Annual mean 11°C · wettest around April · prevailing wind SW
Warmest
27.6 °C
Coldest
-0.8 °C
Wettest
13%
Windiest
1.7 m/s
Prevailing
SW
1.1 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
never good
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Every reading
bars actual · line feels-like, °Cchance of rain, %wind speed, m/ssky covered, %
The average temperature in Ulster over the whole year is 11°C. July is the hottest month, with highs of about 27°C; January is the coldest, with lows of about -4°C. Ulster has no sharply defined rainy season: the chance of rain on a given day runs from 7% in August, the driest month, to 12% in April, the wettest. Winds in Ulster are highest in March, averaging 1.0 m/s (4 km/h), and lightest in July, at 0.4 m/s (1 km/h). The prevailing wind is from the SW. The clearest skies in Ulster come in July, when the sky is typically 42% covered; January is the cloudiest month, at 58%.
Month by month Ulster climate by month: average temperatures year round · click a month to read it
Month
High
Low
Feels like
Chance of rain
Cloud
Wind
Being outside
Sun
Walking
January
-0°C
-4°C
-3°C
8%
58%
0.9 m/s
1
0
5
February
2°C
-2°C
-1°C
10%
53%
0.9 m/s
2
0
12
March
7°C
1°C
3°C
9%
52%
1.0 m/s
4
0
29
April
13°C
6°C
10°C
12%
55%
1.0 m/s
26
3
65
May
19°C
11°C
19°C
9%
53%
0.6 m/s
62
20
68
June
24°C
16°C
26°C
8%
45%
0.5 m/s
61
45
36
July
27°C
20°C
30°C
7%
42%
0.4 m/s
29
65
7
August
26°C
18°C
29°C
7%
44%
0.4 m/s
42
64
15
September
22°C
15°C
23°C
8%
46%
0.4 m/s
72
34
51
October
16°C
9°C
15°C
8%
51%
0.5 m/s
50
5
81
November
8°C
3°C
6°C
8%
47%
0.8 m/s
12
1
39
December
3°C
-1°C
-0°C
12%
56%
0.8 m/s
0
0
12
High and low are the warmest and coolest of four readings a day — midnight, 6am, noon and 6pm — so a true overnight low can sit a degree or two under them. Chance of rain, cloud and wind are the day’s average; feels-like and the three ratings (each out of 100: Good from 55, Ideal from 80) are read at midday.
Seasons, and the year in short Ulster weather by season
Year round, Ulster has days of about -0°C at their warmest in January, its coolest month, and 27°C in July, its warmest; the coolest hours of the day run from -4°C to 20°C through the year, and the average temperature over the year is 11°C around the clock. Rain is most likely around April and least likely around August. Every figure here is a decade of observations blended into one representative year, so it reads as what this date is usually like, not a forecast for one particular day.
Ulster weather in winterDecember to February
High 2°CLow -2°CRain 10%
Winter in Ulster has typical daily highs of about 2°C and lows of about -2°C, with a 10% chance of rain on a given day.
Ulster weather in springMarch to May
High 13°CLow 6°CRain 10%
Spring in Ulster has typical daily highs of about 13°C and lows of about 6°C, with a 10% chance of rain on a given day.
Ulster weather in summerJune to August
High 26°CLow 18°CRain 7%
Summer in Ulster has typical daily highs of about 26°C and lows of about 18°C, with a 7% chance of rain on a given day.
Ulster weather in autumnSeptember to November
High 15°CLow 9°CRain 8%
Autumn in Ulster has typical daily highs of about 15°C and lows of about 9°C, with a 8% chance of rain on a given day.
When is the rainy season in Ulster?
Ulster has no sharply defined rainy season: the chance of rain on a given day runs from 7% in August, the driest month, to 12% in April, the wettest.
What time of year is Ulster windiest?
Winds in Ulster are highest in March, averaging 1.0 m/s (4 km/h), and lightest in July, at 0.4 m/s (1 km/h). The prevailing wind is from the SW.
What is the average temperature in Ulster year round?
The average temperature in Ulster over the whole year is 11°C. July is the hottest month, with highs of about 27°C; January is the coldest, with lows of about -4°C.