July Weather in St Johnston, Ireland

Last updated: August 23, 2025

In July, the average temperature in St Johnston, Ireland is a comfortable 15°C (59°F). The weather can vary significantly, with lows dipping to 7°C (45°F) and highs reaching up to 28°C (83°F). Be prepared for some rain, as the area receives approximately 99 mm (3.9 in) of precipitation over about 15 days. With an average humidity of 86%, it’s a good idea to pack layers for both warmth and comfort!

July Temperature in St Johnston

In July in St Johnston, the average temperature is 15°C (59°F). Maximums can reach 28°C (83°F), while minimums can drop to as low as 7°C (45°F). This makes it a perfect time for travelers to enjoy mild weather and explore the outdoors.

July Weather in St Johnston: Daily Temperature Highs, Lows, and Averages

The chart illustrates July temperature patterns in St Johnston, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In St Johnston, July typically has an average temperature of 15°C (59°F), with highs reaching up to 28°C (83°F) and lows dropping to around 7°C (45°F).

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

July Precipitation in St Johnston

In St Johnston in July, the total precipitation amount is 99 mm (3.9 in) over the course of 15 days.

July Precipitation Trends in St Johnston

The chart displays monthly precipitation patterns in St Johnston, 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 St Johnston, July typically receives around 99 mm (3.9 inches) of precipitation spread over approximately 15 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 St Johnston

In St Johnston in July, humidity is 86%. With an average temperature of 15°C (59°F), this humidity feels like a warm, damp blanket that clings to your skin, making traveling slightly uncomfortable but still manageable if you stay hydrated and take breaks in shaded areas.

July Average Humidity in St Johnston

This chart illustrates the average monthly humidity levels in St Johnston, 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 St Johnston is approximately 86%, 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 St Johnston

In St Johnston in July, 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 St Johnston.

Maximum UV Index Levels in St Johnston for July

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

Data source: St Johnston 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 St Johnston Compares to Other Months

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

This table compares monthly weather conditions in St Johnston, showing how July’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	5°C (42°F)	72 mm (2.8 inches)	84%	low
February Weather	6°C (42°F)	113 mm (4.4 inches)	84%	low
March Weather	6°C (44°F)	106 mm (4.2 inches)	83%	moderate
April Weather	8°C (47°F)	64 mm (2.5 inches)	84%	moderate
May Weather	11°C (52°F)	93 mm (3.7 inches)	83%	high
June Weather	13°C (56°F)	107 mm (4.2 inches)	83%	very high
July Weather	15°C (59°F)	99 mm (3.9 inches)	86%	very high
August Weather	15°C (58°F)	157 mm (6.2 inches)	86%	high
September Weather	13°C (55°F)	97 mm (3.8 inches)	87%	moderate
October Weather	10°C (50°F)	112 mm (4.4 inches)	87%	moderate
November Weather	7°C (46°F)	94 mm (3.7 inches)	88%	low
December Weather	6°C (43°F)	103 mm (4.1 inches)	84%	low