April Weather in Merrimack, United States

Last updated: June 24, 2025

In April, the average temperature in Merrimack, United States hovers around 9°C (48°F), offering a cool climate for visitors. Expect a minimum dip to -4°C (25°F) and rare highs reaching up to 29°C (85°F). With an average precipitation of 126 mm (5.0 in) spread over 12 days, and a humidity level of 80%, it's wise to prepare for a mix of wet and cool conditions.

April Temperature in Merrimack

In April in Merrimack, the average temperature is 9°C (48°F). Maximum temperatures can reach 29°C (85°F), while minimums can drop as low as -4°C (25°F). Travelers should be prepared for a wide range of temperatures and dress accordingly.

April Weather in Merrimack: Daily Temperature Highs, Lows, and Averages

The chart illustrates April temperature patterns in Merrimack, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Merrimack, April typically has an average temperature of 9°C (48°F), with highs reaching up to 29°C (85°F) and lows dropping to around -4°C (25°F).

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

April Precipitation in Merrimack

In Merrimack in April, the precipitation amount is 126 mm (5.0 in) over the course of 12 days.

April Precipitation Trends in Merrimack

The chart displays monthly precipitation patterns in Merrimack, with values for each month alongside April’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how April’s conditions compare to those of other months. In Merrimack, April typically receives around 126 mm (5.0 inches) of precipitation spread over approximately 12 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

April Humidity in Merrimack

In Merrimack in April humidity is 80%. With an average temperature of 9°C (48°F), this humidity feels like a damp chill that seeps into your bones, making outdoor activities less enjoyable and travel quite uncomfortable.

April Average Humidity in Merrimack

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

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

April UV Index in Merrimack

In Merrimack in April, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Merrimack.

Maximum UV Index Levels in Merrimack for April

The chart shows the monthly maximum UV Index (UVI) for Merrimack in April, 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 April, the maximum UV index in Merrimack typically reaches 8, which falls under the very high exposure category.

Data source: Merrimack April 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 April Weather in Merrimack Compares to Other Months

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

This table compares monthly weather conditions in Merrimack, showing how April’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-2°C (29°F)	71 mm (2.8 inches)	86%	moderate
February Weather	-1°C (31°F)	84 mm (3.3 inches)	84%	moderate
March Weather	2°C (37°F)	82 mm (3.2 inches)	82%	moderate
April Weather	9°C (48°F)	126 mm (5.0 inches)	80%	very high
May Weather	15°C (59°F)	81 mm (3.2 inches)	72%	very high
June Weather	20°C (69°F)	85 mm (3.3 inches)	72%	very high
July Weather	23°C (74°F)	136 mm (5.4 inches)	67%	very high
August Weather	23°C (73°F)	85 mm (3.4 inches)	66%	very high
September Weather	19°C (66°F)	77 mm (3.0 inches)	71%	high
October Weather	12°C (55°F)	128 mm (5.0 inches)	78%	high
November Weather	5°C (41°F)	98 mm (3.9 inches)	84%	moderate
December Weather	0°C (32°F)	120 mm (4.7 inches)	81%	low