Belfast Weather in August
Average highs run from 18°C on August 1 to 17°C on August 31, and lows from 12°C to 10°C. Normal precipitation for the month is 98 mm over about 19 wet days.
August day by day
The normal high and low for each date, in °C.
- Normal low
- Normal high
- Reanalysis extreme high
- Reanalysis extreme low
August at a glance
- Average high
- 18°C
- Average low
- 11°C
- Precipitation
- 98 mm
- Reanalysis high
- 25°CAug 20, 1995
- Reanalysis low
- 6°CAug 13, 1993
- Daylight
- 15 h 51 min to 13 h 49 min
- Cloud cover
- 77%
- Humidity
- 87%
- Dew point
- 12°C
- Wind
- 17.3 km/h
Every day of the month
A wet day has at least 1 mm of precipitation in the reanalysis.
| Date | Normal high | Normal low | Reanalysis high | Reanalysis low | Chance wet |
|---|---|---|---|---|---|
| Aug 1 | 18°C | 12°C | 24°C 1995 | 7°C 2015 | 64% |
| Aug 2 | 18°C | 12°C | 24°C 1995 | 9°C 1997 | 65% |
| Aug 3 | 18°C | 12°C | 23°C 1995 | 9°C 2020 | 65% |
| Aug 4 | 18°C | 12°C | 22°C 2002 | 9°C 1993 | 65% |
| Aug 5 | 18°C | 12°C | 23°C 2003 | 8°C 2017 | 64% |
| Aug 6 | 18°C | 12°C | 24°C 2003 | 9°C 1992 | 64% |
| Aug 7 | 18°C | 12°C | 23°C 2003 | 8°C 1996 | 63% |
| Aug 8 | 18°C | 12°C | 23°C 2003 | 8°C 2007 | 61% |
| Aug 9 | 18°C | 11°C | 23°C 2003 | 8°C 2018 | 62% |
| Aug 10 | 18°C | 11°C | 22°C 1995 | 8°C 1999 | 62% |
| Aug 11 | 18°C | 11°C | 23°C 1995 | 7°C 1993 | 62% |
| Aug 12 | 18°C | 11°C | 21°C 1997 | 7°C 1993 | 62% |
| Aug 13 | 18°C | 11°C | 22°C 2001 | 6°C 1993 | 62% |
| Aug 14 | 18°C | 11°C | 21°C 1997 | 8°C 1994 | 62% |
| Aug 15 | 18°C | 11°C | 23°C 1995 | 6°C 1993 | 63% |
| Aug 16 | 18°C | 11°C | 22°C 1995 | 7°C 1993 | 64% |
| Aug 17 | 18°C | 11°C | 23°C 1995 | 7°C 2011 | 63% |
| Aug 18 | 18°C | 11°C | 23°C 1995 | 7°C 1992 | 63% |
| Aug 19 | 18°C | 11°C | 24°C 1995 | 7°C 2011 | 62% |
| Aug 20 | 18°C | 11°C | 25°C 1995 | 7°C 2014 | 62% |
| Aug 21 | 17°C | 11°C | 23°C 1995 | 8°C 1994 | 62% |
| Aug 22 | 17°C | 11°C | 20°C 2007 | 8°C 2014 | 61% |
| Aug 23 | 17°C | 11°C | 23°C 2003 | 7°C 1993 | 60% |
| Aug 24 | 17°C | 11°C | 22°C 2003 | 7°C 2014 | 58% |
| Aug 25 | 17°C | 11°C | 22°C 2019 | 6°C 2015 | 57% |
| Aug 26 | 17°C | 11°C | 20°C 1991 | 8°C 2005 | 56% |
| Aug 27 | 17°C | 11°C | 20°C 2002 | 7°C 1998 | 55% |
| Aug 28 | 17°C | 11°C | 22°C 1991 | 8°C 1992 | 54% |
| Aug 29 | 17°C | 10°C | 23°C 1991 | 7°C 1992 | 54% |
| Aug 30 | 17°C | 10°C | 21°C 1991 | 7°C 2010 | 53% |
| Aug 31 | 17°C | 10°C | 20°C 1993 | 7°C 2010 | 52% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (GMT+1).
- August 1
- sunrise 5:34 AM, sunset 9:25 PM
- August 31
- sunrise 6:29 AM, sunset 8:18 PM
Other months
Sources
Cloud, humidity, wind and sunshine, and temperature and precipitation: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-26. Sun and moon: computed with the NOAA solar equations and Meeus.