San Diego has a warm subtropical climate with warm summers and mild winters.
Temperatures peak in August and drop to their lowest in January, while rainfall is highest during winter months.
Humidity remains moderate throughout the year, especially in spring, creating warm and dry conditions.
| Month | 🌤️ | High | Low | Avg | Humid % | Rain (mm) | Wind (m/s) | Solar (kWh/m²) |
|---|---|---|---|---|---|---|---|---|
| January | 🌤️ | 73.4°F | 34.2°F | 53.8°F | 63% | 66 | 2.4 | 3.20 |
| February | 🌤️ | 75.9°F | 35.5°F | 55.7°F | 65% | 73 | 2.4 | 4.00 |
| March | ☀️ | 80.4°F | 37.8°F | 59.1°F | 66% | 58 | 2.5 | 5.12 |
| April | ☀️ | 86.9°F | 41.0°F | 63.9°F | 63% | 22 | 2.6 | 6.10 |
| May | ☀️ | 91.1°F | 45.5°F | 68.3°F | 62% | 8 | 2.7 | 6.12 |
| June | 🌞 | 97.4°F | 48.8°F | 73.1°F | 54% | 2 | 2.5 | 6.01 |
| July | 🌞 | 100.8°F | 54.6°F | 77.7°F | 47% | 6 | 2.3 | 6.12 |
| August | 🌞 | 102.2°F | 55.7°F | 79.0°F | 46% | 10 | 2.1 | 6.08 |
| September | 🌞 | 100.5°F | 52.9°F | 76.7°F | 50% | 10 | 2.0 | 5.28 |
| October | ☀️ | 92.2°F | 47.5°F | 69.9°F | 53% | 16 | 2.1 | 4.23 |
| November | ☀️ | 83.1°F | 39.4°F | 61.2°F | 55% | 34 | 2.2 | 3.47 |
| December | 🌤️ | 74.5°F | 34.2°F | 54.3°F | 61% | 53 | 2.3 | 2.91 |
Showing average climate conditions across 45 years (1981–2025)
🧥 Light layers are sufficient — this Mild Winter stays cool without prolonged hard freezes.
🌤️ Limit midday outdoor exposure and stay hydrated — this is an intense Hot Summer.
☔ Rainfall is spread across the year with no sharply defined wet season.
Monthly averages · 1981–2025 climate normals · °F
Temperatures rise steadily from spring, peak in August, and gradually decline through autumn into winter.
These seasonal patterns offer comfortable conditions year-round, with warm summers and mild winters.
Monthly rainfall · 1981–2025 seasonal trends · mm/month
Monthly averages · 1981–2025
💧 Humidity peaks at 66% in March · annual avg 57%
The warmest year in San Diego's recorded history was 2014 (avg: 69.1°F), while the coldest was 1982 (avg: 63.5°F).
Average annual high/low · Last 10 years · °F
Total annual precipitation · Last 10 years · mm/year
| Year | Min Temp | Avg Temp | Max Temp | Rainfall (mm) | Avg Humidity | Avg Wind |
|---|---|---|---|---|---|---|
2025 | 46.4°F | 68.2°F | 90.0°F | 319 | 58% | 2.3 m/s |
2024 | 45.5°F | 66.9°F | 88.3°F | 327 | 58% | 2.2 m/s |
2023 | 44.2°F | 64.9°F | 85.6°F | 520 | 63% | 2.4 m/s |
2022 | 45.0°F | 67.1°F | 89.2°F | 226 | 55% | 2.3 m/s |
2021 | 45.3°F | 68.0°F | 90.5°F | 271 | 55% | 2.3 m/s |
2020 | 45.0°F | 67.8°F | 90.7°F | 304 | 56% | 2.2 m/s |
2019 | 43.3°F | 64.4°F | 85.3°F | 591 | 60% | 2.3 m/s |
2018 | 45.3°F | 68.0°F | 90.5°F | 260 | 55% | 2.3 m/s |
2017 🔥 | 44.8°F | 68.0°F | 91.2°F | 329 | 56% | 2.3 m/s |
2016 | 44.6°F | 67.1°F | 89.4°F | 367 | 56% | 2.4 m/s |
Showing 1 to 10 of 45 years
Based on 45 years of data (1981–2025), August is typically the hottest month in San Diego, California, with average high temperatures around 102.2°F.
January is the coldest month in San Diego, with average low temperatures around 34.2°F.
February receives the most rainfall with approximately 73 mm, while June is the driest with 2 mm.
The highest recorded temperature was 110.8°F in September 2020. This is part of the historical record spanning 1981–2025.
The lowest recorded temperature was 26.6°F in December 1990.
This page covers 45 years of climate data from 1981 to 2025. As new data is added to the database the page automatically reflects the updated coverage.
San Diego receives the most sunlight in May with an average solar radiation of 6.12 kWh/m²/day. This solar radiation data, sourced from NASA POWER, is useful for solar energy planning and agriculture in California.
All climate data is sourced from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite and model data. It provides monthly averages for temperature, precipitation, humidity, wind speed, and solar radiation.
All weather data is sourced from NASA POWER (Prediction of Worldwide Energy Resources), a NASA project providing solar and meteorological data for renewable energy, building efficiency, and agricultural research.
