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Northern lights Cambridge tonight

Cambridge sits at ~52°N magnetic latitude in flat Cambridgeshire. Kp 6-7 is the practical threshold. The Fens north of Ely are among the darkest accessible land in eastern England, just 20-30 minutes from the city.

Aurora visibility — Cambridge

Unlikely tonight

Kp 1 is well below the Kp 6-7 threshold needed for aurora to be visible from Cambridge.

Current Kp

1

of 9

Threshold for Cambridge: Kp 6-7 Magnetic latitude: ~52°N Updated: 10 May, 11:04 UTC

What Kp is needed here?

Cambridge sits at a magnetic latitude of approximately 52°N. The Kp index - a global measure of geomagnetic activity on a scale from 0 (quiet) to 9 (extreme storm), updated every 3 hours - needs to reach Kp 6-7 before the auroral oval expands far enough south to be visible from here.

At Kp 6-7, visibility is possible from Cambridge but skies need to be clear and dark. Cloud cover and light pollution remain the main obstacles even when Kp is high enough.

Best dark sky sites near Cambridge

Light pollution is the biggest obstacle after cloud cover. These sites give you the best dark northern horizon within reach.

The Fens - north Cambridgeshire

The flat fenland north of Cambridge toward Ely and March is among the least light-polluted agricultural land in the East of England. The completely flat horizon gives unobstructed sky from ground level in all directions. Dark enough for Bortle 4-5 conditions 20-30 minutes from the city.

Thetford Forest

The large Forestry Commission pine forest on the Norfolk/Suffolk border, about 35 minutes north-east of Cambridge. Forest clearings give Bortle 4 conditions with dark canopy horizon. High Lodge visitor centre gives access points.

Grafham Water

A large reservoir north-west of Cambridge near Huntingdon, about 20 minutes by car. Open water gives a clear north-facing horizon. The west bank gives north-north-west sky access with minimal settlement behind.

Newmarket Heath and the chalk escarpment

The open chalk grassland around Newmarket Heath and the Gog Magog Hills east of Cambridge gives elevated positions at Bortle 5 conditions. Better than central Cambridge but not as dark as the Fens or Thetford.

Other UK aurora forecasts

UK overview Norwich London Lincoln

Related pages

Northern Lights UK

Live aurora forecast hub for all UK regions.

Northern Lights Norwich Tonight

Norwich is north-east with the north Norfolk dark coast.

Northern Lights London Tonight

London is south with a higher Kp threshold.

What Is the Kp Index?

What Kp 6-7 means for viewing from East Anglia.

Tips for Viewing the Northern Lights

How to plan a dark sky watch from a flat-terrain city.

Common questions

Aurora watching from Cambridge and East Anglia.

Can you see the northern lights from Cambridge?
During major geomagnetic storms (Kp 7+) aurora has been seen from Cambridge outskirts and from dark sites nearby. At Kp 6, Grafham Water or the Fens north of Ely give better conditions. Cambridge sits at ~52°N magnetic latitude requiring a moderate geomagnetic storm.
What Kp is needed for aurora near Cambridge?
Kp 6-7 from dark sites such as the Fens, Thetford Forest, or Grafham Water. The flat Cambridgeshire terrain means wide northern horizons are available without driving far. The Fens give the most open sky, while Thetford Forest gives darker conditions.
Is the Fens dark enough for aurora watching?
Yes. The fenland north of Cambridge is one of the least built-up areas in eastern England. The completely flat terrain and minimal settlement give open Bortle 4-5 conditions that are unusual this far south. The wide unobstructed horizon means aurora on the northern sky is visible without elevation.
Where is Grafham Water for aurora watching?
Grafham Water is a large reservoir near St Neots and Huntingdon, about 20 minutes west of Cambridge. The north bank gives an open water horizon facing north and north-west. It is one of the most accessible dark-enough sites from Cambridge and practical for even a short notice trip.
How does Cambridge compare to London for aurora?
Cambridge is slightly further north at ~52°N magnetic latitude versus London's ~51°N. This gives a marginally lower Kp threshold. Cambridge also has flatter, less developed surrounding land - the Fens are substantially darker than anything within practical range of London. For aurora from East Anglia, Cambridge is meaningfully better positioned.