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Biarritz vs Castries
Comparing Biarritz change · Castries change
Castries is the warmer of the two — about 13°C on the annual average; Castries is the wetter, with 489 mm more rain a year, and Castries the sunnier.
How the seasons compare
The differences between Biarritz and Castries, in everyday terms.
Summers
Castries has hotter summers
Biarritz: Mild
Castries: Warm
Winters
Castries has far milder winters
Biarritz: Cool
Castries: Stays warm
Rain & snow
Castries is wetter
Biarritz: Wet
Castries: Very wet
Sky
Castries is sunnier
Biarritz: Often cloudy
Castries: Fairly sunny
Month-by-month charts
Temperature
Castries is the warmer of the two — about 13°C on the annual average.
Precipitation
Castries is the wetter — about 489 mm more across the year.
Clear skies
Castries has the clearer skies — the higher line.
Exact monthly numbers
Tap a metric to open its full table. Desktop shows all twelve months; on a phone each metric splits into Jan–Jun and Jul–Dec.
Avg high (°C) Castries runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Biarritz | 12 | 13 | 15 | 17 | 20 | 22 | 24 | 25 | 23 | 20 | 15 | 13 |
| Castries | 27 | 27 | 27 | 28 | 28 | 28 | 28 | 29 | 29 | 29 | 28 | 27 |
| Difference | +15 | +14 | +12 | +11 | +8 | +6 | +4 | +4 | +6 | +8 | +13 | +14 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Biarritz | 12 | 13 | 15 | 17 | 20 | 22 |
| Castries | 27 | 27 | 27 | 28 | 28 | 28 |
| Difference | +15 | +14 | +12 | +11 | +8 | +6 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Biarritz | 24 | 25 | 23 | 20 | 15 | 13 |
| Castries | 28 | 29 | 29 | 29 | 28 | 27 |
| Difference | +4 | +4 | +6 | +8 | +13 | +14 |
Avg low (°C) Castries runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Biarritz | 5 | 5 | 7 | 9 | 12 | 15 | 17 | 17 | 14 | 12 | 8 | 6 |
| Castries | 26 | 25 | 25 | 26 | 27 | 27 | 27 | 28 | 28 | 28 | 27 | 26 |
| Difference | +21 | +20 | +18 | +17 | +15 | +12 | +10 | +10 | +13 | +16 | +19 | +21 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Biarritz | 5 | 5 | 7 | 9 | 12 | 15 |
| Castries | 26 | 25 | 25 | 26 | 27 | 27 |
| Difference | +21 | +20 | +18 | +17 | +15 | +12 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Biarritz | 17 | 17 | 14 | 12 | 8 | 6 |
| Castries | 27 | 28 | 28 | 28 | 27 | 26 |
| Difference | +10 | +10 | +13 | +16 | +19 | +21 |
Precipitation (mm) Varies through the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Biarritz | 140 | 110 | 103 | 118 | 116 | 99 | 77 | 87 | 118 | 147 | 207 | 151 |
| Castries | 113 | 76 | 66 | 90 | 114 | 134 | 216 | 291 | 224 | 246 | 243 | 149 |
| Difference | -26 | -35 | -36 | -28 | -2 | +34 | +139 | +204 | +106 | +99 | +36 | -1 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Biarritz | 140 | 110 | 103 | 118 | 116 | 99 |
| Castries | 113 | 76 | 66 | 90 | 114 | 134 |
| Difference | -26 | -35 | -36 | -28 | -2 | +34 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Biarritz | 77 | 87 | 118 | 147 | 207 | 151 |
| Castries | 216 | 291 | 224 | 246 | 243 | 149 |
| Difference | +139 | +204 | +106 | +99 | +36 | -1 |
Cloud cover (%) Biarritz runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Biarritz | 73 | 69 | 67 | 70 | 70 | 66 | 63 | 62 | 61 | 68 | 73 | 73 |
| Castries | 38 | 39 | 42 | 49 | 52 | 59 | 50 | 46 | 51 | 51 | 46 | 41 |
| Difference | -35 | -30 | -26 | -21 | -18 | -8 | -13 | -16 | -11 | -16 | -27 | -33 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Biarritz | 73 | 69 | 67 | 70 | 70 | 66 |
| Castries | 38 | 39 | 42 | 49 | 52 | 59 |
| Difference | -35 | -30 | -26 | -21 | -18 | -8 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Biarritz | 63 | 62 | 61 | 68 | 73 | 73 |
| Castries | 50 | 46 | 51 | 51 | 46 | 41 |
| Difference | -13 | -16 | -11 | -16 | -27 | -33 |
Relative humidity (%) Varies through the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Biarritz | 86 | 84 | 82 | 80 | 79 | 77 | 74 | 70 | 72 | 78 | 84 | 86 |
| Castries | 76 | 75 | 75 | 76 | 77 | 79 | 79 | 79 | 79 | 79 | 79 | 77 |
| Difference | -11 | -9 | -7 | -4 | -2 | +1 | +5 | +9 | +7 | +2 | -5 | -9 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Biarritz | 86 | 84 | 82 | 80 | 79 | 77 |
| Castries | 76 | 75 | 75 | 76 | 77 | 79 |
| Difference | -11 | -9 | -7 | -4 | -2 | +1 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Biarritz | 74 | 70 | 72 | 78 | 84 | 86 |
| Castries | 79 | 79 | 79 | 79 | 79 | 77 |
| Difference | +5 | +9 | +7 | +2 | -5 | -9 |
How both climates are changing
Both cities are warming. Each city has its own warming trend; see its trends page for the year-by-year detail. Biarritz trends → · Castries trends →
Methodology & sources
Biarritz
Temperature & precipitation — 1991–2020 normals computed from 30 years of daily observations at Biarritz-pays-basque, a weather station, about 2 km from the city centre. The underlying daily records come from NOAA's global station network.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.
Castries
Temperature — modelled for this location from ERA5-Land reanalysis, a ~9 km global grid, because no long-record weather station is close enough to use.
Precipitation — 1991–2020 normals computed from 10 years of daily observations at LE Lamentin, a weather station, about 66 km from the city centre. The underlying daily records come from NOAA's global station network.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.
← change Biarritz · change Castries → · Biarritz page · Castries page