Simnas, Lithuania — Weather in September 2026

Monthly climate averages for Simnas, Lithuania. Based on 10-year ERA5 reanalysis data.

Cfb Oceanic
7.3 /10
Good

September is a good month in Simnas

Climate Overview

Simnas, Lithuania in September has mild conditions, with highs averaging 18.4°C (65°F) and noticeably cooler mornings.

This month falls at the beginning of Autumn.

Daily highs in September gradually drop from around 20°C (68°F) at the start to 16°C (60°F) by month's end.

Rainfall is heaviest during the middle of the month, while the first third tends to be drier.

Expect around 9.4h of sunshine at the start of September, decreasing to 7.1h by the end.

Wind speeds pick up through the month, from 15 km/h (9 mph) to 18 km/h (11 mph).

The warmest days tend to fall around the 10th, averaging 20.9°C (70°F).

Compared to August, this month is about 4°C cooler with 3 fewer rainy days. Temperatures begin dropping heading into October.

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Monthly September Averages

Temperature
18°C / 11°C
Feels Like
17°C / 9°C
Rain
9 days · 46 mm
Sunshine
8.2h / day
Humidity
76% — Humid
Wind
17 km/h
Wind Direction
SSW (194°)
Gusts
35 km/h
Daylight
12.7 h
Cloud Cover
59%
Clear Sky Days
3.8
UV Index
3.9 — Moderate
Dew Point
11°C — Comfortable
Moon Phase
Waxing Crescent · 11%

Climate Charts

Daily averages based on historical data (2016–2025)

Daily Temperature

28°C 24°C 20°C 16°C 12°C 8°C 4°C 151015202530
HighLow

Daily Precipitation

0 mm 2 mm 4 mm 6 mm 151015202530
Rainfall

Daily Sunshine

0h 3h 6h 9h 12h 151015202530
Sunshine

Daily Wind Speed

0 5 10 15 20 25 151015202530
Wind Speed
Sun Position
Sunrise 06:59
Daylight 12.8h
Sunset 19:45

