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June Weather in Johnston, United States

Last updated: June 24, 2025

In June, the average temperature in Johnston, United States hovers around 23°C (74°F). Expect a broad temperature range with a cool minimum of 9°C (49°F) and occasional highs reaching up to 39°C (102°F). During this time, you can anticipate 109 mm (4.3 in) of precipitation spread over about 10 days, coupled with an average humidity of 81%. Embrace the warmth and occasional rain for a truly vibrant experience!

June Temperature in Johnston

In June in Johnston, the average temperature is 23°C (74°F). Maximum temperatures can reach as high as 39°C (102°F), while the minimum can drop to as low as 9°C (49°F). It's advisable for travelers to prepare for both warm days and cool nights during this time.

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

The chart illustrates June temperature patterns in Johnston, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Johnston, June typically has an average temperature of 23°C (74°F), with highs reaching up to 39°C (102°F) and lows dropping to around 9°C (49°F).
JanFebMarAprMayJunJulAugSepOctNovDec222339496274777468523830
Data source: Temperature data for Johnston 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 Johnston

In Johnston in June, the precipitation amount is 109 mm (4.3 in) spread over 10 days.

June Precipitation Trends in Johnston

The chart displays monthly precipitation patterns in Johnston, 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 Johnston, June typically receives around 109 mm (4.3 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec3740817516910976871201283937
Data source: Precipitation data for June generated using information from the Copernicus Climate Change Service.
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June Humidity in Johnston

In Johnston in June, humidity is 81%. With an average temperature of 23°C (74°F), this humidity feels like a warm, heavy blanket draped over your skin, making travel feel a bit more sluggish and requiring plenty of water breaks to stay comfortable.

June Average Humidity in Johnston

This chart illustrates the average monthly humidity levels in Johnston, 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 Johnston is approximately 81%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec78%80%77%78%77%81%81%77%73%75%85%83%
Data source: Humidity data for June generated using information from the Copernicus Climate Change Service.

June UV Index in Johnston

In Johnston 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 Johnston.

Maximum UV Index Levels in Johnston for June

The chart shows the monthly maximum UV Index (UVI) for Johnston 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 Johnston typically reaches 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec35689111098643
Data source: Johnston 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 Johnston Compares to Other Months

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

This table compares monthly weather conditions in Johnston, showing how June’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-6°C (22°F)37 mm (1.4 inches)78%moderate
February Weather-5°C (23°F)40 mm (1.6 inches)80%moderate
March Weather4°C (40°F)81 mm (3.2 inches)77%high
April Weather9°C (49°F)75 mm (2.9 inches)77%very high
May Weather17°C (62°F)169 mm (6.7 inches)77%very high
June Weather23°C (74°F)109 mm (4.3 inches)81%extreme
July Weather25°C (77°F)76 mm (3.0 inches)81%very high
August Weather23°C (74°F)87 mm (3.4 inches)77%very high
September Weather20°C (69°F)120 mm (4.7 inches)73%very high
October Weather11°C (53°F)128 mm (5.0 inches)75%high
November Weather3°C (39°F)39 mm (1.5 inches)85%moderate
December Weather-1°C (31°F)37 mm (1.5 inches)83%moderate

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