March Weather in Alton, United States

Last updated: June 24, 2025

In March, the average temperature in Alton, United States hovers around 8°C (46°F). Daily temperatures can range from a chilling -17°C (2°F) to a warm 26°C (79°F). During this month, expect about 132 mm (5.2 in) of precipitation across 12 days, accompanied by a notably high average humidity of 80%. Stay prepared for a mix of weather in this vibrant locale!

March Temperature in Alton

In March in Alton, the average temperature is 8°C (46°F), with maximums reaching up to 26°C (79°F) and minimums dropping as low as -17°C (2°F). Travelers should be prepared for a wide range of weather conditions during this time.

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 8°C (46°F), with highs reaching up to 26°C (79°F) and lows dropping to around -17°C (2°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 precipitation amount is 132 mm (5.2 in) over the course of 12 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 132 mm (5.2 inches) of precipitation spread over approximately 12 days.

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

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Millimeters (mm) Inches (in)

March Humidity in Alton

In Alton in March, humidity is 80%. With an average temperature of 8°C (46°F), this humidity feels like traveling through a damp and chilly mist, making even a short walk feel heavy and uncomfortable.

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 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in Alton, you can refer to this 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 6, 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	0°C (32°F)	73 mm (2.9 inches)	82%	moderate
February Weather	1°C (35°F)	78 mm (3.1 inches)	80%	moderate
March Weather	8°C (46°F)	132 mm (5.2 inches)	80%	high
April Weather	12°C (55°F)	123 mm (4.9 inches)	80%	very high
May Weather	19°C (67°F)	150 mm (5.9 inches)	82%	very high
June Weather	25°C (77°F)	101 mm (4.0 inches)	83%	extreme
July Weather	26°C (79°F)	96 mm (3.8 inches)	81%	extreme
August Weather	24°C (76°F)	119 mm (4.7 inches)	80%	very high
September Weather	22°C (72°F)	67 mm (2.6 inches)	76%	very high
October Weather	15°C (59°F)	100 mm (3.9 inches)	76%	high
November Weather	6°C (44°F)	70 mm (2.8 inches)	85%	moderate
December Weather	3°C (38°F)	54 mm (2.1 inches)	86%	moderate