Early September 1 September
63°F
Typical afternoon high
39% historical wet-day frequency
Norway · Countryside
Trondheim & Trøndelag
in September.
Is September a good time?
Cool days.
Fewer overnight stays than August.
September averages 59°F afternoons and 56°F seas, with about 14 rain days. Later September is typically cooler.
- Afternoons
- 59°F
- Sea
- 56°F
- Visitor demand
- 59%of July peak
Historical Trøndelag/Trööndelage regional averages, not a forecast or a measure of queues. Overnight demand compares average stays per day. Covers Trondheim; conditions vary within the region.
Overall match
5.8/10 · scores & prioritiesWhat matters most?
Weather 50% · Crowds 30% · Cost 20%
#3 of 12 months here · Balanced mix
Weather5.9/10Good
CrowdsModerate seasonvs its own year; overnight stays do not measure queuesFor its size, typical for Europe this month
CostExpensivefor Europe
Overall combines weather, overnight demand and cost. It does not include sea temperature.
Plan your September
What to expect.
What should I pack?
Afternoons around 59°F (15°C): light layers; nights around 46°F (8°C): a warm coat. Bring rain gear: about 14 days with at least 1 mm of rain. About 13 hours of daylight.
Can I swim in September?
The sea averages 56°F. Our swimming guide: very cold: wetsuit weather. Your comfort will vary. This is open water near the coast, not a beach-specific reading.
Monthly coastal averages from NOAA, 2011–2025. Sea temperature is separate from the weather and Overall scores.
A typical day: temperatures & daylightAfternoons, nights, sea temperature & daylight Show detailsHide details
About 13 hours of daylight.
The sun rises about 06:35 and sets about 19:45 (local time, mid-month). Mornings start around 46°F (8°C); afternoons reach about 59°F (15°C). Expect rain on about 14 days in a typical September.
Typical afternoon
59°F (15°C)
average daily high, 15 recent Septembers
Night low
46°F (8°C)
average daily minimum
Sea
56°F (13°C)
very cold; open water near the coast, NOAA satellite record 2011–2025
Daylight
13h 10m
on the 15th, computed from latitude
Early, middle or late?
Early or late September?
Early September is typically warmer. The afternoon high averages 63°F on the 1st, versus 54°F on the 30th. Historical wet-day frequency rises from 39% to 47% between those dates.
Mid September 15 September
60°F
Typical afternoon high
45% historical wet-day frequency
Late September 30 September
54°F
Typical afternoon high
47% historical wet-day frequency
Historical daily averages from 2011–2025, smoothed over two weeks. A seasonal pattern, not a forecast. This does not establish which week has the lowest prices or fewest visitors.
Daily calendar & holiday datesSeptember 2027 · historical weather & dated holidays Show calendarHide calendar
September 2027 calendar
Weather shows historical patterns, not a forecast. Holidays and events use the dates shown for 2027.
| Mon | Tue | Wed | Thu | Fri | Sat | Sun |
|---|---|---|---|---|---|---|
| 163° | 263° | 363° | 463° | 563° | ||
| 662° | 762° | 862° | 962° | 1062° | 1161° | 1261° |
| 1361° | 1460° | 1560° | 1659° | 1758° | 1858° | 1958° |
| 2057° | 2157° | 2257° | 2356° | 2456° | 2556° | 2656° |
| 2755° | 2855° | 2955° | 3054° |
Afternoon high rain likely (25%+) local school holidays public holiday event
School-holiday dates for September 2027 aren't available in our data yet. A day without a school marker doesn't mean schools are open.
Afternoons cool from about 63°F (17°C) in the first week to 55°F (13°C) in the last. The chance of a wet day runs 38–48%.
Crowds and cost
Visitor season
Will it be busy?
Moderate season. September averages 59% of July's overnight stays per day. Fewer overnight stays than August.
Overnight stays across Trøndelag/Trööndelage do not measure queues, day visitors or congestion at individual sights. For its size, typical for Europe this month.
Hotel price season
Will it be cheaper?
