Costa Mesa weather by month
Introduction
Costa Mesa, located on California’s sunny Orange County coast, offers a pleasant Mediterranean climate. Whether you’re planning a move, a vacation, or simply curious about how the weather shifts each month, this guide provides a month‑by‑month breakdown of average highs, lows, and rainfall. With vivid, SEO‑friendly headings and an easy‑to‑read table, you’ll quickly grasp what to expect throughout the year.
Annual Climate Overview
Costa Mesa enjoys mild winters, warm summers, and minimal seasonal extremes.
- Average annual temperature: 68 °F (20 °C)
- Average annual rainfall: 16.7 in (424 mm)
- Sunshine: 300+ sunny days per year
The winter months bring the most rain, whereas summers are mostly dry and warm. Sea breezes from the Pacific keep temperatures comfortable even during the hottest months.
Monthly Weather Breakdown
January
- Avg. high: 65 °F (18 °C)
- Avg. low: 45 °F (7 °C)
- Rainy days: 10
- Precipitation: 2.2 in (56 mm)
February
- Avg. high: 66 °F (19 °C)
- Avg. low: 45 °F (7 °C)
- Rainy days: 9
- Precipitation: 2.6 in (66 mm)
March
- Avg. high: 68 °F (20 °C)
- Avg. low: 46 °F (8 °C)
- Rainy days: 8
- Precipitation: 2.2 in (56 mm)
April
- Avg. high: 70 °F (21 °C)
- Avg. low: 47 °F (8 °C)
- Rainy days: 6
- Precipitation: 2.1 in (53 mm)
May
- Avg. high: 73 °F (23 °C)
- Avg. low: 48 °F (9 °C)
- Rainy days: 2
- Precipitation: 0.9 in (23 mm)
June
- Avg. high: 76 °F (24 °C)
- Avg. low: 50 °F (10 °C)
- Rainy days: 0
- Precipitation: 0.6 in (15 mm)
July
- Avg. high: 78 °F (26 °C)
- Avg. low: 53 °F (12 °C)
- Rainy days: 0
- Precipitation: 0.2 in (5 mm)
August
- Avg. high: 79 °F (26 °C)
- Avg. low: 53 °F (12 °C)
- Rainy days: 0
- Precipitation: 0 in (0 mm)
September
- Avg. high: 78 °F (26 °C)
- Avg. low: 52 °F (11 °C)
- Rainy days: 1
- Precipitation: 0.6 in (15 mm)
October
- Avg. high: 75 °F (24 °C)
- Avg. low: 50 °F (10 °C)
- Rainy days: 2
- Precipitation: 1.3 in (33 mm)
November
- Avg. high: 71 °F (22 °C)
- Avg. low: 47 °F (8 °C)
- Rainy days: 6
- Precipitation: 2.8 in (71 mm)
Costa Mesa Weather Table
| Month | Avg. High (°F) | Avg. Low (°F) | Rainy Days | Precipitation (in) |
|---|---|---|---|---|
| January | 65 | 45 | 10 | 2.2 |
| February | 66 | 45 | 9 | 2.6 |
| March | 68 | 46 | 8 | 2.2 |
| April | 70 | 47 | 6 | 2.1 |
| May | 73 | 48 | 2 | 0.9 |
| June | 76 | 50 | 0 | 0.6 |
| July | 78 | 53 | 0 | 0.2 |
| August | 79 | 53 | 0 | 0 |
| September | 78 | 52 | 1 | 0.6 |
| October | 75 | 50 | 2 | 1.3 |
| November | 71 | 47 | 6 | 2.8 |
| December | 65 | 45 | 8 | 2.5 |
Values are averages based on historical climate data (1971–2000).
FAQs – Quick Answers About Costa Mesa Weather
Q1: When is the rainy season in Costa Mesa?
A1: The rainy season typically runs from December through April, with peak rainfall in February and March.
Q2: How hot does Costa Mesa get in the summer?
A2: Summer highs average between 76°F and 79°F (24–26°C); temperatures rarely exceed 84°F (29°C).
Q3: Is there any chance of snow or frost?
A3: No, snow and frost are extremely rare. The lowest temperature recorded is 30°F (−1°C) and occurs rarely.
Q4: Should I bring a raincoat during the spring?
A4: Yes, especially in March and April when showers are common and winds can be breezy.
Q5: What’s the best time to visit for outdoor activities?
A5: Late spring (May) and early fall (September–October) offer warm temperatures and minimal rainfall—ideal for beach and hiking trips.
Resources
- National Oceanic and Atmospheric Administration (NOAA) – Climate Data Online – Detailed historical climate records for Costa Mesa.
- Weather.com – Costa Mesa Weather Forecast – Current weather, hourly forecasts, and long‑term outlook.
- City of Costa Mesa – Local Planning & Environmental Reports** – City‑specific climate information and environmental initiatives.
- California Climate Change Services – California Climate Data – State‑wide climate summaries and projections.
- Travel + Leisure – California Weather Guide – Practical travel tips for visitors.
With this guide, you’ll have a solid grasp of Costa Mesa’s monthly weather patterns, enabling you to plan events, schedule outdoor adventures, or simply align your wardrobe with the California sunshine. Enjoy the pleasant climate that makes Costa Mesa a favorite spot for both residents and travelers alike!
