Monthly climate guide

Kaunas weather in September

With highs near 18°C (65°F) and lows around 9°C (48°F), September feels mild in Kaunas. Rainfall averages about 57 mm (some rain) and the sky is often cloudy. Daytime highs are 4°C cooler than August and 7°C warmer than October.

What stands out in September

It cools down fast from here: October is about 7°C cooler.
Seasonally, September counts as early autumn in Kaunas.

Avg high

18°C

65°F

Avg low

9°C

48°F

Rainfall

57 mm

some rain

Humidity

84%

relative

Sky

63%

cloud · often cloudy

Live Kaunas forecast Where else to go in September

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Kaunas weather by month

Low → high °C Rain (mm)

Show the monthly averages as a table

Average monthly climate in Kaunas
Month	Avg high	Avg low	Rain	Humidity	Cloud cover
January	-3°C / 27°F	-8°C / 18°F	58 mm	96%	87%
February	-1°C / 31°F	-7°C / 20°F	44 mm	95%	82%
March	5°C / 41°F	-3°C / 26°F	41 mm	87%	73%
April	12°C / 54°F	1°C / 34°F	48 mm	81%	61%
May	18°C / 65°F	7°C / 45°F	62 mm	78%	59%
June	21°C / 71°F	11°C / 52°F	81 mm	79%	63%
July	23°C / 73°F	13°C / 56°F	104 mm	82%	67%
August	23°C / 73°F	13°C / 55°F	79 mm	81%	61%
September	18°C / 65°F	9°C / 48°F	57 mm	84%	63%
October	11°C / 52°F	4°C / 39°F	64 mm	89%	72%
November	5°C / 41°F	1°C / 33°F	60 mm	95%	84%
December	1°C / 33°F	-3°C / 26°F	59 mm	96%	83%

What to pack for September

A warm sweater or fleece for layering
A mid-weight jacket
A small travel umbrella, just in case

Full season-by-season packing guide →

Is September a good time to visit Kaunas?

Compare the months in the chart above to find your ideal window.

Best time to visit Kaunas →

Other Lithuania cities in September

Vilnius

18° / 9°C · 54 mm

Klaipėda

18° / 12°C · 71 mm

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Kaunas weather in September. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/lithuania/kaunas/september

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Kaunas in September: quick answers

Is September a good time to visit Kaunas?

Yes. September is one of the best months for Kaunas, with highs around 18°C and about 57 mm of rain.

How warm is Kaunas in September?

Average highs are about 18°C (65°F) and average lows about 9°C (48°F), based on 10 years of daily data.

Does it rain a lot in Kaunas in September?

Kaunas typically gets around 57 mm of rain in September — some rain.

Figures are long-term averages for the area around Kaunas (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.