August Weather in Belfast, United States

Last updated: June 24, 2025

In August, the average temperature in Belfast, United States hovers around 20°C (68°F). Expect a minimum of 9°C (48°F) and a pleasant maximum of 32°C (91°F). During this time, precipitation averages 75 mm (3.0 in) across 9 days, contributing to an overall humidity of 74%.

August Temperature in Belfast

In August in Belfast, the average temperature is 20°C (68°F). Maximums can reach 32°C (91°F) and minimums can be as low as 9°C (48°F). Be sure to pack a mix of clothing for both warm and cooler weather during your travels.

August Weather in Belfast: Daily Temperature Highs, Lows, and Averages

The chart illustrates August temperature patterns in Belfast, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Belfast, August typically has an average temperature of 20°C (68°F), with highs reaching up to 32°C (91°F) and lows dropping to around 9°C (48°F).

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

August Precipitation in Belfast

In Belfast in August, the precipitation amount is 75 mm (3.0 in) distributed over 9 days.

August Precipitation Trends in Belfast

The chart displays monthly precipitation patterns in Belfast, with values for each month alongside August’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how August’s conditions compare to those of other months. In Belfast, August typically receives around 75 mm (3.0 inches) of precipitation spread over approximately 9 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

August Humidity in Belfast

In Belfast in August humidity is 74%. With an average temperature of 20°C (68°F), this humidity feels like a warm, sticky embrace that can make outdoor activities feel exhausting, prompting travelers to seek shade and hydration more often.

August Average Humidity in Belfast

This chart illustrates the average monthly humidity levels in Belfast, with August’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In August, average humidity in Belfast is approximately 74%, offering insight into how humid the weather typically is during this month.

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

August UV Index in Belfast

In Belfast in August, 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 Belfast.

Maximum UV Index Levels in Belfast for August

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

Data source: Belfast August 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 August Weather in Belfast Compares to Other Months

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

This table compares monthly weather conditions in Belfast, showing how August’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-4°C (24°F)	93 mm (3.7 inches)	88%	low
February Weather	-4°C (26°F)	88 mm (3.5 inches)	88%	moderate
March Weather	0°C (32°F)	72 mm (2.9 inches)	85%	moderate
April Weather	6°C (43°F)	131 mm (5.2 inches)	81%	high
May Weather	11°C (53°F)	90 mm (3.6 inches)	76%	very high
June Weather	17°C (63°F)	76 mm (3.0 inches)	74%	very high
July Weather	20°C (68°F)	91 mm (3.6 inches)	74%	very high
August Weather	20°C (68°F)	75 mm (3.0 inches)	74%	very high
September Weather	16°C (61°F)	77 mm (3.0 inches)	77%	high
October Weather	11°C (51°F)	130 mm (5.1 inches)	82%	moderate
November Weather	3°C (38°F)	121 mm (4.8 inches)	85%	moderate
December Weather	-2°C (28°F)	129 mm (5.1 inches)	84%	low