Annual mean 11°C · wettest around November · prevailing wind SW
Warmest
21.5 °C
Coldest
5.3 °C
Wettest
55%
Windiest
8.1 m/s
Prevailing
SW
6.9 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
never good
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 Heiloo over the whole year is 11°C. August is the hottest month, with highs of about 21°C; February is the coldest, with lows of about 4°C. The rainy (wet) season in Heiloo runs from October to March, peaking in November with a 53% chance of rain on a given day. The dry season is April to September; May is the driest month, at 27%. Winds in Heiloo are highest in February, averaging 7.5 m/s (27 km/h), and lightest in May, at 5.7 m/s (21 km/h). The prevailing wind is from the SW. The clearest skies in Heiloo come in August, when the sky is typically 50% covered; December is the cloudiest month, at 74%.
Month by month Heiloo 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
6°C
4°C
-0°C
48%
72%
7.4 m/s
0
0
5
February
7°C
4°C
0°C
47%
65%
7.5 m/s
0
0
11
March
9°C
5°C
3°C
42%
58%
6.5 m/s
2
0
22
April
12°C
7°C
6°C
35%
53%
6.1 m/s
8
0
48
May
16°C
11°C
12°C
27%
51%
5.7 m/s
31
1
73
June
19°C
14°C
16°C
27%
51%
5.8 m/s
59
8
76
July
20°C
16°C
18°C
29%
53%
5.7 m/s
68
9
75
August
21°C
17°C
18°C
31%
50%
5.7 m/s
70
12
71
September
19°C
14°C
16°C
38%
54%
5.7 m/s
56
6
77
October
14°C
11°C
10°C
44%
63%
6.8 m/s
14
0
69
November
10°C
7°C
4°C
53%
67%
7.0 m/s
0
0
31
December
7°C
6°C
1°C
53%
74%
7.3 m/s
0
0
11
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 Heiloo weather by season
Year round, Heiloo has days of about 6°C at their warmest in January, its coolest month, and 21°C in August, its warmest; the coolest hours of the day run from 4°C to 17°C through the year, and the average temperature over the year is 11°C around the clock. Rain is most likely around November and least likely around May. 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.
Heiloo weather in winterDecember to February
High 7°CLow 5°CRain 49%
Winter in Heiloo has typical daily highs of about 7°C and lows of about 5°C, with a 49% chance of rain on a given day.
Heiloo weather in springMarch to May
High 12°CLow 8°CRain 35%
Spring in Heiloo has typical daily highs of about 12°C and lows of about 8°C, with a 35% chance of rain on a given day.
Heiloo weather in summerJune to August
High 20°CLow 16°CRain 29%
Summer in Heiloo has typical daily highs of about 20°C and lows of about 16°C, with a 29% chance of rain on a given day.
Heiloo weather in autumnSeptember to November
High 14°CLow 11°CRain 45%
Autumn in Heiloo has typical daily highs of about 14°C and lows of about 11°C, with a 45% chance of rain on a given day.
When is the rainy season in Heiloo?
The rainy (wet) season in Heiloo runs from October to March, peaking in November with a 53% chance of rain on a given day. The dry season is April to September; May is the driest month, at 27%.
What time of year is Heiloo windiest?
Winds in Heiloo are highest in February, averaging 7.5 m/s (27 km/h), and lightest in May, at 5.7 m/s (21 km/h). The prevailing wind is from the SW.
What is the average temperature in Heiloo year round?
The average temperature in Heiloo over the whole year is 11°C. August is the hottest month, with highs of about 21°C; February is the coldest, with lows of about 4°C.