Tromsø vs Alta

Aurora forecast comparison — updated hourly

Tonight's Verdict
🇳🇴
Tromsø
Peak: Oct–Mar
Skip it
Maybe
Book it
☀️ Too bright — midnight sun
Kp tonight3.7
Clouds (ECMWF)100%
Aurora probability2%
🇳🇴
Alta
Peak: Oct–Mar
Skip it
Maybe
Book it
☀️ Too bright — midnight sun
Kp tonight3.7
Clouds (ECMWF)100%
Aurora probability2%
Head-to-Head
Metric🇳🇴 Tromsø🇳🇴 Alta
Latitude69.7°N70.1°N
Kp for overhead auroraKp 1+Kp 1+
Kp for good displayKp 3+Kp 3+
Cloud cover (ECMWF)100%100%
Cloud cover (GFS)100%100%
Dark hours––
Aurora probability2%2%
Solar wind speed415 km/s415 km/s
Bz value+4.0 nT+4.0 nT
Best window tonight22h (99%)22h (100%)

Highlighted cell = better value for aurora viewing

Next 3 Nights
Night🇳🇴 Tromsø🇳🇴 Alta
Thu, May 14
✗
100%
Kp 3.7
✗
100%
Kp 3.7
Fri, May 15
✓
3%
Kp 5.7
✓
10%
Kp 5.7
Sat, May 16
✓
36%
Kp 5.0
✗
100%
Kp 5.0
Which should I choose?

Tromsø vs Alta — Which should I choose?

Both cities require Kp 1+ to see aurora overhead, placing them at a similar position relative to the auroral oval. Tromsø: Inside the auroral oval — peak aurora season September to March. Alta: Aurora Capital of the World — darker skies and fewer crowds than Tromsø.

Full Forecasts
🇳🇴View full Tromsø forecast→🇳🇴View full Alta forecast→
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