Temperatures in September
It's pleasantly warm in September in San Mateo with an average temperature of 21°C. Temperatures this month range from a low of 20°C to a high of 22°C. At night, you can expect temperatures between 14°C and 16°C.
Max and Min Temperatures per Day
This chart shows the daily maximum and minimum temperatures in degrees Celsius for San Mateo in September. The red line indicates the max temperatures, and the blue line shows the minimums.
Start of September
The month of September starts in San Mateo with mild temperatures, averaging around 21°C during the day and nights close to 15°C. You won’t see any precipitation in the first days of the month, it’s all sunny skies.
Mid-September
By mid-September, the average daytime temperature stays the same at 21°C, with nights close to 15°C. No precipitation expected during this period, so you can enjoy plenty of sunshine.
End of September
By the end of September, the average daytime temperature in San Mateo will be around 21°C, with nights close to 15°C. No precipitation expected, with plenty of sunshine on the horizon.
Precipitation in September
According to weather history, there is only 3 mm of precipitation in September. The wind speed is around 4 Bft, mostly coming from the Southwest.
The average chance of precipitation is only 6% in September.
Precipitation Chance
This chart shows the daily precipitation chance (in percentages) in September for San Mateo. 0% means it never rained on that day in the past 10 years, and 100% means it rained every day. All values in between represent the average chance of precipitation on that day.
San Mateo in September |
London | ||
|---|---|---|---|
 Average Temperature |
21°C | 20°C | |
 High Temp |
22°C | 22°C | |
| Low Temp |
20°C | 17°C | |
 Total Precipitation |
3 mm | 44 mm | |
| Rainy Days |
2 days | 8 days | |
August
UV index
The UV index is a maximum of 10 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 Mateo?
Want nice weather? Then September is a great time to be in San Mateo. You’ll have pleasant temperatures and little chance of rain this month.
Temperature records for San Mateo in September
With 29°C, San Mateo hit the highest temperature in the last 10 years in September 2018. The lowest daytime temperature in this month was 17°C in 2022. The extreme night temperatures ranged from a low of 10°C to a high of 19°C.
Check out the climate of San Mateo for all months and discover the best travel time
Curious about the climate in other parts of Peru? Check out the weather and climate in places like Lima, Cusco, Machu Picchu, or have a look at other destinations in Peru.
Daily Temperature in September in San Mateo
This chart shows the average daily temperatures, both day and night, for each day in September in San Mateo, measured in degrees Celsius. The red line represents the maximum temperatures, while the blue line shows the minimums. The days of the month are displayed at the bottom of the chart. The data, based on historical observations, gives an overview of the average daily temperatures during this month.
Daily Precipitation in September in San Mateo
The chart below shows the average daily precipitation in September for San Mateo, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail. The days of the month are shown 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 rain is more likely. But it’s still an average, so each day can be different. Based on historical weather data for September, you can expect around 2 days of rain in San Mateo.
Daily UV Index in September in San Mateo
This chart shows the average daily UV index in September in San Mateo, 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 Mateo Over the Years
This chart shows the average temperature in September in San Mateo, measured in degrees Celsius, over the past years.
Total Precipitation in September in San Mateo Over the Years
This chart shows the average precipitation in September in San Mateo, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail.
Daily climate in September for San Mateo
Click on a specific day in September for detailed info on the typical weather on that day in San Mateo. Check out the historical temperatures and precipitation over the past 10 years on this day.
Weather experiences in September in San Mateo
Have you been to San Mateo in September?
Share your weather experience in September in San Mateo.
Average Weather in San Mateo by Month
Click on a month below to see detailed weather info for San Mateo. 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 Mateo for all months at once
