Mariehamn weather in July
In July, Mariehamn has daytime highs averaging 19 °C, nights around 15 °C, with 8.3 wet days, and a sea temperature of 16 °C. Figures are 1991–2020 climate normals.
- 18.6°C Average high
- 14.8°C Average low
- 8.3days Wet days
- 52mm Rainfall
- 15.5°C Sea temperature
- 18h Daylight
Daily temperatures through July
How July develops
Averages for the first, middle and last part of the month, from daily 1991–2020 normals. Chance of rain is the share of years in which that calendar day recorded more than 1 mm.
| Days | Avg high | Avg low | Chance of rain |
|---|---|---|---|
| 1–10 July | 17.6 °C | 13.8 °C | 24 % |
| 11–20 July | 18.5 °C | 14.7 °C | 30 % |
| 21–31 July | 19.4 °C | 15.8 °C | 28 % |
- Average highs rise from 17.6 °C early in July to 19.4 °C by the end of it.
- Rain is most likely over days 11–20 of July (30 % of days) and least likely over days 1–10 (24 %).
What to expect
| Measure | Typical July | Share of the month |
|---|---|---|
| Days above 25 °C | 0.6 of 31 | 2 % |
| Days above 30 °C | 0 of 31 | 0 % |
| Days below 0 °C | 0 of 31 | 0 % |
| Days with more than 1 mm rain | 8.3 of 31 | 27 % |
Conditions in July
| Measure | Average |
|---|---|
| Mean temperature | 17 °C |
| Record high (1991–2020) | 30 °C |
| Record low (1991–2020) | 7.7 °C |
| Relative humidity | 78 % |
| Wind speed | 21 km/h |
| Cloud cover | 52 % |
Where Mariehamn ranks in July
| Ranking | Position | Value |
|---|---|---|
| The coolest places in Europe in July | 19thof 50 | 19 °C |
July compared with the months around it
| Month | Avg high | Rainfall | Cloud |
|---|---|---|---|
| May | 10.1 °C | 36 mm | 52 % |
| June | 14.7 °C | 50 mm | 54 % |
| July | 18.6 °C | 52 mm | 52 % |
| August | 18.4 °C | 55 mm | 57 % |
| September | 14.3 °C | 47 mm | 60 % |
See all twelve months for Mariehamn
- July is the warmest month in Mariehamn.
- It is the 11th driest month of the year.
- It ranks 2nd for least cloud cover.
- Days last about 18 hours from sunrise to sunset.
- It rains on 8.3 of 31 days — 27 % of the month.
- Nights are about 3.8 °C cooler than the middle of the day.
- The hottest July day on record since 1991 reached 30 °C, 11 °C above the usual daytime high.
- Beach score: 35 / 100 — see how this is calculated.
Nearby destinations in July
| Destination | Avg high | Wet days | Sea |
|---|---|---|---|
| Mariehamn | 19 °C | 8.3 | 16 |
| Uppsala | 22 °C | 11 | – |
| Stockholm | 21 °C | 10 | 16 |
| Turku | 22 °C | 12 | – |
| Tampere | 21 °C | 13 | – |
QuestionsJuly in Mariehamn, answered
How warm is Mariehamn in July?
Daily highs average 19 °C and nights fall to about 15 °C, a spread of 3.8 °C between afternoon and dawn. That makes July the 2nd warmest month of the year here.
Does it rain much in Mariehamn in July?
July averages 52 mm of rain, spread over about 8 of the 31 days — 27 % of the month. Cloud cover averages 52 % of the sky.
Is the sea warm enough to swim in July?
The sea averages 16 °C off Mariehamn in July. Most people find water below 20 °C bracing and above 25 °C comfortable for a long swim; this figure is a monthly surface average, so a sheltered bay on a still afternoon can be warmer.
How long are the days in July?
Mariehamn averages 18 hours between sunrise and sunset in July. Day length is computed from latitude and date, so it is exact rather than modelled — but it says nothing about how much of that time is sunny.
Data sources and method
- ERA5 / ERA5-Land reanalysis — Copernicus Climate Change Service (C3S), ECMWF. Copernicus Licence
- Open-Meteo — Open-Meteo.com. CC BY 4.0
- NOAA OISST v2.1 — NOAA Physical Sciences Laboratory. Public domain
- GeoNames — GeoNames.org. CC BY 4.0
- Normal period
- 1991–2020
- Dataset version
- era5-1991-2020-scores1.1
- Last processed
Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: daylight hours, beach and comfort scores, monthly rankings, threshold day counts, chance of a wet day by date, ten-day averages within the month. Full formulas are on the methodology page.
Contains modified Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.