July Weather in Johnston, United States

Last updated: June 24, 2025

In Johnston, United States, the average temperature in July hovers around a warm 28°C (82°F). Expect daily fluctuations with a minimum of 18°C (64°F) and occasional highs reaching 38°C (100°F). During this month, precipitation averages 137 mm (5.4 in) spread over approximately 16 days, accompanied by humidity levels around 80%. Prepare for a balmy, yet occasionally wet atmosphere!

July Temperature in Johnston

In July in Johnston, the average temperature is 28°C (82°F). Maximums can reach 38°C (100°F), and minimums can be as low as 18°C (64°F). This makes Johnston an ideal destination for travelers seeking warm and pleasant weather.

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

The chart illustrates July 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, July typically has an average temperature of 28°C (82°F), with highs reaching up to 38°C (100°F) and lows dropping to around 18°C (64°F).

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

July Precipitation in Johnston

In Johnston in July, the precipitation amount is 137 mm (5.4 in) over the course of 16 days.

July Precipitation Trends in Johnston

The chart displays monthly precipitation patterns in Johnston, with values for each month alongside July’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how July’s conditions compare to those of other months. In Johnston, July typically receives around 137 mm (5.4 inches) of precipitation spread over approximately 16 days.

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

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Millimeters (mm) Inches (in)

July Humidity in Johnston

In Johnston in July, humidity is 80%. With an average temperature of 28°C (82°F), this humidity feels like a warm, thick blanket enveloping you, making outdoor activities sweaty and demanding frequent breaks in the shade while traveling.

July Average Humidity in Johnston

This chart illustrates the average monthly humidity levels in Johnston, with July’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In July, average humidity in Johnston is approximately 80%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for July generated using information from the Copernicus Climate Change Service.

July UV Index in Johnston

In Johnston in July, 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 July

The chart shows the monthly maximum UV Index (UVI) for Johnston in July, 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 July, the maximum UV index in Johnston typically reaches 11, which falls under the extreme exposure category.

Data source: Johnston July 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 July 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 July’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 July’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