April Weather in Northwest, United States

Last updated: June 24, 2025

In April, the average temperature in Northwest, United States reaches a comfortable 18°C (64°F). However, be prepared for a range of temperatures; it can dip as low as -2°C (29°F) and soar up to 30°C (86°F). Rainfall is expected, with an average precipitation of 94 mm (3.7 in) over about 10 days. The air is generally quite humid, with an average humidity level of 80%, creating a tropical atmosphere perfect for exploring.

April Temperature in Northwest

In April in Northwest, the average temperature is 18°C (64°F). The maximum can reach 30°C (86°F), and the minimum can be as low as -2°C (29°F). This varied climate suggests that travelers should pack both lighter clothing for warmer days and warmer layers for the chilly evenings.

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

The chart illustrates April temperature patterns in Northwest, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Northwest, April typically has an average temperature of 18°C (64°F), with highs reaching up to 30°C (86°F) and lows dropping to around -2°C (29°F).

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

April Precipitation in Northwest

In Northwest in April, the precipitation amount is 94 mm (3.7 in) over a duration of 10 days.

April Precipitation Trends in Northwest

The chart displays monthly precipitation patterns in Northwest, 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 Northwest, April typically receives around 94 mm (3.7 inches) of precipitation spread over approximately 10 days.

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

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Millimeters (mm) Inches (in)

April Humidity in Northwest

In Northwest in April humidity is 80%. With an average temperature of 18°C (64°F), this humidity feels like a warm, damp blanket wrapping around you, making travel a bit more exhausting as the air thickens and the heat clings to your skin.

April Average Humidity in Northwest

This chart illustrates the average monthly humidity levels in Northwest, 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 Northwest 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 Northwest

In Northwest in April, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Northwest.

Maximum UV Index Levels in Northwest for April

The chart shows the monthly maximum UV Index (UVI) for Northwest 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 Northwest typically reaches 10, which falls under the very high exposure category.

Data source: Northwest 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 Northwest Compares to Other Months

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

This table compares monthly weather conditions in Northwest, showing how April’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	9°C (48°F)	70 mm (2.8 inches)	85%	moderate
February Weather	12°C (53°F)	93 mm (3.7 inches)	82%	high
March Weather	13°C (56°F)	70 mm (2.8 inches)	81%	very high
April Weather	18°C (64°F)	94 mm (3.7 inches)	80%	very high
May Weather	22°C (72°F)	120 mm (4.7 inches)	81%	extreme
June Weather	25°C (77°F)	160 mm (6.3 inches)	81%	extreme
July Weather	27°C (80°F)	171 mm (6.7 inches)	81%	extreme
August Weather	26°C (80°F)	205 mm (8.1 inches)	80%	very high
September Weather	24°C (76°F)	193 mm (7.6 inches)	79%	very high
October Weather	20°C (69°F)	64 mm (2.5 inches)	80%	very high
November Weather	13°C (55°F)	110 mm (4.3 inches)	85%	high
December Weather	10°C (51°F)	124 mm (4.9 inches)	86%	moderate