Olsztyn climate
Olsztyn (Poland) has a warm-summer humid continental climate (Köppen Dfb). The average temperature over the year is 7 °C45 °F, and about 702 mm28 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
Olsztyn climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin | Frost days |
|---|---|---|---|---|---|
| Jan | −228 | −719 | −524 | 502.0 | 26 |
| Feb | 032 | −621 | −326 | 401.6 | 25 |
| Mar | 541 | −326 | 134 | 431.7 | 22 |
| Apr | 1254 | 235 | 744 | 391.5 | 9 |
| May | 1864 | 745 | 1254 | 642.5 | 1 |
| Jun | 2169 | 1151 | 1660 | 753.0 | 0 |
| Jul | 2374 | 1456 | 1865 | 883.5 | 0 |
| Aug | 2373 | 1355 | 1864 | 742.9 | 0 |
| Sep | 1865 | 847 | 1356 | 552.2 | 0 |
| Oct | 1152 | 338 | 745 | 622.5 | 4 |
| Nov | 541 | 033 | 337 | 572.2 | 12 |
| Dec | 033 | −425 | −229 | 532.1 | 24 |
| Year | 2374 | −719 | 745 | 70228 | 123 |
“Year” row: highest monthly high, lowest monthly low, annual mean and annual total. Frost days are for the whole grid cell.
| Month | Humid. | Cloud | Solar | Daylight |
|---|---|---|---|---|
| Jan | 95% | 83% | 0.6 | 7:57 |
| Feb | 93% | 82% | 1.3 | 9:42 |
| Mar | 86% | 72% | 2.6 | 11:40 |
| Apr | 79% | 61% | 4.2 | 13:56 |
| May | 77% | 64% | 5.3 | 15:55 |
| Jun | 76% | 62% | 5.6 | 17:04 |
| Jul | 77% | 66% | 5.2 | 16:35 |
| Aug | 75% | 60% | 4.5 | 14:49 |
| Sep | 78% | 63% | 3.1 | 12:36 |
| Oct | 86% | 71% | 1.7 | 10:25 |
| Nov | 93% | 83% | 0.7 | 8:27 |
| Dec | 95% | 83% | 0.4 | 7:26 |
Humid. = average relative humidity at 2 m; cloud = average cloud amount; solar = average daily solar energy reaching the ground in kWh/m² (all-sky); daylight in hours:minutes, calculated for the 15th of each month.
What the climate of Olsztyn is like
The warmest month is July, with an average high of 23 °C74 °F and a low of 14 °C56 °F. The coldest is January, when highs average −2 °C28 °F and lows −7 °C19 °F. Seasons are strongly marked: the warmest month is on average 23 °C41.3 °F warmer than the coldest.
Annual precipitation is moderate at about 702 mm28 in. The wettest three-month stretch is June–August, which brings 34% of the annual total. The wettest month is July (88 mm3.5 in), the driest is April (39 mm1.5 in).
Relative humidity ranges from 75% in August to 95% in January. The clearest skies (lowest average cloud amount, 60%) are typical of August. Average wind speed near the ground ranges from 9 km/h (5 mph) in August to 14 km/h (9 mph) in January. Daylight lasts from about 7.4 hours in December to 17.1 hours in June.
A lasting snow cover is typical in December–March. In those months the average snow depth in the reanalysis exceeds 10 cm. It is deepest in January, at about 17 cm.
Best time to visit Olsztyn
Based on these averages, the most comfortable months for sightseeing and outdoor activities are June–September. Average highs then reach 18 °C65 °F to 23 °C74 °F. Precipitation is 55 mm2.2 in to 88 mm3.5 in per month.
The most challenging month is January, which is cold, with average highs of −2 °C28 °F.
Comfort score: months are ranked by how close they come to an ideal. That means an average high of 21–28 °C (70–82 °F), lows above 5 °C (41 °F), little precipitation and moderate humidity. The best-ranked months of each place are recommended, even where none meets all of these. These are general rules of thumb applied to long-term averages.
What to pack for Olsztyn
- Winter (December–February) — highs −228 to 0 °C33 °F, lows −719 to −4 °C25 °F, about 48 mm1.9 in of precipitation a month. Pack a winter coat, hat, gloves and warm, non-slip boots and shoes with good grip, as frost is common.
- Spring (March–May) — highs 541 to 18 °C64 °F, lows −326 to 7 °C45 °F, about 49 mm1.9 in of precipitation a month. Pack long sleeves, a sweater and a medium jacket.
- Summer (June–August) — highs 2169 to 23 °C74 °F, lows 1151 to 14 °C56 °F, about 79 mm3.1 in of precipitation a month. Pack light layers — T-shirts plus a light sweater or jacket.
- Autumn (September–November) — highs 541 to 18 °C65 °F, lows 033 to 8 °C47 °F, about 58 mm2.3 in of precipitation a month. Pack long sleeves, a sweater and a medium jacket.
How Olsztyn compares
The nearest larger place is Kaliningrad, about 103 km to the north. Compared with it, Olsztyn is on average 0.7 °C1.2 °F cooler. It receives 6% less precipitation (702 mm28 in vs 744 mm29 in). The difference is largest in January (1.2 °C2.1 °F cooler).
World Climates covers 36 places in Poland. By annual mean temperature, Olsztyn is the 36th warmest of them. By annual precipitation, it is the 11th wettest. See all of them on the Poland climate page.
Some places in other countries have a very similar pattern of temperature and rainfall. The closest matches are Linköping (Sweden, Dfb), Västerås (Sweden, Dfb) and Hrodna (Belarus, Dfb).
Nearby places
- Climate in Elbląg 82 km · 8 °C47 °F · 691 mm27 in
- Climate in Kaliningrad 103 km · 8 °C46 °F · 744 mm29 in
- Climate in Gdańsk 136 km · 9 °C48 °F · 713 mm28 in
- Climate in Płock 147 km · 9 °C47 °F · 612 mm24 in
- Climate in Toruń 152 km · 9 °C48 °F · 623 mm25 in
- Climate in Włocławek 158 km · 9 °C48 °F · 610 mm24 in
- Climate in Białołeka 166 km · 9 °C48 °F · 623 mm25 in
- Climate in Bielany 168 km · 9 °C47 °F · 613 mm24 in
Frequently asked questions
What is the warmest month in Olsztyn?
July is the warmest month in Olsztyn. Its average high is 23 °C (74 °F) and its average low is 14 °C (56 °F).
What is the coldest month in Olsztyn?
January is the coldest month. Its average high is -2 °C (28 °F) and its average low is -7 °C (19 °F).
When does it rain the most in Olsztyn?
July is the wettest month with about 88 mm (3.5 in) of precipitation. April is the driest with about 39 mm (1.5 in).
What is the best time to visit Olsztyn?
Judging by long-term averages, the most comfortable months are June–September.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station. So they can differ from airport records. The gaps are largest on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.