Haarlem Weather in September
September in Haarlem sees daytime temperatures around 19°C (66°F) and lows of 13°C (55°F) at night. With around 101 mm (4 in) of rainfall expected, it's worth packing a rain jacket.
Rainfall in Haarlem in September
Expect around 16 days of rain based on historical data, with 101 mm (4 in) average. This is a wet month with frequent and often heavy showers. Both the number of rain days and the total rainfall are high.
Temperature in Haarlem in September
Expect highs of 19°C (66°F) in Haarlem in September, with nights dropping to around 13°C (55°F). September is typically considered a summer month. 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 Haarlem in September
The month brings about 134 hours of sunlight, offering a comfortable mix of sun and overcast.Should you favor a climate that's both dry and comfortably warm, July typically offers the most agreeable circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.
Haarlem Temperature in September
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Haarlem Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Haarlem - and find the best time to visit.
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Haarlem 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 records for Haarlem in September
Browse day-by-day weather records for Haarlem spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Haarlem historical weather extremes in September
Based on 49 years of weather observations in Haarlem between 1976 and 2025, these are the recorded extremes.
- The hottest September day on record in Haarlem reached 31°C (88°F) (September 13, 2016).
- Haarlem experienced its chilliest September day on September 22, 1996, reaching only 11°C (52°F).
- Nighttime temperatures dropped to 2°C (36°F) on September 29, 1979, marking the coldest September night on record.
- The heaviest September precipitation occurred on September 8, 2017, when 42 mm (1.7 in) of precipitation fell.
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 is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Haarlem in September
For Haarlem 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 Haarlem in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Swimming6/10 -
Cycling9/10 -
Walking9/10 -
Camping6/10 -
Outdoor sports9/10
Haarlem 3-Day Forecast
See the full Haarlem climate overview or explore weather in the Netherlands.
Popular in September
Where to go in September - average daytime high across popular destinations.
Valkenburg
20°C (68°F) Utrecht20°C (68°F) Maastricht20°C (68°F) Noordwijk aan Zee
19°C (66°F) Rotterdam20°C (68°F) Zandvoort
19°C (66°F) The Hague20°C (68°F) Amsterdam19°C (66°F) 
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