March Weather in Johnston, United States

Last updated: June 24, 2025

In March, the average temperature in Johnston, United States hovers around 4°C (40°F). Visitors should prepare for a temperature range that can dip as low as -21°C (-5°F) and soar up to 23°C (74°F). With an average precipitation amount of 81 mm (3.2 in) spread over 8 days, it’s wise to keep an umbrella handy. Additionally, the average humidity level sits at a comfortable 77%, making it a unique time to explore this captivating destination.

March Temperature in Johnston

In March in Johnston, the average temperature is 4°C (40°F). Maximums can reach 23°C (74°F), and minimums can be as low as -21°C (-5°F). Travelers should be prepared for a wide range of temperatures and pack accordingly.

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

The chart illustrates March 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, March typically has an average temperature of 4°C (40°F), with highs reaching up to 23°C (74°F) and lows dropping to around -21°C (-5°F).

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

March Precipitation in Johnston

In Johnston in March, the precipitation amount is 81 mm (3.2 in) over the course of 8 days.

March Precipitation Trends in Johnston

The chart displays monthly precipitation patterns in Johnston, with values for each month alongside March’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how March’s conditions compare to those of other months. In Johnston, March typically receives around 81 mm (3.2 inches) of precipitation spread over approximately 8 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

March Humidity in Johnston

In Johnston in March humidity is 77%. With an average temperature of 4°C (40°F), this humidity feels like a damp chill that penetrates your clothing, making outdoor exploration less enjoyable and prompting travelers to seek shelter or warm indoor activities instead.

March Average Humidity in Johnston

This chart illustrates the average monthly humidity levels in Johnston, with March’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In March, average humidity in Johnston is approximately 77%, offering insight into how humid the weather typically is during this month.

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

March UV Index in Johnston

In Johnston in March, the maximum UV index is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in Johnston, you can refer to this Hourly UV Index in Johnston.

Maximum UV Index Levels in Johnston for March

The chart shows the monthly maximum UV Index (UVI) for Johnston in March, 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 March, the maximum UV index in Johnston typically reaches 6, which falls under the high exposure category.

Data source: Johnston March 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 March 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 March’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 March’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
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 Weather	4°C (40°F)	81 mm (3.2 inches)	77%	high
April Weather	9°C (49°F)	75 mm (2.9 inches)	77%	very high
May Weather	17°C (62°F)	169 mm (6.7 inches)	77%	very high
June Weather	23°C (74°F)	109 mm (4.3 inches)	81%	extreme
July Weather	25°C (77°F)	76 mm (3.0 inches)	81%	very high
August Weather	23°C (74°F)	87 mm (3.4 inches)	77%	very high
September Weather	20°C (69°F)	120 mm (4.7 inches)	73%	very high
October Weather	11°C (53°F)	128 mm (5.0 inches)	75%	high
November Weather	3°C (39°F)	39 mm (1.5 inches)	85%	moderate
December Weather	-1°C (31°F)	37 mm (1.5 inches)	83%	moderate