A little above usual. Historical regional hotel revenue (2024–2025 monthly average): €120 per occupied room-night. An average, not a booking quote.
Fewer overnight stays do not automatically mean cheaper rooms. Check actual quotes for your trip.
Historical hotel average
€120
2024–2025 monthly average; hotel revenue per occupied room-night; not a current booking quote. +5% vs this region's usual month.
Norway as a whole
Well above EU average
2024 restaurants and hotels price level: 140 where the EU average is 100. A relative index, not a room rate.
The historical regional amount comes from Statistics Norway (SSB), table 14168: hotel accommodation revenue per occupied room; the country price level is national. Hotel averages are not live booking quotes.
Year-to-year variation
How much does September vary?
Across the recorded years
In the 15 years from 2011 to 2025, the month's afternoons averaged between 54°F (12°C) and 63°F (17°C); in 12 of them they were within 3°F (1.5°C) of the typical 59°F (15°C). Rain days ranged from 7 to 19; half the years had 10–17.
Rain days in each September
Rain days
14
at least 1 mm, typical year; about 17 in a wet year
Mostly sunny days
2 of 30
cloud cover under 30%
Years with a 95°F+ day
0 of 15
no September in the last 15 years had a day at or above 95°F (35°C)
Good weather days
12 of 30
rated very good or better
See every recorded SeptemberHistorical monthly averages, year by year Show detailsHide details
| Year | Afternoon high | Rain days |
|---|---|---|
| 2011 | 59°F | 16 |
| 2012 | 54°F | 17 |
| 2013 | 60°F | 7 |
| 2014 | 61°F | 10 |
| 2015 | 59°F | 11 |
| 2016 | 63°F | 14 |
| 2017 | 60°F | 7 |
| 2018 | 58°F | 19 |
| 2019 | 57°F | 18 |
| 2020 | 58°F | 17 |
| 2021 | 58°F | 14 |
| 2022 | 58°F | 10 |
| 2023 | 61°F | 16 |
| 2024 | 60°F | 11 |
| 2025 | 63°F | 11 |
Checked against 30 local weather stations. How we check
Compare dates
August, September
or October?
| Typical conditions | Aug | Sep | Oct |
|---|---|---|---|
| Afternoons | 66°F | 59°F | 48°F |
| Sea | 57°F | 56°F | 53°F |
| Rain days | 14 | 14 | 15 |
| Overnight demand | 81% | 59% | 45% |
August: Warmer afternoons than September. More overnight demand. August guide →
October: Cooler afternoons and cooler sea than September. Less overnight demand. October guide →
Overnight demand measures accommodation stays, not queues. Sea temperatures are monthly coastal averages.
Compare any of the 12 monthsChoose another month and compare it with September Show comparisonHide comparison
Yellow marks the top three months on the Balanced mix. September stays as your reference.
July to August have a Weather score at least 1.0 point higher than September, but more overnight stays.
Your comparison
September or August?
Overnight stays are 81% of the busiest month.
Historical regional hotel revenue (2024–2025 monthly average): €129 per occupied room-night. An average, not a booking quote.
