How many Eastern Pacific hurricanes will there be this year?

Eastern Pacific hurricane activity typically declines significantly by October and November. The climatological likelihood of Eastern Pacific hurricane formation in October and November 2026 is generally low, as activity rapidly decreases after late September, with the official season concluding on November 30 ^[4]. Historically, the basin's activity peaks in late August, and the 1991–2020 annual average includes 15 named storms, 8 hurricanes, and 4 major hurricanes ^[1]. However, an unusually strong El Niño materially increases these odds by creating a more favorable environment characterized by reduced wind shear and warmer eastern-Pacific sea surface temperatures ^[4].

A very strong El Niño is significantly increasing late-season hurricane potential. As of September 10, 2026, the NOAA Climate Prediction Center reported a strengthening El Niño, with eastern-equatorial-Pacific sea surface temperature anomalies exceeding +3.0°C, assigning a greater than 90% probability to a very strong event during fall/winter 2026–27 ^[2]. El Niño enhances central and eastern-Pacific hurricane activity by creating conditions that favor vertically organized thunderstorms and reducing vertical wind shear ^[5]. Given this strong ENSO signal and the fact that the Eastern Pacific had already recorded 13 named storms, 4 hurricanes, and 2 major hurricanes by September 3, 2026, with accumulated cyclone energy 25% above normal, one or more additional Eastern Pacific hurricanes in October are plausible. November formation, however, remains possible but should be considered a low-probability outcome ^[4].

Kalshi's market showed a broader, lower hurricane probability distribution than NOAA. Kalshi's market probabilities for Eastern Pacific hurricanes in September 2026 presented a much broader and lower-centered distribution compared to NOAA's official May 21, 2026 forecast. NOAA's forecast concentrated its 70% confidence range at 9–14 hurricanes ^[1]. In contrast, Kalshi's pricing in late September implied that NOAA's lower bound of 9 was far from certain, and suggested 10-plus hurricanes were roughly a coin flip or less ^[1]. Specifically, Kalshi's market indicated approximately an 85% probability for at least 7 hurricanes, 77% for at least 8, and only about 41–44% for at least 10 ^[1].

Kalshi's September 30 market implied specific probabilities for various hurricane thresholds. As of September 30, 2026, Kalshi's market for total Eastern Pacific hurricanes (Category 1 or higher, May 15 through December 1, 2026) implied an 88% probability for more than 5 hurricanes, 85% for more than 6, 77% for more than 7, and 49% for more than 8 ^[2]. For more than 9 hurricanes, the market suggested about 41%, while Kalshi's own page showed more than 9 at 44%, more than 10 at 38%, and more than 11 at 29% ^[2]. It is important to note that this comparison is not perfectly like-for-like, as NOAA provides a full-season probabilistic forecast, while Kalshi prices threshold contracts from snapshots during September ^[1][2]. By September 2, 2026, NOAA's National Hurricane Center had already listed 13 named storms but only 3 hurricanes, indicating that Kalshi's September probabilities were informed by significant season-to-date information and should not be considered a direct, contemporaneous version of the May outlook ^[1][3].

The 2026 Eastern Pacific hurricane season shows mixed activity through September 3. Through this date, the season produced 4 hurricanes, 13 named storms, and 2 major hurricanes, alongside an Accumulated Cyclone Energy (ACE) of 84.4 x 10^4 kt2, which is 25% above the 1991–2020 normal ^[1][2]. Despite these elevated metrics, the season's hurricane formation pace lags behind climatological norms, as the normal cumulative sixth and seventh Eastern Pacific hurricanes typically form around September 15 and September 28, respectively ^[4].

The 2026 season's activity is less than record El Niño years. Through early September, the 2026 season's activity was not comparable to the record-setting El Niño years of 1997 and 2015, which concluded with 9 and 13 hurricanes, respectively, significantly surpassing the 1991–2020 average of 8 hurricanes ^[3]. Based on observed activity and late-season expectations, the 2026 season is projected to finish with 6–7 total hurricanes, combining the four already observed with an anticipated two or three additional storms ^[3][4][1]. This projected total would place the season above the normal cumulative pace but still below the exceptional hurricane counts of the 1997 and 2015 El Niño years ^[3][4][1].

The NHC's HURDAT2 database defines official Eastern Pacific hurricane counts. The official final count of Eastern Pacific hurricanes for 2026 will be determined by the National Hurricane Center’s (NHC) Northeast/North Central Pacific HURDAT2 best-track database, specifically the 2026 East Pacific season record and its associated NHC Tropical Cyclone Reports (TCRs) ^[1][2][3]. This database is considered the controlling NOAA source, overriding forecast outlooks or third-party datasets ^[1][2][3]. For the Eastern Pacific, the NHC's operational area extends westward from the North and Central American coast to 140°W, with the Central Pacific Hurricane Center (CPHC) covering the region from 140°W to 180°W ^[4][6].

