Västerås climate
Västerås (Sweden) has a warm-summer humid continental climate (Köppen Dfb). The average temperature over the year is 7 °C44 °F, and about 741 mm29 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
Västerås climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin | Frost days |
|---|---|---|---|---|---|
| Jan | −229 | −720 | −424 | 481.9 | 27 |
| Feb | −131 | −621 | −326 | 411.6 | 25 |
| Mar | 439 | −326 | 032 | 391.5 | 24 |
| Apr | 1051 | 235 | 643 | 401.6 | 10 |
| May | 1661 | 744 | 1153 | 672.6 | 1 |
| Jun | 2068 | 1153 | 1661 | 863.4 | 0 |
| Jul | 2373 | 1458 | 1965 | 943.7 | 0 |
| Aug | 2271 | 1355 | 1763 | 833.3 | 0 |
| Sep | 1762 | 948 | 1355 | 542.1 | 0 |
| Oct | 949 | 439 | 644 | 722.8 | 5 |
| Nov | 438 | 032 | 235 | 622.5 | 15 |
| Dec | 031 | −524 | −228 | 542.1 | 24 |
| Year | 2373 | −720 | 744 | 74129 | 131 |
“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 | 97% | 85% | 0.3 | 6:46 |
| Feb | 96% | 84% | 0.9 | 9:05 |
| Mar | 89% | 76% | 2.3 | 11:35 |
| Apr | 81% | 70% | 3.9 | 14:25 |
| May | 77% | 69% | 5.1 | 17:01 |
| Jun | 74% | 69% | 5.8 | 18:40 |
| Jul | 74% | 68% | 5.3 | 17:57 |
| Aug | 78% | 70% | 4.2 | 15:33 |
| Sep | 82% | 73% | 2.7 | 12:44 |
| Oct | 91% | 77% | 1.2 | 9:00 |
| Nov | 96% | 80% | 0.4 | 7:27 |
| Dec | 98% | 83% | 0.2 | 6:02 |
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 Västerås is like
The warmest month is July, with an average high of 23 °C73 °F and a low of 14 °C58 °F. The coldest is January, when highs average −2 °C29 °F and lows −7 °C20 °F. Seasons are strongly marked: the warmest month is on average 22.9 °C41.3 °F warmer than the coldest.
Annual precipitation is moderate at about 741 mm29 in. The wettest three-month stretch is June–August, which brings 36% of the annual total. The wettest month is July (94 mm3.7 in), the driest is March (39 mm1.5 in).
Relative humidity ranges from 74% in June to 98% in December. The clearest skies (lowest average cloud amount, 68%) are typical of July. Average wind speed near the ground ranges from 1 km/h (1 mph) in January to 3 km/h (2 mph) in September. Daylight lasts from about 6.0 hours in December to 18.7 hours in June.
A lasting snow cover is typical in November–March, when the average snow depth in the reanalysis exceeds 10 cm (deepest in February, about 17 cm).
Best time to visit Västerås
Based on these averages, the most comfortable months for sightseeing and outdoor activities are June–August: average highs of 20 °C68 °F to 23 °C73 °F with 83 mm3.3 in to 94 mm3.7 in of precipitation per month.
The most challenging month is January, which is cold, with average highs of −2 °C29 °F.
Comfort score: months are ranked by how close they come to 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 Västerås
- Winter (December–February) — highs −229 to 0 °C31 °F, lows −720 to −5 °C24 °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 439 to 16 °C61 °F, lows −326 to 7 °C44 °F, about 49 mm1.9 in of precipitation a month. Pack a warm coat, layers and closed shoes.
- Summer (June–August) — highs 2068 to 23 °C73 °F, lows 1153 to 14 °C58 °F, about 88 mm3.5 in of precipitation a month. Pack light layers — T-shirts plus a light sweater or jacket.
- Autumn (September–November) — highs 438 to 17 °C62 °F, lows 032 to 9 °C48 °F, about 63 mm2.5 in of precipitation a month. Pack a warm coat, layers and closed shoes.
How Västerås compares
Compared with Uppsala, about 67 km to the northeast, Västerås is on average 0.3 °C0.6 °F warmer and receives 5% more precipitation (741 mm29 in vs 704 mm28 in). The difference is largest in May (0.7 °C1.3 °F warmer).
Of the 11 places in Sweden covered by World Climates, Västerås is the 8th warmest by annual mean temperature and the 7th wettest by annual precipitation. See all of them on the Sweden climate page.
Places in other countries with the most similar temperature and rainfall pattern: Olsztyn (Poland, Dfb), Kaunas (Lithuania, Dfb) and Riga (Latvia, Dfb).
Nearby places
- Uppsala 67 km · 6 °C44 °F · 704 mm28 in
- Sollentuna 82 km · 7 °C44 °F · 665 mm26 in
- Örebro 85 km · 7 °C44 °F · 850 mm33 in
- Stockholm 91 km · 7 °C44 °F · 665 mm26 in
- Linköping 144 km · 7 °C45 °F · 757 mm30 in
- Mariehamn 196 km · 7 °C45 °F · 649 mm26 in
- Jönköping 247 km · 7 °C45 °F · 819 mm32 in
- Oslo 327 km · 6 °C43 °F · 1,047 mm41 in
Frequently asked questions
What is the warmest month in Västerås?
July is the warmest month in Västerås, with an average high of 23 °C (73 °F) and an average low of 14 °C (58 °F).
What is the coldest month in Västerås?
January is the coldest month, with an average high of -2 °C (29 °F) and an average low of -7 °C (20 °F).
When does it rain the most in Västerås?
July is the wettest month with about 94 mm (3.7 in) of precipitation; March is the driest with about 39 mm (1.5 in).
What is the best time to visit Västerås?
Judging by long-term averages, the most comfortable months are June–August.
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 — most of all 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.