Average weather for San Carlos in September
It's cool to moderate in September in San Carlos with an average temperature of 18°C. Temperatures this month range from a low of 15°C to a high of 20°C. At night, you can expect temperatures between 8°C and 11°C.
Start of September
The month of September starts in San Carlos with cool temps, averaging around 17°C during the day and nights around 10°C. There are plenty of days with a good chance of precipitation.
Mid September
By mid-September, daytime temps rise to around 18°C, with nights around 10°C. There’s a chance of some showers during this time, but plenty of dry and sunny days too.
End of September
By the end of September, the average daytime temperature in San Carlos is around 19°C, while nighttime temps are about 11°C. A shower might pop up, but overall, the weather will be dry and sunny.
In September, there is an average of 118 mm of precipitation, spread over 8 days. The wind speed is around 5 Bft, mostly coming from the Southeast.
San Carlos in September |
New York | ||
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18°C | 27°C | |
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20°C | 31°C | |
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15°C | -5°C | |
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118 mm | 57 mm | |
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8 days | 9 days |
UV index
The UV index is a maximum of 8 this month. That's a very high value on the intensity scale of 1 to 11. Unprotected skin can burn within 10-15 minutes.
Is September a good time to visit San Carlos?
Looking for sun? September isn’t a good month to be in San Carlos. The temperature is nice, but there’s too much chance of rain.
Temperature records
With 30°C in 2018, San Carlos reached the highest temperature in September over the past 10 years. The lowest daytime temperature in this month was 9°C in 2019. The extreme nighttime temperatures ranged from a lowest recorded value of 2°C to a highest value of 17°C.
Check out the climate of San Carlos for all months and discover the best travel time
Daily Temperature in September in San Carlos
This chart shows the average daily high and low temperatures in September for San Carlos, in degrees Celsius. The red line represents the highs, and the blue line shows the lows. The days of the month are displayed at the bottom of the chart. The data, based on historical observations, provide the average temperatures for this month.
Daily Precipitation in September in San Carlos
The chart below shows the average daily precipitation in September for San Carlos, measured in millimeters over the past few years. Precipitation is always measured as water, even if it’s snow or hail. The days of the month are listed at the bottom of the chart.
A low average precipitation means that the chance of rain on that day is usually small, while a higher average suggests that it rained more often. But remember, it’s just an average, and every day can be different. Based on historical weather data for September, you can expect about 8 days of precipitation in San Carlos.
Daily UV index in September in San Carlos
This chart shows the average daily UV index in September in San Carlos, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.
Temperature in September in San Carlos over the years
This chart shows the average temperature in September in San Carlos, measured in degrees Celsius, over the past few years.
Total precipitation in September in San Carlos over the years
This chart shows the average precipitation in September in San Carlos, measured in millimeters over the past years. Precipitation is always measured as water, whether it’s snow or hail.
Daily weather in September for San Carlos
Click on any day in September to get detailed info about the usual weather on that day in San Carlos. Check out the historical temperatures and precipitation over the past 10 years on this day.






























Weather experiences in September in San Carlos
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Average weather in San Carlos by month
Click on a month below to see detailed weather info for San Carlos. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.
Or check out the climate of San Carlos for all months at once