GRANDTOTALITY
GRANDTOTALITY · 2 AUGUST 2027

2027 Eclipse Weather: Compare Historical Clear-Sky Conditions

Where has the best chance of clear skies? GrandTotality can compare historical conditions, but its data cannot calculate a reliable probability of clear skies at the eclipse hour. The stored NASA POWER snapshots cover 26 July–9 August in 2016–2025. Daily mean cloud is a useful regional comparison, not a weather forecast for 2027.

Compare the available weather grids

The table uses one representative destination for each of 14 stored grids matched to detailed totality pages. Other catalogue locations may have no stored sample. A missing sample is not a clear-sky result.

Available regional weather samples, from lower to higher mean cloud
LocationTotalityLocal maximum · 2 August 2027Centre-line distance ≈Historical daily cloudNearby airport
DenderaEgypt6m 14s13:04:34Africa/Cairo27.0 km9.3% mean150 days · 2016–2025Luxor International Airport (LXR)52 km straight-line
AbydosEgypt6m 21s13:02:57Africa/Cairo12.8 km9.3% mean150 days · 2016–2025Suhaj International Airport (HMB)25 km straight-line
Siwa OasisEgypt5m 29s12:45:16Africa/Cairo64.6 km9.9% mean150 days · 2016–2025Mersa Matruh International Airport (MUH)287 km straight-line
Mummification MuseumEgypt6m 21s13:05:12Africa/Cairo14.3 km11.8% mean150 days · 2016–2025Luxor International Airport (LXR)8 km straight-line
TarifaSpain4m 39s10:47:24Europe/Madrid34.6 km12.2% mean150 days · 2016–2025Jerez Airport (XRY)91 km straight-line
Baelo ClaudiaSpain4m 30s10:47:14Europe/Madrid43.8 km12.2% mean150 days · 2016–2025Jerez Airport (XRY)77 km straight-line
SfaxTunisia5m 40s10:11:35Africa/Tunis19.3 km13.8% mean150 days · 2016–2025Sfax Thyna International Airport (SFA)7 km straight-line
El JemTunisia4m 25s10:11:19Africa/Tunis78.6 km18.8% mean150 days · 2016–2025Monastir Habib Bourguiba International Airport (MIR)52 km straight-line
CádizSpain2m 54s10:46:48Europe/Madrid94.7 km22.0% mean150 days · 2016–2025Jerez Airport (XRY)32 km straight-line
TimgadAlgeria5m 20s10:04:10Africa/Algiers30.1 km22.3% mean150 days · 2016–2025Batna Mostefa Ben Boulaid Airport (BLJ)33 km straight-line
Ghoufi CanyonAlgeria5m 25s10:03:43Africa/Algiers20.9 km22.3% mean150 days · 2016–2025Biskra - Mohamed Khider Airport (BSK)49 km straight-line
JeddahSaudi Arabia5m 56s13:25:11Asia/Riyadh39.0 km39.6% mean150 days · 2016–2025King Abdulaziz International Airport (JED)15 km straight-line
BosasoSomalia4m 00s14:00:10Africa/Mogadishu89.7 km48.5% mean150 days · 2016–2025Bender Qassim International Airport (BSA)5 km straight-line
Sana’aYemen2m 18s13:45:18Asia/Aden119.4 km67.4% mean150 days · 2016–2025Sanaa International Airport (SAH)12 km straight-line

What the numbers measure

Mean cloud averages daily cloud-cover percentages; median cloud describes the middle sampled day. “Mostly clear” means a daily mean at or below 20%, and does not mean the Sun was unobstructed at maximum eclipse. Cloud data has an approximately 1° resolution. Nearby sites can share a grid and should not be interpreted as independent weather observations.

Read a sample in detail

Dendera has 9.3% mean daily cloud and 4.7% median cloud in 150 seasonal daily observations. 87.3% of those days meet the daily “mostly clear” threshold. This is the lowest mean among the detailed totality destinations with stored observations, not a comprehensive global ranking.

Visit a destination page for sample dates, retrieval date, temperature and rain context. Check current weather forecasts nearer the trip and retain flexibility where practical. NASA POWER source and documentation; GrandTotality’s method and limitations.

Calculated astronomy uses NASA / Fred Espenak Besselian elements, a sea-level WGS84 observer and a smooth lunar limb. Historical weather is regional context, not a forecast. Airport routes, site access, travel advice and accommodation availability require current checks. Read the Sources & method.