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 Grisslehamn, entering September brings a subtle temperature decrement, reducing from August's comfortable 18.8°C (65.8°F) to a mild 15.1°C (59.2°F). The low temperature average during September reflects a slight decrease to a fresh 11.5°C (52.7°F) from the day's peak.Humidity
In September, the average relative humidity in Grisslehamn is 79%.Rainfall
In Grisslehamn, in September, it is raining for 13.1 days, with typically 27mm (1.06") of accumulated precipitation. Throughout the year, in Grisslehamn, there are 132.8 rainfall days, and 348mm (13.7") of precipitation is accumulated.Snowfall
June through September are months without snowfall in Grisslehamn.Daylight
The average length of the day in September is 12h and 52min.On the first day of the month, sunrise is at 05:40 and sunset at 19:48. On the last day of September, sunrise is at 06:49 and sunset at 18:19 CEST.
Sunshine
In Grisslehamn, the average sunshine in September is 8.2h.UV index
In Grisslehamn, the average daily maximum UV index in September is 3. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for average individuals.Note: The maximum daily UV index, 3 in September, converts into the following recommendations:
Heed the precautions - Suggestions to avoid sunburn are made. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly.
Frequently asked questions
What is the average September temperature in Grisslehamn?
What is the average humidity in September in Grisslehamn?
How many days does it rain in September in Grisslehamn?
When it does not snow in Grisslehamn?
Does it snow in Grisslehamn in September?
What is the average length of the day in September in Grisslehamn?
What time are sunrise and sunset in September in Grisslehamn?
How long on average sun shines in September in Grisslehamn?
What is the UV index reading in September in Grisslehamn?
Average temperature in September
Grisslehamn, Sweden
- Average high temperature in September: 15.1°C
The warmest month (with the highest average high temperature) is August (18.8°C).
The month with the lowest average high temperature is February (0.1°C).
- Average low temperature in September: 11.5°C
The month with the highest average low temperature is August (14.6°C).
The coldest month (with the lowest average low temperature) is February (-2.5°C).
Average pressure in September
Grisslehamn, Sweden
- Average pressure in September: 1013mbar
The month with the highest atmospheric pressure is May (1014.8mbar).
The month with the lowest atmospheric pressure is December (1007.1mbar).
Average wind speed in September
Grisslehamn, Sweden
- Average wind speed in September: 19.3km/h
The windiest month (with the highest average wind speed) is December (24.3km/h).
The calmest month (with the lowest average wind speed) is July (16.3km/h).
Average humidity in September
Grisslehamn, Sweden
- Average humidity in September: 79%
The month with the highest relative humidity is February (86%).
The month with the lowest relative humidity is May (76%).
Average rainfall in September
Grisslehamn, Sweden
- Average rainfall in September: 27mm
The wettest month (with the highest rainfall) is July (50mm).
The driest month (with the least rainfall) is April (15mm).
Average rainfall days in September
Grisslehamn, Sweden
- Average rainfall days in September: 13.1 days
The month with the highest number of rainy days is August (16.2 days).
The month with the least rainy days is February (4.8 days).
Average snowfall in September
Grisslehamn, Sweden
- Average snowfall in September: 0mm
The month with the highest snowfall is March (65mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in September
Grisslehamn, Sweden
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (10.9 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Grisslehamn, Sweden
- Average daylight in September: 12h and 5min
The month with the longest days is June (Average daylight: 18h and 48min).
The month with the shortest days is December (Average daylight: 6h and 0min).
- Average sunshine in September: 8h and 1min
The month with the most sunshine is June (Average sunshine: 12h and 48min).
The month with the least sunshine is December (Average sunshine: 2h and 30min).
Average sunshine days in September
Grisslehamn, Sweden
- Average sunshine days in September: 13.6 days
The months with the most sunshine days are April and May (16.3 days).
The month with the least sunshine days is December (11.5 days).
Average UV index in September
Grisslehamn, Sweden
- 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 and February (UV index 1).
Average cloud cover in September
Grisslehamn, Sweden
- Average cloud cover in September: 41
The month with the most cloud cover is January (Cloud cover 67).
The month with the least cloud cover is August (Cloud cover 35).
Average visibility in September
Grisslehamn, Sweden
- Average visibility in September: 10km
The months with the highest visibility are May, June, July, August, September and October (10km).
The months with the lowest visibility are January, February, March, April, November and December (9km).
Grisslehamn, Sweden
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