Weather in Harstad in September 2025
Average weather
Average temperature in Harstad in September
The temperature in September is +12°C on average, with a range between a maximum of +17°C during the day and a minimum of +6°C at night.
The average maximum temperature goes down 9% by the end of the month, compared with the beginning of the month, from +13°C to +12°C.
Is Harstad warm or cold in September?
Harstad is typically cool in September.
Maximum temperatures go down compared to the previous month from +14°C to +11°C. The minimum temperature also goes down from +11°C to +8°C.
Pack a sweater and a jacket as there will be cooler temperatures.
Take a look at how September is compared to other months in Harstad:
Climate in Harstad in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +14°C | +11°C | +6°C | ||||
| Min. temperature | ||||||
| +3°C | -3°C | -14°C | ||||
| Max. temperature | ||||||
| +28°C | +20°C | +16°C | ||||
| Rainfall | ||||||
| 103 mm | 118 mm | 113 mm | ||||
| Wind | ||||||
| 2 m/s | 2 m/s | 2 m/s | ||||
| Humidity | ||||||
| 81% | 82% | 82% | ||||
| Air pressure | ||||||
| 1010 HPa | 1008 HPa | 1006 HPa | ||||
| Sunny days | ||||||
| 1 | 2 | 2 | ||||
| Cloudy days | ||||||
| 8 | 7 | 8 | ||||
| Rainy days | ||||||
| 21 | 21 | 17 | ||||
| Snowy days | ||||||
| 0 | 0 | 4 | ||||
September weather is still as ok as in August. It’s getting colder in September. From +14°C in the day, the average maximum temperature lowers to +11°C. Prepare for more rain. Average rainfall goes from 103 mm to 118 mm. Humidity rises from 81% to 82%. The average wind speed doesn’t change much during September, staying around 2 m/s. The good news is there are likely to be more sunny days in September, from 1 to 2.
October brings much the same weather, it remains ok.
Wind
The average wind speed is 6 m/s getting up to 14 m/s which is quite strong. The wind will cause branches to move and ground debris to fly around.
The average wind speed in Harstad is gradually increasing during September, going from 2 m/s to 6 m/s over the course of the month.
Rain
How was the weather last September in Harstad?
Climate Change over Years
The climate in Harstad in September has not changed much over the last 43 years.
The average temperature was the lowest in 1981 (+4°C) and the highest in 2011 (+7°C). The driest year was 1980 with only 570 mm of rainfall, and the wettest year was 2005 with 1322 mm.
FAQ
Is September a good time to visit Harstad?
Can you sunbathe in Harstad in September?
Is Harstad rainy in September?
Is it sunny in Harstad in September?
Other cities in Norway
Monthly weather in Harstad
Source of the data
For this page, we’ve looked at the typical weather in Harstad, 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.