Post-storm analysis determines hurricane counts using comprehensive data. The official methodology for determining hurricane counts is NHC/CPHC post-storm analysis, which utilizes all available observations, including information not available in real-time, to create a post-analysis six-hourly best track ^[4][5][1]. The historical record can be revised if warranted through this best-track review process ^[4][5][1]. A storm is counted as a hurricane when its final HURDAT2 status reaches 'HU', defined as hurricane intensity above 64 knots ^[6][4]. This intensity is based on the maximum 1-minute sustained surface wind at 10 meters, recorded in knots ^[6][4]. The count should represent distinct 2026 cyclone entries whose final post-analysis best track contains 'HU', rather than merely counting hurricane-strength observations or advisories ^[6][4].

NHC's post-analysis summary provides final operational confirmation. NOAA's operationally relevant final confirmation is provided by the NHC's post-analysis 2026 East Pacific season summary and HURDAT2 record ^[7][8][3][1]. It is important to note that a market's settlement date, such as December 1, may precede any later retrospective database revisions ^[7][8][3][1]. Therefore, if a subsequent reanalysis changes the classification of a borderline storm, the applicable record version or settlement rule should be checked ^[7][8][3][1].

Historical El Niño data supports NOAA's above-normal 2026 hurricane forecast. Past strong El Niño years, specifically 1997 and 2015, showed Eastern Pacific hurricane counts exceeding the 1991–2020 climatological average of 8 hurricanes ^[1][2]. In 1997, there were 9 hurricanes, and in 2015, there were 13, figures that align with NOAA's 2026 projected range of 9–14 hurricanes ^[2][1].

El Niño events consistently correlate with heightened Eastern Pacific hurricane activity. Strong El Niño occurrences, such as those in 1997–1998 and 2015–2016, have historically led to increased activity across the Pacific, particularly in the Eastern Pacific ^[3][4][2]. A peer-reviewed analysis further confirms a greater number of East Pacific tropical cyclones, including more storms reaching hurricane strength and higher intensity, during El Niño periods compared to La Niña ^[5]. The strong El Niño of 1991–1992 also produced 14 hurricanes and 8 major hurricanes, surpassing the 1991–2020 averages of 8 hurricanes and 4 major hurricanes ^[2].

NOAA's 2026 outlook considers multiple global atmospheric conditions. The agency's May 21, 2026 Eastern Pacific outlook assigns a 70% probability for an above-normal season, predicting 15–22 named storms, 9–14 hurricanes, and 5–9 major hurricanes ^[1]. While historical El Niño analogs are supportive, NOAA stresses that global ocean-atmosphere conditions are comprehensively evaluated, not solely El Niño. This approach is exemplified by 2015's active season, which also reflected unusually warm ocean temperatures beyond the tropics ^[2][3]. Market pricing in September indicated high odds for 6–7 hurricanes in 2026 but lower odds for 10 or more, generally supporting an active season though not necessarily NOAA's upper forecast range ^[6][7].

The Eastern Pacific hurricane season recorded 3 hurricanes by September 2, 2026, according to the NHC summary ^[1][2]. This count contrasts with NOAA's climatological baseline of 8 hurricanes per season, established from 1991–2020 data ^[3]. NOAA's May 21, 2026 outlook forecast 9–14 Eastern Pacific hurricanes, with a 70% probability for this range and a midpoint of 11.5 hurricanes ^[2][4][5]. This above-normal outlook was tied to expected strong, possibly very strong, El Ni c3

o conditions ^[2][5]. Expert commentary reports strong El Ni c3

o years average roughly 2–3 additional Eastern Pacific hurricanes compared to normal, with NOAA's seasonal ACE forecast at 120%–190% of median ^[2][5][3].

Prediction market evidence available through late August/early September indicated a record-like outcome was being priced, though models viewed the highest hurricane-count rungs as requiring an historically large late-season run ^[6]. Another report cited a 73% market price for more than 3 major hurricanes, not for the total hurricane count ^[6]. These are directional signals, not a reliable September 30 live quote ^[6]. The Eastern Pacific season officially runs May 15–November 30, with activity typically peaking in late August ^[6][3]. Prediction market contracts referenced in the analysis expire/settle December 1, 2026 ^[6]. By September 30, the primary remaining uncertainty is October–November formation, given the seasonal deadline of November 30 ^[6][3].

The base-case estimate for the final 2026 total is approximately 6 Eastern Pacific hurricanes, with a plausible range of 5–8 ^[1][2][6]. This analytical nowcast, not an official NOAA forecast, is based on NOAA's preseason distribution centered at 11.5 against the verified count of 3 by September 2, and a historical late-August analysis showing an average of 4.02 additional hurricanes after August 23 across 1971–2025 ^[1][2][6]. A bullish scenario envisions 7–9 or more hurricanes if El Ni c3

o remains unusually strong and October–November activity is sustained ^[6][5][3]. Conversely, a bearish scenario suggests 4–5 hurricanes if the late-season basin quiets and the observed pace remains below NOAA's high preseason midpoint ^[6][5][3]. The main market risk is that El Ni c3

o supports intensity/ACE without producing enough additional storms to reach upper hurricane-count brackets ^[6][5][3].