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June Weather in Costa Mesa, United States

Last updated: June 24, 2025

In June, the average temperature in Costa Mesa, United States is a pleasant 20°C (68°F). Expect a comfortable range with a minimum of 14°C (57°F) and a maximum of 33°C (91°F). This month brings light rainfall, with total precipitation averaging just 4 mm (0.2 in) over 0 days. The air feels fairly humid at 72%, creating a warm and inviting atmosphere.

June Temperature in Costa Mesa

In June in Costa Mesa, the average temperature is 20°C (68°F), with maximums reaching 33°C (91°F) and minimums dipping as low as 14°C (57°F). This mild climate makes Costa Mesa an ideal destination for travelers looking to enjoy pleasant outdoor activities during this time.

June Weather in Costa Mesa: Daily Temperature Highs, Lows, and Averages

The chart illustrates June temperature patterns in Costa Mesa, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Costa Mesa, June typically has an average temperature of 20°C (68°F), with highs reaching up to 33°C (91°F) and lows dropping to around 14°C (57°F).
JanFebMarAprMayJunJulAugSepOctNovDec575759636467727372696357
Data source: Temperature data for Costa Mesa 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.

June Precipitation in Costa Mesa

In Costa Mesa in June, the precipitation amount is 4 mm (0.2 in) over the course of 0 days.

June Precipitation Trends in Costa Mesa

The chart displays monthly precipitation patterns in Costa Mesa, with values for each month alongside June’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how June’s conditions compare to those of other months. In Costa Mesa, June typically receives around 4 mm (0.2 inches) of precipitation spread over approximately 0 days.
JanFebMarAprMayJunJulAugSepOctNovDec6552552312432391868
Data source: Precipitation data for June generated using information from the Copernicus Climate Change Service.
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June Humidity in Costa Mesa

In Costa Mesa in June humidity is 72%. With an average temperature of 20°C (68°F), this humidity feels like a heavy blanket enveloping you, making every step slightly more laborious and the air thick with moisture, which can be uncomfortable for traveling.

June Average Humidity in Costa Mesa

This chart illustrates the average monthly humidity levels in Costa Mesa, with June’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In June, average humidity in Costa Mesa is approximately 72%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec74%79%75%71%70%72%73%69%68%67%68%71%
Data source: Humidity data for June generated using information from the Copernicus Climate Change Service.

June UV Index in Costa Mesa

In Costa Mesa in June, 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 Costa Mesa.

Maximum UV Index Levels in Costa Mesa for June

The chart shows the monthly maximum UV Index (UVI) for Costa Mesa in June, 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 June, the maximum UV index in Costa Mesa typically reaches 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec468101011111010754
Data source: Costa Mesa June 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 June Weather in Costa Mesa Compares to Other Months

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

This table compares monthly weather conditions in Costa Mesa, showing how June’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather14°C (57°F)65 mm (2.5 inches)74%moderate
February Weather14°C (58°F)52 mm (2.0 inches)79%high
March Weather15°C (60°F)55 mm (2.2 inches)75%very high
April Weather17°C (63°F)23 mm (0.9 inches)70%very high
May Weather18°C (64°F)12 mm (0.5 inches)70%very high
June Weather20°C (68°F)4 mm (0.2 inches)72%extreme
July Weather22°C (72°F)3 mm (0.1 inches)73%extreme
August Weather23°C (73°F)2 mm (0.1 inches)69%very high
September Weather22°C (72°F)3 mm (0.1 inches)68%very high
October Weather20°C (69°F)9 mm (0.4 inches)67%high
November Weather17°C (63°F)18 mm (0.7 inches)68%moderate
December Weather14°C (58°F)68 mm (2.7 inches)71%moderate

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