August Weather in Johnston, United States

Last updated: June 24, 2025

In Johnston, United States, the average temperature in August hovers around 27°C (80°F), with a minimum of 16°C (61°F) and a maximum of 36°C (97°F). Expect 142 mm (5.6 in) of precipitation spread over 16 days, while the average humidity lingers at a high 81%. Stay prepared for a warm and wet month!

August Temperature in Johnston

In August in Johnston, the average temperature is 27°C (80°F). Maximums can reach 36°C (97°F), while minimums can dip as low as 16°C (61°F). This pleasant climate makes Johnston an ideal destination for travelers seeking a warm and comfortable escape.

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

The chart illustrates August 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, August typically has an average temperature of 27°C (80°F), with highs reaching up to 36°C (97°F) and lows dropping to around 16°C (61°F).

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

August Precipitation in Johnston

In Johnston in August, the precipitation amount is 142 mm (5.6 in) distributed over 16 days.

August Precipitation Trends in Johnston

The chart displays monthly precipitation patterns in Johnston, with values for each month alongside August’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how August’s conditions compare to those of other months. In Johnston, August typically receives around 142 mm (5.6 inches) of precipitation spread over approximately 16 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

August Humidity in Johnston

In Johnston in August, humidity is 81%. With an average temperature of 27°C (80°F), this humidity feels like a warm blanket wrapping around you, making travel feel sticky and heavy, but the vibrant atmosphere can still be invigorating, inviting moments of exploration in slower, more deliberate steps.

August Average Humidity in Johnston

This chart illustrates the average monthly humidity levels in Johnston, with August’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In August, average humidity in Johnston is approximately 81%, offering insight into how humid the weather typically is during this month.

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

August UV Index in Johnston

In Johnston in August, 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 August

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

Data source: Johnston August 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 August 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 August’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 August’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