiago during September is 11 km/h, suggesting breezy to windy conditions, depending on your activities.

Santiago water temperatures in September

The average water temperature of the Pacific Ocean near Santiago in September is 11.3 °C. Temperatures remain fairly consistent throughout the month.

What is the water temperature in Santiago in September?
The average water temperature in Santiago in September is 11.3 °C.
Can you swim in Santiago in September?
Dangerously cold water: hypothermia risk is high. Only experienced cold-water swimmers with proper gear should consider entering.

September rainfall patterns in Santiago

Explore the daily rainfall trends and prepare for Santiagos September weather 💧

UV exposure in Santiago during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️

Quick links

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Location coordinates Where is Santiago?

Get accurate weather forecasts for Santiago, located at latitude -33.457 and longitude -70.648. Stay updated with localized weather information tailored for Santiago.

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