Climate Chart of Belfast, Great Britain

Monthly data: Temperature °C, Rain (mm), Sunshine (h) · 2013–2023

For Belfast, Great Britain, the climate data describe 2013–2023. Monthly mean temperatures range from January at 5.5 °C to July at 15.6 °C, giving a broad sense of the annual temperature pattern without describing daytime highs or conditions on any particular day. Rainfall, sunshine and snowfall each have their own monthly pattern, so a visit planned around one priority may not align with another. The figures are averages, not guarantees of what visitors will experience.

Climate overview

Temperature

January has the lowest monthly mean temperature, 5.5 °C, while July has the highest, 15.6 °C. These figures describe monthly means rather than daytime maximum temperatures, and do not indicate how much temperatures may vary from day to day. Across the calendar-month means, the unweighted mean is 10.1 °C. It summarizes those monthly averages; it is not a day-weighted annual average or a forecast for a particular visit.

Rain

Mean daily rainfall is highest in October, at 3.13 mm/day, and lowest in April, at 1.79 mm/day. These are average daily amounts, not monthly totals, and the lower monthly mean does not guarantee dry days or show how frequently rain falls. The unweighted mean across the monthly mean daily rainfall figures is 2.70 mm/day. It provides a broad reference for the year, but cannot describe the timing or intensity of rain during an individual stay.

Sunshine

Mean daily sunshine reaches its highest level in June, at 10.36 hours/day, and its lowest in December, at 2.60 hours/day. These averages can help with planning outdoor time, but sunshine duration is not the same as day length and does not promise clear skies on a given day. The unweighted mean of the monthly mean daily sunshine figures is 6.84 hours/day. Treat it as an overview of the monthly averages rather than a measure of the sunshine a particular visitor will receive.

Snow

Mean daily snowfall is highest in March, at 1.78 mm/day; the unweighted mean across the monthly figures is 0.37 mm/day. These snowfall averages do not reveal the number of snowy days, snow depth or snow cover, and cannot establish whether conditions are suitable for skiing.

Best Travel Time Guide for Belfast, Great Britain: Ideal Seasons and Weather Insights

If cooler monthly mean temperatures are your priority, January is the reference point, with a mean of 5.5 °C. For visitors prioritising lower average rainfall, April is the conditional option: its mean daily rainfall is 1.79 mm/day, though that does not guarantee dry weather or quantify how often rain falls. For rain preparation, note that mean daily rainfall is highest in October, at 3.13 mm/day; packing for changeable conditions is more useful than treating an average as a forecast. If longer average sunshine is important for outdoor sightseeing, June records 10.36 hours/day of mean daily sunshine, while December records 2.60 hours/day. Sunshine duration is not day length, and neither figure guarantees conditions on your travel dates.

Snowfall averages are another limited planning guide: March has the highest mean daily snowfall at 1.78 mm/day. This does not establish how many snowy days to expect, whether snow will lie, or whether winter activities will be possible, so use it as context rather than a promise of snow conditions.

Climate Data Overview for Belfast, Great Britain

Explore the comprehensive climate data for Belfast, Great Britain. This detailed table provides valuable insights into temperature variations, precipitation levels, and seasonal changes, helping you understand the unique weather patterns of this region.

Month	Average: Temperature °C	Rain (mm) / day	Snow (mm) / day	Sunshine (h) / day
Jan	5.5	2.43	0.84	3.29
Feb	5.8	2.75	1.14	5.13
Mar	6.4	2.24	1.78	6.54
Apr	8.2	1.79	0.29	8.82
May	11.2	2.45	0.02	10.03
Jun	14.2	2.73	0.00	10.36
Jul	15.6	2.96	0.00	9.78
Aug	15.2	3.07	0.00	8.95
Sep	13.7	2.66	0.00	7.28
Oct	11.3	3.13	0.00	5.33
Nov	8.0	3.03	0.01	4.00
Dec	6.6	3.11	0.34	2.60
Average	10.1	2.70	0.37	6.84