Ballymena Weather in September
Average highs run from 16°C on September 1 to 14°C on September 30, and lows from 11°C to 10°C. Normal precipitation for the month is 91 mm over about 17 wet days.
September day by day
The normal high and low for each date, and the record, in °C.
- Normal low
- Normal high
- Record high
- Record low
September at a glance
- Average high
- 15°C
- Average low
- 11°C
- Precipitation
- 91 mm
- Record high
- 27°CSep 8, 2023
- Record low
- -5°CSep 17, 2009
- Daylight
- 13 h 45 min to 11 h 39 min
- Cloud cover
- 79%
- Humidity
- 87%
- Dew point
- 11°C
- Wind
- 21.6 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 | Record high | Record low | Chance wet |
|---|---|---|---|---|---|
| Sep 1 | 16°C | 11°C | 23°C 1991 | -4°C 2003 | 57% |
| Sep 2 | 16°C | 11°C | 25°C 1991 | 0°C 2004 | 57% |
| Sep 3 | 16°C | 11°C | 22°C 1996 | 5°C 1976 | 56% |
| Sep 4 | 16°C | 11°C | 24°C 1991 | 0°C 2003 | 57% |
| Sep 5 | 16°C | 11°C | 25°C 2023 | 0°C 2003 | 57% |
| Sep 6 | 16°C | 11°C | 25°C 2023 | -3°C 2003 | 58% |
| Sep 7 | 16°C | 11°C | 25°C 2023 | 0°C 2003 | 58% |
| Sep 8 | 16°C | 11°C | 27°C 2023 | 0°C 2003 | 60% |
| Sep 9 | 16°C | 11°C | 25°C 2023 | 0°C 2003 | 58% |
| Sep 10 | 15°C | 11°C | 23°C 2023 | 0°C 2003 | 58% |
| Sep 11 | 15°C | 11°C | 22°C 2014 | -2°C 2009 | 59% |
| Sep 12 | 15°C | 11°C | 20°C 2002 | -2°C 2003 | 59% |
| Sep 13 | 15°C | 11°C | 22°C 2003 | 0°C 2004 | 58% |
| Sep 14 | 15°C | 11°C | 21°C 1982 | 2°C 1986 | 57% |
| Sep 15 | 15°C | 11°C | 20°C 1980 | -4°C 2004 | 57% |
| Sep 16 | 15°C | 11°C | 22°C 1982 | -1°C 2004 | 56% |
| Sep 17 | 15°C | 10°C | 22°C 1982 | -5°C 2009 | 56% |
| Sep 18 | 15°C | 10°C | 20°C 1989 | -1°C 2004 | 56% |
| Sep 19 | 15°C | 10°C | 21°C 2024 | -1°C 2003 | 54% |
| Sep 20 | 15°C | 10°C | 22°C 1998 | -1°C 2009 | 53% |
| Sep 21 | 15°C | 10°C | 23°C 1998 | 0°C 2009 | 52% |
| Sep 22 | 15°C | 10°C | 20°C 2013 | 0°C 2003 | 52% |
| Sep 23 | 15°C | 10°C | 20°C 2000 | 0°C 2003 | 54% |
| Sep 24 | 15°C | 10°C | 19°C 1989 | 0°C 2003 | 56% |
| Sep 25 | 14°C | 10°C | 20°C 2021 | 0°C 2003 | 57% |
| Sep 26 | 14°C | 10°C | 21°C 2021 | 0°C 2004 | 57% |
| Sep 27 | 14°C | 10°C | 22°C 1985 | 0°C 1974 | 58% |
| Sep 28 | 14°C | 10°C | 21°C 1985 | 1°C 1974 | 59% |
| Sep 29 | 14°C | 10°C | 21°C 2011 | 0°C 2004 | 60% |
| Sep 30 | 14°C | 10°C | 21°C 1985 | -3°C 2003 | 62% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (GMT+1).
- September 1
- sunrise 6:32 AM, sunset 8:17 PM
- September 30
- sunrise 7:25 AM, sunset 7:04 PM
Other months
Sources
Records: NOAA GHCN-Daily, station UKM00003917, every year on file, quality-flagged values removed. 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.