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September Weather in San Martin, United States

Last updated: June 24, 2025

In San Martin, United States, the average temperature in September is a pleasant 19°C (67°F). While you can expect minimum temperatures to dip as low as 7°C (45°F), it’s possible for highs to reach an impressive 39°C (102°F). Rain is rarely a concern, with just 2 mm (0.1 in) of precipitation over 0 days and an average humidity of 55%. Enjoy the warmth!

September Temperature in San Martin

In September in San Martin, the average temperature is 19°C (67°F). The maximum can reach 39°C (102°F), while the minimum can drop as low as 7°C (45°F). Be sure to pack accordingly to enjoy a comfortable trip!

September Weather in San Martin: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in San Martin, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Martin, September typically has an average temperature of 19°C (67°F), with highs reaching up to 39°C (102°F) and lows dropping to around 7°C (45°F).
JanFebMarAprMayJunJulAugSepOctNovDec505153576065676867625550
Data source: Temperature data for San Martin generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in San Martin

In San Martin in September, the precipitation amount is 2 mm (0.1 in) during a span of 0 days.

September Precipitation Trends in San Martin

The chart displays monthly precipitation patterns in San Martin, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In San Martin, September typically receives around 2 mm (0.1 inches) of precipitation spread over approximately 0 days.
JanFebMarAprMayJunJulAugSepOctNovDec103797326151112173079
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in San Martin

In San Martin in September, humidity is 55%. With an average temperature of 19°C (67°F), this humidity feels like a refreshing embrace, perfect for leisurely strolls and outdoor adventures.

September Average Humidity in San Martin

This chart illustrates the average monthly humidity levels in San Martin, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in San Martin is approximately 55%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%84%82%78%71%64%59%54%55%62%78%80%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in San Martin

In San Martin in September, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in San Martin.

Maximum UV Index Levels in San Martin for September

The chart shows the monthly maximum UV Index (UVI) for San Martin in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in San Martin typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec4589111111109753
Data source: San Martin September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How September Weather in San Martin Compares to Other Months

Weather in San Martin varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in San Martin, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in San Martin, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather10°C (50°F)103 mm (4.0 inches)82%moderate
February Weather11°C (52°F)79 mm (3.1 inches)84%moderate
March Weather12°C (53°F)73 mm (2.9 inches)82%very high
April Weather14°C (57°F)26 mm (1.0 inches)78%very high
May Weather15°C (60°F)15 mm (0.6 inches)71%extreme
June Weather18°C (65°F)1 mm (0.0 inches)64%extreme
July Weather19°C (67°F)1 mm (0.0 inches)58%extreme
August Weather20°C (68°F)1 mm (0.0 inches)54%very high
September Weather19°C (67°F)2 mm (0.1 inches)55%very high
October Weather17°C (62°F)17 mm (0.7 inches)62%high
November Weather13°C (55°F)30 mm (1.2 inches)78%moderate
December Weather10°C (50°F)79 mm (3.1 inches)80%moderate

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