Weather in Kalmar in September 2025
Average weather
Average temperature in Kalmar in September
The expected average maximum temperature in September is +66°F with a maximum of +75°F and a minimum of +48°F.
The average maximum temperature goes up 7% by the end of the month, compared with the beginning of the month, from +61°F to +63°F.
Is Kalmar warm or cold in September?
Kalmar is typically mild in September.
Maximum temperatures go down compared to the previous month from +68°F to +61°F. The minimum temperature also goes down from +55°F to +50°F.
Pack a light jacket as it will be warm in the day and cool in the evenings.
Take a look at how September is compared to other months in Kalmar:
Water temperature in Kalmar in September
Water in Kalmar in September is Cold. It varies from +53°F to +68°F, with an average of +60°F. This is almost similar to the air temperature, which averages +61°F.
The water temperature in September is one of the warmest of the entire year:
Can you swim in Kalmar in September?
Climate in Kalmar in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +68°F | +61°F | +52°F | ||||
| Min. temperature | ||||||
| +34°F | +30°F | +18°F | ||||
| Max. temperature | ||||||
| +90°F | +77°F | +68°F | ||||
| Rainfall | ||||||
| 55 mm | 47 mm | 50 mm | ||||
| Wind | ||||||
| 3 m/s | 3 m/s | 4 m/s | ||||
| Avg. water temperature | ||||||
| +65°F | +60°F | +52°F | ||||
| Humidity | ||||||
| 77% | 80% | 83% | ||||
| Air pressure | ||||||
| 1012 HPa | 1013 HPa | 1012 HPa | ||||
| Sunny days | ||||||
| 7 | 6 | 5 | ||||
| Cloudy days | ||||||
| 8 | 10 | 11 | ||||
| Rainy days | ||||||
| 16 | 14 | 15 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
September weather is still as ok as in August. It’s getting colder in September. From +68°F in the day, the average maximum temperature lowers to +61°F. As September arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 55 mm to 47 mm. Humidity rises from 77% to 80%. The average wind speed doesn’t change much during September, staying around 3 m/s. The days becoming less sunny, going from 7 sunny days in August to 6 in September.
October brings much the same weather, it remains ok.
Wind
The average wind speed is 3 m/s getting up to 6 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in Kalmar is gradually increasing during September, going from 2 m/s to 5 m/s over the course of the month.
Rain
How was the weather last September in Kalmar?
Climate Change Over the Years
The climate in Kalmar in September has not changed that much over the last 43 years.
The average temperature was the lowest in 1987 (+46°F) and the highest in 2020 (+56°F). The driest year was 2018 with only 315 mm of rainfall, and the wettest year was 2023 with 641 mm.
FAQ
Is September a good time to visit Kalmar?
Can you sunbathe in Kalmar in September?
Can you swim in Kalmar in September?
Is Kalmar rainy in September?
Is it sunny in Kalmar in September?
Other cities in Sweden
Monthly weather in Kalmar
Source of the data
For this page, we’ve looked at the typical weather in Kalmar, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.