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June Weather in Sunnyvale, United States

Last updated: June 24, 2025

In June, the average temperature in Sunnyvale, United States is a pleasant 18°C (64°F). While you can expect minimums of 8°C (47°F) and can sometimes soar to 37°C (99°F), the weather remains largely dry with just 1 mm (0.0 in) of precipitation over 0 days. Humidity levels linger around 64%, making for comfortable conditions throughout the month.

June Temperature in Sunnyvale

In June in Sunnyvale, the average temperature is 18°C (64°F), with maximums potentially reaching 37°C (99°F) and minimums dropping as low as 8°C (47°F). This makes it a great time to travel, offering warm days for outdoor exploration and cooler nights for comfortable relaxation.

June Weather in Sunnyvale: Daily Temperature Highs, Lows, and Averages

The chart illustrates June temperature patterns in Sunnyvale, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sunnyvale, June typically has an average temperature of 18°C (64°F), with highs reaching up to 37°C (99°F) and lows dropping to around 8°C (47°F).
JanFebMarAprMayJunJulAugSepOctNovDec505153565964666766635550
Data source: Temperature data for Sunnyvale 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 Sunnyvale

In Sunnyvale in June, the precipitation amount is 1 mm (0.0 in) during a span of 0 days.

June Precipitation Trends in Sunnyvale

The chart displays monthly precipitation patterns in Sunnyvale, 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 Sunnyvale, June typically receives around 1 mm (0.0 inches) of precipitation spread over approximately 0 days.
JanFebMarAprMayJunJulAugSepOctNovDec145133114372410132556116
Data source: Precipitation data for June generated using information from the Copernicus Climate Change Service.
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June Humidity in Sunnyvale

In Sunnyvale in June humidity is 64%. With an average temperature of 18°C (64°F), this humidity feels like a pleasant yet slightly sticky embrace, making travel enjoyable but requiring a light layer to stay comfortable while exploring the sights.

June Average Humidity in Sunnyvale

This chart illustrates the average monthly humidity levels in Sunnyvale, 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 Sunnyvale is approximately 64%, 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 June generated using information from the Copernicus Climate Change Service.

June UV Index in Sunnyvale

In Sunnyvale 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 Sunnyvale.

Maximum UV Index Levels in Sunnyvale for June

The chart shows the monthly maximum UV Index (UVI) for Sunnyvale 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 Sunnyvale typically reaches 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec4589111111109753
Data source: Sunnyvale 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 Sunnyvale Compares to Other Months

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

This table compares monthly weather conditions in Sunnyvale, showing how June’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather10°C (51°F)145 mm (5.7 inches)82%moderate
February Weather11°C (52°F)133 mm (5.2 inches)84%moderate
March Weather11°C (53°F)114 mm (4.5 inches)82%very high
April Weather13°C (56°F)37 mm (1.4 inches)78%very high
May Weather15°C (59°F)24 mm (0.9 inches)71%extreme
June Weather18°C (64°F)1 mm (0.0 inches)64%extreme
July Weather19°C (66°F)0 mm (0.0 inches)58%extreme
August Weather19°C (67°F)0 mm (0.0 inches)54%very high
September Weather19°C (67°F)3 mm (0.1 inches)55%very high
October Weather17°C (63°F)25 mm (1.0 inches)62%high
November Weather13°C (56°F)56 mm (2.2 inches)78%moderate
December Weather10°C (50°F)116 mm (4.6 inches)80%moderate

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