Climate averages 1991–2020

Alkmaar weather
in May.

A cool, moderately wet month: the 5th warmest and the 3rd driest of the year.

Long-term climate patterns, not a forecast for a particular trip.

Average high 14.6°C Daytime mean, May

Average low 10.0°C Night-time mean, May

Rainfall 50 mm 10 days with ≥1 mm

Daylight 16 h Sunrise to sunset, per day

May is a cool month in Alkmaar: daytime highs average 14.6°C and nights cool to about 10.0°C. By daytime temperature it is the 5th warmest of the 12 months.

Expect about 50 mm of rain on roughly 10 days, which makes May a moderately wet month (the 3rd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 15 h 44 min on an average May day.

The nearest other city in this atlas is Purmerend (20 km away). In May its highs average 16.1°C, 1.5°C warmer than Alkmaar, with 58 mm of rain.

Among the 44 cities listed in the Netherlands, Alkmaar ranks 44th of 44 for the warmest May highs and 1st of 44 for the driest May (rainfall, lowest first). The mean May high of those 44 cities is 16.9°C; Alkmaar is 2.3°C cooler than that mean.

From May to June, average highs rise by 2.6°C to 17.2°C, and monthly rainfall rises from 50 mm to 55 mm.

The annual picture

May in context

30-year average

Average highAverage low°C

Monthly rainfall

Average total · mm

Averages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated

Every month, side by side

Alkmaar climate table

1991–2020

Monthly climate averages for Alkmaar, 1991–2020
Month	Average highHigh / low	Average low	Rainfall mm/month	Rain days ≥1 mm/day	Daylight hours/dayDaylight h/day
January	5.9°C2.9°C	2.9°C	68	13.4	8.28 h
February	6.0°C2.7°C	2.7°C	53	10.9	9.810 h
March	8.2°C4.2°C	4.2°C	49	10.5	11.812 h
April	11.4°C6.6°C	6.6°C	37	8.8	13.914 h
May, selected	14.6°C10.0°C	10.0°C	50	9.6	15.716 h
June	17.2°C12.9°C	12.9°C	55	10.3	16.817 h
July	19.5°C15.3°C	15.3°C	67	11.8	16.316 h
August	19.9°C15.7°C	15.7°C	84	12.8	14.715 h
September	17.4°C13.7°C	13.7°C	82	12.6	12.713 h
October	13.8°C10.4°C	10.4°C	91	14.4	10.711 h
November	9.8°C6.8°C	6.8°C	79	15.5	8.89 h
December	6.9°C4.0°C	4.0°C	79	14.5	7.78 h

Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.

Compare places

May in nearby cities

Distance from Alkmaar

Read the numbers correctly

Climate, not a promise.

These patterns help compare months. They cannot tell you the weather on a specific day of your trip.

Sources, method and limits

How these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Alkmaar) is explained once on the Alkmaar year overview and on the Sources, method and limits page.