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September Weather in Merced, United States

Last updated: June 24, 2025

In September, the average temperature in Merced, United States is a warm 26°C (78°F). You may experience a range where the minimum dips to 11°C (51°F) and the maximum can soar up to a sizzling 45°C (114°F). Rain is unlikely; with 0 mm (0.0 in) of precipitation over 0 days, you can expect plenty of sunshine. Average humidity sits at a comfortable 55%, making it an ideal time to enjoy outdoor activities!

September Temperature in Merced

In September in Merced, the average temperature is 26°C (78°F), with maximums reaching up to 45°C (114°F) and minimums dipping as low as 11°C (51°F). Be prepared for a wide range of temperatures during your travels, so pack accordingly!

September Weather in Merced: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Merced, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Merced, September typically has an average temperature of 26°C (78°F), with highs reaching up to 45°C (114°F) and lows dropping to around 11°C (51°F).
JanFebMarAprMayJunJulAugSepOctNovDec505357657280868478675750
Data source: Temperature data for Merced 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 Merced

In Merced in September, the precipitation amount is 0 mm (0.0 in) during 0 days.

September Precipitation Trends in Merced

The chart displays monthly precipitation patterns in Merced, 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 Merced, September typically receives around 0 mm (0.0 inches) of precipitation spread over approximately 0 days.
JanFebMarAprMayJunJulAugSepOctNovDec96738928231000173183
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Merced

In Merced in September, humidity is 55%. With an average temperature of 26°C (78°F), this humidity feels like a warm embrace, making travel comfortable yet slightly sticky, as you'll likely want to carry a water bottle and take occasional breaks in the shade.

September Average Humidity in Merced

This chart illustrates the average monthly humidity levels in Merced, 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 Merced 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 Merced

In Merced 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 Merced.

Maximum UV Index Levels in Merced for September

The chart shows the monthly maximum UV Index (UVI) for Merced 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 Merced typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3589101111109743
Data source: Merced 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 Merced Compares to Other Months

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

This table compares monthly weather conditions in Merced, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather10°C (51°F)96 mm (3.8 inches)82%moderate
February Weather12°C (53°F)73 mm (2.9 inches)84%moderate
March Weather14°C (57°F)89 mm (3.5 inches)82%very high
April Weather18°C (65°F)28 mm (1.1 inches)78%very high
May Weather22°C (72°F)23 mm (0.9 inches)71%very high
June Weather27°C (81°F)1 mm (0.0 inches)64%extreme
July Weather30°C (86°F)0 mm (0.0 inches)58%extreme
August Weather29°C (84°F)0 mm (0.0 inches)54%very high
September Weather26°C (78°F)0 mm (0.0 inches)55%very high
October Weather19°C (67°F)17 mm (0.7 inches)62%high
November Weather14°C (57°F)31 mm (1.2 inches)78%moderate
December Weather10°C (50°F)83 mm (3.3 inches)80%moderate

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