Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
In September, the meteorological conditions alter, with the average high-temperature shifting from a pleasant 20.7°C (69.3°F) in August to a refreshing 14.9°C (58.8°F). During September, the average low-temperature in Hämeenlinna is a frosty 7.5°C (45.5°F).Humidity
In September, the average relative humidity in Hämeenlinna is 83%.Rainfall
In September, the rain falls for 14.2 days. Throughout September, 35mm (1.38") of precipitation is accumulated. In Hämeenlinna, Finland, during the entire year, the rain falls for 129.3 days and collects up to 403mm (15.87") of precipitation.Snowfall
June through September are months without snowfall.Daylight
In September, the average length of the day in Hämeenlinna is 12h and 54min.On the first day of September in Hämeenlinna, Finland, sunrise is at 06:15 and sunset at 20:28. On the last day of the month, sunrise is at 07:27 and sunset at 18:56 EEST.
Sunshine
In Hämeenlinna, the average sunshine in September is 6.3h.UV index
The average daily maximum UV index in September is 3. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The daily high UV index of 3 during September translates into the following recommendations:
Prioritize safety - Recommendations to avert sunburn are shared. The intensity of the Sun's UV radiation during midday suggests reducing time spent outdoors. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key. Attention! Nearly twice the Sun's UV radiation can be reflected by snow.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Hämeenlinna in September?
What is the average humidity in September in Hämeenlinna?
How many days does it rain in September in Hämeenlinna?
When it does not snow in Hämeenlinna?
Does it snow in Hämeenlinna in September?
What is the average length of the day in September in Hämeenlinna?
When are sunrise and sunset in September in Hämeenlinna?
How long on average sun shines in September in Hämeenlinna?
What is the UV index reading in September in Hämeenlinna?
Average temperature in September
Hämeenlinna, Finland
- Average high temperature in September: 14.9°C
The warmest month (with the highest average high temperature) is July (21.8°C).
The month with the lowest average high temperature is January (-4.4°C).
- Average low temperature in September: 7.5°C
The month with the highest average low temperature is July (12.1°C).
The coldest month (with the lowest average low temperature) is January (-8.5°C).
Average pressure in September
Hämeenlinna, Finland
- Average pressure in September: 1013.1mbar
The month with the highest atmospheric pressure is May (1014.8mbar).
The month with the lowest atmospheric pressure is December (1008mbar).
Average wind speed in September
Hämeenlinna, Finland
- Average wind speed in September: 10.5km/h
The windiest month (with the highest average wind speed) is December (12km/h).
The calmest month (with the lowest average wind speed) is August (9.6km/h).
Average humidity in September
Hämeenlinna, Finland
- Average humidity in September: 83%
The month with the highest relative humidity is February (95%).
The month with the lowest relative humidity is May (66%).
Average rainfall in September
Hämeenlinna, Finland
- Average rainfall in September: 35mm
The wettest month (with the highest rainfall) is July (54mm).
The driest months (with the least rainfall) are March and April (25mm).
Average rainfall days in September
Hämeenlinna, Finland
- Average rainfall days in September: 14.2 days
The month with the highest number of rainy days is July (18.1 days).
The month with the least rainy days is February (3.3 days).
Average snowfall in September
Hämeenlinna, Finland
- Average snowfall in September: 0mm
The month with the highest snowfall is January (157mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in September
Hämeenlinna, Finland
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is January (18.6 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Hämeenlinna, Finland
- Average daylight in September: 12h and 5min
The month with the longest days is June (Average daylight: 19h and 6min).
The month with the shortest days is December (Average daylight: 5h and 42min).
- Average sunshine in September: 6h and 2min
The month with the most sunshine is June (Average sunshine: 11h and 12min).
The month with the least sunshine is December (Average sunshine: 1h and 24min).
Average sunshine days in September
Hämeenlinna, Finland
- Average sunshine days in September: 11.8 days
The month with the most sunshine days is May (15.9 days).
The month with the least sunshine days is March (9.4 days).
Average UV index in September
Hämeenlinna, Finland
- Average UV index in September: 3
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, March, November and December (UV index 1).
Average cloud cover in September
Hämeenlinna, Finland
- Average cloud cover in September: 59
The months with the most cloud cover are January and February (Cloud cover 80).
The months with the least cloud cover are May, June, July and August (Cloud cover 47).
Average visibility in September
Hämeenlinna, Finland
- Average visibility in September: 8km
The months with the highest visibility are May, June and July (9km).
The months with the lowest visibility are January and February (5km).
Hämeenlinna, Finland
Weather forecast for your location
2. Allow the app to use your location