Stembert, Belgium — Weather in September 2026

Climate Overview

Stembert, Belgium in September has mild conditions, with highs averaging 19.1°C (66°F) and noticeably cooler mornings. Rain falls on about 12 days this month.

This month falls at the beginning of Autumn.

Daily highs in September gradually drop from around 21°C (70°F) at the start to 16°C (62°F) by month's end.

September sees fairly even rainfall, totalling about 84 mm across the month.

Expect around 9.8h of sunshine at the start of September, decreasing to 7.8h by the end.

Wind speeds pick up through the month, from 16 km/h (10 mph) to 19 km/h (12 mph).

The warmest days tend to fall around the 5th, averaging 21.5°C (71°F).

Compared to August, this month is about 3°C cooler with 2 fewer rainy days. Temperatures begin dropping heading into October.

Monthly September Averages

Temperature

19°C / 12°C

Feels Like

18°C / 10°C

Rain

12 days · 84 mm

Sunshine

8.8h / day

Humidity

78% — Humid

Wind

18 km/h

Wind Direction

SSW (210°)

Gusts

37 km/h

Daylight

12.6 h

Cloud Cover

62%

Clear Sky Days

3.2

UV Index

4.1 — Moderate

Dew Point

12°C — Comfortable

Moon Phase

Waxing Crescent · 11%

Climate Charts

Daily averages based on historical data (2016–2025)

Daily Temperature

HighLow

Daily Precipitation

Rainfall

Daily Sunshine

Sunshine

Daily Wind Speed

Wind Speed

Sun Position

Sunrise 07:13

Daylight 12.7h

Sunset 19:54

What to Expect

Keep afternoons flexible as tropical showers are common — they typically clear within an hour.

Wet weather can spread across much of the day, so it is best to keep outdoor plans flexible.

1 of the last 5 yearly records were warmer than this month's long-run average.

Compare Months

Month	Temp	Feels Like	Rain	Sun	Humidity	UV	Status	Details
January	5°C / 0°C	0°C / -4°C	17days (121 mm) Wet	3.3h Poor	89% Very Muggy	1.1 Low	Poor	View Details
February	7°C / 1°C	3°C / -3°C	14days (91 mm) Wet	5.2h Fair	83% Humid	1.7 Low	Poor	View Details
March	10°C / 2°C	6°C / -2°C	14days (91 mm) Wet	7.2h Good	78% Humid	3.5 Moderate	Poor	View Details
April	13°C / 4°C	10°C / 1°C	13days (69 mm) Wet	9.9h Good	74% Muggy	4.5 Moderate	Fair	View Details
May best	17°C / 8°C	16°C / 6°C	13days (91 mm) Wet	10.8h Excellent	73% Muggy	5.7 High	Good	View Details
June best	21°C / 13°C	21°C / 11°C	14days (108 mm) Wet	11.5h Excellent	73% Muggy	6.2 High	Excellent	View Details
July best	22°C / 14°C	22°C / 13°C	15days (96 mm) Wet	11.4h Excellent	72% Muggy	5.9 High	Good	View Details
August best	23°C / 14°C	22°C / 14°C	14days (81 mm) Wet	10.5h Excellent	74% Muggy	5.6 High	Excellent	View Details
September best	19°C / 12°C	18°C / 10°C	12days (84 mm) Wet	8.8h Good	78% Humid	4.1 Moderate	Good	View Details
October	15°C / 9°C	12°C / 6°C	14days (92 mm) Wet	5.5h Fair	84% Humid	2.4 Moderate	Fair	View Details
November	9°C / 4°C	6°C / 1°C	15days (80 mm) Wet	4.1h Fair	87% Very Muggy	1.3 Low	Poor	View Details
December	6°C / 2°C	3°C / -2°C	17days (105 mm) Wet	2.8h Poor	89% Very Muggy	0.9 Low	Poor	View Details

What to Wear

Dress in layers — a mix of long sleeves, light sweaters, and a versatile jacket works best for changeable conditions.

A waterproof jacket or compact umbrella is recommended for occasional showers.

Packing List

Warm evening layerUmbrellaWaterproof jacketComfortable walking shoes

Frequently Asked Questions

Expand all

Is September a good time to visit Stembert?

September is typically good for visiting Stembert, with average highs of 19°C (66°F) and around 12 rainy days. Stembert, Belgium in September has mild conditions, with highs averaging 19.1°C (66°F) and noticeably cooler mornings. R

Does it rain a lot in Stembert in September?

Stembert typically sees around 12 rainy days in September with 84 mm (3.3 in) of total rainfall. Pack a waterproof jacket.

Does it get cold at night in Stembert in September?

Nights in Stembert during September are cool at around 12°C (53°F). Bring a jacket or sweater for evenings.

What should I pack for Stembert in September?

With highs of 19°C (66°F) and lows of 12°C (53°F) in September, we recommend: Warm evening layer, Umbrella, Waterproof jacket, Comfortable walking shoes. Comfortable walking shoes are essential.

Is September among the best months weather-wise in Stembert?

Yes, September offers some of the best weather conditions in Stembert with comfortable temperatures and lower chances of rain.

What is the UV index in Stembert in September?

The average UV index in Stembert during September is 4 (moderate). Sunscreen and sunglasses are recommended during midday hours.

How many hours of daylight are there in Stembert in September?

Stembert gets approximately 13 hours of daylight per day in September, with around 9 hours of sunshine.

Does it snow in Stembert in September?

Snow is uncommon in Stembert during September based on 10-year climate averages.

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