Compare Months

January
Poor
Temp
0°C / -4°C
Feels Like
-4°C / -9°C
Rain
13days (51 mm) Wet
Sun
2h Poor
Humidity
87% Very Muggy
UV
0.8 Low
Snow Days
14days
View Details
February
Poor
Temp
2°C / -3°C
Feels Like
-2°C / -7°C
Rain
10days (39 mm) Wet
Sun
4.1h Fair
Humidity
82% Humid
UV
1.4 Low
Snow Days
10days
View Details
March
Poor
Temp
7°C / -1°C
Feels Like
2°C / -5°C
Rain
10days (35 mm) Wet
Sun
7h Good
Humidity
75% Muggy
UV
3 Moderate
Snow Days
6days
View Details
April
Fair
Temp
12°C / 3°C
Feels Like
9°C / 0°C
Rain
9days (44 mm) Wet
Sun
9.3h Good
Humidity
69% Muggy
UV
4.1 Moderate
Snow Days
2days
View Details
May best
Good
Temp
18°C / 8°C
Feels Like
16°C / 5°C
Rain
10days (53 mm) Wet
Sun
11.8h Excellent
Humidity
67% Muggy
UV
5.5 High
View Details
June best
Excellent
Temp
23°C / 13°C
Feels Like
22°C / 12°C
Rain
11days (66 mm) Wet
Sun
12.5h Excellent
Humidity
68% Muggy
UV
6 High
View Details
July best
Excellent
Temp
23°C / 15°C
Feels Like
23°C / 14°C
Rain
14days (97 mm) Wet
Sun
11.6h Excellent
Humidity
73% Muggy
UV
5.7 High
View Details
August best
Excellent
Temp
23°C / 15°C
Feels Like
23°C / 14°C
Rain
12days (70 mm) Wet
Sun
10.5h Excellent
Humidity
73% Muggy
UV
5 Moderate
View Details
September best
Good
Temp
18°C / 11°C
Feels Like
17°C / 9°C
Rain
9days (46 mm) Wet
Sun
8.2h Good
Humidity
76% Humid
UV
3.9 Moderate
View Details
October
Fair
Temp
12°C / 6°C
Feels Like
9°C / 3°C
Rain
12days (64 mm) Wet
Sun
4.8h Fair
Humidity
83% Humid
UV
2 Low
View Details
November
Poor
Temp
5°C / 2°C
Feels Like
2°C / -2°C
Rain
10days (43 mm) Wet
Sun
2.1h Poor
Humidity
87% Very Muggy
UV
1 Low
Snow Days
6days
View Details
December
Poor
Temp
2°C / -1°C
Feels Like
-2°C / -6°C
Rain
12days (50 mm) Wet
Sun
1.4h Poor
Humidity
89% Very Muggy
UV
0.6 Low
Snow Days
10days
View Details
Month Temp Feels Like Rain Sun Humidity UV Status
January 0°C / -4°C -4°C / -9°C 13days (51 mm) Wet 2h Poor 87% Very Muggy 0.8 Low Poor View Details
February 2°C / -3°C -2°C / -7°C 10days (39 mm) Wet 4.1h Fair 82% Humid 1.4 Low Poor View Details
March 7°C / -1°C 2°C / -5°C 10days (35 mm) Wet 7h Good 75% Muggy 3 Moderate Poor View Details
April 12°C / 3°C 9°C / 0°C 9days (44 mm) Wet 9.3h Good 69% Muggy 4.1 Moderate Fair View Details
May best 18°C / 8°C 16°C / 5°C 10days (53 mm) Wet 11.8h Excellent 67% Muggy 5.5 High Good View Details
June best 23°C / 13°C 22°C / 12°C 11days (66 mm) Wet 12.5h Excellent 68% Muggy 6 High Excellent View Details
July best 23°C / 15°C 23°C / 14°C 14days (97 mm) Wet 11.6h Excellent 73% Muggy 5.7 High Excellent View Details
August best 23°C / 15°C 23°C / 14°C 12days (70 mm) Wet 10.5h Excellent 73% Muggy 5 Moderate Excellent View Details
September best 18°C / 11°C 17°C / 9°C 9days (46 mm) Wet 8.2h Good 76% Humid 3.9 Moderate Good View Details
October 12°C / 6°C 9°C / 3°C 12days (64 mm) Wet 4.8h Fair 83% Humid 2 Low Fair View Details
November 5°C / 2°C 2°C / -2°C 10days (43 mm) Wet 2.1h Poor 87% Very Muggy 1 Low Poor View Details
December 2°C / -1°C -2°C / -6°C 12days (50 mm) Wet 1.4h Poor 89% Very Muggy 0.6 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 layerUmbrellaComfortable walking shoes

Frequently Asked Questions

September is typically good for visiting Simnas, with average highs of 18°C (65°F) and around 9 rainy days. Simnas, Lithuania in September has mild conditions, with highs averaging 18.4°C (65°F) and noticeably cooler mornings.
Simnas typically sees around 9 rainy days in September with 46 mm (1.8 in) of total rainfall. An umbrella should suffice.
Nights in Simnas during September are cool at around 11°C (52°F). Bring a jacket or sweater for evenings.
With highs of 18°C (65°F) and lows of 11°C (52°F) in September, we recommend: Warm evening layer, Umbrella, Comfortable walking shoes. Comfortable walking shoes are essential.
Yes, September offers some of the best weather conditions in Simnas with comfortable temperatures and lower chances of rain.
The average UV index in Simnas during September is 4 (moderate). Sunscreen and sunglasses are recommended during midday hours.
Simnas gets approximately 13 hours of daylight per day in September, with around 8 hours of sunshine.
Snow is uncommon in Simnas during September based on 10-year climate averages.

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