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Summasjärvi water level

Lake, Keski-Suomi, Finland

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Right now

High for mid-October

Surface elevation

109.25m Up 0.31 m over the last 7 days

108.5 109.0
Surface elevation: 109.25 m. High for mid-October.

History

History
108.5109.0mOct 10Oct 11Oct 12Oct 13Oct 15108.5109.0mOct 10Oct 12Oct 15
108.5109.0mSep 17Sep 24Oct 1Oct 8Oct 15108.5109.0mSep 17Oct 1Oct 15
108.5109.0109.5mOct 2025Jan 2026Apr 2026Jul 2026Oct 2026108.5109.0109.5mOct 2025Apr 2026Oct 2026
108.5109.0109.5mOct 2016Apr 2019Oct 2021Apr 2024Oct 2026108.5109.0109.5mOct 2016Oct 2021Oct 2026
108.5109.0109.5mJanMarMayJulSepNov2026108.5109.0109.5mJanAprJulOct2026

202120222023202420252026

Surface elevation Normal range (10–90 %)

What this means

Summasjärvi is above normal at 109.25 m.

That puts it 0.56 m above the median of 108.69 m for mid-October, based on 11 years of readings. A year ago it stood at 108.51 m (+0.74 m).

It has risen 0.31 m over the past week. In the last month it has stayed between 108.77 m and 109.25 m.

Many reservoirs reach their low point of the year in autumn, before winter rain and snow start the refill.

Compared with 11 years of daily readings for this time of year. How to read levels

Key numbers

Median for this date
108.69 m0.56 m above the median for this date
Normal for this date
108.37 m – 109.31 m8 years in 10 fall in this range (11 years of records)
Same day last year
108.51 m+0.74 m
Lowest and highest in 30 days
108.77 m – 109.25 m
Lowest and highest in 12 months
108.51 m – 109.25 m

On the water at Summasjärvi

Above-normal levels often mean flooded shoreline trees and debris on the surface. Slow down near the edges.

Weather at the gauge

The forecast is not available right now.

Sunrise 08:07 AM Sunset 06:03 PM Daylight 9h 56m First quarter 34 %

Map

Nearby gauges

Gauge Level Compared with normal 24 hours Distance
LeuhunkoskiRiver gauge 47.2 m³/s High 3.9 km
SaarijärviLake 118.22 m Normal 4.8 km
Pyhäjärvi, ParantalaLake, Kiimasjärvi 5.53 m³/s High 8.9 km
Pyhäjärvi, ParantalaLake, Pyhäjärvi 120.54 m High 8.9 km
LannevesiLake 112.04 m High 11 km
KiimasjärviLake 107.65 m Very low 12 km
Kiimasjärvi, HietamankoskiLake, Kiimasjärvi 57.0 m³/s High 14 km
KalmarinjärviLake, Kalmarinselkä 130.68 m High 21 km

Questions and answers

How does Summasjärvi compare with last year?

It is 0.74 m higher than on the same day last year, when the reading was 108.51 m.

How often is Summasjärvi updated?

Once a day. The source, Suomen ympäristökeskus (Syke), publishes a single daily value; the latest is from Oct 15, 2026.

What is the water level of Summasjärvi today?

On Oct 15, 2026, the surface elevation was 109.25 m. Up 0.31 m over the last 7 days.

Is Summasjärvi rising or falling?

Up 0.31 m over the last 7 days.

Is the level of Summasjärvi normal?

High for mid-October. Compared with 11 years of daily readings for this time of year.

How often is this data updated?

Suomen ympäristökeskus (Syke) publishes a new reading once a day. This page refreshes within minutes of each update.

Where does this data come from?

The values come directly from Suomen ympäristökeskus (Syke), the official operator of this gauge, and are published under the CC BY 4.0. We do not estimate or model live values.

For specialists

Station codes, datum, parameters, data quality and downloads
Operator
Suomen ympäristökeskus (Syke)
Station code
syke:1401900
Coordinates
62.67611, 25.34694 (WGS84)
Vertical datum
N2000
Update interval
once a day
Licence
CC BY 4.0. Data from the Finnish Environment Institute (Syke), CC BY 4.0; regions from Statistics Finland, CC BY 4.0

Published series

ParameterLast valueTime (UTC)Quality
Surface elevation elevation 109.25 m 2026-10-15 00:00 Provisional

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How to cite

Suomen ympäristökeskus (Syke): Summasjärvi (syke:1401900). Accessed October 16, 2026 via Nivelmap, https://nivelmap.com/en/finland/keski-suomi/summasjarvi

How we check values

Each reading is stored as published. We hold back values that jump faster than physically plausible and show the measurement time with every value.