Northern Ireland climate by month
8-year averages · when to visit| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Belfast | 7° | 8° | 9° | 12° | 15° | 17° | 19° | 18° | 16° | 13° | 10° | 8° |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Belfast | 12 | 14 | 16 | 13 | 14 | 15 | 17 | 18 | 15 | 16 | 15 | 15 |
Figures are averaged over 8 years of ERA5 reanalysis; sea temps come from ocean reanalysis, and UV is derived from solar elevation.
Belfast climate in September
8-year averages · when to visit
| August | September | October | |
|---|---|---|---|
| Average temperature | ▼ 15°C | 13°C | ▼ 11°C |
| Typical high | ▼ 18°C | 16°C | ▼ 13°C |
| Typical low | ▼ 12°C | 10°C | ▼ 8°C |
| Precipitation | ▼ 108 mm | 99 mm | ▲ 109 mm |
| Wet days | ▼ 18 d | 15 d | ▲ 16 d |
| Humidity | ▲ 80% | 83% | ▲ 85% |
| Sunshine per day | ▼ 9.6 h | 7.7 h | ▼ 5.4 h |
| Cloud cover | ▲ 36% | 39% | ▲ 48% |
| Midday UV | ▼ 7 | 5 | ▼ 2 |
| Daylight | 14:51 | 12:42 | 10:29 |
| Our take | Acceptable | Acceptable | Poor |
September temperatures day by day daily mean + smoothed trend · °C
September precipitation day by day mm
September UV day by day clear-sky midday value
Figures are averaged over 8 years of ERA5 reanalysis; sea temps come from ocean reanalysis, and UV is derived from solar elevation.
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Updated: 10:59 AM
Northern Ireland, United Kingdom · 7 weather points · Climate reference: Belfast (54.60°N, 5.93°W) · Europe/London