Drought Conditions Continue Across Switzerland Despite Recent Rain

Switzerland continues to face persistent drought conditions even after recent rainfall, with water levels in many rivers and lakes remaining critically low across the Swiss Plateau.

According to hydrologist Manuela Brunner from the Institute for Snow and Avalanche Research (SLF), the recent precipitation has had only a limited impact. She described the rainfall as “a drop in the ocean,” highlighting the ongoing severity of the situation.

Water Levels Remain Below Average

Measurements show that water levels in several rivers and lakes on the Swiss Plateau have reached unusually low values, in some cases approaching record lows for this time of year.

Conditions in Alpine regions are slightly better compared to the lowlands, but even there, river flows remain below long-term seasonal averages.

Dry Spring and Low Snowpack Behind the Crisis

Experts point to the extremely dry months of April and May as the main reason for the ongoing drought. In addition, Switzerland experienced an unusually thin snowpack in the Alps during the winter season.

Normally, this period marks the peak of Switzerland’s flood season, when melting snow and heavy rainfall significantly increase river and lake levels. This year, however, the expected seasonal water surge has been significantly weakened.

In the Dischma Valley near Davos in eastern Switzerland, snow cover is reported to be roughly half of the long-term average, further contributing to reduced water runoff into rivers.

Environmental Concerns Growing

The continued low water levels raise concerns about agriculture, ecosystems, and water supply in affected regions. Experts warn that prolonged dry conditions could have wider impacts if the situation does not improve in the coming weeks.

Hydrologists continue to monitor the situation closely as Switzerland moves deeper into the summer season, when water demand typically increases.

Authorities and researchers stress that climate variability and changing precipitation patterns are increasingly influencing Switzerland’s water systems, making long-term monitoring and adaptation essential.

Swiss Rivers and Lakes Remain Critically Low Despite Rain.

Switzerland continues to experience drought conditions as water levels in many rivers and lakes remain significantly below normal despite recent rainfall. According to measurements from the Federal Office for the Environment (FOEN), several major waterways across the country are still showing unusually low levels for this time of year.

The High Rhine, Reuss, and Limmat rivers remain below their seasonal averages, highlighting the ongoing impact of dry weather conditions that have persisted for months. While this week’s rain provided temporary relief, experts say it has not been enough to restore water levels to normal.

Lake Constance and Lake Zug are among the most affected areas. Hydrologists attribute the situation to prolonged drought combined with above-average temperatures, which have increased evaporation rates across Switzerland. The combination of reduced rainfall and warmer weather has placed additional pressure on lakes, rivers, and surrounding ecosystems.

Earlier this month, the western section of Lake Constance reached a historic low water level, creating challenges for navigation and transport. Since the end of April, a stretch of the Rhine River between Stein am Rhein and Diessenhofen has remained impassable due to insufficient water levels. However, shipping operations on Lake Zug and Lake Aegeri have continued without major disruptions despite the challenging conditions.

Environmental experts warn that extreme fluctuations between high and low water levels are becoming increasingly common. Unregulated bodies of water such as Lake Constance and Lake Walen are particularly vulnerable to changing weather patterns. According to Swiss Shipping Company Untersee und Rhein, these fluctuations have intensified in recent years, making water management and navigation more difficult.

The contrast has been striking. In June 2024, authorities issued the highest-level flood warning for the Untersee region. Less than a year later, the same area recorded historically low water levels. Experts say this demonstrates the growing unpredictability of weather patterns and the challenges they create for communities, businesses, and transport networks.

As Switzerland faces another dry season, authorities and industry leaders are exploring long-term solutions to maintain navigation, protect water resources, and adapt to increasingly extreme weather conditions. The situation continues to be closely monitored as concerns grow about the environmental and economic impacts of prolonged drought.

Lake Constance Water Levels Drop to Historic June Record Low.

Lake Constance, which borders Switzerland, Germany, and Austria, has recorded its lowest water level ever measured for the month of June. Experts attribute the dramatic decline to months of unusually low rainfall and below-average snowfall in the surrounding mountain regions.

The western section of the lake, known as the Untersee, has been particularly affected. Several boats have been left stranded along the shoreline as water levels continue to fall. According to water management officials in the Swiss canton of Thurgau, exceptionally dry weather conditions since early spring have significantly reduced the amount of water flowing into the lake.

April was especially dry across the region, while winter snowfall remained well below normal levels. As a result, the usual snowmelt that helps replenish the lake during spring was insufficient to restore water levels.

