Verdict: Good month
Tallinn Weather in September
September is mild-to-cool in Tallinn, topping out near 16°C (61°F) — comfortable with a layer on. Expect showers on roughly 12 days of the month — rarely trip-ruining, worth planning around. Overall, September is a solid month to visit Tallinn.
Average high
16°C / 61°F
Average low
10°C / 50°F
Rain days
~12
Precipitation
58 mm
What to pack for Tallinn in September
- Layers — t-shirts under a light jacket or sweater
- Rain gear is non-negotiable — expect rain on roughly 12 days
- Comfortable walking shoes — every guide on this site assumes you'll use them
September against the rest of the year
Warmest in Tallinn: Jul (22°C / 72°F) · Coolest: Jan (0°C / 32°F) · Wettest: Jul (~17 rain days)
0°
-4°
Jan
0°
-4°
Feb
4°
-2°
Mar
8°
1°
Apr
15°
6°
May
21°
12°
Jun
22°
14°
Jul
21°
14°
Aug
16°
10°
Sep
11°
6°
Oct
5°
1°
Nov
0°
-4°
Dec
Daily highs / lows in °C · bars show rain days per month · ERA5 climate normals (2020–2024)