July Weather in Derry, United States

Last updated: June 24, 2025

In Derry, United States, the average temperature in July is a pleasant 23°C (74°F). However, be prepared for varying conditions, as temperatures can dip to a minimum of 11°C (52°F) and soar to a maximum of 37°C (99°F). During this period, expect around 135 mm (5.3 in) of precipitation spread over 12 days, contributing to an average humidity of 67%. Stay comfortable and plan accordingly for the weather!

July Temperature in Derry

In July in Derry, the average temperature is 23°C (74°F), with maximums reaching up to 37°C (99°F) and minimums dropping as low as 11°C (52°F). This range makes it an ideal time for travelers seeking warmth while also enjoying cooler evenings.

July Weather in Derry: Daily Temperature Highs, Lows, and Averages

The chart illustrates July temperature patterns in Derry, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Derry, July typically has an average temperature of 23°C (74°F), with highs reaching up to 37°C (99°F) and lows dropping to around 11°C (52°F).

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

July Precipitation in Derry

In Derry in July, the precipitation amount is 135 mm (5.3 in), occurring over the course of 12 days.

July Precipitation Trends in Derry

The chart displays monthly precipitation patterns in Derry, with values for each month alongside July’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how July’s conditions compare to those of other months. In Derry, July typically receives around 135 mm (5.3 inches) of precipitation spread over approximately 12 days.

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

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Millimeters (mm) Inches (in)

July Humidity in Derry

In Derry in July humidity is 67%. With an average temperature of 23°C (74°F), this humidity feels like a warm embrace, making outdoor exploration pleasant yet slightly sticky, perfect for leisurely strolls but requiring occasional breaks for hydration.

July Average Humidity in Derry

This chart illustrates the average monthly humidity levels in Derry, with July’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In July, average humidity in Derry is approximately 67%, offering insight into how humid the weather typically is during this month.

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

July UV Index in Derry

In Derry in July, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Derry.

Maximum UV Index Levels in Derry for July

The chart shows the monthly maximum UV Index (UVI) for Derry in July, 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 July, the maximum UV index in Derry typically reaches 9, which falls under the very high exposure category.

Data source: Derry July 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 July Weather in Derry Compares to Other Months

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

This table compares monthly weather conditions in Derry, showing how July’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-3°C (28°F)	70 mm (2.7 inches)	86%	moderate
February Weather	-1°C (30°F)	84 mm (3.3 inches)	84%	moderate
March Weather	2°C (36°F)	82 mm (3.2 inches)	82%	moderate
April Weather	8°C (47°F)	128 mm (5.0 inches)	80%	very high
May Weather	15°C (58°F)	77 mm (3.0 inches)	72%	very high
June Weather	20°C (69°F)	89 mm (3.5 inches)	72%	very high
July Weather	23°C (74°F)	135 mm (5.3 inches)	67%	very high
August Weather	23°C (73°F)	75 mm (2.9 inches)	66%	very high
September Weather	19°C (66°F)	72 mm (2.8 inches)	71%	high
October Weather	12°C (54°F)	125 mm (4.9 inches)	78%	moderate
November Weather	4°C (40°F)	99 mm (3.9 inches)	84%	moderate
December Weather	-1°C (31°F)	122 mm (4.8 inches)	81%	low