June Weather in Johnston, United States

Last updated: June 24, 2025

In June, the average temperature in Johnston, United States is a warm 26°C (79°F). Expect a range from a cool 13°C (56°F) to a sizzling 37°C (100°F). With 101 mm (4.0 in) of precipitation over about 14 days, it's wise to bring an umbrella. The average humidity sits at a comfortable 75%, making for a pleasant atmosphere throughout the month.

June Temperature in Johnston

In June, in Johnston, the average temperature is 26°C (79°F). Maximums can reach 37°C (100°F), while minimums can drop as low as 13°C (56°F). This makes Johnston an ideal destination for travelers seeking warm weather, but it's wise to pack for both hot days and cooler nights.

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 26°C (79°F), with highs reaching up to 37°C (100°F) and lows dropping to around 13°C (56°F).

Data source: Temperature data for Johnston generated using information from the Copernicus Climate Change Service.

June Precipitation in Johnston

In Johnston in June, the precipitation amount is 101 mm (4.0 in) over the course of 14 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 101 mm (4.0 inches) of precipitation spread over approximately 14 days.

Data source: Precipitation data for June generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

June Humidity in Johnston

In Johnston in June, humidity is 75%. With an average temperature of 26°C (79°F), this humidity feels like a warm blanket wrapped around you, making traveling a sticky experience where every step requires extra effort and frequent breaks to cool off.

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 75%, offering insight into how humid the weather typically is during this month.

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.

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.
	Temperature	Precipitation	Humidity	UV
January Weather	9°C (48°F)	84 mm (3.3 inches)	86%	moderate
February Weather	12°C (54°F)	114 mm (4.5 inches)	81%	high
March Weather	14°C (58°F)	85 mm (3.4 inches)	81%	very high
April Weather	18°C (65°F)	115 mm (4.5 inches)	79%	very high
May Weather	23°C (74°F)	110 mm (4.3 inches)	75%	extreme
June Weather	26°C (79°F)	101 mm (4.0 inches)	75%	extreme
July Weather	28°C (82°F)	137 mm (5.4 inches)	80%	extreme
August Weather	27°C (80°F)	142 mm (5.6 inches)	81%	extreme
September Weather	25°C (77°F)	84 mm (3.3 inches)	83%	very high
October Weather	20°C (69°F)	80 mm (3.1 inches)	78%	very high
November Weather	13°C (55°F)	69 mm (2.7 inches)	85%	high
December Weather	10°C (51°F)	119 mm (4.7 inches)	87%	moderate