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Weather in San Juan for September 2027

Your guide to San Juan weather in September - trends and predictions

    Temperatures

  • In general, the average temperature in San Juan at the beginning of September is 31.2 °C. As the month progressed, temperatures tended to slightly decrease, reaching an average of 31 °C by the end of September.

    • Rain 🌧️

  • San Juan in September brings notable rainfall, with an average of 16 rainy days and a total precipitation of 190.5 mm.

    • More

  • Is September a good time to visit San Juan? check out the best time to travel to San Juan page.

Average dry days
14
Dry days
Average rainy days
16
Rainy days
Average snowy days
0
Snow days
Average temperatures
31°/26°
Temperatures
Average wind speed
22 km/h
Avg max wind
Average humidity
77 %
Avg humidity

San Juan Weather September

Move between months or click on a day
August
October
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Light rain
31°
2
Light rain
31°
3
Patchy rain possible
32°
4
Partly cloudy
32°
5
Light rain
31°
6
Overcast
32°
7
Heavy rain at times
31°
8
Light rain
30°
9
Light rain
31°
10
Light rain
31°
11
Light rain
31°
12
Patchy rain possible
32°
13
Patchy rain possible
31°
14
Light rain
32°
15
Light rain
32°
16
Light rain
32°
17
Thundery outbreaks possible
30°
18
Patchy rain possible
30°
19
Patchy rain possible
31°
20
Moderate rain
32°
21
Moderate rain
31°
22
Patchy rain possible
31°
23
Moderate rain
31°
24
Light rain
31°
25
Moderate rain
31°
26
Moderate rain
31°
27
Patchy rain possible
30°
28
Patchy rain possible
32°
29
Patchy rain possible
31°
30
Patchy rain possible
32°

Temperatures trend during September in San Juan

See the weather trend as well as the moving average line

September weather in San Juan day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
1 Sept. Light rain
Light rain
 31° /26° 4.2 mm 8
2 Sept. Light rain
Light rain
 31° /26° 2.6 mm 7
3 Sept. Patchy rain possible
Patchy rain possible
 32° /26° 0.7 mm 9
4 Sept. Partly cloudy
Partly cloudy
 32° /26° 0.6 mm 7
5 Sept. Light rain
Light rain
 31° /26° 5.2 mm 6
6 Sept. Overcast
Overcast
 32° /26° 0.8 mm 6
7 Sept. Heavy rain at times
Heavy rain at times
 31° /26° 11.2 mm 7
8 Sept. Light rain
Light rain
 30° /26° 4.4 mm 7
9 Sept. Light rain
Light rain
 31° /26° 7.4 mm 7
10 Sept. Light rain
Light rain
 31° /25° 7.8 mm 6
11 Sept. Light rain
Light rain
 31° /26° 3.2 mm 6
12 Sept. Patchy rain possible
Patchy rain possible
 32° /26° 1 mm 7
13 Sept. Patchy rain possible
Patchy rain possible
 31° /26° 1.7 mm 7
14 Sept. Light rain
Light rain
 32° /26° 4.8 mm 6
15 Sept. Light rain
Light rain
 32° /26° 4.7 mm 6
16 Sept. Light rain
Light rain
 32° /26° 3.8 mm 6
17 Sept. Thundery outbreaks possible
Thundery outbreaks possible
 30° /26° 13.8 mm 6
18 Sept. Patchy rain possible
Patchy rain possible
 30° /26° 2.3 mm 6
19 Sept. Patchy rain possible
Patchy rain possible
 31° /26° 2.2 mm 6
20 Sept. Moderate rain
Moderate rain
 32° /26° 22.2 mm 6
21 Sept. Moderate rain
Moderate rain
 31° /25° 23.5 mm 6
22 Sept. Patchy rain possible
Patchy rain possible
 31° /26° 0.9 mm 7
23 Sept. Moderate rain
Moderate rain
 31° /26° 11.9 mm 8
24 Sept. Light rain
Light rain
 31° /26° 3.1 mm 8
25 Sept. Moderate rain
Moderate rain
 31° /26° 24.8 mm 8
26 Sept. Moderate rain
Moderate rain
 31° /26° 15.3 mm 8
27 Sept. Patchy rain possible
Patchy rain possible
 30° /26° 1.7 mm 6
28 Sept. Patchy rain possible
Patchy rain possible
 32° /25° 1.7 mm 6
29 Sept. Patchy rain possible
Patchy rain possible
 31° /26° 1.7 mm 7
30 Sept. Patchy rain possible
Patchy rain possible
 32° /26° 1.2 mm 6
Next
Important Notice
Our weather forecast for San Juan 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 San Juan forecast closer to your planned date for the most up-to-date weather information.
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San Juan in September - FAQ

What are the expected maximum and minimum temperatures in San Juan during September?
During September, expect a variety of temperatures with highs around 31° and lows near 26°, suitable for diverse activities and preferences.

How much rainfall should be expected in San Juan during September?
Significant rainfall exceeding 190.5 mm is expected in San Juan during September, occurring over more than 16 days. Preparing for wet conditions is recommended in your planning.

What are the typical wind conditions in San Juan during September?
The average wind speed in San Juan during September is 22 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in San Juan

Explore the daily rainfall trends and prepare for San Juans September weather 💧
Typically, San Juan has 16 rainy days in September with a total of 190.5 mm of rainfall.

UV exposure in San Juan during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
Provinces in San Juan
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San Juan Antiguo Barrio
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Location coordinates Where is San Juan?

Get accurate weather forecasts for San Juan, located at latitude 18.466 and longitude -66.106. Stay updated with localized weather information tailored for San Juan.

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