March Weather in Alton, United States

Last updated: June 24, 2025

In March, the average temperature in Alton, United States is a refreshing 10°C (50°F). However, don't be surprised by the temperature fluctuations: it can dip to a brisk -12°C (10°F) during colder nights or rise to a warm 29°C (85°F) on sunny days. Expect some precipitation, with an average of 148 mm (5.8 in) spread over 14 days. Don't forget, the average humidity lingers around 80%, adding to the overall atmospheric experience!

March Temperature in Alton

In March in Alton, the average temperature is 10°C (50°F). Maximums can reach 29°C (85°F) and minimums can be as low as -12°C (10°F). This range makes Alton a destination for diverse experiences, so travelers should prepare for both warm days and chilly nights.

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

The chart illustrates March temperature patterns in Alton, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Alton, March typically has an average temperature of 10°C (50°F), with highs reaching up to 29°C (85°F) and lows dropping to around -12°C (10°F).

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

March Precipitation in Alton

In Alton in March, the total precipitation amount is 148 mm (5.8 in) over the course of 14 days.

March Precipitation Trends in Alton

The chart displays monthly precipitation patterns in Alton, 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 Alton, March typically receives around 148 mm (5.8 inches) of precipitation spread over approximately 14 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 Alton

In Alton in March, humidity is 80%. With an average temperature of 10°C (50°F), this humidity feels like a damp chill enveloping you, making traveling somewhat uncomfortable as it seeps into your clothes and clings to your skin, leaving you longing for a cozy indoor refuge.

March Average Humidity in Alton

This chart illustrates the average monthly humidity levels in Alton, 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 Alton is approximately 80%, 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 Alton

In Alton in March, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Alton.

Maximum UV Index Levels in Alton for March

The chart shows the monthly maximum UV Index (UVI) for Alton 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 Alton typically reaches 7, which falls under the high exposure category.

Data source: Alton 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 Alton Compares to Other Months

Weather in Alton varies notably across the year, with each month offering distinct climate conditions. This page compares March’s weather to other months in Alton, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Alton, showing how March’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	2°C (36°F)	85 mm (3.3 inches)	83%	moderate
February Weather	4°C (40°F)	111 mm (4.4 inches)	81%	high
March Weather	10°C (50°F)	148 mm (5.8 inches)	80%	high
April Weather	13°C (56°F)	164 mm (6.5 inches)	80%	very high
May Weather	19°C (67°F)	181 mm (7.1 inches)	83%	extreme
June Weather	24°C (76°F)	85 mm (3.3 inches)	83%	extreme
July Weather	26°C (80°F)	80 mm (3.2 inches)	76%	extreme
August Weather	25°C (77°F)	106 mm (4.2 inches)	69%	very high
September Weather	23°C (73°F)	62 mm (2.4 inches)	68%	very high
October Weather	16°C (60°F)	121 mm (4.8 inches)	72%	high
November Weather	8°C (47°F)	77 mm (3.0 inches)	83%	moderate
December Weather	6°C (42°F)	81 mm (3.2 inches)	86%	moderate