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June Weather in Portola Valley, United States

Last updated: June 24, 2025

In June, the average temperature in Portola Valley, United States hovers around 17°C (63°F), making it quite pleasant. Temperatures can fluctuate, with a minimum of 10°C (49°F) and a maximum reaching up to 35°C (96°F). Rainfall is minimal, with just 2 mm (0.1 in) of precipitation over 0 days, while humidity remains at a comfortable 64%. Enjoy the mild climate and low chances of rain!

June Temperature in Portola Valley

In June in Portola Valley, the average temperature is 17°C (63°F). Maximum temperatures can reach 35°C (96°F), while minimums can drop as low as 10°C (49°F). This makes it a great time for travelers to enjoy mild weather and diverse outdoor activities.

June Weather in Portola Valley: Daily Temperature Highs, Lows, and Averages

The chart illustrates June temperature patterns in Portola Valley, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Portola Valley, June typically has an average temperature of 17°C (63°F), with highs reaching up to 35°C (96°F) and lows dropping to around 10°C (49°F).
JanFebMarAprMayJunJulAugSepOctNovDec525354565863636565625652
Data source: Temperature data for Portola Valley 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 Portola Valley

In Portola Valley in June, the precipitation amount is 2 mm (0.1 in) during a span of 0 days.

June Precipitation Trends in Portola Valley

The chart displays monthly precipitation patterns in Portola Valley, 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 Portola Valley, June typically receives around 2 mm (0.1 inches) of precipitation spread over approximately 0 days.
JanFebMarAprMayJunJulAugSepOctNovDec1051008633242012244788
Data source: Precipitation data for June generated using information from the Copernicus Climate Change Service.
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June Humidity in Portola Valley

In Portola Valley in June humidity is 64%. With an average temperature of 17°C (63°F), this humidity feels like a mild dampness that can make outdoor activities feel slightly muggy, but it's still comfortable for exploring the area.

June Average Humidity in Portola Valley

This chart illustrates the average monthly humidity levels in Portola Valley, 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 Portola Valley 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 Portola Valley

In Portola Valley 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 Portola Valley.

Maximum UV Index Levels in Portola Valley for June

The chart shows the monthly maximum UV Index (UVI) for Portola Valley 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 Portola Valley typically reaches 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3589101111109743
Data source: Portola Valley 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 Portola Valley Compares to Other Months

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

This table compares monthly weather conditions in Portola Valley, showing how June’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather11°C (52°F)105 mm (4.1 inches)82%moderate
February Weather11°C (53°F)100 mm (3.9 inches)84%moderate
March Weather12°C (54°F)86 mm (3.4 inches)82%very high
April Weather13°C (57°F)33 mm (1.3 inches)78%very high
May Weather15°C (59°F)24 mm (0.9 inches)71%very high
June Weather17°C (63°F)2 mm (0.1 inches)64%extreme
July Weather17°C (63°F)0 mm (0.0 inches)58%extreme
August Weather18°C (65°F)0 mm (0.0 inches)54%very high
September Weather18°C (66°F)2 mm (0.1 inches)55%very high
October Weather17°C (63°F)24 mm (0.9 inches)62%high
November Weather13°C (56°F)47 mm (1.9 inches)78%moderate
December Weather11°C (52°F)88 mm (3.5 inches)80%moderate

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