Lake Constance is particularly vulnerable to extended dry periods because, unlike most major Swiss lakes, its water levels are not artificially regulated. Together with Lake Walen, it remains one of the few large lakes in Switzerland that fluctuates entirely according to natural conditions. This makes both droughts and flooding events more noticeable.

Current measurements indicate that Lake Constance is approximately one metre below the long-term average for June. The situation is also affecting transportation and tourism. Shipping operator Untersee und Rhein (URh) has reported navigation difficulties, with parts of the Rhine River between Stein am Rhein and Diessenhofen currently inaccessible to passenger vessels due to low water levels.

Environmental experts warn that prolonged drought conditions and rising temperatures could lead to more frequent water shortages in the future. The development has renewed concerns about climate change and its growing impact on Switzerland’s lakes, rivers, and natural ecosystems.

Swiss Spring 2026 Among Warmest on Record.

Swiss Spring 2026 became the third warmest spring ever recorded in Switzerland, according to the Federal Office of Meteorology and Climatology (MeteoSwiss). The season brought unusually high temperatures, abundant sunshine, and exceptionally dry weather across much of the country. National temperatures from March to May averaged 1.6°C above the 1991–2020 climate reference period, making it one of the warmest springs in Swiss history.

April stood out as one of the hottest months ever recorded, while May delivered dramatic weather changes. A brief cold spell with frost and snowfall at lower elevations quickly gave way to an unusually early heatwave. By the end of May, several regions recorded new daily temperature highs, highlighting the intensity of the warming trend across Switzerland.

The southern Swiss town of Biasca in Canton Ticino reached 34.8°C on May 28, setting a new May temperature record for the southern side of the Alps. The figure came remarkably close to Switzerland’s all-time May record of 35.1°C, recorded in Sion in 2009. Meteorologists noted that such extreme temperatures are becoming increasingly common during spring months.

Switzerland also experienced one of its driest springs on record. Many regions received between 40% and 90% less rainfall than normal. Eastern Switzerland, including Graubünden and the Engadin region, faced particularly severe dryness, recording the driest spring since weather observations began in 1901.

Experts continue to monitor these climate patterns as rising temperatures and prolonged dry conditions increasingly affect agriculture, water resources, and ecosystems across Switzerland. The latest data highlights the growing impact of climate change on the country’s seasonal weather patterns.

Switzerland Records Fourth Hottest May Since 1864 Amid Severe Dry Conditions

Switzerland is set to record its fourth hottest May since weather records began in 1864, according to the national meteorological service MeteoSwiss. The country is also experiencing unusually dry conditions across many regions.

Temperature Above Average

Meteorological data shows that temperatures in May 2026 have been approximately 1.8°C above the long-term average. The nationwide average daily temperature has reached 10.7°C so far this month.

Early rainfall at the beginning of May was not sufficient to compensate for a significant precipitation deficit that has developed since March.

Severe Rainfall Deficit

Rainfall levels across Switzerland have dropped sharply, with only around 56% of the average precipitation recorded nationally. In some regions, rainfall has fallen to just 40% of normal levels.

Canton Graubünden and the Engadine region have been particularly affected, receiving less than half of their typical rainfall.

Comparison With Historic Droughts

Experts note that current conditions resemble historic drought years such as 1944 and 1976. The ongoing spring season is also expected to rank among the driest since modern records began in 1901.

Government Weather Alert

The Swiss government has issued a Level 2 drought alert, currently affecting the Alps and eastern Plateau regions. Authorities classify this as a mild drought, with no immediate improvement expected in the short term.

Early Heatwave Conditions

Switzerland has already experienced early heatwave conditions, with temperatures exceeding 30°C in several regions. In Ticino and parts north of the Alps, temperatures have climbed above 34°C.

In Valais, the temperature reached 34.2°C in Sion, marking one of the earliest intense heat events of the season.

Impact on High Altitudes

Even high mountain regions have been affected. The 0°C isotherm rose to 4,328 metres above sea level during Whitsun weekend, making it one of the highest recorded levels for May.

Climate Change Influence

Meteorologists highlight that climate change is influencing seasonal patterns in Switzerland. Heatwaves are occurring earlier, lasting longer, and affecting higher altitudes with increasing intensity.

The Federal Office of Meteorology and Climatology warns that such extreme conditions are becoming more frequent across the Alpine region.