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September Weather in Lemon Grove, United States

Last updated: June 24, 2025

In Lemon Grove, United States, the average temperature in September is a warm 27°C (81°F). Expect temperatures to fluctuate between a comfortable 19°C (67°F) and a scorching 35°C (95°F). During this time, the region receives an average precipitation of 194 mm (7.6 in) spread over 21 days, contributing to a high average humidity level of 83%. Prepare for a cozy yet humid climate!

September Temperature in Lemon Grove

In September in Lemon Grove, the average temperature is 27°C (81°F). Maximums can reach 35°C (95°F) and minimums can be as low as 19°C (67°F). This pleasant climate makes Lemon Grove an ideal destination for travelers seeking warm and enjoyable weather.

September Weather in Lemon Grove: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Lemon Grove, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Lemon Grove, September typically has an average temperature of 27°C (81°F), with highs reaching up to 35°C (95°F) and lows dropping to around 19°C (67°F).
JanFebMarAprMayJunJulAugSepOctNovDec636970757981818281797066
Data source: Temperature data for Lemon Grove 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 Lemon Grove

In Lemon Grove in September, the precipitation amount is 194 mm (7.6 in) spread over 21 days.

September Precipitation Trends in Lemon Grove

The chart displays monthly precipitation patterns in Lemon Grove, 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 Lemon Grove, September typically receives around 194 mm (7.6 inches) of precipitation spread over approximately 21 days.
JanFebMarAprMayJunJulAugSepOctNovDec34461967134248282274194734654
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Lemon Grove

In Lemon Grove in September humidity is 83%. With an average temperature of 27°C (81°F), this humidity feels like a warm blanket enveloping you, making sightseeing and outdoor activities feel more exhausting and requiring frequent breaks to relax in the shade or cool off.

September Average Humidity in Lemon Grove

This chart illustrates the average monthly humidity levels in Lemon Grove, 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 Lemon Grove is approximately 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec83%80%75%68%65%73%77%80%83%83%83%84%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Lemon Grove

In Lemon Grove in September, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in Lemon Grove.

Maximum UV Index Levels in Lemon Grove for September

The chart shows the monthly maximum UV Index (UVI) for Lemon Grove 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 Lemon Grove typically reaches 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec6810111212121211975
Data source: Lemon Grove 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 Lemon Grove Compares to Other Months

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

This table compares monthly weather conditions in Lemon Grove, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather17°C (63°F)34 mm (1.3 inches)83%high
February Weather21°C (69°F)46 mm (1.8 inches)80%very high
March Weather21°C (71°F)19 mm (0.7 inches)75%very high
April Weather24°C (75°F)67 mm (2.6 inches)68%extreme
May Weather26°C (79°F)133 mm (5.3 inches)65%extreme
June Weather27°C (81°F)248 mm (9.8 inches)73%extreme
July Weather27°C (82°F)282 mm (11.1 inches)77%extreme
August Weather28°C (82°F)273 mm (10.8 inches)80%extreme
September Weather27°C (81°F)194 mm (7.6 inches)83%extreme
October Weather26°C (79°F)72 mm (2.9 inches)83%very high
November Weather21°C (71°F)46 mm (1.8 inches)83%high
December Weather19°C (66°F)54 mm (2.1 inches)84%moderate

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