79 places · sun position · panel angle
Solar data for Finland
Across the 79 places in Finland the best fixed tilt for solar panels runs from 43° in Turku to 49° in Rovaniemi, and flat ground gets 2.3 to 2.7 peak sun hours a day. Every number is computed for each place.
Solar power in Finland at a glance
Averages over 79 places with climate data, for a fixed array facing south.
- 2.25–2.35
- 2.35–2.45
- 2.45–2.55
- 2.55–2.65
- 2.65–2.75
Peak sun hours a day on flat ground. Each dot is one place.
The sunniest place in Finland is Rauma (Satakunta) with 2.75 peak sun hours a day on flat ground; the least sunny is Rovaniemi with 2.25. A 1 kWp array at its best angle makes from 914 kWh a year in Rovaniemi to 1,058 kWh in Rauma — 983 kWh on average.
The best year-round tilt runs from 43° in Turku to 49° in Rovaniemi. Off-grid systems are sized for the darkest month and do better steeper, at 75° on average: at 70° that month brings 0.00 kWh per kWp a day in Rovaniemi and 0.39 kWh in Helsinki.
Size an off-grid system or open any place below for its sun path, monthly table and tilt curve.
Sunniest places in Finland
Ranked by peak sun hours on flat ground: the yearly average of a day's sunshine energy (NASA POWER climatology). Output: 1 kWp at its best year-round angle.
| Rank | Place | Region | Sun hours/day | kWh per kWp a year | Best tilt |
|---|---|---|---|---|---|
| 1 | Rauma | Satakunta | 2.75 | 1,058 | 43° |
| 2 | Raseborg | Uusimaa | 2.71 | 1,040 | 43° |
| 3 | Naantali | Southwest Finland | 2.69 | 1,027 | 43° |
| 4 | Väståboland | Southwest Finland | 2.68 | 1,022 | 43° |
| 5 | Pori | Satakunta | 2.67 | 1,033 | 44° |
| 6 | Raisio | Southwest Finland | 2.67 | 1,014 | 43° |
| 7 | Kotka | Kymenlaakso | 2.65 | 1,019 | 44° |
| 7 | Karhula | Kymenlaakso | 2.65 | 1,018 | 44° |
| 7 | Turku | Southwest Finland | 2.65 | 1,010 | 43° |
| 10 | Hamina | Kymenlaakso | 2.64 | 1,015 | 44° |
Least sunny places in Finland
Solar by region in Finland
Averages of the places in each region, sunniest first. Darkest month: what 1 kWp of off-grid panels at 70° makes a day in the worst month of the year.
| Region | Places | Sun hours/day | kWh per kWp a year | Best tilt | Darkest month at 70° | Sunniest place |
|---|---|---|---|---|---|---|
| Satakunta | 2 | 2.71 | 1,046 | 44° | 0.21 kWh | Rauma |
| Southwest Finland | 8 | 2.64 | 1,007 | 43° | 0.27 kWh | Naantali |
| Kymenlaakso | 4 | 2.63 | 1,012 | 44° | 0.33 kWh | Kotka |
| Uusimaa | 17 | 2.60 | 1,003 | 44° | 0.37 kWh | Raseborg |
| Ostrobothnia | 3 | 2.57 | 1,012 | 45° | 0.07 kWh | Vaasa |
| Kanta-Häme | 4 | 2.54 | 980 | 44° | 0.33 kWh | Forssa |
| Paijat-Hame | 5 | 2.53 | 977 | 45° | 0.33 kWh | Orimattila |
| South Karelia | 2 | 2.52 | 969 | 44° | 0.30 kWh | Lappeenranta |
| Central Ostrobothnia | 1 | 2.52 | 993 | 46° | 0.03 kWh | Kokkola |
| Pirkanmaa | 9 | 2.51 | 974 | 45° | 0.32 kWh | Vammala |
| South Ostrobothnia | 3 | 2.48 | 974 | 46° | 0.14 kWh | Kurikka |
| South Savo | 3 | 2.46 | 953 | 45° | 0.26 kWh | Mikkeli |
| Central Finland | 4 | 2.44 | 947 | 45° | 0.24 kWh | Jämsä |
| North Karelia | 2 | 2.42 | 938 | 45° | 0.22 kWh | Joensuu |
| North Savo | 4 | 2.41 | 944 | 46° | 0.18 kWh | Varkaus |
| North Ostrobothnia | 4 | 2.41 | 966 | 47° | 0.03 kWh | Raahe |
| Kainuu | 1 | 2.34 | 930 | 47° | 0.05 kWh | Kajaani |
| Lapland | 3 | 2.33 | 944 | 48° | 0.01 kWh | Tornio |
Largest places in Finland at a glance
| Place | Latitude | Best tilt | Off-grid tilt | Sun hours/day (flat) |
|---|---|---|---|---|
| Helsinki | 60.2° N | 44° | 80° | 2.62 |
| Espoo | 60.2° N | 44° | 80° | 2.61 |
| Tampere | 61.5° N | 45° | 84° | 2.50 |
| Vantaa | 60.3° N | 44° | 80° | 2.60 |
| Oulu | 65.0° N | 47° | 14° | 2.41 |
| Turku | 60.5° N | 43° | 77° | 2.65 |
| Jyväskylä | 62.2° N | 45° | 84° | 2.44 |
| Kuopio | 62.9° N | 46° | 84° | 2.42 |
| Lahti | 61.0° N | 45° | 83° | 2.53 |
| Pori | 61.5° N | 44° | 78° | 2.67 |
| Joensuu | 62.6° N | 45° | 84° | 2.42 |
| Kouvola | 60.9° N | 44° | 83° | 2.59 |
| Lappeenranta | 61.1° N | 44° | 83° | 2.53 |
| Vaasa | 63.1° N | 45° | 67° | 2.60 |
| Hämeenlinna | 61.0° N | 45° | 83° | 2.53 |
| Seinäjoki | 62.8° N | 46° | 82° | 2.48 |
| Rovaniemi | 66.5° N | 49° | 46° | 2.25 |
| Porvoo | 60.4° N | 44° | 80° | 2.60 |
| Mikkeli | 61.7° N | 45° | 83° | 2.48 |
| Salo | 60.4° N | 43° | 77° | 2.63 |
Daylight and clock time in Finland
In Rovaniemi (66.5° N), the northernmost place, the longest day of the year lasts 24 h (midnight sun) and the shortest 2 h 14 min; in Raseborg (60.0° N), the southernmost, 18 h 52 min and 5 h 53 min. The clocks change twice a year: forward on Sun 29 Mar, back on Sun 25 Oct (Europe/Helsinki).
| Time zone | Places | UTC offset | Clocks change in 2026 |
|---|---|---|---|
| Europe/Helsinki | 79 | UTC+2, in summer UTC+3 | Forward on Sun 29 Mar, back on Sun 25 Oct |