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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 20°C (68°F). During this time, minimum temperatures can dip to 7°C (45°F) while the maximum can soar to 35°C (95°F). Expect approximately 98 mm (3.8 in) of precipitation spread over 11 days, creating an average humidity level of 78%. Stay prepared for a mix of warmth and refreshing rain!

June Temperature in Johnston

In June in Johnston, the average temperature is 20°C (68°F). Maximums can reach 35°C (95°F), while minimums can be as low as 7°C (45°F). This varied climate makes Johnston an ideal destination for travelers seeking both warm days and cooler evenings.

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 20°C (68°F), with highs reaching up to 35°C (95°F) and lows dropping to around 7°C (45°F).
JanFebMarAprMayJunJulAugSepOctNovDec323439485968747366574435
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 98 mm (3.8 in) over the course of 11 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 98 mm (3.8 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec739099128103981301029313399121
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 78%. With an average temperature of 20°C (68°F), this humidity feels like a warm, enveloping blanket that makes exploring the sights a bit sticky, so travelers should stay hydrated and take frequent breaks in the shade.

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 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%84%82%79%75%78%76%76%76%75%80%80%
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 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, 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 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3568910998642
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 Weather0°C (32°F)73 mm (2.9 inches)84%moderate
February Weather1°C (34°F)90 mm (3.5 inches)84%moderate
March Weather4°C (39°F)99 mm (3.9 inches)82%high
April Weather9°C (49°F)127 mm (5.0 inches)79%very high
May Weather15°C (59°F)103 mm (4.1 inches)75%very high
June Weather20°C (68°F)98 mm (3.8 inches)78%very high
July Weather23°C (74°F)130 mm (5.1 inches)76%very high
August Weather23°C (74°F)101 mm (4.0 inches)76%very high
September Weather19°C (67°F)93 mm (3.7 inches)75%very high
October Weather14°C (57°F)133 mm (5.3 inches)75%high
November Weather7°C (44°F)99 mm (3.9 inches)80%moderate
December Weather2°C (36°F)121 mm (4.8 inches)80%low

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