Read the August guide →| Typical conditions | September | August |
|---|---|---|
| Afternoons | 59°F | 66°F |
| Nights | 46°F | 51°F |
| Sea | 56°F | 57°F |
| Rain days | 14 | 14 |
| Visitor season | Moderate season | Busy season |
| Overall / 10 | 5.8 | 5.8 |
| Month rank | #3 | #2 |
Every month, in detail Show detailsHide details
| Month | Overall | Rank | High | Low | Sea | Rain days | Weather | Visitor season |
|---|---|---|---|---|---|---|---|---|
| January | 4.9 | #11 | 30°F | 24°F | 44°F | 14 | 2.9 | Low season |
| February | 5.1 | #9 | 34°F | 25°F | 43°F | 12 | 3.4 | Moderate season |
| March | 5.0 | #10 | 40°F | 28°F | 43°F | 14 | 3.6 | Moderate season |
| April | 5.7 | #4 | 48°F | 33°F | 43°F | 13 | 4.7 | Moderate season |
| May | 6.2 | #1 | 58°F | 42°F | 46°F | 12 | 6.3 | Moderate season |
| June | 5.6 | #6 | 64°F | 48°F | 52°F | 14 | 6.7 | Busy season |
| July | 5.6 | #5 | 68°F | 53°F | 56°F | 14 | 7.3 | Peak season |
| August | 5.8 | #2 | 66°F | 51°F | 57°F | 14 | 7.1 | Busy season |
| September | 5.8 | #3 | 59°F | 46°F | 56°F | 14 | 5.9 | Moderate season |
| October | 5.4 | #7 | 48°F | 38°F | 53°F | 15 | 4.2 | Moderate season |
| November | 5.2 | #8 | 38°F | 31°F | 49°F | 14 | 3.6 | Moderate season |
| December | 4.8 | #12 | 32°F | 27°F | 46°F | 15 | 2.8 | Low season |
Near here
Nearby places in September
Nearby regions, nearest first. Distances are centre to centre, as the crow flies; they are not road distances or journey times.
Elsewhere in Europe
Better September weather than Trondheim & Trøndelag
Trondheim & Trøndelag's weather ranks 116 of 117 countryside regions this month. These countryside regions outside Norway have clearly better weather on your dates, nearest first, each compared with Trondheim & Trøndelag.
Dalarna & North Middle Swedenabout 230 miles
Very good weather (7.2): 3°F warmer afternoons, 5 fewer rain days, quieter for its season (low season), cheaper
Småland & the islandsSweden · about 470 miles
Very good weather (7.7): 5°F warmer afternoons, 6 fewer rain days, quieter for its season (low season), cheaper
Central & western Lithuaniaabout 720 miles
Very good weather (8.3): 7°F warmer afternoons, 5 fewer rain days, cheaper
LüneburgLower Saxony · Germany · about 730 miles
Very good weather (8.6): 9°F warmer afternoons, 5 fewer rain days, cheaper
Weser-Ems & the North Sea coastLower Saxony · Germany · about 760 miles
Very good weather (8.5): 9°F warmer afternoons, 4 fewer rain days, busier for its season (busy season), cheaper
How we knowSources, regional scope & scoring method Show detailsHide details
It's moderate season, 59% of the busiest month and 8% above its average month. That means about 8,800 overnight visitors on a typical September night across the region, 77% of them from Norway itself. Rentals booked through Airbnb, Booking, Expedia and Tripadvisor add up to 1,300 more: 15 for every 100 counted above. Some are the same properties counted twice.
| Climate suitability (HCI:Urban, 0–100) | 64 |
| How our weather was checked | 30 open weather stations in this region, January and July: afternoon highs typically within 2°F (1.1°C), night lows within 1°F (0.1°C). |
| Tourist nights per 1,000 residents per day | 18 |
| Busiest month here | July · 31 |
| Visitors as share of people present | 1.8% |
| Rank among Europe's regions this month | 58th percentile |
| Domestic share of nights | 77% |
| Platform rental nights per 100 counted nights | 15 |
| Visitor share if every platform night were extra | 2.0% |
| Population used | 487,000 |
| Statistical region | NO06 · Trøndelag/Trööndelage |
Crowds: Eurostat nights spent at tourist accommodation, by month and NUTS 2 region, 2024–2025 average. Overnight visitors per night is the month's nights divided by its days; the per-1,000 figure is Eurostat's, against each year's population. Platform rentals: Eurostat nights booked via Airbnb, Booking, Expedia and Tripadvisor, 2024–2025 average, shown separately because some properties are in both counts. Weather: Holiday Climate Index computed from ERA5 reanalysis with daily highs, night lows and rain days corrected from open national weather-service station records, 2011–2025, population-weighted to the region; day-by-day figures are the same data averaged by date. Heat and rain odds are counted across those years. Sunrise and sunset: NOAA solar equations, local time. Prices: Eurostat price level index and HICP, national; the first figure is regional (Statistics Norway (SSB), table 14168: hotel accommodation revenue per occupied room). Full method · this region's data.