Uster, Switzerland — Weather in September 2026

Climate Overview

Uster, Switzerland in September has mild conditions, with highs averaging 19.8°C (68°F) and noticeably cooler mornings. Rain falls on about 14 days this month.

This month falls at the beginning of Autumn.

Daily highs in September gradually drop from around 22°C (71°F) at the start to 17°C (63°F) by month's end.

September sees fairly even rainfall, totalling about 127 mm across the month.

Expect around 9.7h of sunshine at the start of September, decreasing to 8.1h by the end.

The warmest days tend to fall around the 5th, averaging 22°C (72°F).

Compared to August, this month is about 4°C cooler with 0 fewer rainy days. Temperatures begin dropping heading into October.

Monthly September Averages

Temperature

20°C / 12°C

Feels Like

20°C / 11°C

Rain

14 days · 129 mm

Sunshine

9.1h / day

Humidity

81% — Very Humid

Wind

9 km/h

Wind Direction

SSE (158°)

Gusts

27 km/h

Daylight

12.5 h

Cloud Cover

60%

Clear Sky Days

3.2

UV Index

4.2 — Moderate

Dew Point

13°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 07:03

Daylight 12.6h

Sunset 19:40

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 / -1°C	2°C / -5°C	15days (131 mm) Wet	5.5h Fair	83% Humid	1.5 Low	Poor	View Details
February	8°C / -1°C	5°C / -4°C	12days (89 mm) Wet	6.8h Fair	79% Humid	2.2 Moderate	Poor	View Details
March	11°C / 1°C	8°C / -2°C	14days (97 mm) Wet	8.5h Good	76% Humid	3.4 Moderate	Poor	View Details
April	14°C / 4°C	13°C / 1°C	14days (111 mm) Wet	10.2h Excellent	74% Muggy	4.9 Moderate	Fair	View Details
May	18°C / 8°C	17°C / 6°C	19days (170 mm) Wet	10.3h Excellent	77% Humid	5.6 High	Wet	View Details
June best	23°C / 13°C	24°C / 13°C	16days (168 mm) Wet	11.7h Excellent	75% Muggy	6.5 High	Excellent	View Details
July best	24°C / 15°C	25°C / 16°C	16days (145 mm) Wet	11.7h Excellent	74% Muggy	6.4 High	Excellent	View Details
August best	24°C / 15°C	26°C / 16°C	14days (160 mm) Wet	10.5h Excellent	76% Humid	5.6 High	Excellent	View Details
September best	20°C / 12°C	20°C / 11°C	14days (129 mm) Wet	9.1h Good	81% Humid	4.2 Moderate	Excellent	View Details
October best	16°C / 7°C	15°C / 6°C	13days (108 mm) Wet	7.2h Good	83% Humid	2.8 Moderate	Good	View Details
November	9°C / 2°C	7°C / 0°C	14days (104 mm) Wet	5.7h Fair	85% Humid	1.6 Low	Poor	View Details
December	6°C / 0°C	4°C / -3°C	15days (121 mm) Wet	4.9h Fair	85% Humid	1.2 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 jacketWaterproof shoes

Frequently Asked Questions

Expand all

Is September a good time to visit Uster?

September is typically excellent for visiting Uster, with average highs of 20°C (68°F) and around 14 rainy days. Uster, Switzerland in September has mild conditions, with highs averaging 19.8°C (68°F) and noticeably cooler mornings.

Does it rain a lot in Uster in September?

Uster typically sees around 14 rainy days in September with 129 mm (5.1 in) of total rainfall. Pack a waterproof jacket.

Does it get cold at night in Uster in September?

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

What should I pack for Uster in September?

With highs of 20°C (68°F) and lows of 12°C (53°F) in September, we recommend: Warm evening layer, Umbrella, Waterproof jacket, Waterproof shoes. Comfortable walking shoes are essential.

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

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

What is the UV index in Uster in September?

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

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

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

Does it snow in Uster in September?

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

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