The Weather Network
Weather
Maps
News
Video
|
Welcome
Monthly
⋮
Current
Hourly
7 Days
14 Days
Weekend
Monthly
Precipitation
Temperature
Wind
Temperature Unit Selection
°Celsius
°Fahrenheit
Monthly Historical Averages
Harpenden, UKH
Content continues below
May
Average Temperature
High
16°
Feels 15
Low
7°
Feels 5
Average Precipitation
12 Days
Rain amount
53.9mm
Snow amount
0cm
Content continues below
Daily Historical Averages
May 2026
S
M
T
W
T
F
S
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
15°
19
17°
20
18°
21
22°
22
25°
23
23°
24
23°
25
24°
26
24°
27
24°
28
21°
29
20°
30
19°
31
18°
Forecast
Monday, May 18, 2026
Day
15°
Feels 13
Wind
23 km/h SW
Gust
34 km/h
Humidity
57%
P.O.P
90%
Rain
2-4 mm
Night
8°
Feels 5
Wind
23 km/h S
Gust
35 km/h
Humidity
97%
P.O.P
90%
Rain
~5 mm
Historical Averages
May 18
High
Feels
Low
Feels
Precip Frequency
Total Daylight
Humidity
Historical Averages are based on data recorded from 2000 onwards.