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Imperial Beach, California climate
BSk Cold semi-arid
Imperial Beach has a mildly seasonal mild-temperate climate (Cold semi-arid, Köppen BSk). The hottest month is August with an average daily high near 24°C, while the coldest is December averaging around 8°C at night. Precipitation totals about 218 mm a year and is strongly seasonal — February alone averages 53 mm while August barely receives 1 mm.
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresClear vs cloudy days
Share of days each month that are clear, partly cloudy or cloudy · 1991–2020 · hover a month for the day countsImperial Beach climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 20 | 19 | 19 | 19 | 20 | 21 | 23 | 24 | 24 | 23 | 21 | 19 |
| Avg temp (°C) | 14 | 14 | 15 | 15 | 17 | 18 | 20 | 21 | 20 | 18 | 16 | 14 |
| Avg low (°C) | 9 | 9 | 11 | 11 | 14 | 16 | 18 | 18 | 17 | 14 | 10 | 8 |
| Precipitation (mm) | 43 | 53 | 47 | 15 | 3 | 2 | 8 | 1 | 4 | 11 | 20 | 11 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 20 | 19 | 19 | 19 | 20 | 21 |
| Avg temp (°C) | 14 | 14 | 15 | 15 | 17 | 18 |
| Avg low (°C) | 9 | 9 | 11 | 11 | 14 | 16 |
| Precipitation (mm) | 43 | 53 | 47 | 15 | 3 | 2 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 23 | 24 | 24 | 23 | 21 | 19 |
| Avg temp (°C) | 20 | 21 | 20 | 18 | 16 | 14 |
| Avg low (°C) | 18 | 18 | 17 | 14 | 10 | 8 |
| Precipitation (mm) | 8 | 1 | 4 | 11 | 20 | 11 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 4 | 4 | 4 | 2 | 0.8 | 0.1 | 0.4 | 0.2 | 0.5 | 0.5 | 2 | 3 |
| Days with high ≥ 32°C (days) | 0.2 | 0.1 | 0.1 | 0.2 | 0.2 | 0.0 | 0.1 | 0.2 | 0.9 | 0.5 | 0.6 | 0.6 |
| Days with low ≤ 0°C (days) | 0.3 | — | 0.1 | — | — | — | — | — | 0.1 | — | 0.1 | 0.8 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 4 | 4 | 4 | 2 | 0.8 | 0.1 |
| Days with high ≥ 32°C (days) | 0.2 | 0.1 | 0.1 | 0.2 | 0.2 | 0.0 |
| Days with low ≤ 0°C (days) | 0.3 | — | 0.1 | — | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 0.4 | 0.2 | 0.5 | 0.5 | 2 | 3 |
| Days with high ≥ 32°C (days) | 0.1 | 0.2 | 0.9 | 0.5 | 0.6 | 0.6 |
| Days with low ≤ 0°C (days) | — | — | 0.1 | — | 0.1 | 0.8 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 51 | 56 | 58 | 55 | 66 | 73 | 69 | 61 | 56 | 53 | 46 | 48 |
| Clear days (≤ 30% cloud) | 10 | 7 | 7 | 7 | 5 | 3 | 3 | 5 | 7 | 10 | 11 | 12 |
| Partly cloudy days (30–70%) | 10 | 9 | 11 | 11 | 10 | 8 | 11 | 12 | 11 | 9 | 11 | 10 |
| Cloudy days (≥ 70%) | 11 | 12 | 13 | 11 | 16 | 19 | 17 | 13 | 12 | 12 | 9 | 10 |
| Relative humidity (%) | 65 | 68 | 69 | 67 | 68 | 64 | 59 | 56 | 58 | 60 | 59 | 63 |
| Wind speed (mph) | 5.6 | 5.7 | 5.3 | 5.7 | 5.5 | 5.0 | 4.7 | 4.4 | 4.3 | 4.6 | 5.1 | 5.7 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 51 | 56 | 58 | 55 | 66 | 73 |
| Clear days (≤ 30% cloud) | 10 | 7 | 7 | 7 | 5 | 3 |
| Partly cloudy days (30–70%) | 10 | 9 | 11 | 11 | 10 | 8 |
| Cloudy days (≥ 70%) | 11 | 12 | 13 | 11 | 16 | 19 |
| Relative humidity (%) | 65 | 68 | 69 | 67 | 68 | 64 |
| Wind speed (mph) | 5.6 | 5.7 | 5.3 | 5.7 | 5.5 | 5.0 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 69 | 61 | 56 | 53 | 46 | 48 |
| Clear days (≤ 30% cloud) | 3 | 5 | 7 | 10 | 11 | 12 |
| Partly cloudy days (30–70%) | 11 | 12 | 11 | 9 | 11 | 10 |
| Cloudy days (≥ 70%) | 17 | 13 | 12 | 12 | 9 | 10 |
| Relative humidity (%) | 59 | 56 | 58 | 60 | 59 | 63 |
| Wind speed (mph) | 4.7 | 4.4 | 4.3 | 4.6 | 5.1 | 5.7 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Imperial Beach Ream Fld Nas (NOAA GHCN station USW00093115), about 2 km from the city centre.
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.