Mariehamn in Fall
In fall (September, October and November), Mariehamn sees average daytime highs around 10°C and overnight lows near 8°C, with 176 mm of precipitation over about 34 wet days across the season. It is the 2nd-warmest season and the wettest season of the year.
Over the season highs ease from about 16°C in early September to 5°C by late November. The sky is clear or mostly clear about 19% of the time across fall, and the air most often feels dry.
Fall is Mariehamn's 2nd-best season to visit on our travel score. For the whole year in context, see Mariehamn's year-round climate.
- Avg daytime high
- 10°C
- 2nd-warmest season
- Avg overnight low
- 8°C
- Precipitation
- 176 mm
- 34 wet days
- Avg wind
- 27 km/h
- Travel score
- 2.1
- 2nd-best season
- Months
- Sep · Oct · Nov
Temperature in Mariehamn in Fall
Over the season highs ease from about 16°C in early September to 5°C by late November.
A typical fall day in Mariehamn reaches about 10°C and drops to 8°C overnight. The warmest of the three months is September, the coolest November.
How fall really feels in Mariehamn
Once humidity and wind are folded in, fall brings about 0 days that feel above 32°C and 23 that feel at or below 0°C.
The story in fall is cold — wind chill drags the overnight "feels like" below the raw low.
Mariehamn weather by month
How the three fall months (September, October and November) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 2° / -1° | 43 | 10.5 | 8 | 6.4 | 0.0 |
| Feb | 0° / -2° | 29 | 7.7 | 6.5 | 8.6 | 0.0 |
| Mar | 1° / -1° | 27 | 7.1 | 5.1 | 11.3 | 0.0 |
| Apr | 4° / 2° | 29 | 6.9 | 1.7 | 14.2 | 0.0 |
| May | 8° / 6° | 33 | 6.6 | 0.2 | 16.8 | 1.6 |
| Jun | 13° / 11° | 49 | 7.5 | 0 | 18.4 | 3.8 |
| Jul | 17° / 15° | 48 | 7.6 | 0 | 17.7 | 5.9 |
| Aug | 18° / 16° | 55 | 10.2 | 0 | 15.4 | 5.8 |
| Sep | 14° / 13° | 54 | 9.2 | 0 | 12.6 | 4.1 |
| Oct | 9° / 8° | 62 | 11.8 | 0.4 | 9.8 | 1.9 |
| Nov | 6° / 4° | 60 | 13 | 2.9 | 7.1 | 0.4 |
| Dec | 3° / 1° | 56 | 13 | 6.1 | 5.6 | 0.0 |
Cloud cover in Fall
The sky is clear or mostly clear about 19% of the time across fall.
Chance of precipitation in Fall
Mariehamn gets around 176 mm of rain and snow over 34 wet days across fall. The line is the day-by-day chance of measurable precipitation.
Humidity in Fall
Most of fall feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Fall
Winds average 27 km/h across fall.
Sunrise & sunset in Fall
Daylight runs from about 13 h 54 min in early September to 6 h 06 min by late November. The lit band spans sunrise to sunset each day.
Solar energy in Fall
Average shortwave solar energy reaching the ground each day across fall, about 1.5 kWh/m².
Is fall a good time to visit Mariehamn?
Our two travel scores rate fall for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
fall is a weaker month for outdoor sightseeing in Mariehamn.
What to pack for Mariehamn in Fall
From fall's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In fall, Mariehamn sees daytime highs around 10°C and nights near 8°C. Pack a warm layer and a windbreaker. Worth having: a heavy coat and rain gear. About 34 days see rain.
Sea temperature near Mariehamn in Fall
The nearest coast averages about 10°C across fall — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea offshore is warmest in August at about 17°C and coldest in February near 1°C.
The water stays below 20°C all year — cool enough that most swimmers want a wetsuit.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 2 | 1 | 1 | 3 | 6 | 11 | 16 | 17 | 14 | 10 | 7 | 4 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Cool | Cool | Bracing | Bracing | Bracing | Bracing |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 2 | Bracing |
| Feb | 1 | Bracing |
| Mar | 1 | Bracing |
| Apr | 3 | Bracing |
| May | 6 | Bracing |
| Jun | 11 | Bracing |
| Jul | 16 | Cool |
| Aug | 17 | Cool |
| Sep | 14 | Bracing |
| Oct | 10 | Bracing |
| Nov | 7 | Bracing |
| Dec | 4 | Bracing |
UV index in Mariehamn in Fall
Clear-sky midday UV across fall averages around 1. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Mariehamn peaks around June 18 at about 5 (high) — a little sun protection helps at midday. It bottoms out near December 20 at about 0 (low).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 4 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 0 | 1 | 1 | 3 | 4 | 5 | 5 | 4 | 3 | 1 | 0 | 0 |
| Level | Low | Low | Low | Moderate | Moderate | High | Moderate | Moderate | Moderate | Low | Low | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 0 | Low |
| Feb | 1 | Low |
| Mar | 1 | Low |
| Apr | 3 | Moderate |
| May | 4 | Moderate |
| Jun | 5 | High |
| Jul | 5 | Moderate |
| Aug | 4 | Moderate |
| Sep | 3 | Moderate |
| Oct | 1 | Low |
| Nov | 0 | Low |
| Dec | 0 | Low |
Where is Mariehamn?
Mariehamn sits at 60.1°N, 19.9°E, 11 m above sea level, in Aland Islands. The nearest listed city is Norrtälje, 78 km away.
Topography around Mariehamn
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Mariehamn.
Within 3 km, the terrain around Mariehamn has only modest variations in elevation — a maximum elevation change of 55 m around an average of 7 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 80 m; within 80 km, only modest variations in elevation — a maximum elevation change of 130 m.
The land around Mariehamn is covered by water (44%) and trees (32%) within 3 km, water (55%) and trees (31%) within 16 km, and water (86%) within 80 km.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Mariehamn (60.0973°, 19.9348°, elevation 11 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google.