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Oceanside, California climate
BSk Cold semi-arid
Oceanside has a mildly seasonal mild-temperate climate (Cold semi-arid, Köppen BSk). The hottest month is August with an average daily high near 22°C, while the coldest is December averaging around 8°C at night. Precipitation totals about 261 mm a year and is strongly seasonal — February alone averages 60 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 countsOceanside climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 17 | 17 | 17 | 17 | 18 | 19 | 21 | 22 | 22 | 21 | 19 | 17 |
| Avg temp (°C) | 13 | 13 | 14 | 15 | 16 | 18 | 20 | 20 | 20 | 18 | 15 | 13 |
| Avg low (°C) | 8 | 9 | 10 | 12 | 14 | 16 | 18 | 19 | 18 | 15 | 11 | 8 |
| Precipitation (mm) | 56 | 60 | 36 | 20 | 7 | 2 | 1 | 1 | 4 | 14 | 19 | 40 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 17 | 17 | 17 | 17 | 18 | 19 |
| Avg temp (°C) | 13 | 13 | 14 | 15 | 16 | 18 |
| Avg low (°C) | 8 | 9 | 10 | 12 | 14 | 16 |
| Precipitation (mm) | 56 | 60 | 36 | 20 | 7 | 2 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 21 | 22 | 22 | 21 | 19 | 17 |
| Avg temp (°C) | 20 | 20 | 20 | 18 | 15 | 13 |
| Avg low (°C) | 18 | 19 | 18 | 15 | 11 | 8 |
| Precipitation (mm) | 1 | 1 | 4 | 14 | 19 | 40 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 6 | 6 | 4 | 3 | 2 | 0.7 | 0.5 | 0.3 | 0.6 | 2 | 3 | 5 |
| Days with high ≥ 32°C (days) | — | — | — | 0.1 | 0.1 | — | — | 0.0 | 0.1 | 0.2 | 0.1 | — |
| Days with low ≤ 0°C (days) | 0.1 | — | — | — | — | — | — | 0.0 | — | — | — | — |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 6 | 6 | 4 | 3 | 2 | 0.7 |
| Days with high ≥ 32°C (days) | — | — | — | 0.1 | 0.1 | — |
| Days with low ≤ 0°C (days) | 0.1 | — | — | — | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 0.5 | 0.3 | 0.6 | 2 | 3 | 5 |
| Days with high ≥ 32°C (days) | — | 0.0 | 0.1 | 0.2 | 0.1 | — |
| Days with low ≤ 0°C (days) | — | 0.0 | — | — | — | — |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 44 | 46 | 44 | 40 | 43 | 39 | 34 | 27 | 29 | 35 | 34 | 41 |
| Clear days (≤ 30% cloud) | 13 | 11 | 12 | 13 | 11 | 11 | 15 | 18 | 17 | 16 | 15 | 14 |
| Partly cloudy days (30–70%) | 9 | 9 | 12 | 11 | 15 | 15 | 14 | 12 | 10 | 10 | 10 | 9 |
| Cloudy days (≥ 70%) | 9 | 8 | 8 | 6 | 6 | 4 | 2 | 1.0 | 3 | 5 | 5 | 7 |
| Relative humidity (%) | 71 | 73 | 75 | 75 | 78 | 78 | 76 | 73 | 72 | 71 | 68 | 68 |
| Wind speed (mph) | 5.7 | 6.4 | 6.2 | 6.5 | 6.0 | 5.1 | 4.8 | 4.9 | 5.1 | 5.1 | 5.5 | 6.1 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 44 | 46 | 44 | 40 | 43 | 39 |
| Clear days (≤ 30% cloud) | 13 | 11 | 12 | 13 | 11 | 11 |
| Partly cloudy days (30–70%) | 9 | 9 | 12 | 11 | 15 | 15 |
| Cloudy days (≥ 70%) | 9 | 8 | 8 | 6 | 6 | 4 |
| Relative humidity (%) | 71 | 73 | 75 | 75 | 78 | 78 |
| Wind speed (mph) | 5.7 | 6.4 | 6.2 | 6.5 | 6.0 | 5.1 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 34 | 27 | 29 | 35 | 34 | 41 |
| Clear days (≤ 30% cloud) | 15 | 18 | 17 | 16 | 15 | 14 |
| Partly cloudy days (30–70%) | 14 | 12 | 10 | 10 | 10 | 9 |
| Cloudy days (≥ 70%) | 2 | 1.0 | 3 | 5 | 5 | 7 |
| Relative humidity (%) | 76 | 73 | 72 | 71 | 68 | 68 |
| Wind speed (mph) | 4.8 | 4.9 | 5.1 | 5.1 | 5.5 | 6.1 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Oceanside Marina (NOAA GHCN station USC00046377), 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.