Lake ÕisuWhen to Go
Best Time to Visit Lake Õisu
Summer is the most visitor‑friendly; spring brings migration activity; autumn is quieter.
Late spring
May-June · 8-18°C
Bird migration and blooming marshes; paths can be muddy.
Summer
July-August · 15-25°C
Warmest, best for boating and swimming.
Autumn
September-October · 5-12°C
Quiet and cool with good colors.
Weather & Climate near Lake Õisu
Climate
Lake Õisu's climate is classified as Warm-Summer Continental - Warm-Summer Continental climate with mild summers (peaking in July) and freezing winters (coldest in February). Temperatures range from -10°C to 23°C. Moderate rainfall (654 mm/year).
Air Quality:
AQI 27
Good
Best Time to Visit
JulyMayJune
Temperature & Rainfall
Temperature Range
32°
Warmest Month
-41°
Coldest Month
Monthly Conditions
| Month | Comfort | Temp | Feels | Rain | Sky | Humidity | Wind | UV | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | Poor | -8° - -3° | -11° | 43 mm | overcast | 97% | 3.3 m/s | 0.0 low | 6.9h |
| February | Poor | -10° - -3° | -11° | 31 mm | overcast | 96% | 3.1 m/s | 0.1 low | 9.1h |
| March | Poor | -5° - 2° | -6° | 33 mm | partly cloudy | 93% | 3.1 m/s | 0.3 low | 11.6h |
| April | Good | 0° - 9° | 2° | 33 mm | partly cloudy | 84% | 3.0 m/s | 0.6 moderate | 14.2h |
| May | Very Good | 5° - 17° | 11° | 41 mm | partly cloudy | 79% | 3.0 m/s | 1.1 high | 16.6h |
| June | Good | 10° - 20° | 15° | 60 mm | partly cloudy | 78% | 2.7 m/s | 1.3 high | 17.9h |
| July | Very Good | 12° - 23° | 17° | 71 mm | partly cloudy | 77% | 2.4 m/s | 1.2 high | 17.2h |
| August | Good | 11° - 21° | 16° | 77 mm | partly cloudy | 78% | 2.4 m/s | 0.9 moderate | 15.1h |
| September | Good | 7° - 15° | 11° | 74 mm | overcast | 83% | 2.7 m/s | 0.5 low | 12.6h |
| October | Acceptable | 2° - 9° | 3° | 67 mm | overcast | 90% | 3.0 m/s | 0.1 low | 10.0h |
| November | Poor | -2° - 3° | -3° | 70 mm | overcast | 96% | 3.3 m/s | 0.0 low | 7.6h |
| December | Poor | -6° - -1° | -9° | 54 mm | overcast | 97% | 3.3 m/s | 0.0 low | 6.2h |
Getting There & Around
How to Get to Lake Õisu
From Viljandi, drive via regional roads toward Õisu (roughly 25-30 minutes). The lake is best accessed by car; local lanes lead to small parking areas and lakeside paths.
Tips for Visiting Lake Õisu
- Walk the marked paths on the western shore to see the lake's best viewpoints and the old stone causeway remains.
- Visit during frog and bird migration season (spring) for lively natural spectacles.
- Combine a trip with a stop at Viljandi town (approx. 25 km) for cafés and cultural sites.