Alkmaar Weather in September
September in Alkmaar averages 19°C (66°F) during the day and 13°C (55°F) at night. Quite a bit of rainfall is typical this month, with around 95 mm (3.7 in) on average. An umbrella is a good idea.
Rainfall in Alkmaar in September
Historically, September sees about 16 days of rain, with a monthly average of 95 mm (3.7 in). Expect a fairly normal spread of rainfall this month, with no particular pattern of very heavy or very persistent showers.
Temperature in Alkmaar in September
Expect highs of 19°C (66°F) in Alkmaar in September, with nights dropping to around 13°C (55°F). This month falls in the summer season. Temperatures can feel cooler in the morning and evening, so layering is often the best approach. With lows of 13°C (55°F), nights are cool. If you're out after dark, an extra layer will keep you comfortable. The cooler air at night is also great for getting a good rest.
Sunshine in Alkmaar in September
The month experiences a moderate amount of sunlight, with 141 hours of sunshine. This provides a nice balance between sunshine and clouds.Our weather planner can help you find worldwide destinations with pleasant weather during this period. July and August typically offer the best weather for Alkmaar.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the Netherlands, check out our Alkmaar's climate page.
Alkmaar Temperature in September
Min Temperature
13°C (55°F)
Max Temperature
19°C (66°F)
Chance of Rain
53%
Precipitation
95 mm (3.7 in)
Rainy days
16 days
Humidity
81% *
Sunshine
141 hours *
Percentage Sunshine
37% *
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Alkmaar typically stay consistent throughout September, with daily highs averaging around 19°C (66°F). Nights are cool, with lows typically ranging from 10°C (50°F) to 13°C (55°F).
Average temperatures in September
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather for Alkmaar in September
Browse day-by-day weather records for Alkmaar spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Alkmaar historical weather extremes in September
Based on weather observations in Alkmaar between 1976 and 2025, these are the recorded extremes during September.
- On September 13, 2016, temperatures climbed to 30°C (86°F), marking the warmest September day on record.
- The coldest September day was on September 13, 1998, with a maximum of 11°C (52°F).
- Nighttime temperatures dropped to 3°C (37°F) on September 29, 1979, marking the coldest September night on record.
Best Places in the Netherlands in September
Find out more about the weather in the Netherlands and which places have the best travel conditions in this month. See all of the Netherlands in September →
perfect weather
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tolerable
unpleasant
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What to Wear in Alkmaar in September
For Alkmaar in September, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. High rain levels are expected, so pack waterproof gear and an umbrella or poncho. Sunglasses could come in handy during the sunnier parts of your trip.What To Do in Alkmaar in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the Netherlands, check out our Alkmaar's climate page.
Temperature Rainfall Sunshine Humidity
See the full Alkmaar climate overview or explore weather in the Netherlands.
